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  • 1
    Monograph available for loan
    Monograph available for loan
    Berlin [u.a.] : Springer
    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: D.4.
    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
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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: 2020-01-17
    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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  • 4
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    PANGAEA
    In:  Supplement to: de Vernal, Anne; Pedersen, Thomas F (1997): Micropaleontology and palynology of core PAR87A-10: A 23,000 year record of paleoenvironmental changes in the Gulf of Alaska, northeast North Pacific. Paleoceanography, 12(6), 821-830, https://doi.org/10.1029/97PA02167
    Publication Date: 2020-01-17
    Description: Micropaleontological data of core PAR87A-10 reveal that the last glacial interval, prior to 13 ka, was marked by low biogenic fluxes and poor CaCO3 preservation. Quantitative estimates of sea-surface conditions based on dinocyst assemblages suggest that cold temperatures and freezing winter conditions existed during this period. The glacial to interglacial transition, i.e., the 13–8 ka interval, was characterized by an increase in fluxes of microfossils indicating enhanced productivity in surface waters. A higher biogenic carbonate production probably resulted in better preservation of CaCO3. This interval was marked by relatively low salinity and by sea-surface temperatures increasing toward modern values. Relatively high pollen flux during the transition suggests nutrient inputs through atmospheric and/or fluvial transport from the adjacent North American continent. After 8 ka, diminished fluxes of plankton, concomitant with a decline in pollen input, are associated with decreasing nutrient supply as predominantly eastward winds became established over the North Pacific.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 5
    Publication Date: 2020-01-17
    Type: Dataset
    Format: text/tab-separated-values, 136 data points
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  • 6
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    PANGAEA
    In:  Supplement to: Hendy, Ingrid L; Pedersen, Thomas F; Kennett, James P; Tada, Ryuji (2004): Intermittent existence of a southern Californian upwelling cell during submillennial climate change of the last 60 kyr. Paleoceanography, 19(3), PA3007, https://doi.org/10.1029/2003PA000965
    Publication Date: 2020-01-17
    Description: Application of a high-resolution multiproxy approach to a sedimentary section drilled at Ocean Drilling Program Site 1017, located under a highly active upwelling cell off Point Conception, California, provides clear evidence for surface ocean productivity shifts on submillennial timescales during the last 60 kyr. The proxies include bulk-sediment major and minor elements, organic carbon and carbonate concentrations, d15N, and planktonic foraminiferal species assemblage and carbon isotope determinations. The collective results demonstrate that marine productivity in this area was not simply linearly related to cold and warm cycles except during the millennial-scale climate oscillations of marine isotope stage (MIS) 3. During that interval, the upwelling cell and resulting high productivity were active during warm interstadial events and were largely inactive during cool stadial events. However, the Last Glacial Maximum was also relatively productive. Productivity increased dramatically during the Bølling warm interval, while the Ållerød and Younger Dryas were much less productive. High coccolithophorid abundance commenced during the earliest Holocene after 10 ka. The complexity of the productivity response was probably related to interplay between local winds, as well as California Undercurrent strength.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 7
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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: 2020-01-17
    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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  • 8
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    PANGAEA
    In:  Supplement to: Oba, Tadamichi; Pedersen, Thomas F (1999): Paleoclimatic Significance of Eolian Carbonates Supplied to the Japan Sea during the Last Glacial Maximum. Paleoceanography, 14(1), 34-41, https://doi.org/10.1029/98PA02507
    Publication Date: 2020-01-17
    Description: Laminated sediments deposited under anoxic bottom waters in the Japan Sea during the last glacial maximum (LGM) contain extremely well preserved calcareous microfossils and eolian carbonates. The radiocarbon age-difference between bulk sediment and monospecific planktonic foraminifera in discrete laminae from a core in the southern Japan Sea implies that ~40% of the total carbonates in the sediments at the LGM are of eolian origin. Extrapolation of this result yields a rate of supply of eolian carbonates of ~2800 tons/d to the entire Japan Sea during the LGM. The climatic significance of this flux potentially lies in its broader geographic extension, particularly in the interaction of the carbonate-bearing dust with shallow, corrosive North Pacific waters and with rain in the atmosphere. By increasing the alkalinity of such waters and by enhancing the biological pump the dust flux could have increased CO2 absorption by both the ocean and rain during the LGM.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 9
    Publication Date: 2020-01-17
    Type: Dataset
    Format: text/tab-separated-values, 18 data points
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  • 10
    Publication Date: 2020-01-17
    Type: Dataset
    Format: text/tab-separated-values, 440 data points
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