Coupled climate and subarctic Pacific nutrient upwelling over the last 850,000 years

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1016/j.epsl.2019.06.028. This is version 2 of this Preprint.

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Authors

Savannah Worne , Sev Kender, George Swann , Melanie Leng, Ana Christina Ravelo

Abstract

High latitude deep water upwelling has the potential to control global climate over glacial timescales through the biological pump and ocean-atmosphere CO2 exchange. However, there is currently a lack of continuous long nutrient upwelling records with which to assess this mechanism. Here we present geochemical proxy records for nutrient upwelling and glacial North Pacific Intermediate Water (GNPIW) formation in the Bering Sea over the past 850 kyr, which demonstrates that glacial periods were characterised by reduced nutrient upwelling, when global atmospheric CO2 and temperature were also lowered. We suggest that glacial expansion of sea ice in the Bering Sea, and the simultaneous expansion of low nutrient GNPIW, inhibited vertical mixing and nutrient supply across the subarctic Pacific Ocean. Our findings lend support to the suggestion that high latitude sea ice and the resultant intermediate water formation, modulated deep water upwelling and ocean-atmosphere CO2 exchange on glacial-interglacial timescales.

DOI

https://doi.org/10.31223/osf.io/edya7

Subjects

Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Keywords

CO2, North Pacific, Bering Sea, Expedition 323, glacial, IODP, sea ice, subarctic, U1343, upwelling, upwelling index

Dates

Published: 2019-09-06 14:05

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License

GNU Lesser General Public License (LGPL) 2.1

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