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  • 1
    Monographie ausleihbar
    Monographie ausleihbar
    Annual records of tropical systems (ARTS) : recommendations for research (1999)
    Selbstverlag
    Details Verfügbarkeit
    Signatur: PIK N 453-02-0295
    Materialart: Monographie ausleihbar
    Seiten: 72 p.
    ISBN: 3952107883
    Serie: PAGES Workshop Report, Series 99-1
    Standort: A 18 - Bitte bestellen
    Zweigbibliothek: PIK Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
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    BUCH
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  • 2
    Digitale Medien
    Digitale Medien
    Global change Leads, lags and the tropics (2003)
    [s.l.] : Nature Publishing Group
    Nature 421 (2003), S. 121-122 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Assessing how events in the tropics drive or amplify climate change has become a central issue for understanding climate in the past and predicting its future course. But there has been all too little information to go on. The instrumental record from these, the warmest parts of our planet, is ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/421121a
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    El Niño Clues from corals (2000)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 407 (2000), S. 956-959 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Weather forecasters now enjoy increasingly accurate predictions of climate events linked to the El Niño/Southern Oscillation system (ENSO), ranging from powerful hurricanes in the Atlantic to devastating droughts in southern Africa and Indonesia. Lead times of up to a year can make a big ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/35039661
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 4
    Digitale Medien
    Digitale Medien
    Paleochemistry of manganese in corals from the Galapagos Islands (1991)
    Springer
    Coral reefs 10 (1991), S. 91-100 
    Details
    ISSN: 1432-0975
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie
    Notizen: Abstract Approximately 550 measurements of Mn/Ca ratios in three corals from the western Galapagos Islands have been performed to reconstruct a 380-year history of surface ocean variability with respect to this trace element. The time period studied encompasses 1600 A.D. to 1978. Manganese is inferred to be lattice-bound in coralline aragonite at 10–50% of its seawater proportion to calcium; uncertainty about the distribution coefficient stems from inherent variability of oceanic Mn in nearshore settings. Interannual variations at Urvina Bay, Isabela Island are generally small, with the exception of a few decades during the nineteenth century. A large positive Mn/Ca anomaly found between 1821–1830 is hypothesized to have resulted from a major volcanic eruption on nearby Fernandina Island in 1825. On intrannual timescales a pronounced cycle occurs in response to seasonal upwelling. Quarterly changes in Mn/Ca are six months out-of-phase with Cd/Ca variations-a reflection of the opposite distributions of these metals in the upper waters of the eastern Pacific. High frequency reconstructions over brief time intervals from the 17th, 18th, and 20th century reveal that the seasonal onset of warm and cool phases near Galapagos has persisted for at least 340 years. A quantitative assessment of historical changes in upwelling intensity is complicated by offsets in background Mn levels recorded by different corals. One apparent longterm feature is an overall decline in skeletal Mn concentrations from 1600–1978 which results in a net decrease of 20–30%. Several possible explanations exist for this trend, ranging from accumulation of a persistent diagenetic Mn phase in fossil aragonite to a temporal shift in oceanic/atmospheric Mn fluxes reaching the surface waters of the Galapagos Islands.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00571827
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Stable isotopes in a branching coral monitor seasonal temperature variation (1981)
    [s.l.] : Nature Publishing Group
    Nature 293 (1981), S. 453-455 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Thus far, most studies of isotopic and chemical variation in hermatypic corals, and all studies of seasonal isotopic variation, have involved species with massive growth habits, partly because such corals often produce annual24 dense bands which can be used as time markers. For examination of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/293453a0
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  • 6
    facet.materialart.
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    Physical oceanography during Nathaniel B. Palmer cruises NBP06-01 and NBP06-08 to the Ross Sea (2011)
    PANGAEA
    In:  Supplement to: Long, Matthew C; Dunbar, Robert B; Tortell, Philippe Daniel; Smith, Walker O Jr; Mucciarone, David A; DiTullio, Giacomo R (2011): Vertical structure, seasonal drawdown, and net community production in the Ross Sea, Antarctica. Journal of Geophysical Research, 116(C10), C10029, https://doi.org/10.1029/2009JC005954
    Details
    Publikationsdatum: 2023-12-13
    Beschreibung: We calculate net community production (NCP) during summer 2005-2006 and spring 2006 in the Ross Sea using multiple approaches to determine the magnitude and consistency of rates. Water column carbon and nutrient inventories and surface ocean O2/Ar data are compared to satellite-derived primary productivity (PP) estimates and 14C uptake experiments. In spring, NCP was related to stratification proximal to upper ocean fronts. In summer, the most intense C drawdown was in shallow mixed layers affected by ice melt; depth-integrated C drawdown, however, increased with mixing depth. Delta O2/Ar-based methods, relying on gas exchange reconstructions, underestimate NCP due to seasonal variations in surface Delta O2/Ar and NCP rates. Mixed layer Delta O2/Ar requires approximately 60 days to reach steady state, starting from early spring. Additionally, cold temperatures prolong the sensitivity of gas exchange reconstructions to past NCP variability. Complex vertical structure, in addition to the seasonal cycle, affects interpretations of surface-based observations, including those made from satellites. During both spring and summer, substantial fractions of NCP were below the mixed layer. Satellite-derived estimates tended to overestimate PP relative to 14C-based estimates, most severely in locations of stronger upper water column stratification. Biases notwithstanding, NCP-PP comparisons indicated that community respiration was of similar magnitude to NCP. We observed that a substantial portion of NCP remained as suspended particulate matter in the upper water column, demonstrating a lag between production and export. Resolving the dynamic physical processes that structure variance in NCP and its fate will enhance the understanding of the carbon cycling in highly productive Antarctic environments.
    Schlagwort(e): International Polar Year (2007-2008); IPY
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 7
    facet.materialart.
    Unbekannt
    Biosiliceous sedimentation at ODP Site 128-798 (1992)
    PANGAEA
    In:  Supplement to: Dunbar, Robert B; deMenocal, Peter B; Burckle, Lloyd H (1992): Late Pliocene-Quaternary biosiliceous sedimentation at Site 798, Japan Sea. In: Pisciotto, KA; Ingle, JCJr.; von Breymann, MT; Barron, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 127/128(1), 439-455, https://doi.org/10.2973/odp.proc.sr.127128-1.147.1992
    Details
    Publikationsdatum: 2024-01-09
    Beschreibung: Upper Pliocene through Holocene sediments recovered at Site 798 in the Japan Sea (Oki Ridge) exhibit rhythmic variation in weight percent biogenic opal at intervals of ~5 m and periods equivalent to the 41-k.y. obliquity cycle. Variance at 17 and 100 k.y. is observed prior to 1.3 Ma. These cycles are also clearly defined by log data and correspond to clusters of decimeter-scale dark-colored sediment units alternating with clusters of light-colored units. Opal content varies between 3% and 22% between 0 and 1.3 Ma and from 3% to 43% between 1.3 and 2.6 Ma. Long-term opal accumulation rates average 1.8 g/cm**2/k.y. in the late Pliocene/early Pleistocene and decrease by about 60% at ~1.3 Ma. Rough calculations suggest that opal accumulation rates increased and terrigenous flux decreased during the Holocene relative to the last glacial period. Our age control is not yet sufficient to allow a similar analysis of the 41-k.y. cyclicity in opal content throughout the Pleistocene. Stable isotope results from planktonic foraminifers confirm previous suggestions of a strong surface-water freshening event during isotope stage 2; however, this episode appears to be unique during the Pleistocene. Benthic foraminifers are depleted in 18O during parts of glacial stages 2 and 6 relative to adjacent interglacials, suggesting unusual warming and/or freshening of deep waters. Collectively, the stable isotope and %opal data are consistent with continuing isolation of the Japan Sea during the Quaternary with important transitions occurring at 1.3, 0.7 to 1.0, and 0.2 to 0.3 Ma. Complex relationships among the stable isotope results, %opal data, and sediment characteristics such as color and organic and inorganic carbon content preclude development of a simple model to explain cyclical sedimentation. Opal maxima occur within both light and dark intervals and the processes that control surface-water productivity are at times decoupled from the factors that regulate deep-water dysaerobia. We suggest that water column overturn is controlled largely by regional atmospheric circulation that must also have an as yet poorly understood effect on surface-water fertility.
    Schlagwort(e): 128-798; 128-798A; 128-798B; 128-798C; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Japan Sea; Joides Resolution; Leg128; Ocean Drilling Program; ODP
    Materialart: Dataset
    Format: application/zip, 3 datasets
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    DATEN PANGAEA
  • 8
    facet.materialart.
    Unbekannt
    Organic matter C and N composition and N. pachyderma stable isotope ratios of ODP Hole 188-1166A sediments (2003)
    PANGAEA
    In:  Supplement to: Theissen, Kevin M; Dunbar, Robert B; Cooper, Alan K (2003): Data report: Stable isotopic measurements of sedimentary organic matter and N. pachyderma (s.) from Site 1166, Prydz Bay continental shelf. In: Cooper, AK; O'Brien, PE; Richter, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 188, 1-11, https://doi.org/10.2973/odp.proc.sr.188.005.2003
    Details
    Publikationsdatum: 2024-01-09
    Beschreibung: We report the results of downhole stable isotopic (d13Corg [organic carbon] and d15N) and elemental measurements (total organic carbon [TOC], total nitrogen [TN], and carbon/nitrogen [C/N]) of sedimentary organic matter (SOM) along with stable isotopic measurements (d18O and d13C) of left-coiling Neogloboquadrina pachyderma planktonic foraminifers from Ocean Drilling Program Site 1166. TOC and TN measurements indicate a large change from organic-rich preglacial sediments with primary organic matter to organic-poor early glacial and glacial sediments, with mainly recycled organic matter. Results of the stable isotopic measurements of SOM show a range of values that are typical of both marine and terrestrial organic matter, probably reflecting a mixture of the two. However, C/N values are mostly high (〉15), suggesting greater input and/or preservation of terrestrial organic matter. Foraminifers are only present in glacial/glaciomarine sediments of latest Pliocene to Pleistocene age at Site 1166 (lithostratigraphic Unit I). The majority of this unit has d13Corg and TOC values that are similar to those of glacial sediments recovered at Site 1167 (lithostratigraphic Unit II) on the slope and may have the same source(s). Although the low resolution of the N. pachyderma (s.) d18O and d13C data set precludes any specific paleoclimatic interpretation, downcore variations in foraminifer d18O and d13C values of 0.5 per mil to 1 per mil amplitude may indicate glacial-interglacial changes in ice volume/temperature in the Prydz Bay region.
    Schlagwort(e): 188-1166A; DRILL; Drilling/drill rig; Joides Resolution; Leg188; Ocean Drilling Program; ODP; Prydz Bay
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
  • 9
    facet.materialart.
    Unbekannt
    (Table 1) Concentration of iron, DIP and silicic acid in water samples taken during Nathaniel B. Palmer cruises NBP06-01 and NBP06-08 (CORSACS I+II), Ross Sea (2011)
    PANGAEA
    In:  Supplement to: Sedwick, Peter; Marsay, Christopher M; Sohst, Bettina M; Aguilar-Islas, Ana M; Lohan, Maeve C; Long, Matthew C; Arrigo, Kevin R; Dunbar, Robert B; Saito, Mak A; Smith, Walker O Jr; DiTullio, Giacomo R (2011): Early season depletion of dissolved iron in the Ross Sea polynya: Implications for iron dynamics on the Antarctic continental shelf. Journal of Geophysical Research, 116(C12), C12019, https://doi.org/10.1029/2010JC006553
    Details
    Publikationsdatum: 2023-12-13
    Beschreibung: The Ross Sea polynya is among the most productive regions in the Southern Ocean and may constitute a significant oceanic CO2 sink. Based on results from several field studies, this region has been considered seasonally iron limited, whereby a "winter reserve" of dissolved iron (dFe) is progressively depleted during the growing season to low concentrations (~0.1 nM) that limit phytoplankton growth in the austral summer (December-February). Here we report new iron data for the Ross Sea polynya during austral summer 2005-2006 (27 December-22 January) and the following austral spring 2006 (16 November-3 December). The summer 2005-2006 data show generally low dFe concentrations in polynya surface waters (0.10 ± 0.05 nM in upper 40 m, n = 175), consistent with previous observations. Surprisingly, our spring 2006 data reveal similar low surface dFe concentrations in the polynya (0.06 ± 0.04 nM in upper 40 m, n = 69), in association with relatively high rates of primary production (~170-260 mmol C/m**2/d). These results indicate that the winter reserve dFe may be consumed relatively early in the growing season, such that polynya surface waters can become "iron limited" as early as November; i.e., the seasonal depletion of dFe is not necessarily gradual. Satellite observations reveal significant biomass accumulation in the polynya during summer 2006-2007, implying significant sources of "new" dFe to surface waters during this period. Possible sources of this new dFe include episodic vertical exchange, lateral advection, aerosol input, and reductive dissolution of particulate iron.
    Schlagwort(e): Bottle, Niskin; CORSACS-1_NX1; CORSACS-1_NX10; CORSACS-1_NX11; CORSACS-1_NX2; CORSACS-1_NX3; CORSACS-1_NX4; CORSACS-1_NX5; CORSACS-1_NX6; CORSACS-1_NX7; CORSACS-1_NX8; CORSACS-1_NX9; CORSACS-2_NX12; CORSACS-2_NX13; CORSACS-2_NX14; CORSACS-2_NX15; CORSACS-2_NX16; CORSACS-2_NX17; CORSACS-2_NX18; CORSACS-2_NX19; CORSACS-2_NX20; CORSACS I; CORSACS II; DEPTH, water; Event label; International Polar Year (2007-2008); IPY; Iron, dissolvable; Iron, dissolved; Iron, particulate; Mixed layer depth; Nathaniel B. Palmer; NBP0601; NBP0601_NX1; NBP0601_NX10; NBP0601_NX11; NBP0601_NX2; NBP0601_NX3; NBP0601_NX4; NBP0601_NX5; NBP0601_NX6; NBP0601_NX7; NBP0601_NX8; NBP0601_NX9; NBP0608; NBP0608_NX12; NBP0608_NX13; NBP0608_NX14; NBP0608_NX15; NBP0608_NX16; NBP0608_NX17; NBP0608_NX18; NBP0608_NX19; NBP0608_NX20; NIS; Nitrate and Nitrite; Phosphorus, inorganic, dissolved; Ross Sea; Silicic acid
    Materialart: Dataset
    Format: text/tab-separated-values, 1365 data points
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    DATEN PANGAEA
  • 10
    facet.materialart.
    Unbekannt
    (Table 2) Accumulation rates of ODP Site 128-798 (1992)
    PANGAEA
    Details
    Publikationsdatum: 2024-01-09
    Schlagwort(e): 128-798; Accumulation rate, mass; Accumulation rate, opal; Accumulation rate, terrigenous; Age, maximum/old; Age, minimum/young; Calcium carbonate; COMPCORE; Composite Core; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Japan Sea; Joides Resolution; Leg128; Ocean Drilling Program; ODP; Opal, biogenic silica; Organic matter; Sedimentation rate
    Materialart: Dataset
    Format: text/tab-separated-values, 60 data points
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
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