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Impact of lateral transport on organic proxies in the Southern Ocean

Published online by Cambridge University Press:  20 January 2017

Jung-Hyun Kim*
Affiliation:
Royal Netherlands Institute for Sea Research (NIOZ), Department of Marine Organic Biogeochemistry, PO Box 59, 1790 AB Den Burg, Texel, The Netherlands
Xavier Crosta
Affiliation:
EPOC-UMR 5805, Université de Bordeaux 1, Avenue des Facultés, 33405 Talence Cedex, France
Elisabeth Michel
Affiliation:
Laboratoire des Sciences du Climat et de l’Environnement, CNRS, Gif-sur-Yvette, France
Stefan Schouten
Affiliation:
Royal Netherlands Institute for Sea Research (NIOZ), Department of Marine Organic Biogeochemistry, PO Box 59, 1790 AB Den Burg, Texel, The Netherlands
Josette Duprat
Affiliation:
EPOC-UMR 5805, Université de Bordeaux 1, Avenue des Facultés, 33405 Talence Cedex, France
Jaap S. Sinninghe Damsté
Affiliation:
Royal Netherlands Institute for Sea Research (NIOZ), Department of Marine Organic Biogeochemistry, PO Box 59, 1790 AB Den Burg, Texel, The Netherlands
*
Corresponding author. Fax: +31 0 222 319674. Email Address:jhkim@nioz.nl (J.-H. Kim).

Abstract

Lateral transport of fine-grained organic carbon particles can complicate the interpretation of paleoclimate records based on organic proxies. Here we investigated the effect of lateral transport on newly developed temperature and soil organic matter proxies, TEX86 and BIT index, respectively, in core MD88–769 recovered from the South East Indian Ridge. Our results show that TEX86 and BIT records in comparison to diatom and foraminifera records were representative for more local climate changes while alkenones and n-alkanes originated from distant areas by oceanic and atmospheric transport, respectively. This suggests that TEX86 and BIT paleoclimate records are primarily influenced by local conditions and less subjected to long-distance lateral transport than other organic proxies in the Southern Ocean.

Type
Short paper
Copyright
University of Washington

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