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Chlorin accumulation rate as a proxy for Quaternary marine primary productivity

Nature volume 383, pages 63–65 (1996)Cite this article

Abstract

A KNOWLEDGE of past changes in the biological productivity of the oceans is important for understanding the interactions between carbon cycling and climate. Phytoplankton productivity in today's oceans can be estimated from the concentrations of chlorophyll in sea water1, but chlorophyll is not preserved in the sediments. Existing proxies for past algal productivity do not represent total productivity; for example, biogenic opal2 reflects the contribution of only part of the phytoplankton community, and the organic carbon record can be subject to contamination from terrestrial inputs2,3. Although chlorins, the pigment-transformation products of chlorophyll, are widespread in Quaternary marine sediments, their potential as proxy measures of past variations in primary productivity has not been convincingly demonstrated. Here we report a high-resolution molecular stratigraphic record of chlorin concentrations over the past 350,000 years in a sediment core from the subtropical Atlantic continental margin. Maxima in the chlorin accumulation rate coincide with significant peaks in the accumulation rates of biogenic opal (at the end of glacial terminations) and organic carbon (between terminations). These results suggest that chlorins, unlike other proxies, can serve as a measure of total primary productivity variations.

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Author notes

  1. P. G. Harris

    Present address: Biomedical Mass Spectrometry Unit, Wallace Wurth School of Medicine, University of New South Wales, Sydney, 2052, Australia

Authors and Affiliations

  1. Organic Geochemistry Unit, School of Chemistry, University of Bristol, Cantocks Close, Bristol, BS8 ITS, UK

    P. G. Harris, M. Zhao, A. Rosell-Melé & J. R. Maxwell

  2. Geomar Forschungszentrum für Marine Geowissenschaften, Wischoffstrasse 1-3, D-24148, Kiel, Germany

    R. Tiedemann

  3. Geologisch-Paläontologisches Institut, Universität zu Kiel, Olshausenstrasse 40, D-24118, Kiel, Germany

    M. Sarnthein

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  1. P. G. Harris
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  2. M. Zhao
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  4. R. Tiedemann
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  5. M. Sarnthein
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  6. J. R. Maxwell
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Harris, P., Zhao, M., Rosell-Melé, A. et al. Chlorin accumulation rate as a proxy for Quaternary marine primary productivity. Nature 383, 63–65 (1996). https://doi.org/10.1038/383063a0

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