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  • 1
    Call number: 12/M 03.0295
    Type of Medium: Monograph available for loan
    Pages: XIV, 220 S.
    ISBN: 3540424024
    Series Statement: Global change - the IGBP series
    Classification:
    Meteorology and Climatology
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Call number: AWI G5-96-0326
    In: NATO ASI series : I, Global and environmental change, Vol. 17
    Type of Medium: Monograph available for loan
    Pages: XII, 580 Seiten , Illustrationen
    ISBN: 3540575944
    Series Statement: NATO ASI series : I, Global and environmental change 17
    Language: English
    Note: TABLE OF CONTENTS FOREWORD LIST OF AUTHORS AND PARTICIPANTS I - OPERATION OF THE OCEAN-ATMOSPHERE CARBON CYCLE The recent state of carbon cycling through the atmosphere / I. Levin Glacial ocean carbon cycle modeling / Ch. Heinze Glacial-interglacial changes in continental weathering: possible implication for atmospheric CO2 / G. Munhoven and L.M.François II - VARIATIONS OF THE OCEANS CARBON RESERVOIR: FAUNAL VERSUS GEOCHEMCAL RECORDS The relationship between surface water masses, oceanographic fronts and paleoclimatic proxies in surface sediments of the Greenland, Iceland, Norwegian Seas / T. Johannessen, E. Jansen, A. Flatrøy, A. C. Ravelo. - Is there a relationship between atmospheric CO2 and manganese in the ocean? / A. Mangini, H.-J. Rutsch, M. Frank, A. Eisenhauer, J.-D. Eckhardt Benthic foraminiferal assemblages and the δ13C-signal in the Atlantic sector of the Southern Ocean: glacial-to-interglacial contrasts / A. Mackensen, H. Grobe, H.-W. Hubberten, G. Kuhn Foraminiferal population dynamics and stable carbon isotopes / Ch. Hemleben and J. Bijma A comparison of carbon isotopes and cadmium in the modern and glacial maximum ocean: can we account for the discrepancies? / E. A. Boyle Tracer-nutrient correlations in the upper ocean: observational and box model constraints on the use of benthic foraminiferal δ13C and Cd/Ca as paleo-proxies for the intermediate-depth ocean / R. Zahn and R. Keir IIΙ - GEOCHEMISTRY OF THE ORGANIC SEDIMENT FRACTION: CONSTRAINTS ON THE BIOLOGICAL CARBON PUMP Possible early diagenetic alteration of palaeo proxies / G.J. De Lange, B. Van Os, P.A. Pruysers, J.J. Middelburg, D. Castradori, P. Van Santvoort, P.J. Müller, H. Eggenkamp, F.G. Prahl Nitrogen isotope fractionation in the modern ocean: implications for the sedimentary record / J. P. Montoya The use of nitrogen isotopic ratio for reconstruction of past changes in surface ocean nutrient utilization / M.A. Altabet and R. Francois Variations in sedimentary organic δ13C as a proxy for past changes in ocean and atmospheric CO2 concentrations / G. H. Rau Reconstruction of paleoceanic PCO2 levels from carbon isotopic compositions of sedimentary biogenic components /J.P. Jasper and J.M. Hayes Late Quaternary PCO2 variations in the Angola Current: evidence from organic carbon δ13C and alkenone temperatures / P.J. Müller, R. Schneider, G. Ruhland PCO2 variations of equatorial surface water over the last 330,000 years: the δ13C record of organic carbon / L. Westerhausen, M. Sarnthein, U. Struck, H. Erlenkeuser, J. Poynter IV - GEOCHEMICAL AND MICROPALEONTOLOGICAL INDEXES OF PALEO-PRODUCTIVITY Paleoproductivity: flux proxies versus nutrient proxies and other problems concerning the Quaternary productivity record / W.H. Berger, J.C. Herguera, C.B. Lange, R. Schneider From modern flux to paleoflux: assessment from sinking assemblages to thanatocoenosis / K. Takahashi Late Quaternary paleoproductivity variations in the NE and equatorial Atlantic: diatom and Corg evidence / F. Abrantes, K. Winn, M. Sarnthein Glacial-Holocene paleoproductivity off western Australia: a comparison of proxy records / D.C. McCorkle, H. H. Veeh, D.J. Heggie Nutrient, mixing and export indices: A 250 Kyr paleoproductivity record from the western equatorial Pacific / J.C. Herguera Dinoflagellate cysts as paleoproductivity indicators: state of the art, potential, and limits / B. Dale and A. Fjeliså Deep-sea benthic foraminifers: food and bottom water masses / D. Schnitker The history of barium, biogenic silica and organic carbon accumulation in the Weddell Sea and Antarctic Ocean over the last 150,000 years / G. Shimmield, S. Derrick, A. Mackensen, H. Grobe, C. Pudsey SUBJECT INDEX
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Atmospheric carbon dioxide concentrations were significantly lower during glacial periods than during intervening interglacial periods, but the mechanisms responsible for this difference remain uncertain. Many recent explanations call on greater carbon storage in a poorly ventilated deep ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillian Magazines Ltd.
    Nature 401 (1999), S. 779-782 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The surface waters of the modern subarctic Pacific Ocean are isolated from the nutrient-rich waters below by a steep vertical gradient in salinity (halocline), a feature which is a dominant control on upper-ocean stratification in polar environments. The physical processes which maintain the ...
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To explain the lower atmospheric CO2 concentrations during glacial periods, it has been suggested that the productivity of marine phytoplankton was stimulated by an increased flux of iron-bearing dust to the oceans. One component of this theory is that iron—an essential ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 376 (1995), S. 755-758 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Water-column denitrification accounts for almost half (60-QOTgNyr™1) of the total oceanic loss of fixed nitrogen and occurs primarily in three areas: the eastern tropical North Pacific (ETNP), the eastern tropical South Pacific and the Arabian Sea4 6. Each of these regions is ...
    Type of Medium: Electronic Resource
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  • 7
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    PANGAEA
    In:  Supplement to: Pichevin, Laetitia; Ganeshram, Raja S; Francavilla, Stephen; Arellano-Torres, Elsa; Pedersen, Thomas F; Beaufort, Luc (2010): Interhemispheric leakage of isotopically heavy nitrate in the eastern tropical Pacific during the last glacial period. Paleoceanography, 25(1), PA1204, https://doi.org/10.1029/2009PA001754
    Publication Date: 2023-05-12
    Description: We present new high-resolution N isotope records from the Gulf of Tehuantepec and the Nicaragua Basin spanning the last 50-70 ka. The Tehuantepec site is situated within the core of the north subtropical denitrification zone while the Nicaragua site is at the southern boundary. The d15N record from Nicaragua shows an 'Antarctic' timing similar to denitrification changes observed off Peru-Chile but is radically different from the northern records. We attribute this to the leakage of isotopically heavy nitrate from the South Pacific oxygen minimum zone (OMZ) into the Nicaragua Basin. The Nicaragua record leads the other eastern tropical North Pacific (ETNP) records by about 1000 years because denitrification peaks in the eastern tropical South Pacific (ETSP) before denitrification starts to increase in the Northern Hemisphere OMZ, i.e., during warming episodes in Antarctica. We find that the influence of the heavy nitrate leakage from the ETSP is still noticeable, although attenuated, in the Gulf of Tehuantepec record, particularly at the end of the Heinrich events, and tends to alter the recording of millennial timescale denitrification changes in the ETNP. This implies (1) that sedimentary d15N records from the southern parts of the ETNP cannot be used straightforwardly as a proxy for local denitrification and (2) that denitrification history in the ETNP, like in the Arabian Sea, is synchronous with Greenland temperature changes. These observations reinforce the conclusion that on millennial timescales during the last ice age, denitrification in the ETNP is strongly influenced by climatic variations that originated in the high-latitude North Atlantic region, while commensurate changes in Southern Ocean hydrography more directly, and slightly earlier, affected oxygen concentrations in the ETSP. Furthermore, the d15N records imply ongoing physical communication across the equator in the shallow subsurface continuously over the last 50-70 ka.
    Keywords: IMAGES; International Marine Global Change Study
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 8
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    PANGAEA
    In:  Supplement to: Kienast, Stephanie S; Calvert, Stephen E; Pedersen, Thomas F (2002): Nitrogen isotope and productivity variations along the northeast Pacific margin over the last 120 kyr: Surface and subsurface paleoceanography. Paleoceanography, 17(4), 1055, https://doi.org/10.1029/2001PA000650
    Publication Date: 2023-05-12
    Description: Glacial-interglacial changes in sedimentary d15N over the last 120 kyr display a remarkably similar pattern in timing and amplitude in core records extending from the denitrification zone in the eastern tropical North Pacific (ETNP), where subsurface denitrification is active, to the Oregon margin, where no denitrification occurs today. Low d15N values (4-6 per mil) generally characterize glacial stages 2 and 4, and higher d15N values (7-10 per mil) are representative of the Holocene, millennial-scale periods within stage 3, and stage 5. The inferred synchroneity of d15N variations along the entire margin implies that the nitrate isotopic signal produced in the oxygen-poor subsurface waters in the ETNP is rapidly advected northward and recorded at sites far beyond the boundaries of the modern denitrification zone. Similar to d15N, primary production indicators (percent Corg, Ba/Al, and percent opal) show glacial-interglacial as well as millennial-scale variations along the NE Pacific margin, with higher primary production during warm periods. However, the relative phasing between d15N and paleoproduction tracers within individual records changes latitudinally. Whereas d15N and primary production vary approximately synchronously in the midlatitudes, production lags d15N in the ETNP by several kiloyears. This lag calls for a new understanding of the processes driving denitrification in the ETNP. We suggest that oxygen input by the Equatorial Undercurrent as well as local organic matter flux controls denitrification rates in the ETNP. Moreover, the differences in relative timing point to a time-transgressive development of upwelling-favorable winds along the NE Pacific margin after the last glaciation, with those in the north developing several kiloyears earlier.
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 9
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    PANGAEA
    In:  Supplement to: Ganeshram, Raja S; Pedersen, Thomas F (1998): Glacial-interglacial variability in upwelling and bioproductivity off NW Mexico: Implications for Quaternary paleoclimate. Paleoceanography, 13(6), 634-645, https://doi.org/10.1029/98PA02508
    Publication Date: 2023-05-12
    Description: Sedimentary accumulation of biogenic components (organic carbon, opal, and biogenic barium) on the northwestern Mexican margin declined during every glacial interval of the past 140 kyr, indicating decreases in upwelling-induced productivity during cold periods. The glacial-interglacial contrasts in upwelling on this margin are attributed to reversals in land-ocean thermal contrast, the waxing and waning of the Laurentide Ice Sheet, and consequent responses of the western hemisphere wind fields. This scenario is consistent with three independent lines of evidence: terrestrial paleoclimatic data, general circulation model results, and our marine records. This pattern of glacial-interglacial variability in upwelling off NW Mexico is opposite to that observed in other low-latitude and midlatitude upwelling areas, such as the eastern equatorial Pacific. These results add to a growing pool of observations that the response of oceanic upwelling to glacial climatic forcing has been regionally variable.
    Type: Dataset
    Format: application/zip, 13 datasets
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  • 10
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    PANGAEA
    In:  Supplement to: Pedersen, Thomas F; Nielsen, B; Pickering, Mark (1991): Timing of Late Quaternary productivity pulses in the Panama Basin and implications for atmospheric CO2. Paleoceanography, 6(6), 657-677, https://doi.org/10.1029/91PA02532
    Publication Date: 2023-05-12
    Description: High-resolution percent Corg and delta18Oforam records obtained from Panama Basin core Atlantis II 54-25PC and additional data from nearby core P7 show that enhanced burial of organic carbon has characterized every major glacial period for the last 500 kyr in that area. Both Corg concentration and mass accumulation rate profiles exhibit a sawtooth pattern with maxima occurring typically in the later stages of glacial periods. Comparison with dust records suggests that the carbon accumulation rate profile reflects both the upwelling history and a variable rate of iron input during the late Quaternary. The sawtooth character may derive from increased wind velocities and rates of upwelling during glacials which are indirectly related to ice volume (Sarnthein et al., 1988). The rapid decline in export production at the end of glacials in the equatorial Pacific may be attributed to the retreat of ice sheets (thus reduced wind velocities and upwelling) coupled with a coincident decline in atmospheric dust load and/or delivery rate. The Corg accumulation rate profiles do not correlate well with atmospheric CO2 records. For example, atmospheric CO2 was already at a minimum 40 kyr ago when production in the Panama Basin began increasing dramatically, commensurate with an increase in global dust levels. Using the relationship between the degree of photosynthetic fractionation and the concentration of free CO2 in the surface ocean postulated by Popp et al. (1989), delta13Corg measurements made on core P7 show that Panama Basin surface waters have been supplying CO2 to the atmosphere continually for at least the last 50 kyr. There is no evidence for a flux of CO2 into the surface ocean in this area at any time during this period despite the higher production. If the Panama Basin cores are representative of the eastern and central equatorial Pacific, then these observations weaken the influence on CO2 drawdown postulated for increased glacial productivity at low latitudes.
    Keywords: AT_II-054_25PC; ATII_USA; Atlantis II (1963); Core; CORE; P07; Panama Margin; PC; Piston corer
    Type: Dataset
    Format: application/zip, 2 datasets
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