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  • Books  (2)
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  • 1
    Monograph available for loan
    Monograph available for loan
    Carbon cycling in the glacial ocean : constraints on the ocean's role in global change ; quantitative approaches in paleoceanography (1994)
    Berlin : Springer
    Associated volumes
    Details Availability
    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
    URL: http://bvbr.bib-bvb.de:8991/exlibris/aleph/a22_1/apache_media/L6T6KYT1A33KF689QA8K2Y56N41KSN.pdf
    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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  • 2
    Monograph available for loan
    Monograph available for loan
    Paleoclimate, global change and the future : with 4 tables (2003)
    Berlin [u.a.] : Springer
    Details Availability
    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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  • 3
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    Water Mass Conversion in the Glacial Subarctic Pacific (54°N, 148°W): Physical Constraints and the Benthic-Planktonic Stable Isotope Record (1991)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 6 (5). pp. 543-560.
    Details
    Publication Date: 2018-03-02
    Description: Benthic (Uvigerina spp., Cibicidoides spp., Gyroidinoides spp.) and planktonic (N. pachyderma sinistral, G. bulloides) stable isotope records from three core sites in the central Gulf of Alaska are used to infer mixed-layer and deepwater properties of the late glacial Subarctic Pacific. Glacial-interglacial amplitudes of the planktonic δ18O records are 1.1–1.3‰, less than half the amplitude observed at core sites at similar latitudes in the North Atlantic; these data imply that a strong, negative δw anomaly existed in the glacial Subarctic mixed layer during the summer, which points to a much stronger low-salinity anomaly than exists today. If true, the upper water column in the North Pacific would have been statically more stable than today, thus suppressing convection even more efficiently. This scenario is further supported by vertical (i.e., planktic versus benthic) δ18O and δ13C gradients of 〉1‰, which suggest that a thermohaline link between Pacific deep waters and the Subarctic Pacific mixed layer did not exist during the late glacial. Epibenthic δ13C in the Subarctic Pacific is more negative than at tropical-subtropical Pacific sites but similar to that recorded at Southern Ocean sites, suggesting ventilation of the deep central Pacific from mid-latitude sources, e.g., from the Sea of Japan and Sea of Okhotsk. Still, convection to intermediate depths could have occurred in the Subarctic during the winter months when heat loss to the atmosphere, sea ice formation, and wind-driven upwelling of saline deep waters would have been most intense. This would be beyond the grasp of our planktonic records which only document mixed-layer temperature-salinity fields extant during the warmer seasons. Also we do not have benthic isotope records from true intermediate water depths of the Subarctic Pacific.
    Type: Article , PeerReviewed
    Format: text
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  • 4
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    Stratification-induced variations in nutrient utilization in the Polar North Atlantic during past interglacials (2017)
    Elsevier
    In:  Earth and Planetary Science Letters, 457 . pp. 127-135.
    Details
    Publication Date: 2020-08-14
    Description: Highlights • A thin mixed-layer and a strongly stratified upper-water characterized MIS 1. • A thick mixed-layer prevailed during MIS 11 and reduced nitrate utilization. • These contrasting results explain the weak expression of MIS 11 in the polar latitudes. • Caution is needed when using older interglacials as near-future climate analogues. Abstract Vertical water mass structure in the Polar North Atlantic Ocean plays a critical role in planetary climate by influencing the formation rate of North Atlantic deepwater, which in turn affects surface heat transfer in the northern hemisphere, ventilation of the deep sea, and ocean circulation on a global scale. However, the response of upper stratification in the Nordic seas to near-future hydrologic forcing, as surface water warms and freshens due to global temperature rise and Greenland ice demise, remains poorly known. While past major interglacials are viewed as potential analogues of the present, recent findings suggest that very different surface ocean conditions prevailed in the Polar North Atlantic during Marine Isotope Stage (MIS) 5e and 11 compared to the Holocene. It is thus crucial to identify the causes of those differences in order to understand their role in climatic and oceanographic variability. To resolve this, we pair here bulk sediment δ15N isotopic signatures with planktonic foraminiferal assemblages and their isotopic composition across major past interglacials. The comparison defines for the first time stratification-induced variations in nitrate utilization up to 25% between and within all of these warm periods that highlight changes in the thickness of the mixed-layer throughout the previous interglacials. That thickness directly controls the depth-level of Atlantic water inflow. The major changes of nitrate utilization recorded here thus suggest that a thicker mixed-layer prevailed during past interglacials, probably related to longer freshwater input associated with the preceding glacial termination. This would have caused the Atlantic water to flow at greater depth during MIS 5e and 11. These results call for caution when using older interglacials as modern or near-future climate analogues and contribute to the improvement of our general comprehension of the impact of freshwater input near a globally important deep-water formation site like the Nordic Seas. This is crucial when assessing the negative impacts on the Greenland Ice Sheet of climate change and global warming.
    Type: Article , PeerReviewed
    Format: text
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