Interhemispheric appraisal of the value of alkenone indices as temperature and salinity proxies in high‐latitude locations

DOI Web Site Web Site 被引用文献10件

書誌事項

公開日
1998-12
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/98pa02355
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Alkenone sediment data from the Nordic seas and North Atlantic are compared to those from <jats:italic>Sikes et al.</jats:italic>[1997] for the Southern Ocean to evaluate further U<jats:sup>K</jats:sup><jats:sub>37</jats:sub> and U<jats:sup>K</jats:sup><jats:sub>37′</jats:sub> as proxies to estimate cold temperatures (<10°C) and the effect of salinity and temperature in the relative abundance of 37∶4 to the total abundance of C<jats:sub>37</jats:sub> alkenones (37∶4%). U<jats:sup>K</jats:sup><jats:sub>37</jats:sub> and U<jats:sup>K</jats:sup><jats:sub>37′</jats:sub> are found to be equally viable as proxies, but there are significant regional differences in their cold temperature dependence. The measurement of 37∶4% in cores from the North Atlantic region can be used to identify situations when U<jats:sup>K</jats:sup><jats:sub>37′</jats:sub> is not a reliable paleothermometer. Variations in salinity are probably responsible for changes in the sedimentary record of 37∶4%, and a preliminary calibration has been obtained for 37:4%=<jats:italic>f</jats:italic>(salinity). This new relationship should be further confirmed through field or laboratory experiments, but it paves the way to derive a molecular proxy to reconstruct paleosalinity in surface waters.</jats:p>

収録刊行物

  • Paleoceanography

    Paleoceanography 13 (6), 694-703, 1998-12

    American Geophysical Union (AGU)

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