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  • 1
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    The Mn/Ca ratio of planktonic foraminiferal calcite determined by flo-thru as a proxy for terrigenous input , carbon rain and mixed layer depth (2006)
    In:  [Other] In: AGU Fall Meeting 2006, 11.-15.12.2006, San Francisco, USA .
    Details
    Publication Date: 2017-02-17
    Description: The Mn/Ca ratio of the biogenic calcite preserved in deep-sea sediments has potential as a proxy for terrestrial input and other parameters related to the surface ocean and chemical redox. The underlying basis for this potential lies in features of the Mn cycle in the oceans, which are well known. The use of Mn and other elements as paleoproxies is complicated, however, by the formation of diagenetic carbonates. These overgrowths cause SST from Mg/Ca to be overestimated and obscure primary trace element signatures. Flo- thru addresses these issues by sorting phases by their susceptibility to dissolution and allowing us to examine sample homogeneity on a fine scale. This study uses a multi-proxy, multi-species approach to investigate changes in SST and Mn/Ca from 0-30 ky BP in the Panama Basin. We will show that the flo-thru compositions of surface-dwelling G. ruber and thermocline-dwelling N. dutertrei are consistent with their ecology. We will then contrast relative changes in the compositions of these species through time to develop a picture of systematic changes in surface water from the LGM to present. Preliminary results indicate less terrigenous input, greater carbon rain, and a deeper mixed layer in the Panama Basin at the LGM relative to present.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 2
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    Eastern Pacific warm pool paleosalinity and climate varibability: 0- 30 Kyr (2006)
    AGU (American Geophysical Union)
    In:  Paleoceanography, 21 (PA3008).
    Details
    Publication Date: 2017-05-10
    Description: Multiproxy geologic records of δ18O and Mg/Ca in fossil foraminifera from sediments under the Eastern Pacific Warm Pool (EPWP) region west of Central America document variations in upper ocean temperature, pycnocline strength, and salinity (i.e., net precipitation) over the past 30 kyr. Although evident in the paleotemperature record, there is no glacial-interglacial difference in paleosalinity, suggesting that tropical hydrologic changes do not respond passively to high-latitude ice sheets and oceans. Millennial variations in paleosalinity with amplitudes as high as ∼4 practical salinity units occur with a dominant period of ∼3–5 ky during the glacial/deglacial interval and ∼1.0–1.5 ky during the Holocene. The amplitude of the EPWP paleosalinity changes greatly exceeds that of published Caribbean and western tropical Pacific paleosalinity records. EPWP paleosalinity changes correspond to millennial-scale climate changes in the surface and deep Atlantic and the high northern latitudes, with generally higher (lower) paleosalinity during cold (warm) events. In addition to Intertropical Convergence Zone (ITCZ) dynamics, which play an important role in tropical hydrologic variability, changes in Atlantic-Pacific moisture transport, which is closely linked to ITCZ dynamics, may also contribute to hydrologic variations in the EPWP. Calculations of interbasin salinity average and interbasin salinity contrast between the EPWP and the Caribbean help differentiate long-term changes in mean ITCZ position and Atlantic-Pacific moisture transport, respectively.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2005PA001208
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Constraints on the magnitude and patterns of ocean cooling at the Last Glacial Maximum (2009)
    In:  EPIC3Nature Geoscience, 2, pp. 127-132
    Details
    Publication Date: 2016-03-15
    Description: Observation-based reconstructions of sea surface temperature from relatively stable periods in the past, such as the Last Glacial Maximum, represent an important means of constraining climate sensitivity and evaluating model simulations1. The first quantitative global reconstruction of sea surface temperatures during the Last Glacial Maximum was developed by the Climate Long-Range Investigation, Mapping and Prediction (CLIMAP) project in the 1970s and 1980s (refs 2, 3). Since that time, several shortcomings of that earlier effort have become apparent4. Here we present an updated synthesis of sea surface temperatures during the Last Glacial Maximum, rigorously defined as the period between 23 and 19 thousand years before present, from the Multiproxy Approach for the Reconstruction of the Glacial Ocean Surface (MARGO) project5. We integrate microfossil and geochemical reconstructions of surface temperatures and include assessments of the reliability of individual records. Our reconstruction reveals the presence of large longitudinal gradients in sea surface temperature in all of the ocean basins, in contrast to the simulations of the Last Glacial Maximum climate available at present
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
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    Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum (2005)
    PERGAMON-ELSEVIER SCIENCE LTD
    In:  EPIC3Quaternary Science Reviews, PERGAMON-ELSEVIER SCIENCE LTD, 24(7-9), pp. 821-834, ISSN: 0277-3791
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/vnd.ms-excel
    Format: application/vnd.ms-excel
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