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Paleoproductivity evolution off central Chile from the Last Glacial Maximum to the Early Holocene

Published online by Cambridge University Press:  20 January 2017

Oscar E. Romero ,
Jung-Hyn Kim  and
Dierk Hebbeln
Oscar E. Romero*
Affiliation:
Department of Geosciences, University Bremen, PO Box 330440, 28334 Bremen, Germany
Jung-Hyn Kim
Affiliation:
Department of Geosciences, University Bremen, PO Box 330440, 28334 Bremen, Germany
Dierk Hebbeln
Affiliation:
Department of Geosciences, University Bremen, PO Box 330440, 28334 Bremen, Germany
*
*Corresponding author. E-mail address:oromero@uni-bremen.de (O.E. Romero).
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Abstract

A geochemical and paleontological reconstruction of paleoproductivity, upwelling intensity and sea surface temperature (SST) off central Chile at 35°S (GeoB3359-3) reveals marked changes from the Last Glacial Maximum (LGM) through the Early Holocene. Surface-water productivity was determined by the interaction between the atmospheric (the Southern Westerlies) and oceanographic (the Antarctic Circumpolar Current, ACC) systems from the LGM through early Termination I (TI). The northward shift of the climate zones during the LGM brought the ACC, as the main macronutrient source, closer to the GeoB3359-3, SST lowered, and surface water productivity and accumulation rates of biogenic components enhanced. With the poleward return of the Southern Westerlies and the ACC, the subtropical high-pressure system became the dominant atmospheric component southward till 35°S during the late TI and Early Holocene and caused surface water productivity to increase through enhanced upwelling.

Keywords

DeglaciationDiatomsHoloceneLast Glacial MaximumPaleoproductivityPeru-Chile CurrentSea-surface temperaturesUpwelling
Type
Research Article
Information
Quaternary Research , Volume 65 , Issue 3 , May 2006 , pp. 519 - 525
Copyright
University of Washington

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