ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Weitere Quellen  (90)
  • Elsevier  (48)
  • Springer  (36)
  • GEOMAR Forschungszentrum für marine Geowissenschaften  (6)
  • American Meteorological Society
  • Institute of Physics
  • 1995-1999  (90)
  • 1990-1994
  • 1940-1944
  • 1996  (90)
  • 1
    facet.materialart.
    Unbekannt
    Analysis of Observed Chaotic Data (1996)
    Springer
    In:  Springer
    Details
    Publikationsdatum: 1996
    Schlagwort(e): Textbook of mathematics ; Data analysis / ~ processing ; Textbook of geophysics ; Chaotic behaviour
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    BIBLIOGRAFIE SEISMOLOGIE
  • 2
    facet.materialart.
    Unbekannt
    Structural Geology and Personal Computers (1996)
    Elsevier
    In:  New York, 546 pp., Elsevier, vol. 15, no. 85, pp. 585, (ISBN 0080424309)
    Details
    Publikationsdatum: 1996
    Beschreibung: This book will help structural geologists keep abreast of rapid changes in work practices resulting from the personal computer revolution. I Computer-Aided Learning; II Microstructural Analysis; III Analysis of Orientation Data; IV Strain and Kinematic Analysis; V Mathematical and Physical Modeling; VI Structural Mapping and GIS. ISBN: 0-08-043110-0
    Schlagwort(e): Structural geology ; software ; Textbook of geology ; Stress ; GIS ; Tectonics ; Geol. aspects ; Stress ; cracks and fractures (.NE. fracturing) ; Fracture
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    BIBLIOGRAFIE SEISMOLOGIE
  • 3
    facet.materialart.
    Unbekannt
    Contouring: A Guide to the Analysis and Display of Spatial Data (1996)
    Elsevier
    In:  New York, 340 pages, Elsevier, vol. 10, no. 1, pp. 1-40, (ISBN: 0-08-040286-0)
    Details
    Publikationsdatum: 1996
    Schlagwort(e): Textbook of informatics ; Textbook of geology ; Data analysis / ~ processing ; plotting
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    BIBLIOGRAFIE SEISMOLOGIE
  • 4
    facet.materialart.
    Unbekannt
    Linear-elastic crack models of jointing and faulting (1996)
    Elsevier
    In:  Professional Paper, Structural Geology and Personal Computers, New York, Elsevier, vol. 15, no. 16, pp. 359-388, (ISBN 1-86239-165-3, vi + 330 pp.)
    Details
    Publikationsdatum: 1996
    Schlagwort(e): cracks and fractures (.NE. fracturing) ; Fracture ; Elasticity ; Rock mechanics ; Mathematica ; MATLAB ; MAPLE ; Modelling ; J ; w/out ; dot
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    BIBLIOGRAFIE SEISMOLOGIE
  • 5
    facet.materialart.
    Unbekannt
    Thermal Modelling of Petroleum Generation: Theory and Applications (1996)
    Elsevier
    In:  Amsterdam, 526 pp., Elsevier, vol. 45, pp. ii + 37 pp. + 35 figs. + 4 tabs., (ISBN 975-561-182-7)
    Details
    Publikationsdatum: 1996
    Schlagwort(e): Applied geophysics ; Geol. aspects ; Borehole geophys. ; Geothermics ; Geochemistry
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    BIBLIOGRAFIE SEISMOLOGIE
  • 6
    facet.materialart.
    Unbekannt
    Monitoring and Mitigation of Volcano Hazards (1996)
    Springer
    In:  Berlin, Springer, vol. 20, no. Publ. No. 12, pp. 23-40, (ISBN 1-4020-3326-5, VIII + 343 pp.)
    Details
    Publikationsdatum: 1996
    Schlagwort(e): Volcanology ; Review article ; Earthquake hazard ; PAG
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    BIBLIOGRAFIE SEISMOLOGIE
  • 7
    facet.materialart.
    Unbekannt
    Physical Properties of Rocks: Fundamentals and Principals of Petrophysics (1996)
    Elsevier
    In:  Stuttgart, 403 pp., Elsevier, vol. 18, no. Publ. No. 12, pp. 267, (ISBN 3-534-14102-4)
    Details
    Publikationsdatum: 1996
    Schlagwort(e): Textbook of geophysics ; Physical properties of rocks ; porosity ; permeability ; conductivity ; Density ; susceptibility ; incompressibility ; shear ; modulus ; Lame ; viscosity ; Schoen ; Schon
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    BIBLIOGRAFIE SEISMOLOGIE
  • 8
    facet.materialart.
    Unbekannt
    The exchange of water between the South Indian and the South Atlantic (1996)
    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Heidelberg, pp. 125-162.
    Details
    Publikationsdatum: 2020-01-10
    Materialart: Book chapter , PeerReviewed
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 9
    facet.materialart.
    Unbekannt
    At-sea intercomparison of two newly designed underway pCO2 systems - Encouraging results (1996)
    Elsevier
    In:  Marine Chemistry, 52 . pp. 133-145.
    Details
    Publikationsdatum: 2017-08-18
    Beschreibung: Two newly designed underway systems for the measurement of CO2 partial pressure (pCO2) in seawater and the atmosphere are described. Results of an intercomparison experiment carried out in the North Sea are presented. A remarkable agreement between the two simultaneously measured (pCO2) data sets was observed even though the spatial variability in surface pCO2 was high. The average difference of all l -min averages of the seawater pCO2 was as low as 0.15 μatm with a standard deviation of 1.2 μatm indicating that no systematic difference is present. A closer examination of the profiles shows that differences tend to be highest during maxima of the pCO2 gradient (up to 14 μatm/min). The time constants of both systems were estimated from laboratory experiments to 45 s, respectively, 75 s thus quantitatively underlining their capability of a fast response to pCO2 changes
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 10
    facet.materialart.
    Unbekannt
    Late Eocene-Oligocene paleoceanography in the southern Indian Ocean (ODP Site 744) (1996)
    Elsevier
    In:  Marine Geology, 130 (1-2). pp. 99-119.
    Details
    Publikationsdatum: 2016-02-12
    Beschreibung: The late Eocene through Oligocene changes in the paleoceanography of the southernmost Indian Ocean have been reconstructed by means of a coarse fraction analysis of closely spaced samples (20 cm = about 20 kyr) from ODP Site 744, Kerguelen Plateau. Surface water productivity, reconstructed from accumulation rates of opal skeletons and benthic foraminifers is low in the early late Eocene, increases at about 36 Ma and shows a sharp increase to maximum values in the earliest Oligocene. In the early late Oligocene it decreases gradually to a minimum and increases again to a maximum in the latest Oligocene. Beside this general trend productivity varies in short-term cycles of a duration of about 400 kyr (340 kyr in the latest Oligocene) with maxima in productivity in warmer Oligocene periods. These productivity variations are reflected by strong variations in carbonate dissolution. Changes in bottom water mass chemistry have been deduced from the degree of carbonate dissolution and it's relation to productivity proxies. Following Kennett and Stott (1990), it is suggested that a proto-antarctic bottom water (proto-AABW) and an overlying warm, saline deep water (WSDW) from low latitudes shifted vertically and latitudinally with time and exerted their influence on the sediments of Site 744. Proto-AABW is detected by means of strong carbonate dissolution when productivity is low. WSDW is detected by means of an excellent carbonate preservation despite high productivity. Terrigenous material occurs as very coarse ice-rafted detritus (IRD) in the late Eocene (167–168.5 mbsf) and after a main shift in oxygen isotopes in the early Oligocene. Very low amounts of 40–125 μm sized mica and very few quartz grains occur only in high productivity periods and at the transition from low to high productivity periods. These occurrences are attributed to wind/current supply during warmer Oligocene intervals.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 11
    facet.materialart.
    Unbekannt
    Monitoring Termination II at high latitude: anomalies in the planktic foraminiferal record (1996)
    Elsevier
    In:  Marine Geology, 131 (1-2). pp. 89-102.
    Details
    Publikationsdatum: 2017-06-23
    Beschreibung: Microfaunal studies of planktic foraminifera carried out on 21 sediment cores from the Norwegian-Greenland Sea (NGS) reveal the spatial and lateral distribution as well as meltwater implication of today's non-polar/subpolar species Beella megastoma (Earland). Previous findings are verified in that this foraminifera is characteristic only of the deglaciation phases of Termination II, III, and VI and not the ensuing interglacial optima, thus, rendering this species a ‘meltwater’ indicator. Its distribution is restricted to cores from the central, i.e., more ‘pelagic’, part of the NGS covering an area as far north as 77 ° latitude. A detailed investigation of Termination II indicates that B. megastoma first appeared in the southwest of the NGS at ~131 ka and then about 6 kyr later in the eastern and northern parts of the NGS. For the entire duration B. megastoma always coincided with the deposition of distinct ice-rafted detritus (IRD) suggesting the presence of drifting icebergs during this period. Two different oceanographic models, each with a two-stepped evolution of the post-Saalian surface water circulation, are proposed to account for this time transgressive character. The mechanism of brine formation as possible oceanic phenomenon forcing Atlantic water northwards is suggested for being responsible for the occurrence of B. megastoma in the NGS during early Termination II. The presence of B. megastoma always ceased with the culmination of the interglacial optimum, oxygen isotopic Substage 5.51 (Eemian), when the subpolar foraminiferal fauna reached highest abundances and a general lack of IRD is observed.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 12
    facet.materialart.
    Unbekannt
    Linking physical property records of Quaternary sediments to Heinrich events (1996)
    Elsevier
    In:  Marine Geology, 131 (1-2). pp. 57-73.
    Details
    Publikationsdatum: 2017-06-23
    Beschreibung: Ice rafted debris in high latitude ocean sediments represent a complex record of the changing paleoenvironment of the oceans and, in particular, of the growth and decay of ice sheets along the margins of high latitudes. Physical properties measured on sediment cores taken from the Rockall Plateau were examined to determine the distribution of ice rafted debris layers and Heinrich events in the northeastern North Atlantic. These sediment core records may provide one of the keys to reconstruct the iceberg flow between the northeastern Atlantic and the Norwegian Sea. Magnetic susceptibility (MS) and Gamma Ray Attenuation Porosity Evaluator (GRAPE) density changes of these cores revealed that since about 65 ka, dropstone layers are recorded in both MS and GRAPE data of Rockall Plateau sediments. Rockall Plateau sediments show peaks in physical properties that correlate with Heinrich events (H1, H2, H4, H5, H6). Heinrich layer 3 was not observed. The stratigraphy and physical properties represent the Heinrich layers: H1 = 14–15 ka (MS = 52 μcgs, ϱ = 1.64 g/cm3), H2 = 23 ka (MS = 64 μcgs, ϱ = 1.8 g/cm3), H4 = 41 ka (MS = 53 μcgs, ϱ = 1.75 g/cm3), H5 = 50 ka (MS = 53 μcgs, ϱ = 1.75 g/cm3), H6 = 64 ka (MS = 100 μcgs, ϱ = 1.69 g/cm3). Heinrich events at Rockall Plateau sites point to a northward flow of icebergs in the northeastern Atlantic which may indicate a flow pattern to regions north of 54 °N.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 13
    facet.materialart.
    Unbekannt
    Geochemische und sedimentologische Untersuchungen über das Sedimentationsverhalten im Bereich biostratigraphischer Diskontinuitäten im Neogen des Nordatlantik, ODP Leg 104, Sites 642B und 643A (1996)
    GEOMAR Forschungszentrum für marine Geowissenschaften
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, 81 pp . GEOMAR-Report, 052 . DOI 10.3289/GEOMAR_REP_52_1996 〈http://dx.doi.org/10.3289/GEOMAR_REP_52_1996〉.
    Details
    Publikationsdatum: 2017-06-27
    Materialart: Thesis , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 14
    facet.materialart.
    Unbekannt
    Reply to comment of Lars Forsström on "Reflection of Scandinavian ice sheet fluctuations in Norwegian Sea Sediments during the Past 150,000 Years" by Karl-Heinz Baumann, Klas S. Lackschewitz, Jan Mangerud, Robert F. Spielhagen, Thomas C. W. Wolf-Welling, Rüdiger Henrich, and Heidemarie Kassens (1996)
    Elsevier
    In:  Quaternary Research, 46 . pp. 86-87.
    Details
    Publikationsdatum: 2019-01-23
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 15
    facet.materialart.
    Unbekannt
    Substrate pitting and boring pattern of Hyrrokkin sarcophaga Cedhagen, 1994 (Foraminifera) in a modern deep-water coral reef mound (1996)
    Elsevier
    In:  Marine Micropaleontology, 28 (2). pp. 199-207.
    Details
    Publikationsdatum: 2017-06-26
    Beschreibung: Colonization structures of the large parasitic foraminifer Hyrrokkin sarcophaga Cedhagen, 1994 on Lophelia pertusa, Acesta excavata and Delectopecten vitreus are described from a deep-water coral reef mound on the mid-Norwegian shelf at 240 to 300 m water depth. Hyrrokkin sarcophaga is the only epibiont which is capable of attaching itself on the soft tissue-protected coral skeleton where it tends to form clusters of 3 to 8 specimens close to the tentacles of Lophelia. The foraminifer excavates a pit up to 1.5 mm deep and etches a straight channel through the skeleton of the host which ends within the soft tissue. In contrast to Lophelia, infested bivalves show a strong wound repair reaction and seal the etched channels by intense calcification. The etching is only performed by adult specimens. Substrate pitting is considered to improve the attachment strength while boring enables the parasite to secure a persistent nutrient source.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 16
    facet.materialart.
    Unbekannt
    The geochemistry of ashes from Vesterisbanken Seamount, Greenland Basin: implications for the evolution of an alkaline volcano (1996)
    Elsevier
    In:  Journal of Volcanology and Geothermal Research, 70 (1-2). pp. 1-19.
    Details
    Publikationsdatum: 2017-08-08
    Beschreibung: Sediment cores containing up to twenty-five ash layers were taken at three sites close to Vesterisbanken Seamount in the Greenland Basin. These ash layers imply frequent eruptions of the volcano within the last 60 ka. The eruptions led to airborne transport and volcaniclastic turbidity flows which transported volcanic glassy and crystalline material from the volcano into the surrounding basin. During the eruption and the transport the glass and the crystal particles were mixed. The glasses range in composition between basanites and phonolites/benmoreites with MgO contents of 8 to 0.65%. The glass analyses follow a distinct trend of fractionation suggesting the crystallization of the phases olivine, clinopyroxene, plagioclase, kaersutite, Cr-spinel, Ti-magnetite and apatite. A strong zonation of clinopyroxene and kaersutite phenocrysts implies mixing processes in the magma system although the liquid compositions do not lie on mixing trends. A geochemical study of the bulk ashes shows that some ash layers possess distinct chemical compositions. The ashes are more evolved than the lavas of the volcano, suggesting fractionation of liquid from crystallized material during the eruption or transport of the ashes. Sixteen layers are statistically combined into four groups, of which several can be correlated from core to core reflecting individual eruptive events.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 17
    facet.materialart.
    Unbekannt
    Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment (1996)
    Springer
    In:  Geologische Rundschau, 85 (3). pp. 525-535.
    Details
    Publikationsdatum: 2019-01-22
    Beschreibung: Sediment samples from the Mid-Atlantic Reykjanes Ridge (59°N) were taken to get information about sediment genesis and to identify different sources during the late Quaternary. Samples were investigated by X-ray diffraction and grain-size analyses. The clay mineral assemblages in sediments of the Reykjanes Ridge reflect paleoceanographic changes during the late Quaternary. Holocene sediments are characterized by high contents of smectite, mainly of less developed crystallinity. In the spatial distribution of clay minerals high smectite concentrations on the eastern flank and slightly decreasing concentrations on the western flank of the Reykjanes Ridge indicate the action of bottom-water transport. The smectite originates mainly from the volcanogenous Icelandic shelf and reflects the influence of Iceland-Scotland Overflow Water (ISOW). Stratigraphic variability in the clay mineral composition reflects predominantly the influence of different sources, resulting from oceanographic and glacial transport processes. During glacial time sediment transport is due mainly to input by icebergs. Increasing amounts of illite, chlorite, and kaolinite characterize ice-rafted sediments of the “Heinrich layers”. In these sediments smectite crystallinity is well developed. In contrast, several other ice-rafted layers contain smectite with low crystallographic order, similar to smectites of Holocene age. The icelandic source was proved by distinct amounts of basaltic glass in the coarse-grained sediment. At approximately 55 ka increasing amounts of chlorite and kaolinite suggest an enhanced influx of warm North Atlantic surface waters. This hypothesis is supported by a high carbonate shell production at this time. Relative low concentrations and the well-developed crystallinity of smectite minerals characterize the Last Glacial Maximum (LGM; 18–16 ka), indicating a reduced supply of fine icelandic material. Shortly after the LGM, at the beginning of termination IA, a distinct increase in fine-grained quartz (〈2µm) and smectite are visible, which are proposed to reflect a supply of fine-grained ice-rafted material. At 13 ka linear increasing smectite concentrations of lower crystallographic order indicate increasing supply of fine-grained material from Iceland, linked to reinitiation of bottom currents of the ISOW. Full reinitiation is indicated at around 10 ka, where a strong increase in smectite of low crystallographic order is detected.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 18
    facet.materialart.
    Unbekannt
    Carbon isotope records from extant Caribbean and South Pacific sponges: Evolution of δ13C in surface water DIC (1996)
    Elsevier
    In:  Earth and Planetary Science Letters, 139 (1-2). pp. 291-303.
    Details
    Publikationsdatum: 2016-11-14
    Beschreibung: Stable isotope records of demosponges from the Caribbean and Coral Sea are described for the purpose of studying the influence of fossil fuel CO2 on the carbon isotopic composition of dissolved inorganic carbon (DIC) in surface water. The slow-growing sponges precipitate calcium carbonate in isotopic equilibrium with ambient sea water and are used to detect changes in δ13CDIC from pre-industrial times (early 19th century) to the present. We observed similar shapes and ranges in δ13C curves measured on Caribbean specimens collected from water depths of 25, 84 and 91 m as well as a specimen collected in shallow waters off New Caledonia. The records reveal a highly significant correlation with atmospheric δ13CCO2. δ13CDIC values for Caribbean and Coral Sea surface waters were calculated using the δ13C sponge records. While δ13C of atmospheric CO2 decreased by about 1.4‰ from the early 19th century to 1990, δ13CDIC of Caribbean and Coral Sea surface waters decreased by 0.9±0.2‰ and 0.7±0.3‰, respectively. No isotopic equilibrium between surface water DIC and atmospheric CO2 was observed, either during the pre-industrial steady state or during the last 100 years. The lower amount of depletion in the surface water δ13CDIC with respect to the atmospheric anthropogenic signal is explained by the dilution of the surface waters by biologically altered subsurface water DIC. The lower δ13C decrease in the Coral Sea points to a stronger influence of the subsurface water source compared to the Caribbean.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 19
    facet.materialart.
    Unbekannt
    Implications of stratigraphic and paleoclimatic records of the last interglaciation from the Nordic Seas (1996)
    Elsevier
    In:  Quaternary Research, 46 (3). pp. 260-269.
    Details
    Publikationsdatum: 2019-09-23
    Beschreibung: Climatic reconstruction of glacial to interglacial episodes from oxygen isotopes in sediment cores from the Nordic seas is complicated by strong local meltwater contributions to the oxygen isotope changes. Combination of benthic and planktic foraminiferal isotope data with foraminiferal abundances and ice-rafted debris (IRD) allows separation of local and global effects and subdivision of the marine oxygen isotope events 6.2–5.4, which include the last interglaciation, into: (1) a meltwater phase after glacial stage 6, recorded by large amounts of IRD and low foraminiferal abundance, indicating surface water warming; (2) an IRD-free period with high deposition rates of subpolar foraminifera and other CaCO3pelagic components, recognized here as the “full” interglaciation; and (3) a phase with the recurrence of IRD and the demise of subpolar species. Comparison of ice-core records and marine data implies that the global climate during the last full interglaciation and that during the postdeglacial Holocene were similar. The records show no significantly different variations in the proxy data. In contrast, the oxygen isotopes of planktic foraminifera and ice cores indicate significant differences during each of the deglacial transitions (Terminations I and II) that preceded these two interglaciations. These suggest that during Termination II the climatic evolution in the Nordic seas was less affected by abrupt changes in ocean–atmosphere circulation than during the last glacial to interglacial transition.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 20
    facet.materialart.
    Unbekannt
    Cold Seeps an konvergenten Plattenrändern vor Oregon und Peru: biogeochemische Bestandsaufnahme (1996)
    GEOMAR Forschungszentrum für marine Geowissenschaften
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, 148 pp . GEOMAR-Report, 053 . DOI 10.3289/GEOMAR_REP_53_1996 〈http://dx.doi.org/10.3289/GEOMAR_REP_53_1996〉.
    Details
    Publikationsdatum: 2015-07-20
    Materialart: Thesis , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 21
    facet.materialart.
    Unbekannt
    Late Eocene-Oligocene paleoceanography in the southern Indian Ocean (ODP Site 744) (1996)
    Elsevier
    In:  Marine Geology, 130 (1-2). pp. 99-119.
    Details
    Publikationsdatum: 2016-02-15
    Beschreibung: The late Eocene through Oligocene changes in the paleoceanography of the southernmost Indian Ocean have been reconstructed by means of a coarse fraction analysis of closely spaced samples (20 cm = about 20 kyr) from ODP Site 744, Kerguelen Plateau. Surface water productivity, reconstructed from accumulation rates of opal skeletons and benthic foraminifers is low in the early late Eocene, increases at about 36 Ma and shows a sharp increase to maximum values in the earliest Oligocene. In the early late Oligocene it decreases gradually to a minimum and increases again to a maximum in the latest Oligocene. Beside this general trend productivity varies in short-term cycles of a duration of about 400 kyr (340 kyr in the latest Oligocene) with maxima in productivity in warmer Oligocene periods. These productivity variations are reflected by strong variations in carbonate dissolution. Changes in bottom water mass chemistry have been deduced from the degree of carbonate dissolution and it's relation to productivity proxies. Following Kennett and Stott (1990), it is suggested that a proto-antarctic bottom water (proto-AABW) and an overlying warm, saline deep water (WSDW) from low latitudes shifted vertically and latitudinally with time and exerted their influence on the sediments of Site 744. Proto-AABW is detected by means of strong carbonate dissolution when productivity is low. WSDW is detected by means of an excellent carbonate preservation despite high productivity. Terrigenous material occurs as very coarse ice-rafted detritus (IRD) in the late Eocene (167–168.5 mbsf) and after a main shift in oxygen isotopes in the early Oligocene. Very low amounts of 40–125 μm sized mica and very few quartz grains occur only in high productivity periods and at the transition from low to high productivity periods. These occurrences are attributed to wind/current supply during warmer Oligocene intervals.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 22
    facet.materialart.
    Unbekannt
    The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690) (1996)
    Elsevier
    In:  Marine Geology, 131 (3-4). pp. 123-149.
    Details
    Publikationsdatum: 2016-01-29
    Beschreibung: High resolution interdisciplinary analyses of the clay and coarse (〉40 μm) fractions of ODP Leg 113 Site 690 Eocene-Oligocene sediments on the flank of the Maud Rise, provide information on paleoproductivity, water masses, paleoclimate and erosion in the Antarctic range as well as on the cyclicity of these processes. Three time intervals are distinguished: 1. (1) The middle Eocene, characterized by (a) nearly pure smectites, (b) productivity varying between relatively high values in the 42–44 Ma interval to very low values after 42 Ma, and (c) cyclic variations which correspond to changes in clay mineral associations. A warm saline deep water mass is inferred to have protected carbonate shells against dissolution at Site 690. We interpret the abundant mica in the coarse fraction as distributed by intermediate currents. 2. (2) The latest middle Eocene-late Eocene, characterized by low productivity values increasing with time. Kaolinite and illite concentrations also increase. Since the middle/late Eocene boundary mixing in the water column, which starts during a cooling event, causes similar clay mineral assemblages at Site 690 and at Site 689 on top of Maud Rise. 3. (3) The Oligocene, separated from the Eocene by a hiatus, is characterized by high productivity, highly increased amounts of illite and other minerals originating from erosion and physical weathering of Antarctica, and by cyclic variations of clay mineral indices which appear to be synchronous with productivity variations with a 400–450 kyr cyclicity. Six periods of strong carbonate dissolution associated with low productivity levels are attributed to incursions of cold carbonate aggressive bottom water of a “Proto-AABW” type.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 23
    facet.materialart.
    Unbekannt
    Seismic facies and specific character of the bottom simulating reflector on the western margin of Paramushir Island, Sea of Okhotsk (1996)
    Springer
    In:  Geo-Marine Letters, 16 (4). pp. 297-304.
    Details
    Publikationsdatum: 2017-05-22
    Beschreibung: Seismic profiles from a venting area on the western margin of Paramushir Island (Sea of Okhotsk) reveal a local complex structure and an interesting, unusual pattern of the bottom simulating reflector (BSR). The BSR is gradual rising towards the venting area. The geothermal gradient and the bottom temperature confirmed the methane hydrate. The temperature appears to be the most important factor controlling the hydrate stability. A locally higher heat flow caused the upward migration of the hydrate stability field and the subsequent degradation of the hydrated sediments, causing gas vent formation and the flux of methane gas into the water column.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 24
    facet.materialart.
    Unbekannt
    Evolution of parental magmas of Miocene shield basalts of Gran Canaria (Canary Islands): constraints from crystal, melt and fluid inclusions in minerals (1996)
    Springer
    In:  Contributions to Mineralogy and Petrology, 124 (3-4). pp. 422-435.
    Details
    Publikationsdatum: 2016-09-21
    Beschreibung: Picritic units of the Miocene shield volcanics on Gran Canaria, Canary Islands, contain olivine and clinopyroxene phenocrysts with abundant primary melt, crystal and fluid inclusions. Composition and crystallization conditions of primary magmas in equilibrium with olivine Fo90-92 were inferred from high-temperature microthermometric quench experiments, low-temperature microthermometry of fluid inclusions and simulation of the reverse path of olivine fractional crystallization based on major element composition of melt inclusions. Primary magmas parental for the Miocene shield basalts range from transitional to alkaline picrites (14.7–19.3 wt% MgO, 43.2–45.7 wt% SiO2). Crystallization of these primary magmas is believed to have occurred over the temperature range 1490–1150° C at pressures ≈5 kbar producing olivine of Fo80.6-90.2, high-Ti chrome spinel [Mg/ (Mg+Fe2+)=0.32–0.56, Cr/(Cr+Al)=0.50–0.78, 2.52–8.58 wt% TiO2], and clinopyroxene [Mg/(Mg+Fe)=0.79–0.88, Wo44.1-45.3, En43.9-48.0, Fs6.8-11.0] which appeared on the liquidus together with olivine≈Fo86. Redox conditions evolved from intermediate between the QFM and WM buffers to late-stage conditions of NNO+1 to NNO+2. The primary magmas crystallized in the presence of an essentially pure CO2 fluid. The primary magmas originated at pressures 〉30 kbar and temperatures of 1500–1600° C, assuming equilibrium with mantle peridotite. This implies melting of the mantle source at a depth of ≈100 km within the garnet stability field followed by migration of melts into magma reservoirs located at the boundary between the upper mantle and lower crust. The temperatures and pressures of primary magma generation suggest that the Canarian plume originated in the lower mantle at depth ≈900 km that supports the plume concept of origin of the Canary Islands.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 25
    facet.materialart.
    Unbekannt
    Northern Europe climate variations during late Holocene: evidence from marine Skagerrak (1996)
    Elsevier
    In:  Palaeogeography, Palaeoclimatology, Palaeoecology, 123 (1-4). pp. 121-145.
    Details
    Publikationsdatum: 2016-02-04
    Beschreibung: Granulometric and stable oxygen isotope analyses of four sediment cores from two high accumulation areas in the Skagerrak (NE North Sea) were carried out in order to reconstruct climate fluctuations and to evaluate climate impact during the upper Holocene. Extremely high sedimentation rates, especially in the eastern Skagerrak, are explained by increased current activity which is responsible for the transport and deposition of high quantities of suspension load during periods of stormy zonal atmospheric circulation patterns. These were most frequent during colder periods, while warmer phases are characterized by calmer meridional to zonal atmospheric circulation patterns. While the Subatlantic climate deterioration and the Subboreal climate optimum left only indistinct traces in the sediments, the Roman climate optimum and a colder period between ca. 400 and 700 AD are well documented. The following Medieval Warm period is characterized by a clear temperature increase of the waterbody in connection with less frequent advances of Atlantic water masses into the Skagerak deep and a decrease in bottom current strength. A mode of sedimentation prevails, similar to that of recent summer conditions, suggesting short and mild winters during that period. The onset of the Little Ice Age (around 1350 AD), however, shows an intensified bottom current circulation most probably due to amplifying westerly winds and a decrease in water temperatures in connection with more frequent advances of higher saline Atlantic waters. The Little Ice Age can be divided into 3 phases: a stormy “zonal” onset, a calm “meridional” maximum and a stormy “zonal” end. The stormy phases are characterized by a sedimentation mode similar to that of recent winter conditions while the Little Ice Age Maximum shows conditions comparable to exceptional cold modern winters. From 1900 AD, at the onset of the Modern Climate Optimum, the winter type sedimentation decreases and conditions change again to a level comparable to the Medieval Warm Period.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 26
    facet.materialart.
    Unbekannt
    Tectonics and climate (1996)
    Springer
    In:  Geologische Rundschau, 85 (3). pp. 409-437.
    Details
    Publikationsdatum: 2019-01-22
    Beschreibung: Tectonics and climate are both directly and indirectly related. The direct connection is between uplift, atmospheric circulation, and the hydrologic cycle. The indirect links are via subduction, volcanism, the introduction of gasses into the atmosphere, and through erosion and consumption of atmospheric gases by chemical weathering. Rifting of continental blocks involves broad upwarping followed by subsidence of a central valley and uplift of marginal shoulders. The result is an evolving regional climate which has been repeated many times in the Phanerozoic: first a vapor-trapping arch, followed by a rift valley with fresh-water lakes, culminating in an arid rift bordered by mountains intercepting incoming precipitation. Convergence tectonics affects climate on a larger scale. A mountain range is a barrier to atmospheric circulation, especially if perpendicular to the circulation. It also traps water vapor converting latent to sensible heat. Broad uplift results in a shorter path for both incoming and outgoing radiation resulting in seasonal climate extremes with reversals of atmospheric pressure and enhanced monsoonal circulation. Volcanism affects climate by introducing ash and aerosols into the atmosphere, but unless these are injected into the stratosphere, they have little effect. Stratospheric injection is most likely to occur at high latitudes, where the thickness of the troposphere is minimal. Volcanoes introduce CO2, a greenhouse gas, into the atmosphere. Geochemical effects of tectonic uplift and unroofing relate to the weathering of silicate rocks, the means by which CO2 is removed from the atmosphere-ocean system on long-term time scales.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 27
    facet.materialart.
    Unbekannt
    Comparison of XCTD/CTD data (1996)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 43 (6). pp. 859-876.
    Details
    Publikationsdatum: 2016-09-30
    Beschreibung: XCTD (eXpendable Conductivity Temperature Depth) probes, developed recently by SIPPICAN Inc., have been used simultaneously with a CTD sonde in order to test, in the field, their performance and accuracy (interpreted as ±2 standard deviations of the XCTD-CTD differences). We have taken advantage, during the THETIS-I experiment in March 1992, of both the homogeneous and the stratified areas encountered in winter in the northern part of the western Mediterranean Sea to differentiate the errors due to the experimental conditions from those effectively due to the sensors. Although some intrinsic problems are evident, so that only seven out of the nine probes considered for comparison are usable, the accuracy specified by the manufacturer for the temperature (AT = ± 0.03°C) is reached after standard processing, while the accuracies in conductivity, salinity and potential density are AC ≈ ± 0.06 mS/cm (the specified value is AC = ± 0.03 mS/cm), AS ≈ ± 0.04 and Aσθ ≈ ±3 kg/m3. However, when the experimental errors (in situ natural variability, relatively rough estimation of the XCTD depth) are considered, it appears that the effective accuracies of the XCTD sensors are better than ± 0.02°C and ± 0.04 mS/cm, that is to say better than and close to the specified values of ± 0.03°C and ± 0.03 mS/cm. Occasional offsets in conductivity can further be well corrected for by using a temperature-salinity relation in some limited depth range and area where this relation is known to hold well; the conductivity-sensor accuracy then significantly improves to AC≈ ± 0.02 mS/cm resulting, for our study area, in corresponding salinity and potential density accuracies of AS≈ ± 0.03 and Aσθ ≈ ± 0.02 kg/m3. Thus, such instruments promise to be useful tools for many experimental studies. Complementary comparisons, performed with new versions of the XCTD probes under less convenient experimental conditions, are also presented
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 28
    facet.materialart.
    Unbekannt
    The Deep Water Regime in the Equatorial Atlantic (1996)
    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Heidelberg, pp. 261-271. ISBN 3-540-62079-6
    Details
    Publikationsdatum: 2020-04-02
    Materialart: Book chapter , NonPeerReviewed
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 29
    facet.materialart.
    Unbekannt
    Sea-Level Changes and δ18O Record for the Past 34,000 yr from Mayotte Reef, Indian Ocean (1996)
    Elsevier
    In:  Quaternary Research, 46 (3). pp. 335-339.
    Details
    Publikationsdatum: 2017-07-06
    Beschreibung: New sea-level and δ18O curves for the past 34,000 yr, based on uranium–thorium chronology, are proposed for the southwestern part of the Indian Ocean. The archives include cores drilled from onshore coral reefs and submersed samples from foreslope corals of Mayotte in the Comoro Islands. The Mayotte sea-level curve shows a lowstand of 145 ± 5 m below the present level during the last glacial maximum dated at 18,400 yr. This lowstand is supported by the maximum18O enrichment in the coral colonies. The residual signal (Δδ18O), controlled by sea-surface temperature changes, indicates that surface waters 18,400 yr ago were approximately 5°C cooler than present. The deglacial sea-level rise is clearly recorded, with a mean rate of about 1.7 cm yr−1between 18,400 and 10,000 yr ago. The deglaciation phase is characterized by a strong18O depletion marked by two pulses related to meltwater discharges into the North Atlantic Ocean but also characterized by responses specific to the tropical Indian Ocean.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 30
    facet.materialart.
    Unbekannt
    An in-situ filtration/extraction system for the recovery of trace organics in solution and on particles tested in deep ocean water (1996)
    Elsevier
    In:  Marine Chemistry, 54 . pp. 97-105.
    Details
    Publikationsdatum: 2017-08-18
    Beschreibung: A system for in-situ filtration and extraction of organics in natural waters has been developed and tested down to 4000 m in the Atlantic Ocean. Up to 2000 dm3 water can be filtered and extracted at low suspended matter concentrations. The sampling equipment has new features for the analysis of trace organic compounds: contamination is extremely low, this can be checked and cured, if necessary, and water flow can be selected and maintained at a constant rate. Various resins can be applied, with different optimum flow rates for the efficient extraction of the compounds of interest. The properties of the resin (here XAD-2) do not change with depth. The operation of the unit is controlled by menu-driven software. All relevant data are stored for later evaluation. Tests in the deep Atlantic resulted in total procedural blanks, including sampling, as low as 0/003 pg dm−3 for individual chlorobiphenyls (CBs), HCB and DDE and 0.5 pg dm−3 for individual PAHs. Actual dissolved concentrations were in the range 0.005–0.1 pg dm−3 for CBs, HCB and DDE and 0.5–140 pg dm−3 for PAHs.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 31
    facet.materialart.
    Unbekannt
    The phylogenetic relationship among Ectothiorhodospiraceae. A reevaluation of their taxonomy on the basis of 16S rDNA analyses (1996)
    Elsevier
    In:  Systematic and Applied Microbiology (165). pp. 106-113.
    Details
    Publikationsdatum: 2016-06-17
    Beschreibung: Sequences of the 16S rRNA gene were determined from all type strains of the recognized Ectothiorhodospira species and from a number of additional strains. For the first time, these data resolve the phylogenetic relationships of the Ectothiorhodospiraceae in detail, confirm the established species, and improve the classification of strains of uncertain affiliation. Two major groups that are recognized as separate genera were clearly established. The extremely halophilic species were removed from the genus Ectothiorhodospira and reassigned to the new genus Halorhodospira gen. nov., to recognize that the most halophilic eubacteria are species of this genus. These species are Halorhodospira halophila comb. nov., Halorhodospira halochloris comb. nov., and Halorhodospira abdelmalekii comb. nov. Among the slightly halophilic Ectothiorhodospira species, the classification of strains belonging to Ectothiorhodospira mobilis and Ectothiorhodospira shaposhnikovii was improved. Several strains that were tentatively identified as Ectothiorhodospira mobilis form a separate cluster on the basis of their 16S rDNA sequences and are recognized as two new species: Ectothiorhodospira haloalkaliphila sp. nov., which includes the most alkaliphilic strains originating from strongly alkaline soda lakes, and Ectothiorhodospira marina, describing isolates from the marine environment.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 32
    facet.materialart.
    Unbekannt
    Late Quaternary sediment dating and quantification of lateral sediment redistribution applying 230Thex: A study from the eastern Atlantic sector of the Southern Ocean (1996)
    Springer
    In:  Geologische Rundschau, 85 . pp. 554-566.
    Details
    Publikationsdatum: 2020-07-30
    Beschreibung: High-resolution records of the natural radionuclide230Th were measured in sediments from the eastern Atlantic sector of the Antarctic circumpolar current to obtain a detailed reconstruction of the sedimentation history of this key area for global climate change during the late Quaternary. High-resolution dating rests on the assumption that the230Thex flux to the sediments is constant. Short periods of drastically increased sediment accumulation rates (up to a factor of 8) were determined in the sediments of the Antarctic zone during the climate optima at the beginning of the Holocene and the isotope stage 5e. By comparing expected and measured accumulation rate of230Thex, lateral sediment redistribution was quantified and vertical particle rain rates originating from the surface water above were calculated. We show that lateral contributions locally were up to 6.5 times higher than the vertical particle rain rates. At other locations only 15% of the expected vertical particle rain rate were deposited.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 33
    facet.materialart.
    Unbekannt
    Composition and biomass of plankton in spring on the Cape Hatteras shelf, with implications for carbon flux (1996)
    Elsevier
    In:  Continental Shelf Research, 16 (8). pp. 1087-1116.
    Details
    Publikationsdatum: 2016-09-20
    Beschreibung: The Ocean Margins Program, an interdisciplinary study focussed at Cape Hatteras, is evaluating whether this region is a net source or sink for carbon, while concurrently developing a mechanistic understanding of the production, cycling and fate of organic carbon. Preliminary to a large multi-ship field program in 1996–1997, the first of several short cruises surveyed Cape Hatteras in May 1993. High concentrations of chla occurred across the shelf. Stations and depths at which chla was highest also showed elevated concentrations of large phytoplankton, predominantly chained diatoms, but also single-celled dinoflagellates and obligately photosynthetic ciliates. These populations occurred in deeper waters, however, and their abundance was poorly correlated with proxies of community photosynthesis. Instead, small phototrophic nanoplankton, abundant in surface waters, were positively correlated with primary production. Carbon budgets indicated that inner shelf waters containedca 50% more living POC than outer shelf waters. The relative importance of large phytoplankton and grazers decreased with distance offshore, and they were replaced by photosynthetic nanoplankton and microzooplankton. Even greater changes in living POC occurred in the alongshore direction due to the dramatic reductions in diatoms in southern waters. Estimated herbivory wasca 2–4 gC m−2 d−1. The ratio of heterotrophic : autotrophic POC increased from 38% in northern waters to 137% in southern waters, suggesting that phytoplankton was being converted into consumer carbon as shelf waters advected south. The dominant consumers at most stations were single-celled protozoan zooplankton and small copepods, whose fecal products remain in suspension in energetic shelf environments, suggesting that much of the non-diatomaceous POC was exported as shelf waters exited at Cape Hatteras.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 34
    facet.materialart.
    Unbekannt
    South Atlantic heat transport at 11°S (1996)
    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Heidelberg, pp. 105-120. ISBN 3-540-62079-6
    Details
    Publikationsdatum: 2020-04-03
    Beschreibung: Hydrographic data along 11°S occupied in 1983 by the R.V. OCEANUS are used together with various wind climatologies to estimate the annual average transport of heat at this latitude. Some motivation for expecting fairly well-defined estimates at this latitude compared to others comes from the absence of a strong western boundary current. Results include flow in four layers representing the thermocline, Antarctic Intermediate Water, North Atlantic Deep Water, and Antarctic Bottom Water, using zero velocity reference level choices based on property distributions. The annual average heat transport is estimated to be 0.6 ± 0.17 x 1015 W. Previous estimates of the transport at 8–16°S range from 0.2 PW to greater than 1 PW. Interannual variability from the wind field alone leads to interannual heat transport variability of about 0.05 PW. Comparisons with other recent studies at 45–30°S and 11°N are made.
    Materialart: Book chapter , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 35
    facet.materialart.
    Unbekannt
    The zonal WOCE sections in the South Atlantic (1996)
    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Germany, pp. 83-104. ISBN 3-540-62079-6
    Details
    Publikationsdatum: 2019-09-03
    Beschreibung: The data from six zonal sections in the World Ocean Circulation Experiment (WOCE) in the tropical and southem Atlantic are used to describe the distribution of water masses. Due to the high spatial resolution, the structure oftemperature, salinity, oxygen, silicate and nitrate displays details related to transport and mixing in this region. Temperature-salinity diagrams are also presented which indicate the effects ofbranching and recirculation loops in the water mass flow.
    Materialart: Book chapter , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 36
    facet.materialart.
    Unbekannt
    Differentiation of Ectothiorhodospiraceae based on their fatty acid composition (1996)
    Elsevier
    In:  Systematic and Applied Microbiology, 19 (2). pp. 223-230.
    Details
    Publikationsdatum: 2019-01-24
    Beschreibung: The fatty acid composition of 27 strains from 7 described Ectothiorhodospira species, including all type strains, were analyzed and compared using the “Microbial Identification System”. According to their ability to grow in media with 15% total salts and more or to require much lower salt concentrations the comparison of the strains was made in two different groups. The strains grown in the established standard medium for Ectothiorhodospira species at 15% and 25% (w/v) salinity formed four major clusters. Two of these enclosed strains of E. halophila, the others E. abdelmalekii (one strain) and E. halochloris (3 strains), respectively. Those strains with salt optima significantly below 10% (w/v) salinity formed three major clusters. The first included strains of E. mobilis and E. marismortui. The second cluster contained strains of E. shaposhnikovii, E. vacuolata and one strain that had been tentatively identified as E. mobilis but should be considered as a strain of E. shaposhnikovii. The third group contained strains that were assigned to E. mobilis but should be regarded as a separate and new species. The observed similarities support and extend patterns of relationships obtained by other taxonomic investigations on the basis of a smaller number of strains.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 37
    facet.materialart.
    Unbekannt
    The Influence of the Agulhas Current on the Adjacent Coastal Ocean: Possible Impacts of Climate Change (1996)
    Elsevier
    In:  Journal of Marine Systems, 7 . pp. 321-336.
    Details
    Publikationsdatum: 2017-06-26
    Beschreibung: The dynamics of the coastal ocean along the southeastern coast of Africa is dominated by a strong and intense western boundary current, the Agulhas Current. With a near-uniform, narrow continental shelf and a steep shelf slope that stabilizes this current, the trajectory of the Agulhas exhibits great stability. The only substantial perturbation occurs with the irregular passage of a Natal Pulse, a soliton meander. The initiation of this meander at the Natal Bight is due to a barotropic instability when the intensity of the landward border of the current exceeds a certain threshold value. This may come about with natural fluctuations in the current or with the adsorption of deep-sea eddies onto the current. Under a climate change scenario of altered wind stress curl over the South Indian Ocean it is conceivable that the threshold for the triggering of a Natal Pulse will occur more frequently. This will lead to a situation where the current axis on average lies further offshore. The possible consequences of such a situation on the rainfall of the coast, on the ecology of estuaries and the coastal ocean, and on the socio-economics of the region is discussed.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 38
    facet.materialart.
    Unbekannt
    Air-sea fluxes: 25 years of progress (1996)
    Springer
    In:  Boundary-Layer Meteorology, 78 . pp. 247-290.
    Details
    Publikationsdatum: 2016-09-06
    Beschreibung: During the past quarter century the study of air-sea interaction has evolved from a small branch of marine climatology to play a key role in the modelling of the coupled system of ocean and atmosphere. Knowledge of air- sea fluxes has grown, based on Monin-Obukhov similarity theory for surface boundary layers and on direct and indirect techniques of measuring the fluxes. This has been the basis for providing boundary conditions needed to couple atmospheric and oceanic circulation models that are used to forecast weather and climate. An overview of current understanding is followed by a discussion of parameterisation schemes and a chronicle of some of the experimental work that has tested theories and quantified their conclusions.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 39
    facet.materialart.
    Unbekannt
    Assessing the reliability of magnesium in foraminiferal calcite as a proxy for water mass temperatures (1996)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 60 (5). pp. 803-814.
    Details
    Publikationsdatum: 2017-09-26
    Beschreibung: Though many studies on the Mg contents in the calcitic tests of foraminifers exist, the processes controlling its uptake are still a matter of debate. Laboratory cultures offer an excellent opportunity to reveal these mechanisms. The Mg concentrations within single chambers of the planktic foraminifer Globigerinoides sacculifer (BRADY) maintained under controlled laboratory conditions were measured (1) at variable temperatures (19.5–29.5 °C) and constant salinity and (2) at variable salinity (22–45‰) and constant temperature. The experimental results suggest that under natural conditions, temperature is the leading mechanism controlling the Mg/Ca ratio. Temperature and magnesium are related proportionally. A temperature increase of ca. 10 °C gives rise to an increase of the magnesium concentrations of ca. 130%. Drastic (unnatural) salinity changes dominate the effects of temperature. A 110% change in the Mg/Ca ratio was observed when salinity was elevated or reduced by more than ca. 10‰. Specimens which underwent gametogenesis reveal significantly higher Mg concentrations than specimens that did not release gametes. Partition coefficients for Mg in foraminiferal calcite are orders of magnitude lower than values from inorganically precipitated calcite. When comparing observed Mg/Ca ratios of foraminiferal tests with predicted Mg/Ca ratios calculated according to empirical equations, it becomes evident that foraminiferal tests are undersaturated with respect to Mg for the water temperature they have experienced. Apparently, foraminifers are capable of controlling their Mg concentration. The physiological processes presumably responsible for such depressed Mg/Ca ratios appear to be temperature-controlled as deduced from the close relationship of the observed Mg/Ca ratios and water temperature. This study demonstrates that variations in temperature and salinity are definitely reflected in the Mg content of foraminiferal tests. Magnesium may thus serve as a paleo-proxy for past surface water temperatures, as long as postdepositional changes and salinity variations are of subordinate importance or can be excluded.
    Materialart: Article , PeerReviewed
    Format: text
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 40
    facet.materialart.
    Unbekannt
    On Bathymetry of the Hunter Channel (1996)
    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Germany, pp. 355-361.
    Details
    Publikationsdatum: 2013-01-15
    Materialart: Book chapter , NonPeerReviewed
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 41
    facet.materialart.
    Unbekannt
    Circulation in the Deep Brazil Basin (1996)
    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Germany, pp. 249-260.
    Details
    Publikationsdatum: 2019-09-12
    Beschreibung: The Deep Basin Experiment (DBE), a part of the World Ocean Circulation Experiment (WOCE), is presently underway in the Brazil Basin of the South Atlantic. The program objectives and design philosophy are reviewed and early results are presented. Observations from a moored array along the southern boundary and neutrally buoyant float trajectories in the North Atlantic Deep Water and Antarctic Bottom Water are described with emphasis on their relationship to the recent flow schemes offered by Reid (1989). Also discussed are the process of cross isotherm mixing within the intense flow regime of the Verna Channel and observations of long period warming of the bottom water.
    Materialart: Book chapter , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 42
    facet.materialart.
    Unbekannt
    Plankton ecology: The past two decades of progress (1996)
    Springer
    In:  Naturwissenschaften, 83 (7). pp. 293-301.
    Details
    Publikationsdatum: 2017-03-07
    Beschreibung: This is a selected account of recent developments in plankton ecology. The examples have been chosen for their degree of innovation during the past two decades and for their general ecological importance. They range from plankton autecology over interactions between populations to community ecology. The autecology of plankton is represented by the hydromechanics of plankton (the problem of life in a viscous environment) and by the nutritional ecology of phyto- and zooplankton. Population level studies are represented by competition, herbivory (grazing), and zooplankton responses to predation. Community ecology is represented by the debate about bottom- up vs. top-down control of community organization, by the PEG model of seasonal plankton succession, and by the recent discovery of the microbial food web.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 43
    facet.materialart.
    Unbekannt
    ENSO-controlled flooding in the Parana River (1904-1991) (1996)
    Springer
    In:  Naturwissenschaften, 83 (3). pp. 127-129.
    Details
    Publikationsdatum: 2017-03-07
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 44
    facet.materialart.
    Unbekannt
    A mechanism for decadal climate variability (1996)
    Springer
    In:  In: Decadal Climate Variability: Dynamics and Predictability. , ed. by Anderson, D. L. T. and Willebrand, J. NATO ASI Series I: Global Environmental Change, 44 . Springer, Berlin, Germany, pp. 263-292, 43 pp. ISBN 3-540-61459-1
    Details
    Publikationsdatum: 2019-08-08
    Materialart: Book chapter , NonPeerReviewed
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 45
    facet.materialart.
    Unbekannt
    The Last Interglacial Sea Level - New Evidences from the Abrolhos Islands, West Australia (1996)
    Springer
    In:  Geologische Rundschau, 85 . pp. 606-614.
    Details
    Publikationsdatum: 2018-03-21
    Beschreibung: U-series ages measured by thermal ionisation mass spectrometry (TIMS) are reported for a Last Interglacial (LI) fossil coral core from the Turtle Bay, Houtman Abrolhos islands, western Australia. The core is 33.4 m long the top of which is approximately 5 m a.p.s.l. (above present sea level). From the232Th concentrations and the reliability of the U-series ages, two sections in the core can be distinguished. Calculated U/Th ages in core section I (3.3 m a.p.s.l to 11 m b.p.s.l) vary between 124±1.7 ka BP (3.3 m a.p.s.l.) and 132.5±1.8 ka (4 m b.p.s.l., i.e. below present sea level), and those of section II (11–23 m b.p.s.l.) between 140±3 and 214±5 ka BP, respectively. The ages of core section I are in almost perfect chronological order, whereas for section II no clear age-depth relationship of the samples can be recognised. Further assessments based on the ϖ234U(T) criteria reveal that none of the samples of core section II give reliable ages, whereas for core section I several samples can be considered to be moderately reliable within 2 ka. The data of the Turtle Bay core complement and extend our previous work from the Houtman Abrolhos showing that the sea level reached a height of approximately 4 m b.p.s.l at approximately 134 ka BP and a sea level highstand of at least 3.3 m a.p.s.l. at approximately 124 ka BP. Sea level dropped below its present position at approximately 116 ka BP. Although the new data are in general accord with the Milankovitch theory of climate change, a detailed comparison reveals considerable differences between the Holocene and LI sea level rise as monitored relative to the Houtman Abrolhos islands. These observation apparently add further evidence to the growing set of data that the LI sea level rise started earlier than recognised by SPECMAP chronology. A reconciliation of these contradictionary observations following the line of arguments presented by Crowley (1994) are discussed with respect to the Milankovitch theory.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 46
    facet.materialart.
    Unbekannt
    Production of Secondary Metabolites by Solid-State Fermentation (1996)
    Elsevier
    In:  Biotechnology Annual Review, 2 . pp. 85-121.
    Details
    Publikationsdatum: 2016-08-30
    Beschreibung: Microbial secondary metabolites are useful high value products that are normally produced by liquid culture; but could be advantageously produced by solid-state fermentation (SSF). Particularly if SSF could benefit from a deeper understanding of microbial physiology in a solid environment. Recent research indicates that different kind of secondary metabolites can be produced by SSF: antibiotics, phytohormones, food grade pigments, alkaloids, etc. Physiology in SSF shows several similarities with physiology in liquid medium, so similar strategies must be adapted for efficient processes. However, there are certain particularities of idiophase in solid medium which dictate the need for special strains.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 47
    facet.materialart.
    Unbekannt
    Production of secondary metabolites by solid-state fermentation (1996)
    Elsevier
    In:  Biotechnology Annual Review, 2 . pp. 85-121.
    Details
    Publikationsdatum: 2020-06-22
    Beschreibung: Microbial secondary metabolites are useful high value products that are normally produced by liquid culture; but could be advantageously produced by solid-state fermentation (SSF). Particularly if SSF could benefit from a deeper understanding of microbial physiology in a solid environment. Recent research indicates that different kind of secondary metabolites can be produced by SSF: antibiotics, phytohormones, food grade pigments, alkaloids, etc. Physiology in SSF shows several similarities with physiology in liquid medium, so similar strategies must be adapted for efficient processes. However, there are certain particularities of idiophase in solid medium which dictate the need for special strains.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 48
    facet.materialart.
    Unbekannt
    Deep water masses and transports in the Vema Fracture Zone (1996)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 43 (7). pp. 1067-1074.
    Details
    Publikationsdatum: 2019-09-23
    Beschreibung: Recent results from hydrographic, chlorofluoromethane (CFM) and current measurements during an R.V. Meteor cruise in February/March 1994 underscore the importance of the Vema Fracture Zone (VFZ), located near 11°N on the Mid-Atlantic Ridge, for the transport of bottom water from the deep western basin of the equatorial Atlantic into the eastern abyss. The eastward transport in the bottom water range, of 1.8-2.0 Sv below 2.0°C, and of 2.1–2.4 Sv below the level of no motion at 3640 m, was determined by a combination of geostrophic calculations and direct current observations by a lowered ADCP. The comparison to former results indicates that the eastward flow in the VFZ is rather persistent. The water mass properties (Θ, S and CFMs) in the VFZ were compared to stations in the Guiana Basin, in the equatorial channel, and in the Brazil Basin at 10°S suggesting a significant contribution of North Atlantic Deep Water to the entire bottom water layer in the VFZ.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 49
    facet.materialart.
    Unbekannt
    The South Atlantic: Present and Past Circulation (1996)
    Springer
    In:  Springer, Berlin, Germany, 644 pp. ISBN 3-540-62079-6
    Details
    Publikationsdatum: 2020-03-25
    Materialart: Book , PeerReviewed
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 50
    facet.materialart.
    Unbekannt
    Atmospheric water vapour and cloud water: An overview (1996)
    Elsevier
    In:  Advances in Space Research, 18 (7). pp. 5-16.
    Details
    Publikationsdatum: 2017-12-11
    Beschreibung: Hydro-meteorological parameters i.e. precipitable water, cloud water and ice content, and precipitation are most variable parameters in the atmosphere. This is the main reason why representative direct measurements of these properties are hardly available. Remote sensing with satellite-borne instruments in particular in the microwave spectral range is a way out of this dilemma. A number of algorithms has been developed. The different methods how to proceed in the development of such algorithms are discussed. Verification of the retrieved products in particular the liquid water path is a great problem, a few ideas will be discussed. Results will be shown for the total precipitable water W and liquid water path LWP over the Atlantic Ocean for different time scales. The structure of the W field is very similar for the same month in different years. But LWP is very variable, even for monthly means (October 1987 and 1989) the differences can be larger than 0.1 kg/m2.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 51
    facet.materialart.
    Unbekannt
    Automated monitoring of Ni, Cu and Zn in the Irish Sea (1996)
    Elsevier
    In:  Marine Pollution Bulletin, 32 (6). pp. 471-479.
    Details
    Publikationsdatum: 2014-02-03
    Beschreibung: The distributions of Ni, Cu and Zn have been monitored in the Irish Sea using fully automated voltammetric instrumentation and collection of seawater by underway pumping. The continuous real-time measurements provided high resolution data with a minimum risk of sample contamination. The surveys showed that the River Mersey was a significant contributor of Ni, Cu and Zn to the eastern Irish Sea and that the trace metal distribution was consistent with an anti-clockwise residual water movement in the eastern Irish Sea. The automated instrumentation is very useful for monitoring requirements for environmental impact assessments and can provide high resolution trace metal data for marine modelling purposes.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 52
    facet.materialart.
    Unbekannt
    Modifikation des bodennahen Strömungsregimes und die Deposition von suspendiertem Material durch Makrofauna (1996)
    GEOMAR Forschungszentrum für marine Geowissenschaften
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, 121 pp . GEOMAR-Report, 074 . DOI 10.3289/geomar_rep_74_1999 〈http://dx.doi.org/10.3289/geomar_rep_74_1999〉.
    Details
    Publikationsdatum: 2017-11-13
    Materialart: Thesis , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 53
    facet.materialart.
    Unbekannt
    Late quaternary Arctic Ocean sediment records : surface ocean conditions and provenance of ice rafted debris (1996)
    GEOMAR Forschungszentrum für marine Geowissenschaften
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, 125 pp . GEOMAR-Report, 065 . DOI 10.3289/geomar_rep_65_1997 〈http://dx.doi.org/10.3289/geomar_rep_65_1997〉.
    Details
    Publikationsdatum: 2015-01-21
    Materialart: Thesis , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 54
    facet.materialart.
    Unbekannt
    Stofftransport durch die Bodengrenzschicht : Regionalisierung und Bilanzierung für den Nordatlantik und das Europäische Nordmeer (1996)
    GEOMAR Forschungszentrum für marine Geowissenschaften
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, 177 pp . GEOMAR-Report, 067 . DOI 10.3289/geomar_rep_67_1998 〈http://dx.doi.org/10.3289/geomar_rep_67_1998〉.
    Details
    Publikationsdatum: 2015-01-21
    Materialart: Thesis , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 55
    facet.materialart.
    Unbekannt
    Authigener Klinoptilolith in marinen Sedimenten : Mineralchemie, Genese und mögliche Anwendung als Geothermometer (1996)
    GEOMAR Forschungszentrum für marine Geowissenschaften
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, 174 pp . GEOMAR-Report, 066 . DOI 10.3289/geomar_rep_66_1997 〈http://dx.doi.org/10.3289/geomar_rep_66_1997〉.
    Details
    Publikationsdatum: 2015-01-21
    Materialart: Thesis , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 56
    facet.materialart.
    Unbekannt
    Dynamics of picophytoplankton, ultraphytoplankton and bacteria in the central equatorial Pacific (1996)
    Elsevier
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 43 (4-6). pp. 907-931.
    Details
    Publikationsdatum: 2019-03-06
    Beschreibung: Pico- and ultraplankton are known to contribute significantly to overall biomass and primary productivity in the 'high nutrient low chlorophyll' waters of the equatorial Pacific. In order to understand the dynamics of this community on ecologically relevant time-scales, we examined the abundance, distribution and cellular characteristics of Prochlorococcus, Synechococcus, eukaryotic ultraphytoplankton and heterotrophic bacteria during two 20-day time-series at 0°N, 140°W in the spring and fall of 1992 (JGOFS time-series cruises. TS-I and TS-II). Prochlorococcus was numerically dominant among the autotrophic groups considered, with mean cell concentrations in surface waters on the order of 1.4 x 105 cells ml-1. Synechococcus and ultraphytoplankton abundances were 17-30-fold lower than those of Prochlorococcus, and heterotrophic bacterial abundances were 5-7-fold higher (during TS-I and TS-II, respectively). Daily cell abundances for all groups varied by factors of 1.5-2 within each time-series. Depth-integrated Prochlorococcus abundance averaged over each time-series was 25 lower during TS-II relative to TS-I; ultraphytoplankton abundance was 42 higher during the same period. Prochlorococcus and ultraphytoplankton both contributed significantly to the estimated total autotrophic biomass; Synechococcus contributed relatively little. Estimated total photosynthetic pico- plus ultraplankton biomass was on average 30 higher than heterotrophic bacterial biomass. Changes in the fluorescence and light scatter properties of individual Prochlorococcus cells were observed during the passage of a tropical instability wave during TS-II, and are hypothesized to reflect a physiological response among these cells to that event Examination of bulk properties alone (e.g. cell numbers or total red fluorescence) would not have revealed these physiological changes. Lower bounds for Prochlorococcus-specific growth rates were calculated based on the DNA distributions of these populations at dusk. These rates were maximal at 15 or 30 m depth, where they approached one doubling per day. Changes in Prochlorococcus forward tingle light scatter (FALS) from dawn to dusk were well correlated with these estimates of specific growth rate, an observation that allowed us to relate measurements of FALS to cell volume for Prochlorococcus.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 57
    facet.materialart.
    Unbekannt
    Chemical composition of volcanic gases (1996)
    Springer
    In:  In: Monitoring and mitigation of volcano hazards. , ed. by Scarpa, R. and Tilling, R. I. Springer, Berlin, pp. 221-256. ISBN 3-540-60713-7
    Details
    Publikationsdatum: 2019-02-11
    Materialart: Book chapter , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 58
    facet.materialart.
    Unbekannt
    The small-scale squid hand-jig fishery off the northwestern Iberian Peninsula: application of a model based on a short survey of fishery statistics (1996)
    Elsevier
    In:  Fisheries Research, 25 . pp. 253-263.
    Details
    Publikationsdatum: 2020-11-09
    Beschreibung: A small-scale squid hand-jig fishery targeting the squids Loligo vulgaris and Loligo forbesi exists in the northwestern Iberian Peninsula. Its importance is evaluated using a model based on a short survey of fishery statistics. A total of 46 ports in Galicia operate this fishery. Theseportswere classified into three categories, according to characteristics relevant to the length of season in the fishery. Again, Cedeira and Muardos were selected as "model ports" for each of the three categories. The catch per unit effort and total catch were estimated for each of these model ports. Total catch for each port was estimated taking into account the catch obtained in each model port multiplied by a suitable correction factor based on the number of boats in each port. The ports of each of the three categories were considered separately. Thus we can obtain the total catch of the 46 Galician ports where this fishing activity takes place. It was calculated that the small-scale hand-jjig fishery unloaded 282 t of squid in Galicia in 1992. The accuracy of the model based on a short survey of fishery statistics was tested by comparing estimates of catches with real squid landing data recorded in Aguiño in 1992. It was observed that the difference between the estimates (15.5 and 14.6 t, respectively) was 5.8%. Information on the characteristics of this fishery, seasonality, type and the number of fishing boats is included in this paper, which represents the first step towards assesing the magnitude of the squid resource in the hand-jig Galician fishery.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 59
    facet.materialart.
    Unbekannt
    Swimming behaviour and food searching in planctonic Octopus vulgaris cuvier from hatching to settlement (1996)
    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology, 208 . pp. 169-184.
    Details
    Publikationsdatum: 2020-11-16
    Beschreibung: The planctonic life in Mediterranean Octopus vulgaris lasts about 2 months but we know virtually nothing of this phase of its life history, which represents around 10-15% of the estimated life span. Swimming behaviour from hatching to settlement was studied by video-recording techniques, using five groups aged 1,15,30,42 and 60 days, by when they have become benthic. During the planctonic stage, the backwards, squid.like jet swimming was the predominant type of displacement. Strong morphometric changes, basically in arm growth, influence their jetting capacities and probably the settlement process. Feeding behaviour was analyzed using two species of decapod zoeae as prey, Liocarcinus depurator (L.) and Pagurus prideaux Leach; it is that of a visual predator. The forward displacement typically forms part of this predatory behaviour. During the planctonic phase, the presence of prey increase the turning rate and reduces the swimming speed of Octopus vulgaris individuals. Both responses may improve the exploitation of patchy food environments.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 60
    facet.materialart.
    Unbekannt
    Genetic differentiation in three Sepia species (Mollusca: Cephalopoda) from Galician waters (north-west Iberian Peninsula) (1996)
    Springer
    In:  Marine Biology, 126 . pp. 253-259.
    Details
    Publikationsdatum: 2020-11-06
    Beschreibung: The systematics of the genus Sepia is not yet clear. Morphological evidence has led to S. officinalis Linnaeus, 1758 being considered as belonging to the subgenus Sepia sensu stricto, and S. obignyana Férusac, 1826 and S. elegans Blainville, 1827 as belonging to the subgenus Rhombosepion. Samples of 30 individuals ocenographic boundary off the north-west Iberian Peninsula, and a sample of S. elegans from the northern side, were collected in 1993-1994. Allozyme electrophoresis for 32 presumptive loci revealed low levels of genetic variability for the three Sepia species (mean expected heterozygosity estimates were 〈0.052). No significant differences in allozyme frequencies were detected among populations of either S. officinalis and S. orbignyana (I=0.12) and of S. elegans (I=0.13) were significantly different from that of S. orbignyana and S. elegans (I=0.49). The former are typical of values for confamiliar genera, and a new generic status is proposed for the latter two species, which become Rhombosepion orbignyana (Férussac, 1826) and R. elegans (Blainville, 1827).
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 61
    facet.materialart.
    Unbekannt
    Allozyme electrophoretic technique and phylogenetic relationships in three species of Sepia (Cephalopoda: Sepiidae) (1996)
    Elsevier
    In:  Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 114 (1). pp. 11-18.
    Details
    Publikationsdatum: 2021-01-19
    Beschreibung: Samples of Sepia officinalis, S. orbignyana, and S. elegans from Galician waters (NW Iberian Peninsula) were obtained from commercial catches in three fishing ports. A preliminary screening for 47 and 33 enzymes in mantle muscle and digestive gland, respectively, was carried out using seven buffer systems. Thirty-seven enzyme loci were resolved from these tissues using only two buffer systems. Most enzymes shpwed equal or higher activity for the digestive gland than for the mantle muscle in freshly-caught samples of S. officinalis and S. orbignyana. The activity of a large number of enzymes decreased faster in the digestive gland than in the mantle muscle after 6-12 h at room temperature. Consequently, we suggest that mantle muscle rather than digestive gland be used for routine electrophoretic studies in Sepia species obtained from commercial catches. A phylogenetic reconstruction analysis, applying the Wagner parsimony method and using the ommastrephid species Illex coindetii as outgroup, showed only one most parsiminious tree. S. orbigyana and S. elegans were found to be a sister group. The topology agreed with that recently obtained from mitochondrial rDNA sequences, and both molecular data are in line with previous morphological results. They confirm the view that S. orbignyana and S. elegans belong to a different subgenus (Rhombosepion) from that of S. officinalis (Sepia "sensu stricto").
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 62
    facet.materialart.
    Unbekannt
    Interactions between longline vessels and seabirds in Kerguelen waters and a method to reduce seabird mortality (1996)
    Elsevier
    In:  Biological Conservation, 75 (1). pp. 63-70.
    Details
    Publikationsdatum: 2021-04-19
    Beschreibung: A longline fishery for Dissostichus eleginoides has recently developed in the vicinity of South Georgia and Kerguelen islands, two internationally important breeding areas for procellariiform birds. The number of hooked birds and a method to reduce mortality were investigated during 13 days of fishing activity in Kerguelen waters in February 1994. Between 100 and 600 seabirds were always observed behind the longline vessel during daytime. The main ship-following species were the white-chinned petrel Procellaria aequinoctialis (67% of counts), giant petrels Macronectes spp. (8%) and the wandering albatross Diomedea exulans (11%), black-browed albatross D. melanophris (6%) and grey-headed albatross D. chrysostoma (2%). Only diving species were caught on the lines, i.e. the white-chinned petrel (n = 36) and the grey-headed albatross (n = 2). Marked differences in the mortality rate were observed between day and night (1·00 versus 0·38 birds per 1000 hooks), and at night when the decklights were on or off (0·59 versus 0·15 birds per 1000 hooks). Dumping of homogenized offal during line settings greatly reduced incidental capture of seabirds, mainly because birds were more attracted by offal than by hooked baits. We therefore propose that the dumping of offal during line settings should be included in the regulations of the longline fishery for Dissostichus in order to minimize seabird mortality.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 63
    facet.materialart.
    Unbekannt
    Do cuttlefish (Cephalopoda) signal their intentions to conspecifics during agonistic encounters? (1996)
    Elsevier
    In:  Animal Behaviour, 52 (1). pp. 73-81.
    Details
    Publikationsdatum: 2021-04-30
    Beschreibung: Male cuttlefish adopt a specific body pattern during agonistic behaviour called the Intense Zebra Display. Some components of the Display were variable, especially the chromatic component termed ‘dark face’, which could vary in the degree of darkness. Facial darkness was measured using a video analysis system. Males that eventually withdrew from conspecifics without fighting maintained a lighter face during the initial stage of agonistic encounters. When both males maintained dark faces, physical contact and fighting ensued. Therefore facial darkness could be used to predict which male–male encounters would escalate to physical contact. The strong correlation between facial darkness and subsequent behaviour suggested that males were signalling their agonistic motivation at the early stages of the encounter, which is contrary to what would be predicted from a traditional game theory analysis. It is proposed that males signal intent because the Intense Zebra Display simultaneously serves two functions: (1) it identifies the signaller as male, thus preventing unwanted copulations from other males, and (2) it functions as part of the agonistic behavioural repertoire. By using a modified (i.e. lighter-faced) version of the Display, males may be able to signal their sex, but without inducing another male to attack. In cases in which agonistic displays perform more than one function, signalling intent (i.e. signalling its likely subsequent behaviour) can be an evolutionarily stable strategy.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 64
    facet.materialart.
    Unbekannt
    Assessment and management techniques for migratory annual squid stocks: the Illex argentinus fishery in the Southwest Atlantic as an example (1996)
    Elsevier
    In:  Fisheries Research, 28 (1). pp. 3-27.
    Details
    Publikationsdatum: 2021-02-22
    Beschreibung: Assessment methodology for squid fisheries is presented, extending previous work by considering migration between adjacent fishing grounds. The methods are based on standard Leslie-Delury analysis but make different assumptions about stock movement and the relation between stock abundance and catch per unit effort. The new methodology is applied to data from the Illex argentinus fishery in the Southwest Atlantic, south of 45 °S. Retrospective assessments for the 1987–1991 fishing seasons are presented, focusing on estimates of recruitment and spawning biomass. Management of the fishery around the Falkland Islands is based on effort control. The objective is to maintain the spawning biomass above a threshold level, thus avoiding high probabilities of low recruitment in the following season. The estimates of spawning biomass and recruitment from the analyses are used to estimate an appropriate threshold level of spawning biomass.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 65
    facet.materialart.
    Unbekannt
    Dynamics of antarctic penguin populations in relation to inter-annual variability in sea ice distribution (1996)
    Springer
    In:  Polar Biology, 16 (5). pp. 321-330.
    Details
    Publikationsdatum: 2021-04-15
    Beschreibung: To investigate the role of sea ice cover on penguin populations we used principal component analysis to compare population variables of Adélie (Pygoscelis adeliae) and chinstrap (Pygoscelis antarctica) penguins breeding on Signy Island, South Orkney Islands with local (from direct observations) and regional (from remote sensing data) sea ice variables. Throughout the study period, the Adélie penguin population size remained stable, whereas that of chinstrap penguins decreased slightly. For neither species were there significant relationships between population size and breeding success, except for an apparent inverse density-dependent relationship between the number of Adélie breeding pairs and the number of eggs hatching. For both species, no general relationship was found between either population size or breeding success and the local sea ice conditions. However, the regional sea ice extent at a particular time prior to the start of the breeding season was related to the number of birds that arrived to breed. For both species, this period occurred before the sea ice reached its maximum extent and was slightly earlier for Adélie than for chinstrap penguins. These results suggest that sea ice conditions outside the breeding season may play an important role in penguin population processes.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 66
    facet.materialart.
    Unbekannt
    Signs of an extended and intermitted terminal spawning in the squids Loligo vulgaris Lamrck and Loligo forbesi Steenstrup (Cephalopoda: Loliginidae) (1996)
    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology, 207 . pp. 177-189.
    Details
    Publikationsdatum: 2020-11-16
    Beschreibung: The reproductive pattern of Loligo vulgaris and Loligo forbesi was studied on the basis of gonad maturation, mating and spawning in males and females of both species which were present off the northwest coast of Spain (Galicia), between February 1991 and February 1993. The mature females of both species have several modes of egg sizes and development stages within the ovary. Several signs indivate that both female Loligo vulgaris and L. forbesi undergo partial ovulation at the ame time of spawning, the spawning period being relatively long, although in no case representing the greatest fraction of the animal's life before death. Egg-laying occuring in separate batches and somatic growth between egg batchs has not been observed. This reproductive pattern is defined as intermitted terminal spwaning. Some other terms describing different cephalopod reproductive strategies are also defined.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 67
    facet.materialart.
    Unbekannt
    Marine parasites as biological tags of cephalopod hosts (1996)
    Elsevier
    In:  Parasitology Today, 12 (8). pp. 324-327.
    Details
    Publikationsdatum: 2021-06-18
    Beschreibung: The use of marine parasites as non-intrusive natural tags of their hosts was first broadly applied in fisheries science in the 1940s. Both micro- and macroparasites have been used to assess the status of current stocks of several commercially exploited species of marine animals. Here, Santiago Pascual and Eric Hochberg offer a brief comment on marine parasite tags as a stock assessment methodology, with special reference to cephalopod hosts.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 68
    facet.materialart.
    Unbekannt
    The Aegean Sea as a source of atmospheric nitrous oxide and methane (1996)
    Elsevier
    In:  Marine Chemistry, 53 . pp. 41-49.
    Details
    Publikationsdatum: 2017-08-18
    Beschreibung: During the EGAMES (Evasion of GAses from the MEditerranean Sea) expedition in July 1993 we determined the concentrations of nitrous oxide and methane in the atmosphere and in the surface waters of the Aegean Sea, the northwestern Levantine Basin, the eastern Ionian Sea and the Amvrakikos Bay. Both gases were found to be supersaturated in all sampled areas. Nitrous oxide was homogeneously distributed with a mean saturation of 105 ± 2%, showing no differences between shelf and open ocean areas, whereas methane saturation values ranged from about 1.2 times (northwestern Levantine Basin) to more than 5 times solubility equilibrium (Amvrakikos Bay estuary). Therefore the Aegean Sea and the adjacent areas were sources of atmospheric nitrous oxide and methane during the study period.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 69
    facet.materialart.
    Unbekannt
    Authigenic barites and fluxes of barium associated with fluid seeps in the Peru subduction zone (1996)
    Elsevier
    In:  Earth and Planetary Science Letters, 144 (3-4). pp. 469-481.
    Details
    Publikationsdatum: 2016-11-14
    Beschreibung: Large deposits of barite were discovered in association with biological communities, indicative of active fluid seepage on the middle slope of Paita and in the Chiclayo Canyon, in the Peru margin. We postulate that the barium source for the deposits is associated with the high concentration of non-detrital barite buried in sediments from this high productivity region. Barite is remobilized within the sediment column due to sulfate depletion. Subsequent flushing of the barium-rich fluids from the sediment to the bottom water, leads to the formation of barite deposits at the cold vent sites. High barium concentrations measured in pore fluids of sediments are consistent with remobilization of barium sulfate below the zone of sulfate depletion. Fluid samples—collected in a time sequence using a benthic chamber in the Paita middle slope vent sites — document a contemporaneous release of barium to the bottom water at a rate of 23 μmol cm−2 yr−1. Fluid seepage in the Peru margin is not restricted to the middle slope of Paita and the Chiclayo Canyon where barite deposits occur, but is also evident in the upper and lower slopes of Paita and in the Chimbote upper slope. Deployment of a benthic chamber on the Chimbote upper slope site show no measurable release of barium; even though the dissolved barium concentration in the pore fluids is high. These observations indicate that the barite deposits associated with fluid seepage in the Peru margin are restricted to areas where slope failure has exposed sequences deep enough such that the barium-rich fluids do not encounter sulfate-bearing pore fluids before emanating at the seafloor.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 70
    facet.materialart.
    Unbekannt
    Warming trend in Antarctic Bottom Water flowing into the Brazil Basin (1996)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 43 (9). pp. 1461-1473.
    Details
    Publikationsdatum: 2016-10-20
    Beschreibung: As a contribution to the World Ocean Circulation Experiment's Deep Basin Experiment an array of current meters was deployed across the southern boundary of the Brazil Basin in early 1991 and subsequently recovered in late 1992. On the associated mooring cruises two hydrographic sections were also made. Both the current meter and shipboard temperature measurements show a significant warming of the Antarctic Bottom Water flowing into the Brazil Basin. This amounts to approximately 0.1 °C at 0.2°C, the coldest layer flowing over the Lower Santos Plateau, and 0.03°C in the coldest water that flows northward through the Vema Channel. In the latter, measurements over the past 20 years suggest little variation (〈0.005°C) so the 0.03°C change over a 2 year period is considered quite significant.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 71
    facet.materialart.
    Unbekannt
    Early concepts and charts of ocean circulation (1996)
    Elsevier
    In:  Progress in Oceanography, 37 (1). pp. 1-115.
    Details
    Publikationsdatum: 2016-10-07
    Beschreibung: Charts of ocean currents from the late nineteenth century show that already by then the patterns of surface circulation in regions away from polar latitudes were well understood. This fundamental knowledge accumulated gradually through centuries of sea travel and had reached a state of near correctness by the time dedicated research cruises, full-depth measurements and the practical application of the dynamical method were being instituted. Perhaps because of the foregoing, many of the pioneering works, critical to establishing what the upper-level circulation is like, the majority of the charts accompanying them, and several of the groundbreaking theoretical treatments on the physics of currents, are only poorly known to present-day oceanographers.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 72
    facet.materialart.
    Unbekannt
    Geochemistry of lavas from the Ahu and Tupa volcanic fields, Easter Hotspot, southeast Pacific: Implications for intraplate magma genesis near a spreading axis (1996)
    Elsevier
    In:  Earth and Planetary Science Letters, 137 (1-4). pp. 129-143.
    Details
    Publikationsdatum: 2016-11-14
    Beschreibung: Lavas from two young volcanic fields of the Easter Hotspot consist mainly of enriched tholeiites, with incompatible element and isotopic compositions similar to enriched MORB from the neighbouring spreading axis. The major element composition of these intraplate tholeiites suggests that they originate from melting at greater pressures, and REE models indicate slightly lower degrees of partial melting than beneath the ridge. This can be explained by the thickening of the lithosphere away from the spreading axis, accompanied by increasing mantle temperature as the Easter plume is approached. These processes combine to depress the melting zone to greater depth in the intraplate region. The relatively low degrees of partial melting and low volumes of melt compared, for example, to Galapagos imply a low excess temperature (∼ 100°C?) for the Easter plume. A few depleted tholeiites found on the Ahu volcanic field were generated by shallow melting of an extremely depleted (more depleted than MORB
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 73
    facet.materialart.
    Unbekannt
    The porins from the halophilic species Ectothiorhodospira shaposhnikovii and Ectothiorhodospira vacuolata (1996)
    Springer
    In:  Archives of Microbiology, 166 . pp. 169-175.
    Details
    Publikationsdatum: 2016-05-26
    Beschreibung: Major outer membrane proteins with porin activity were isolated from cell envelopes of the halophilic strains Ectothiorhodospira shaposhnikovii N1 and Ectothiorhodospira vacuolataβ1. The porins were obtained as oligomers. They dissociated into monomers by heat or EDTA treatment. The molecular masses of the monomers were determined by mass spectrometry to be 39,285 and 37,160 Da for E. shaposhnikovii N1 and E. vacuolataβ1, respectively. Both were shown by analytical ultracentrifugation to be trimers of about 112,000 Da. Circular dichroism spectra indicated predominantly β-sheet structure. The 18 N-terminal amino acid sequences of the two porins were identical except for the amino acids in positions 12 and 14. No sequence similarity with the primary structure of known porins was found. In reconstitution experiments with lipid bilayers, the porins of E. shaposhnikovii N1 and E. vacuolataβ1 formed channels with a single-channel conductance of 1.5 and 0.7 nS, respectively, in 1 M KCl. The single-channel conductance saturated with increasing salt concentration, indicating a putative binding-site for anions in the channel since both porins exhibited anion-selectivity. For the porin of E. vacuolataβ1, but not for that of E. shaposhnikovii N1, an influence of detergent concentration on the single-channel conductance was observed.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 74
    facet.materialart.
    Unbekannt
    Late Quaternary productivity changes in the western equatorial Atlantic: Evidence from 230Th normalized carbonate and organic carbon accumulation rates (1996)
    Elsevier
    In:  Marine Geology, 135 . pp. 127-152.
    Details
    Publikationsdatum: 2017-06-23
    Beschreibung: Paleoproductivity changes in the western equatorial Atlantic have been estimated from carbonate and marine organic carbon accumulation for the last 180,000 yr from a Ceará Rise sediment core GeoB 1523-1. Accumulation rates were calculated by normalizing to excess 230Th activity. Paleoproductivity from carbonate accumulation was estimated by a correlation between carbonate and organic carbon fluxes derived from sediment traps deployed in oligotrophic waters. Results indicate minor productivity changes varying around 30 gC m−2 yr−1 for organic carbon-derived estimations and around 45 gC m−2 yr−1 for carbonate-derived estimations, suggesting that the study area remained a low productivity region throughout the time period examined. Maxima in western Atlantic paleoproductivity occurred during the warm substages of glacials and interglacials, in contrast to the eastern tropical Atlantic where maxima are recorded in the cold substages. This contrast might be caused by a deepening of the thermocline and nutricline in the west connected with a synchronous shallowing in the east. The carbonate preservation record was examined for the last 380,000 yr based on variations in percent planktonic foraminiferal fragments and percent coarse fraction. Only minor carbonate dissolution above 3300 m water depth is observed, except for three main dissolution events at isotope stages 4, 8.4 and 10. Considerable carbonate loss during these intervals is attributed to a decreased production of North Atlantic Deep Water which is associated with vertical expansion of Southern-Source Deep Water.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 75
    facet.materialart.
    Unbekannt
    A note on overflow eddies (1996)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 43 . pp. 1661-1667.
    Details
    Publikationsdatum: 2016-10-20
    Beschreibung: Satellite-tracked drifters drogued at 100 m depth show very intensive cyclonic eddies over the Denmark Strait Overflow Water (DSOW) along the continental slope of East Greenland between the Denmark Strait and Cape Farewell. Their core of 20 km diameter is probably in near solid-body rotation; azimuthal speed increases with depth, which is consistent with downward velocities in the core, and supports the conclusions of Bruce (1995). At 100m depth, velocities in the eddies reach 50 cm s−1 south of the Denmark Strait and 15 cm s−1 near Cape Farewell. Maximum speed in one of the eddies is found at the top of the DSOW, σθ = 27.80. The eddies may play an important role in water mass conversion in the Irminger Sea.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 76
    facet.materialart.
    Unbekannt
    Lagrangian measurements in the Malvinas current (1996)
    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Heidelberg, New York, pp. 239-247.
    Details
    Publikationsdatum: 2020-04-03
    Beschreibung: Direct measurements of magnitude of the northward flow of the Malvinas (Falkland) Current have recently been made with two types of Lagrangian platforms: ALACE floats which cycled between 750-m depth and the sea surface, and 100-m drogued surface drifters. Each data set clearly delineates the path of the Malvinas Current, and the vertical shears inferred from them are commensurate with historical geostrophic shears. Velocities from the surface drifters are used here to adjust geostrophic shears from historical measurements, and the results confirm a large transport of the current, as previously implied by numerical models and a regional inverse calculation. At 42°S, the northward transport of the Malvinas Current in the upper 3000 m appears to be about 70 Sv, several times larger than estimates obtained by adjusting geostrophic shears to assumed levels of no motion. This large barotropie component may have significance in the cross-frontal transfer of intermediate and deep waters from the circumpolar current to the adjacent flow regimes in the South Atlantic, and thus on the inter-basin exchange of water masses.
    Materialart: Book chapter , NonPeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 77
    facet.materialart.
    Unbekannt
    Behaviour patterns as natural antifouling mechanisms of tropical marine crabs (1996)
    Elsevier
    In:  Journal of Experimental Marine Biology and Ecology (203). pp. 245-258.
    Details
    Publikationsdatum: 2014-01-23
    Beschreibung: The investigations focused on defence (antifouling) adaptations of seven brachyuran species from the Gulf of Thailand against epibionts (bacteria, diatoms, protozoans, macroorganisms). The species were Calappa philargius (Calappidae), Scylla serrata, Charybdis anisodon, Podophthalmus vigil (Portunidae), Hexapus anfractatus (Goneplacidae), Etisus c.f. laevimanus (Xanthidae) and Metapograpsus quadridentatus (Grapsidae). Carapaces of free living crabs were less densely colonized by organisms than other submerged living and inanimate hard substrata in the same region. The significance of potential mechanical (moulting or sloughing, grooming), physical (surface tension), chemical (surface pH, bioactive compounds), behavioural (hiding, burying, night activity) and ecological (grazing by gastropods) mechanisms was assessed. No evidence was found for an antifouling role of surface pH, toxins, surface tension or carapace grazing by gastropods. Intermoult duration was too long to explain low infestation rates although moulting eventually interrupted the colonization process. The present results indicate that behaviour patterns of the crabs are most effective mechanisms for restricting epibiont colonization. These behaviour patterns include burying in the sediment, hiding in rock crevices or below stones, night-time activity and exposure to air (intertidal species). Burying impedes epibiont access to the body surface and may cause mechanical abrasion. Nocturnal activity, as well as preference for shaded habitats reduces algal growth. Intertidal crabs are protected against the settling stages when foraging above the water line. During emersion, epibionts are also subjected to desiccation stress.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 78
    facet.materialart.
    Unbekannt
    Geochemistry of lavas from Mohns Ridge, Norwegian-Greenland Sea: implications for melting conditions and magma sources near Jan Mayen (1996)
    Springer
    In:  Contributions to Mineralogy and Petrology, 123 (3). pp. 223-237.
    Details
    Publikationsdatum: 2016-09-21
    Beschreibung: Mohns Ridge lavas between 71 and 72°30′N (∼360 km) have heterogeneous compositions varying between alkali basalts and incompatible-element-depleted tholeiites. On a large scale there is a continuity of incompatible element and isotopic compositions between the alkali basalts from the island Jan Mayen and Mohns Ridge tholeiites. The variation in isotopes suggests a heterogeneous mantle which appears to be tapped preferentially by low degree melts (∼5%) close to Jan Mayen but also shows its signature much further north on Mohns Ridge. Three lava types with different incompatible element compositions [e.g. chondrite-normalized (La/Sm)N〈1 to 〉2] occur in the area at 72°N and were generated from this heterogeneous mantle. The relatively depleted tholeiitic melts were mixed with a small degree melt from an enriched source. The elements Ba, Rb and K of the enriched melt were probably buffered in the mantle by residual amphibole or phlogopite. That such a residual phase is stable in this region of oceanic mantle suggests both high water contents and low mantle temperatures, at odds with a hotspot origin for Jan Mayen. Instead we suggest that the melting may be induced by the lowered solidus temperature of a “wet” mantle. Mohns MORB (mid ocean ridge basalt) and Jan Mayen area alkali basalts have high contents of Ba and Rb compared to other incompatible elements (e.g. Ba/La 〉10). These ratios reflect the signature of the mantle source. Ratios of Ce/Pb and Rb/Cs are normal MORB mantle ratios of 25 and 80, respectively, thus the enrichments of Ba and Rb are not indicative of a sedimentary component added to the mantle source but were probably generated by the influence of a metasomatizing fluid, as supported by the presence of hydrous phases during the petrogenesis of the alkali basalts. Geophysical and petrological models suggest that Jan Mayen is not the product of hotspot activity above a mantle plume, and suggest instead that it owes its existence to the unique juxtaposition of a continental fragment, a fracture zone and a spreading axis in this part of the North Atlantic.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 79
    facet.materialart.
    Unbekannt
    Fish diet of the Antarcic fur seal, Arctocephalus gazella, in summer, at Stranger Point, King George Island, South Shetland Islands (1996)
    Springer
    In:  Polar Biology, 16 . pp. 353-355.
    Details
    Publikationsdatum: 2020-11-16
    Beschreibung: In February 1992, 34 faecal samples from non-breeding male Antarctic fur seals, Arctophalus gazella, were collected at Stranger Point, King George Island, South Shetlands. Fish constituted an important part of the diet, occuring in 90% of those scats containing prey remains. From 1162 otoliths found in the Myctophids and nototheniids represented together almost 90% of the fish eaten. The dominant species were Gymnoscopelus nicholsi, Pleuragramma antarcticum and Electrona antarctica, contributing 33.3%, 30.8% and 12.0% of the otoliths respectively. The standard length of these three species was estimated from otoliths with little or no signs of erosion. This study showed that fur seals fed mainly on pelagic fish species that are often associated with krill. These findings are corroborated by fur seal diving patterns.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 80
    facet.materialart.
    Unbekannt
    The diet of Antarctic fur seals Arctcephalus gazella during the breeding season at South Georgia (1996)
    Springer
    In:  Polar Biology, 16 . pp. 105-114.
    Details
    Publikationsdatum: 2020-11-16
    Beschreibung: The diet of lactating female Antarctic fur seals Arctocephalus gazella at South Georgia was investigated during the pup-rearing period (January/March) of 1991-1994. Antarctic krill Euphausia superba was the main prey item, occuring in 88% of all scats (n=497), whereas fish occured in 47% and squid in 5% of all scats. There was a considerable intra- and inter-annual variation in the characteristics of krill taken by fur seals. The distribution of krill sizes takes suggests that fur seals are not actively selecting particular sizes of krill available around South Georgia. The absence of group 3 krill (44-48mm in length) in the South Georgia area, as indicated by their absence in the diet of seals, is suggested as a possible reason for low availability of krill and the subsequent reproductive failure among krill predators. The frequency of occurence of fish was much higher than in previous studies; the pattern of fish consumption showed a consistent seasonal pattern in 3 of the 4 years studied. Of the total number of the myctophid Protomyctophum choriodon, the most numerous fish taxon, 98% were taken between early February and the middle of March. Champsocephalus gunnari and Lepidonothen larseni agg., which both feed on krill, dominated the fish component of diet outsided this period and together constituted 94% of the total estimated biomass of fish consumed. The intra- and inter-annual variability in the diet of Antarctic fur seals emphasise the need for diet studies to be conducted during the entire pup-rearing periods of several years.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 81
    facet.materialart.
    Unbekannt
    Fish and squid in the diet of king penguin chicks, Aptendonytes patagonicus, during winter at sub-antarctic Crozet Islands (1996)
    Springer
    In:  Marine Biology, 126 . pp. 559-570.
    Details
    Publikationsdatum: 2020-11-19
    Beschreibung: The diet of king penguins, Aptendonytes patagonicus, rearing chicks was studied during three consecutive austral winters (1990, 1991 and 1992) at Crozet Islands. The mean stomach content mass of the 47 samples was 503g. Percentages of wet and reconstituted masses showed that both fishes (66 and 36% respectively) and squid (34 and 64%) are important components of the winter diet. Juveniles of the demersal onychoteuthid squid Moroteuthis ingens from the bulk of the cephalopod diet, and this was the main species of mycophids eaten in summer by king penguins were either very rare in winter (Electrona carlsbergi) or accounted for a smaller proportion of the diet (Krefftichthys anderssoni = 1.5% by mass and Protomyctophum tenisoni = 4.6%). Five other myctophids, which are rarely consumed in summer, contributed 24% of the diet by mass in winter (Gymnoscopelus piabilis = 18.1%, Lampichthys procerus = 2.4%, G. nicholsi = 1.3%, and Metelectrona ventralis and Electrona subaspera = 1.0%). The greater diversity of prey in winter suggests a more opportunistic feefing behaviour at a time probably marked by a change in prey availability. Both the known ecology of the fish and squid prey and the barely digested state of some items suggest that in winter breeding adults forage in the outer shelf, upper slope and oceanic areas in the close vicinity of the Crozet Islands to feed their chicks. Finally, using kind penguins as biological samplers, the present work provides novel data on the previously unstudied mesopelagic/epibenthic marine community in waters surrounding the Crozet Islands. Seventeen myctophid fish have been identified to species level. These include several poorly known species in the southern Indian Ocean. The occurence of small, nearly intact, cephalopods in the diet of king penguins suggests that spwaning grounds of four squid species may be located near the Crozet Islands. Seventeen myctophid fish have been identified to species level. These include several poorly known species in the southern Indian Ocean. The occurence of small, nearly intact, cephalopods in the diet of king penguins suggest that spawning ground for four squid species may be located near the Crozet Archipelago.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 82
    facet.materialart.
    Unbekannt
    Biochemical genetic evidence supporting the taxonomic separation of Loligo edulis and Loligo chinensis (Cephalopoda: Teuthodiea) from the genus Loligo (1996)
    Springer
    In:  Marine Biology, 127 . pp. 97-104.
    Details
    Publikationsdatum: 2020-11-09
    Beschreibung: Confusion abounds regarding the relative generic status of many member species of the squid family Loliginidae. A taxonomic reorganisation within the family has been proposed in which Loligo species from the Indo-Pacific possessing photophores on the ink sac, including Loligo edulis and Loligo chinensis, are removed to the newly created genus Photololigo. This system of classification has not however gauined general acceptance, and some authors have continued to refer to these species as Loligo. Here biochemical genetic data gathererd using allozyme electrophoresis are presented supporting the assertion that L. edulis and L. chinensis should indeed be positioned in a genus distinct from that characterised by the type species Loligo vulgaris vulgaris. Cluster analysis of allele frequency data from 22 putative enzyme-coding loci suggests that L. edulis and L. vulgaris vulgaris as are members of the confamilial genera Alloteuthis, Uroteuthis and Sepioteuthis, and as such warrant separate generic status. We conclude that the genus Photololigo is valid.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 83
    facet.materialart.
    Unbekannt
    Possible imitation of jellyfish by the squid paralarvae of the family Gonatidae (Cephalopoda, Oegopsida) (1996)
    Springer
    In:  Polar Biology, 16 . pp. 531-534.
    Details
    Publikationsdatum: 2020-11-06
    Beschreibung: Paralarval behaviour of eight species of the family Gonatidae (Teuthodiea, Cephalopoda) was examined in small 3-1 aquaria on board ship during planktonic surveys, which were carried out above and off the continental slope of the western part of the Bering Sea. Undisturbed paralarvae moved in aquaria with an average frequency of 15-20 mantle contractions per minute. In response to a sudden disturbance (flash of light, impact to the aquarium wall) squids exhibited a defensive body posture, relaxing the mantle and pulling the head with tentacles and arms into the mantle cavity, thereby becoming similar in appearance, size and colour to small jellyfishes Aglantha digitalis (Hydromedusae)
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 84
    facet.materialart.
    Unbekannt
    Beak length analysis of arrow squid Nototodarus sloanii (Cephalopoda: Ommastrephidae) in southern new Zealand waters (1996)
    Springer
    In:  Polar Biology, 16 . pp. 227-230.
    Details
    Publikationsdatum: 2020-11-09
    Beschreibung: Beak length analysis was undertaken for the arrow squid Nototodarus sloanii in the New Zealand sector of the Southern Ocean between Stewart Island and the Auckland Islands. N. sloanii has a restricted range and is endemic to the waters around New Zealand and its associated southern islands, where it supports a fishery and is preyed upon by a number of fishes, marine mammals and birds. Lower rostral length (LRL) and upper rostral length (URL) were analysed to see how these beak measurements related to both mantle lentgh (ML) and wet weight (W). Both lower and upper rostral lengths could be used as useful predictors of ML and W in N. sloanii, as relationships had limited scatter and high correlation coefficients. The relationships between LRL and ML, and URL and ML were only linear after regressing log-transformed values of beak length against ML. However, the relationships between LRL and W, and URL and W were linear without transforming either the x or y values. These results are different from previously published beak length analysis of Nototodarus in New Zealand waters.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 85
    facet.materialart.
    Unbekannt
    Algen, Quallen, Wasserfloh: Die Welt des Planktons (1996)
    Springer
    In:  Springer, Berlin, Germany, 192 pp. ISBN 3-540-60307-7
    Details
    Publikationsdatum: 2012-02-28
    Materialart: Book , NonPeerReviewed
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 86
    facet.materialart.
    Unbekannt
    Thorium and uranium isotopes in a manganese nodule from the Peru basin determined by alpha spectrometry and thermal ionization mass spectrometry (TIMS): Are manganese supply and growth related to climate? (1996)
    Springer
    In:  Geologische Rundschau, 85 (3). pp. 577-585.
    Details
    Publikationsdatum: 2018-03-21
    Beschreibung: Thorium- and uranium isotopes were measured in a diagenetic manganese nodule from the Peru basin applying alpha- and thermal ionization mass spectrometry (TIMS). Alpha-counting of 62 samples was carried out with a depth resolution of 0.4 mm to gain a high-resolution230Thexcess profile. In addition, 17 samples were measured with TIMS to obtain precise isotope concentrations and isotope ratios. We got values of 0.06–0.59 ppb (230Th), 0.43–1.40 ppm (232Th), 0.09–0.49 ppb (234U) and 1.66–8.24 ppm (238U). The uranium activity ratio in the uppermost samples (1–6 mm) and in two further sections in the nodule at 12.5±1.0 mm and 27.3–33.5 mm comes close to the present ocean water value of 1.144±0.004. In two other sections of the nodule, this ratio is significantly higher, probably reflecting incorporation of diagenetic uranium. The upper 25 mm section of the Mn nodule shows a relatively smooth exponential decrease in the230Thexcess concentration (TIMS). The slope of the best fit yields a growth rate of 110 mm/Ma up to 24.5 mm depth. The section from 25 to 30.3 mm depth shows constant230Thexcess concentrations probably due to growth rates even faster than those in the top section of the nodule. From 33 to 50 mm depth, the growth rate is approximately 60 mm/Ma. Two layers in the nodule with distinct laminations (11–15 and 28–33 mm depth) probably formed during the transition from isotopic stage 8 to 7 and in stage 5e, respectively. The Mn/Fe ratio shows higher values during interglacials 5 and 7, and lower ones during glacials 4 and 6. A comparison of our data with data from adjacent sediment cores suggests (a) a variable supply of hydrothermal Mn to sediments and Mn nodules of the Peru basin or (b) suboxic conditions at the water sediment interface during periods with lower Mn/Fe ratios.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 87
    facet.materialart.
    Unbekannt
    Evidence for topography- and current-controlled deposition on the Reykjanes Ridge between 59°N and 60°N (1996)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 43 (11-12). pp. 1683-1711.
    Details
    Publikationsdatum: 2016-09-28
    Beschreibung: Sediment patterns derived from sediment sampling and acoustic subbottom profiling were mapped on the Reykjanes Ridge (North Atlantic) between 59°N and 60°N. Five discrete sediment echo patterns were distinguished and mapped on a regional scale. The prolonged and layered echo facies, which mainly reflect sediment filled basins on the ridge flanks, indicate deposition of predominantly fine-grained sediments deposited by the Iceland-Scotland Overflow Water. A combination of westward flowing currents spilling over the ridge crest due to the Coriolis force together with the existing morphology probably caused the N-S trending facies distribution pattern on the northwest flank. Furthermore, the modern surface sediment distribution is controlled by biological productivity, which is closely related to the mixing zone of cold subpolar surface water masses and the warm North Atlantic Current, and bottom water transport processes. The effect of bottom current transport is reflected in the pattern of settling velocity and sediment grain size. The clay mineral composition indicates that most of the fine-grained material is supplied predominantly from the Icelandic province by the Iceland-Scotland Overflow Water. Erosional processes are concentrated on narrow zones on top of the axial ridges and on the steep flanks of the Catalonia Seamount. Well-sorted foraminiferal sands on these exposed regions are assumed to represent residual sediments.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OCEANREP)
  • 88
    facet.materialart.
    Unbekannt
    Modeling the Possible Impact of Climate Change on Broad-Scale Vegetation Structure - Examples from Northern Europe (1996)
    Springer
    In:  Modeling the Possible Impact of Climate Change on Broad-Scale Vegetation Structure - Examples from Northern Europe | Global Change and Arctic Terrestrial Ecosystems
    Details
    Publikationsdatum: 2022-03-21
    Materialart: info:eu-repo/semantics/bookPart
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    CITATION PIK
  • 89
    facet.materialart.
    Unbekannt
    Psychologische und gesellschaftliche Dimensionen globaler KlimaverSnderungen (1996)
    Springer
    In:  Psychologische und gesellschaftliche Dimensionen globaler KlimaverSnderungen | Internationaler Naturschutz
    Details
    Publikationsdatum: 2022-03-21
    Materialart: info:eu-repo/semantics/bookPart
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    CITATION PIK
  • 90
    facet.materialart.
    Unbekannt
    Klimawirkungsforschung: Mögliche Folgen des Klimawandels für Europa (1996)
    Springer
    In:  Klimawirkungsforschung: Mögliche Folgen des Klimawandels für Europa | Klimapolitik - Naturwissenschaftliche Grundlagen internationale Regimebildung und Konflikte, ökonomi
    Details
    Publikationsdatum: 2022-03-21
    Materialart: info:eu-repo/semantics/bookPart
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    CITATION PIK
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...