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  • Cambridge University Press  (14,843)
  • PANGAEA
  • 1990-1994  (20,589)
  • 1955-1959  (2,214)
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Year
  • 1
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    Documentation of sediment core PS1392-1 (1993)
    PANGAEA
    In:  Alfred Wegener Institute - Polarstern core repository | Supplement to: Grobe, Hannes; Huybrechts, Philippe; Fütterer, Dieter K (1993): Late Quarternary record of sea level changes in the Antarctic. Geologische Rundschau, 82(2), 263-275, https://doi.org/10.1007/BF00191832
    Details
    Publication Date: 2024-06-26
    Description: The Late Quaternary sediment sequence of the continental margin in the eastern Weddell Sea is well suited for palaeoenvironmental reconstructions. Two cores from the upper slope, which contain the sedimentary record of the last 300 ky, have been sedimentologically investigated. Age models are based on lithostratigraphy and are correlated with the stable isotope record. As a result of a detailed analysis of the clay mineral composition, grain size distributions and structures, this sedimentary record provides the first marine evidence that the Antarctic ice sheet extended to the shelf edge during the last glacial. The variations in volume and size of the ice sheet were also simulated in numerical models. Changes in accumulation rate and ice temperature are of some importance, but the model revealed that fluctuations are primarily driven by changes in eustatic sea-level and that the ice edge extended to the shelf edge during the last glacial maximum. This causal relationship implies that the maximum ice extension strongly depends on the magnitude and duration of the sea-level depression during a glacial period. The results of the sedimentological investigations and of the numerical models show that the Antarctic ice sheet follows glacial events in the northern hemisphere by teleconnections of sea level.
    Keywords: ANT-IV/3; Atka Bay; AWI_Paleo; Gravity corer (Kiel type); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS08; PS08/371; PS1392-1; SL
    Type: Dataset
    Format: unknown
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  • 2
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    Chemical composition of DSDP and ODP cherts (1992)
    PANGAEA
    In:  Supplement to: Murray, Richard W; Buchholtz ten Brink, Marilyn R; Gerlach, David C; Russ, III, Price G; Jones, David L (1992): Interoceanic variation in the rare earth, major, and trace element depositional chemistry of chert: Perspectives gained from the DSDP and ODP record. Geochimica et Cosmochimica Acta, 56(5), 1897-1913, https://doi.org/10.1016/0016-7037(92)90319-E
    Details
    Publication Date: 2024-06-26
    Description: Rare earth element (REE), major, and trace element abundances and relative fractionations in forty nodular cherts sampled by the Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) indicate that the REE composition of chert records the interplay between terrigenous sources and scavenging from the local seawater. Major and (non-REE) trace element ratios indicate that the aluminosilicate fraction within the chert is similar to NASC (North American Shale Composite), with average Pacific chert including ~7% NASC-like particles, Indian chert ~11% NASC, Atlantic chert ~17% NASC, and southern high latitude (SHL) chert 53% NASC. Using La as a proxy for sum REE, approximations of excessive La (the amount of La in excess of that supplied by the detrital aluminosilicate fraction) indicate that Pacific chert contains the greatest excessive La (85% of total La) and SHL chert the least (38% of total La). As shown by interelement associations, this excessive La is most likely an adsorbed component onto aluminosilicate and phosphatic phases. Accordingly, chert from the large Pacific Ocean, where deposition occurs relatively removed from significant terrigenous input, records a depositional REE signal dominated by adsorption of dissolved REEs from seawater. Pacific chert Ce/Ce* 〈〈1 and normative La/Yb ~ 0.8-1, resulting from adsorption of local Ce-depleted seawater and preferential adsorption of LREEs from seawater (e.g., normative La/Yb ~0.4), which increases the normative La/Yb ratio recorded in chert. Chert from the Atlantic basin, a moderately sized ocean basin lined by passive margins and with more terrigenous input than the Pacific, records a mix of adsorptive and terrigenous REE signals, with moderately negative Ce anomalies and normative La/Yb ratios intermediate to those of the Pacific and those of terrigenous input. Chert from the SHL region is dominated by the large terrigenous input on the Antarctic passive margin, with inherited Ce/Ce* ~1 and inherited normative La/Yb values of ~1.2-1.4. Ce/Ce* does not vary with age, either throughout the entire data base or within a particular basin. Overall, Ce/Ce* does not correlate with P2O5 concentrations, even though phosphatic phases may be an important REE carrier.
    Keywords: 108-660A; 10-97; 115-707C; 115-711A; 15-146; 15-149; 16-162; 16-163; 17-167; 20-194; 20-198A; 21-208; 23-220; 25-245; 27-260; 28-267B; 28-268; 28-269; 28-269A; 2-8A; 30-288A; 32-304; 32-305; 32-307; 35-323; 41-370; 43-386; 50-416A; 51-417D; 62-465A; 63-467; 67-495; 69-504B; 71-513A; 75-530A; 7-67A; 86-581; 8-70B; Antarctic Ocean/BASIN; Antarctic Ocean/CONT RISE; Antarctic Ocean/PLAIN; Caribbean Sea/BASIN; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Gulf of Mexico/BANK; Indian Ocean//BASIN; Indian Ocean//PLAIN; Indian Ocean/Arabian Sea/HILL; Joides Resolution; Leg10; Leg108; Leg115; Leg15; Leg16; Leg17; Leg2; Leg20; Leg21; Leg23; Leg25; Leg27; Leg28; Leg30; Leg32; Leg35; Leg41; Leg43; Leg50; Leg51; Leg62; Leg63; Leg67; Leg69; Leg7; Leg71; Leg75; Leg8; Leg86; North Atlantic; North Atlantic/BASIN; North Atlantic/CONT RISE; North Pacific; North Pacific/ABYSSAL FLOOR; North Pacific/BASIN; North Pacific/CONT RISE; North Pacific/GAP; North Pacific/TRENCH; South Atlantic/FLANK; South Atlantic/RIDGE; South Atlantic Ocean; South Indian Ridge, South Indian Ocean; South Pacific; South Pacific/Tasman Sea/CONT RISE
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 3
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    Sedimentological and paleomagnetic investigations on two gravity cores and ODP sites 113-690 and 693 off Kapp Norvegia, Antarctic continental margin (1990)
    PANGAEA
    In:  Supplement to: Grobe, Hannes; Fütterer, Dieter K; Spieß, Volkhard (1990): Oligocene to Quaternary sedimentation processes on the Antarctic continental margin, ODP Leg 113, Site 693. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 121-131, https://doi.org/10.2973/odp.proc.sr.113.193.1990
    Details
    Publication Date: 2024-06-26
    Description: Oligocene to Quaternary sediments were recovered from the Antarctic continental margin in the eastern Weddell Sea during ODP Leg 113 and Polarstern expedition ANT-VI. Clay mineral composition and grain size distribution patterns are useful for distinguishing sediments that have been transported by ocean currents from those that were ice-rafted. This, in turn, has assisted in providing insights about the changing late Paleogene to Neogene sedimentary environment as the cryosphere developed in Antarctica. During the middle Oligocene, increasing glacial conditions on the continent are indicated by the presence of glauconite sands, that are interpreted to have formed on the shelf and then transported down the continental slope by advancing glaciers or as a result of sea-level lowering. The dominance of illite and a relatively high content of chlorite suggest predominantly physical weathering conditions on the continent. The high content of biogenic opal from the late Miocene to the late Pliocene resulted from increased upwelling processes at the continental margin due to increased wind strength related to global cooling. Partial melting of the ice-sheet occurred during an early Pliocene climate optimum as is shown by an increasing supply of predominantly current-derived sediment with a low mean grain size and peak values of smectite. Primary productivity decreased at ~ 3 Ma due to the development of a permanent sea-ice cover close to the continent. Late Pleistocene sediments are characterized by planktonic foraminifers and biogenic opal, concentrated in distinct horizons reflecting climatic cycles. Isotopic analysis of AT. pachyderma produced a stratigraphy which resulted in a calculated sedimentation rate of 1 cm/k.y. during the Pleistocene. Primary productivity was highest during the last three interglacial maxima and decreased during glacial episodes as a result of increasing sea-ice coverage.
    Keywords: 113-690B; 113-693B; ANT-V/4; ANT-VI/3; AWI_Paleo; DRILL; Drilling/drill rig; Gravity corer (Kiel type); Joides Resolution; Kapp Norvegia; Leg113; Ocean Drilling Program; ODP; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS10; PS10/694; PS12; PS12/302; PS1481-3; PS1591-1; SL; South Atlantic Ocean; Weddell Sea
    Type: Dataset
    Format: application/zip, 9 datasets
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  • 4
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    Organic carbon flux through the benthic community in the temperate abyssal Northeast Atlantic (1992)
    PANGAEA
    In:  Supplement to: Pfannkuche, Olaf (1992): Organic carbon flux through the benthic community in the temperate abyssal northeast Atlantic. In: Rowe, G T & Pariente, V (eds.), Deep-sea food chains and the global carbon cycle. Dordrecht, Kluwer Academic Publishers, 183-198
    Details
    Publication Date: 2024-06-26
    Description: In order to assess the carbon flux through the deep-sea benthic boundary layer, sediment community oxygen consumption (SCOC) was measured in different months and years at the BIOTRANS area in the abyssal northeastern Atlantic. SCOC varied seasonally with a maximum in July/August. Evidence is given for a direct coupling between a substantial sedimentation of phytodetritus and the seasonal increase in SCOC. Rapid colonization, growth and decomposition rates indicate that the deep-sea benthic microbial and protozoan biota can react quickly to substantial falls of particulate organic matter. They seem to be the most important groups to generate seasonal changes in deep-sea benthic carbon flux rates.
    Keywords: ADEPD; ANT-IV/1a; Atlantic Data Base for Exchange Processes at the Deep Sea Floor; Biotrans; Giant box corer; GKG; M69; M69_KG1046; M69_KG1047; M69_KG1048; M69_KG1049; M69_KG1050; M69_KG1051; M69_KG1052; M69_KG1053; M69_MC10; Meteor (1964); MUC; MultiCorer; NOAMP III; North Atlantic Ocean; Polarstern; PS08_KG1088; PS08_KG1092; PS08_KG1094; PS08_KG1101; PS08_KG1103; PS08_KG1107; PS08_KG1110; PS08_KG1112; PS08_MC25; PS08_MC27; PS08_MC28; PS08_MC31; PS08_MC33; PS08_MC34; PS08_MC35; PS08_MC36; PS08_MC37; PS08_MC38; PS08_MC39; PS08 NOAMP
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 5
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    Age models and stable isotopes of sediment cores from the northern seas (1992)
    PANGAEA
    In:  Supplement to: Köhler, Sabine E I (1992): Spätquartäre paläo-ozeanographische Entwicklung des Nordpolarmeeres anhand von Sauerstoff- und Kohlenstoff-Isotopenverhältnissen der planktischen Foraminifere. GEOMAR Report, GEOMAR Research Center for Marine Geosciences, Christian Albrechts University in Kiel, 13, 104 pp
    Details
    Publication Date: 2024-06-26
    Description: Oxygen and carbon isotope measurements were carried out on tests of planktic foraminifers N. pachyderma (sin.) from eight sediment cores taken from the eastern Arctic Ocean, the Fram Strait, and the lceland Sea, in order to reconstruct Arctic Ocean and Norwegian-Greenland Sea circulation patterns and ice covers during the last 130,000 years. In addition, the influence of ice, temperature and salinity effects on the isotopic signal was quantified. Isotope measurements on foraminifers from sediment surface samples were used to elucidate the ecology of N. pachyderma (sin.). Changes in the oxygen and carbon isotope composition of N. pachyderma (sin.) from sediment surface samples document the horizontal and vertical changes of water mass boundaries controlled by water temperature and salinity, because N. pachyderma (sin.) shows drastic changes in depth habitats, depending on the water mass properties. It was able to be shown that in the investigated areas a regional and spatial apparent increase of the ice effect occurred. This happened especially during the termination I by direct advection of meltwaters from nearby continents or during the termination and in interglacials by supply of isotopically light water from rivers. A northwardly proceeding overprint of the 'global' ice effect, increasing from the Norwegian-Greenland Sea to the Arctic Ocean, was not able to be demonstrated. By means of a model the influence of temperature and salinity on the global ice volume signal during the last 130,000 years was recorded. In combination with the results of this study, the model was the basis for a reconstruction of the paleoceanographic development of the Arctic Ocean and the Norwegian-Greenland Sea during this time interval. The conception of a relatively thick and permanent sea ice cover in the Nordic Seas during glacial times should be replaced by the model of a seasonally and regionally highly variable ice cover. Only during isotope stage 5e may there have been a local deep water formation in the Fram Strait.
    Keywords: 49-08; 49-13; 49-14; 49-15; 49-18; 49-20; 49-39; 49-43; 49-50; 52-04; 52-09; 52-14; 52-24; 52-28; 52-30; 52-33; 52-37; 52-38; 57-04; 57-06; 57-07; 57-08; 57-09; 57-10; 57-11; 57-12; 57-13; 57-14; 57-20; 58-08; Antarctic Ocean; Arctic Ocean; ARK-I/3; ARK-II/4; ARK-II/5; ARK-IV/3; ARK-VII/1; BC; Box corer; BS88/6_10B; BS88/6_3; BS88/6_4; BS88/6_6; BS88/6_7; BS88/6_8; CTD/Rosette; CTD-RO; Fram Strait; GEOMAR; Giant box corer; GIK13123-1; GIK13124-1; GIK13131-1; GIK13138-1; GIK13140-3; GIK13147-1; GIK13150-1; GIK16129-1; GIK16130-1; GIK16132-1; GIK16136-1; GIK16141-1; GIK16142-1; GIK16144-1; GIK16911-1; GIK16916-1; GIK16917-1; GIK16921-1; GIK21513-9 PS11/276-9; GIK21515-10 PS11/280-10; GIK21519-11 PS11/296-11; GIK21520-10 PS11/310-10; GIK21522-19 PS11/358-19; GIK21523-15 PS11/362-15; GIK21524-1 PS11/364-1; GIK21525-2 PS11/365-2; GIK21525-3 PS11/365-3; GIK21527-10 PS11/371-10; GIK21528-7 PS11/372-7; GIK21529-7 PS11/376-7; GIK21533-3 PS11/412; GIK21534-6 PS11/423-6; GIK21535-5 PS11/430-5; GIK21535-8 PS11/430-8; GIK21845-2 PS17/010; GIK21852-1 PS17/018; GIK23037-2; GIK23038-3; GIK23039-3; GIK23040-3; GIK23041-1; GIK23042-1; GIK23043-1; GIK23055-2; GIK23056-2; GIK23057-2; GIK23058-1; GIK23059-2; GIK23061-3; GIK23062-3; GIK23064-2; GIK23065-2; GIK23066-2; GIK23067-2; GIK23068-2; GIK23069-2; GIK23071-2; GIK23072-2; GIK23074-3; GIK23215-1 PS03/215; GIK23227-1 PS05/412; GIK23228-1 PS05/413; GIK23229-1 PS05/414; GIK23230-1 PS05/416; GIK23231-1 PS05/417; GIK23233-1 PS05/420; GIK23235-1 PS05/422; GIK23237-1 PS05/425; GIK23238-1 PS05/426; GIK23239-1 PS05/427; GIK23240-1 PS05/428; GIK23241-1 PS05/429; GIK23242-1 PS05/430; GIK23243-1 PS05/431; GIK23244-1 PS05/449; GIK23247-1 PS05/452; GIK-cruise; GKG; Gravity corer (Kiel type); Håkon Mosby; Helmholtz Centre for Ocean Research Kiel; HM49; HM49-08; HM49-13; HM49-14; HM49-15; HM49-18; HM49-20; HM49-39; HM49-43; HM49-50; HM52; HM52-04; HM52-09; HM52-14; HM52-24; HM52-28; HM52-30; HM52-33; HM52-37; HM52-38; HM57; HM57-04; HM57-06; HM57-07; HM57-08; HM57-09; HM57-10; HM57-11; HM57-12; HM57-13; HM57-14; HM57-20; HM58; HM58-08; HM82/83; Iceland Sea; KAL; Kasten corer; KOL; Kolbeinsey Ridge; M107-1; M2/1; M2/2; Meteor (1986); Nansen Basin; Norwegian-Greenland Sea/off Iceland; Norwegian Sea; Piston corer (Kiel type); PO158/A; Polarstern; POS158/1; POS158/1-GEOM_01/1-GKG; POS158/1-GEOM_03/1-GKG; POS158/1-GEOM_04/1-GKG; POS158/1-GEOM_06/1-GKG; Poseidon; PS03; PS05; PS11; PS1126-1; PS1227-1; PS1228-1; PS1229-1; PS1230-1; PS1231-1; PS1233-1; PS1235-1; PS1237-1; PS1238-1; PS1239-1; PS1240-1; PS1241-1; PS1242-1; PS1243-1; PS1244-1; PS1247-1; PS1513-9; PS1515-10; PS1519-11; PS1520-10; PS1522-19; PS1523-15; PS1524-1; PS1525-2; PS1525-3; PS1527-10; PS1528-7; PS1529-7; PS1533-3; PS1534-6; PS1535-5; PS1535-8; PS17; PS1845-2; PS1852-1; Quaternary Environment of the Eurasian North; QUEEN; SL; Svalbard; Voering Plateau; Voring Plateau; Yermak Plateau
    Type: Dataset
    Format: application/zip, 31 datasets
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  • 6
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    Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic (1993)
    PANGAEA
    In:  Supplement to: Rutgers van der Loeff, Michiel M; Berger, Gijs W (1993): Scavenging of 230Th and 231Pa near the antarctic polar front in the South Atlantic. Deep Sea Research Part I: Oceanographic Research Papers, 40(2), 339-357, https://doi.org/10.1016/0967-0637(93)90007-P
    Details
    Publication Date: 2024-06-26
    Description: Vertical profiles of dissolved and particulate 230Th and 231Pa were obtained across the Antarctic Circumpolar Current (ACC) in the southern Atlantic. North of the Polar Front, dissolved and total 230Th increase with depth in conformity with published scavenging models. There is no depletion of 230Th or 231Pa in the water column south of the Polar Front, thought to be an area of enhanced biological productivity. 230Th concentrations increase three-fold to the Weddell Sea across the ACC. Dissolved and total 231Pa concentrations are relatively constant below 500 m depth at about 0.3 dpm m**-3, and change little with depth or latitude. The results from the Weddell Gyre are explained by a mixing-scavenging model that takes into account the input of lower Circumpolar Deep Water through upwelling, which is the main source of water in the Weddell Gyre and is enriched in 230Th but not in 231Pa. 230Th accumulates in the Weddell Gyre as a result of a reduction in the scavenging rate and by ingrowth from 234U. Ingrowth is more significant for 230Th than for 231Pa because the residence time of water in the gyre (about 35 years) is similar to the scavenging residence time of Th in the south Atlantic (29 years) but shorter than that of Pa (120 years). It is argued that changes in 230Th accumulation in the past may reflect changes in water residence time and in the formation rate of Weddell Sea Deep Water.
    Keywords: Agulhas Basin; ANT-IX/3; ANT-VIII/3; Atlantic Ridge; AWI_MarGeoChem; AWI_Paleo; Marine Geochemistry @ AWI; Maud Rise; Meteor Rise; MULT; Multiple investigations; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/267; PS16/281; PS16/294; PS16/311; PS16/321; PS16/342; PS16/362; PS16/370; PS1751-8; PS1755-2; PS1759-5; PS1768-2; PS1772-2; PS1777-8; PS1782-7; PS1785-1; PS18; PS18/227; PS2072; Shona Ridge; South Sandwich Basin; South Sandwich Trough; Water sample; WS
    Type: Dataset
    Format: application/zip, 9 datasets
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  • 7
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    Calcium carbonate preservation in the equatorial Pacific (1991)
    PANGAEA
    In:  Supplement to: Farrell, John W; Prell, Warren L (1991): Pacific CaCO3 preservation and d18O since 4 Ma: paleoceanic and paleoclimatic implications. Paleoceanography, 6(4), 485-498, https://doi.org/10.1029/91PA00877
    Details
    Publication Date: 2024-06-26
    Description: The Pliocene-Pleistocene history of CaCO3 preservation in the central equatorial Pacific is reconstructed from a suite of deep-sea cores and is compared to fluctuations in global ice volume inferred from delta18O records. The results are highlighted by: (1) a strong covariation between CaCO3 preservation and ice volume over 104 to 106 year time scales; (2) a long-term increase in ice volume and CaCO3 preservation since 3.9 Ma demonstrated by a deepening of the lysocline and the carbonate critical depth; (3) a dramatic shift to greater CaCO3 preservation at 2.9 Ma; (4) distinctive ice-volume growth and CaCO3 preservation events at 2.4 Ma, which are associated with the significant intensification of northern hemisphere glaciation; (5) a mid-Pleistocene transition to 100-kyr cyclicity in both CaCO3 preservation and ice volume; and (6) a 600-kyr Brunhes dissolution cycle superimposed on the late Pleistocene glacial/interglacial 100-kyr cycles. CaCO3 preservation primarily reflects the carbonate chemistry of abyssal waters and is controlled by long-term (106 year) and short-term (104 to 105 year) biogeochemical cycling and by distinct paleoclimatic events. We attribute the long-term increase in CaCO3 preservation primarily to a fractionation of CaCO3 deposition from continental shelf to ocean basin, and secondarily to a gradual rise in the riverine and glaciofluvial flux of Ca++. On shorter time scales, the fluctuations in CaCO3 preservation slightly lag ice volume fluctuations and are attributed to climatically induced changes in the circulation and chemistry of Pacific deep water.
    Keywords: 85-572A; 85-572C; 85-573A; 85-574; Albatross IV (1963); core_59; core_60; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; GC; Glomar Challenger; Gravity corer; Lamont-Doherty Earth Observatory, Columbia University; LDEO; Leg85; Melville; MN76-01, Pleiades; NODC-0418; North Pacific; North Pacific/TROUGH; Pacific Ocean; PC; Piston corer; PLDS-130P; PLDS-4; RC11; RC1112; RC11-209; RC11-210; RC12; RC12-63; RC12-65; RC12-66; Robert Conrad; SDSE_090; SDSE_092; SwedishDeepSeaExpedition; V24; V24-55; V24-58; V24-59; V24-62; V28; V28-179; Vema; W8402A; W8402A-14; Wecoma
    Type: Dataset
    Format: application/zip, 19 datasets
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  • 8
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    Carbon and nitrogen content of marine pore waters (1993)
    PANGAEA
    In:  Supplement to: Martin, William R; McCorkle, Daniel C (1993): Dissolved organic carbon concentrations in marine pore waters determined by high-temperature oxidation. Limnology and Oceanography, 38(7), 1464-1479, https://doi.org/10.4319/lo.1993.38.7.1464
    Details
    Publication Date: 2024-06-26
    Description: We have developed sampling methods and an analytical system to determine the concentration of dissolved organic C (DOC) in marine pore waters. Our analytical approach is a modification of recently developed high-temperature, Pt-catalyzed oxidation methods; it uses Chromatographic trapping of the DOC-derived CO2 followed by reduction to CH4 and flame ionization detection. Sampling experiments with nearshore sediments indicate that pore-water separation by whole-core squeezing causes artificially elevated DOC concentrations, while pore-water recovery by sectioning and centrifugation does not appear to introduce DOC artifacts. Results from a set of northwestern Atlantic continental slope cores suggest that net DOC production accounts for 〉50% of the organic C that is recycled at the sediment-water interface.
    Keywords: ADEPD; ADEPDCruises; Atlantic Data Base for Exchange Processes at the Deep Sea Floor; CENT; Centrifuge; M&M_A-c; M&M_A-wcs; M&M_B-c; M&M_B-wcs; M&M_D-c; M&M_D-wcs; M&M_F-c; WCS; Whole core squeezer
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 9
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    Radionuclides in the Weddell Sea (1994)
    PANGAEA
    In:  Supplement to: Rutgers van der Loeff, Michiel M (1994): 228Ra and 228Th in the Weddell Sea. In: Johannessen, O M; Muench, R D & Overland, J E (eds.), The polar oceans and their role in shaping the global environment. Geophysical Monograph Series, American Geophysical Union, 540 pages, ISBN 0-87590-042-9, 85, 177-186
    Details
    Publication Date: 2024-06-26
    Description: 228Ra and its granddaughter 228Th were measured on a N-S transect from 45's to the Antarctic continent across the Antarctic Circumpolar Current (ACC) and the Weddell Sea. The distributions of 230Th, 228Th and 228Ra show that southward transport across the ACC of Circumpolar Deep Water (CDW), the source of Warm Deep Water (WDW) in the Weddell Sea, occurs on a time scale between 8 and 30 years, in qualitative agreement with estimates of the upwelling rate of WDW. The distribution of 228Ra in deep waters is controlled by advection and isopycnal mixing rather than diapycnal mixing. In the Weddell Sea, deep-water 228Ra activities reach 15-20 dpm/m**3. Enrichment in deep water is controlled by the production in the deep-sea floor, favoured by low biogenic sediment accumulation rates and consequently high 232Th contents in the surface sediment (3 to 5 dpm/g). The highest 228Ra value (73 dpm/m**3) was observed near the sea floor in a channel where an eastern outflow of Weddell Sea Bottom Water (WSBW) is suspected. It is not yet known whether this value is produced in-situ by accumulation in the stratified bottom water, or contains a Signal of enrichment in shelf- and Ice Shelf Water. High 228Ra activities on the south-eastem shelf (22 dpm/m**3) and low activities offshore yield an estimated residente time of 1.5 years on this shelf and imply slow exchange with offshore waters.
    Keywords: Agulhas Basin; ANT-IX/3; ANT-VIII/3; ANT-X/6; Atlantic Ridge; AWI_MarGeoChem; AWI_Paleo; DIVERSE; Filchner Trough; Halley Bay; Lazarev Sea; Marine Geochemistry @ AWI; Maud Rise; Meteor Rise; MULT; Multiple investigations; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS16; PS16/267; PS16/281; PS16/294; PS16/311; PS16/321; PS16/342; PS16/362; PS16/370; PS1751-8; PS1755-2; PS1759-5; PS1768-2; PS1772-2; PS1777-8; PS1782-7; PS1785-1; PS18; PS18/126; PS18/127; PS18/141; PS18/153; PS18/163; PS18/196; PS18/199; PS18/200; PS18/202; PS18/227; PS1999; PS2011; PS2049; PS2051; PS2052; PS2054; PS2072; PS22; PS22/862; PS22/865; PS22/866; PS22/908; PS22/911; PS22/917; Sampling gear, diverse; Shona Ridge; South Atlantic Ocean; South Sandwich Basin; South Sandwich Trough; Water sample; Weddell Sea; WS
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 10
    facet.materialart.
    Unknown
    Compilation of measurements from two interdisciplinary STAR-shaped surveys in the North Sea: The ZISCH - Dataset (1990)
    PANGAEA
    In:  Institut für Meereskunde, Universität Hamburg
    Details
    Publication Date: 2024-06-26
    Description: The measurements were obtained during two North Sea wide STAR-shaped cruises during summer 1986 and winter 1987, which were performed to investigate the circulation induced transport and biologically induced pollutant transfer within the interdisciplinary research in the project "ZISCH - Zirkulation und Schadstoffumsatz in der Nordsee / Circulation and Contaminant Fluxes in the North Sea (1984-1989)". The inventory presents parameters measured on hydrodynamics, nutrient dynamics, ecosystem dynamics and pollutant dynamics in the pelagic and benthic realm. The research program had the objective of quantifying fluxes of major budgets, especially contaminants in the North Sea. In spring 1986, following the phytoplankton spring bloom, and in late winter 1987, at minimum primary production activity, the North Sea ecosystem was investigated on a station net covering the whole North Sea. The station net was shaped like a star. Sampling started in the centre, followed by the northwest section and moving counter clockwise around the North Sea following the residual currents. By this strategy, a time series was measured in the central North Sea and more synoptic data sets were obtained in the individual sections. Generally advection processes have to be considered when comparing the data from different stations. The entire sampling period lasted for more than six weeks in each cruise. Thus, a time-lag should be considered especially when comparing the data from the eastern and the western part of the central and northern North Sea, where samples were taken at the beginning and at the end of the campaign. The ZISCH investigations represented a qualitatively and quantitatively new approach to North Sea research in several respects. (1) The first simultaneous blanket coverage of all important biological, chemical and physical parameters in the entire North Sea ecosystem; (2) the first simultaneous measurements of major contaminants (metals and organohaline compounds) in the different ecosystem compartments; (3) simultaneous determinations of atmospheric inputs of momentum, energy and matter as important ecosystem boundary conditions; (4) performance of the complex measurement program during two seasons, namely the spring plankton bloom and the subsequent winter period of minimal biological activity; and (5) support of data analysis and interpretation by oceanographic and meteorological numerical models on the same scales.
    Keywords: Circulation and Transfer of Pollutants in the North Sea; MULT; Multiple investigations; North Sea; Skagerrak; South Atlantic Ocean; VA44; VA44_0/00; VA44_0/10; VA44_1/00; VA44_1/20; VA44_10/00; VA44_100/00; VA44_100/20; VA44_101/00; VA44_102/00; VA44_103/00; VA44_104/00; VA44_104/20; VA44_105/00; VA44_106/00; VA44_107/00; VA44_108/00; VA44_109/00; VA44_11/00; VA44_110/00; VA44_110/20; VA44_111/00; VA44_111/20; VA44_112/00; VA44_113/00; VA44_114/00; VA44_115/00; VA44_116/00; VA44_116/20; VA44_117/00; VA44_118/00; VA44_119/00; VA44_12/00; VA44_120/00; VA44_121/00; VA44_122/00; VA44_123/00; VA44_124/00; VA44_125/00; VA44_125/20; VA44_126/00; VA44_126/20; VA44_127/00; VA44_127/20; VA44_128/00; VA44_128/20; VA44_129/00; VA44_13/00; VA44_14/00; VA44_14/20; VA44_15/00; VA44_15/20; VA44_16/00; VA44_17/00; VA44_18/00; VA44_19/00; VA44_2/00; VA44_2/20; VA44_20/00; VA44_21/00; VA44_21/20; VA44_22/00; VA44_22/20; VA44_23/00; VA44_23/20; VA44_24/00; VA44_24/20; VA44_25/00; VA44_25/20; VA44_26/00; VA44_26/20; VA44_27/00; VA44_27/20; VA44_28/00; VA44_29/00; VA44_29/20; VA44_3/00; VA44_3/20; VA44_30/00; VA44_30/20; VA44_31/00; VA44_31/20; VA44_32/00; VA44_32/20; VA44_33/00; VA44_33/20; VA44_34/00; VA44_34/20; VA44_35/00; VA44_35/20; VA44_36/00; VA44_36/20; VA44_37/00; VA44_37/20; VA44_38/00; VA44_38/20; VA44_39/00; VA44_39/20; VA44_4/00; VA44_4/20; VA44_40/00; VA44_40/20; VA44_41/00; VA44_42/00; VA44_42/20; VA44_43/00; VA44_43/20; VA44_44/00; VA44_44/20; VA44_45/00; VA44_45/20; VA44_46/00; VA44_46/20; VA44_47/00; VA44_47/20; VA44_48/00; VA44_49/00; VA44_5/00; VA44_5/20; VA44_50/00; VA44_51/00; VA44_51/20; VA44_52/00; VA44_52/20; VA44_53/00; VA44_53/20; VA44_54/00; VA44_54/20; VA44_55/00; VA44_55/20; VA44_56/00; VA44_57/00; VA44_57/20; VA44_58/00; VA44_58/20; VA44_59/00; VA44_59/20; VA44_6/00; VA44_6/20; VA44_60/00; VA44_60/20; VA44_61/00; VA44_61/20; VA44_62/00; VA44_64/00; VA44_64/20; VA44_65/00; VA44_65/20; VA44_66/00; VA44_66/20; VA44_67/00; VA44_67/20; VA44_68/00; VA44_68/20; VA44_69/00; VA44_69/20; VA44_7/00; VA44_7/20; VA44_70/00; VA44_70/20; VA44_71/00; VA44_71/20; VA44_72/00; VA44_72/20; VA44_73/00; VA44_73/20; VA44_74/00; VA44_74/20; VA44_75/00; VA44_75/20; VA44_76/00; VA44_76/20; VA44_77/00; VA44_77/20; VA44_78/00; VA44_78/20; VA44_79/00; VA44_79/20; VA44_8/00; VA44_80/00; VA44_81/00; VA44_82/00; VA44_83/00; VA44_84/00; VA44_85/00; VA44_86/00; VA44_87/00; VA44_88/00; VA44_89/00; VA44_9/00; VA44_90/00; VA44_90/20; VA44_91/00; VA44_91/20; VA44_92/00; VA44_92/20; VA44_93/00; VA44_93/20; VA44_94/00; VA44_94/20; VA44_95/00; VA44_95/20; VA44_96/00; VA44_96/20; VA44_97/00; VA44_98/00; VA44_99/00; VA53; VA53_100-1; VA53_10-1; VA53_101-1; VA53_102-1; VA53_103-1; VA53_104-1; VA53_105-1; VA53_106-1; VA53_107-1; VA53_108-1; VA53_109-1; VA53_1-1; VA53_110-1; VA53_11-1; VA53_111-1; VA53_112-1; VA53_113-1; VA53_114-1; VA53_114-2; VA53_115-1; VA53_115-2; VA53_116-1; VA53_117-1; VA53_118-1; VA53_119-1; VA53_120-1; VA53_12-1; VA53_121-1; VA53_122-1; VA53_123-1; VA53_124-1; VA53_125-1; VA53_126-1; VA53_127-1; VA53_128-1; VA53_129-1; VA53_130-1; VA53_13-1; VA53_131-1; VA53_132-1; VA53_133-1; VA53_134-1; VA53_135-1; VA53_136-1; VA53_137-1; VA53_138-1; VA53_140-1; VA53_14-1; VA53_145-1; VA53_146-1; VA53_147-1; VA53_15-1; VA53_16-1; VA53_17-1; VA53_18-1; VA53_19-1; VA53_20-1; VA53_2-1; VA53_21-1; VA53_22-1; VA53_23-1; VA53_24-1; VA53_25-1; VA53_26-1; VA53_27-1; VA53_28-1; VA53_29-1; VA53_30-1; VA53_3-1; VA53_31-1; VA53_32-1; VA53_33-1; VA53_34-1; VA53_35-1; VA53_36-1; VA53_37-1; VA53_38-1; VA53_39-1; VA53_40-1; VA53_4-1; VA53_41-1; VA53_42-1; VA53_43-1; VA53_44-1; VA53_45-1; VA53_46-1; VA53_47-1; VA53_48-1; VA53_49-1; VA53_50-1; VA53_5-1; VA53_51-1; VA53_52-1; VA53_53-1; VA53_54-1; VA53_55-1; VA53_56-1; VA53_57-1; VA53_58-1; VA53_59-1; VA53_60-1; VA53_6-1; VA53_61-1; VA53_62-1; VA53_63-1; VA53_64-1; VA53_65-1; VA53_66-1; VA53_67-1; VA53_68-1; VA53_69-1; VA53_70-1; VA53_7-1; VA53_71-1; VA53_72-1; VA53_73-1; VA53_74-1; VA53_75-1; VA53_76-1; VA53_77-1; VA53_78-1; VA53_79-1; VA53_80-1; VA53_8-1; VA53_81-1; VA53_82-1; VA53_83-1; VA53_84-1; VA53_85-1; VA53_86-1; VA53_87-1; VA53_88-1; VA53_89-1; VA53_90-1; VA53_9-1; VA53_91-1; VA53_92-1; VA53_93-1; VA53_94-1; VA53_95-1; VA53_96-1; VA53_97-1; VA53_98-1; VA53_99-1; Valdivia (1961); ZISCH
    Type: Dataset
    Format: application/zip, 21 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
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