This is a Preprint and has not been peer reviewed. This is version 4 of this Preprint.
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Abstract
Determining the feedbacks that modulate Southern Ocean carbon dynamics is key to understanding past and future climate. The global pause in rising atmospheric CO2 during the period of mid- to high-latitude southern surface cooling known as the Antarctic Cold Reversal (ACR, 14,700-12,700 years ago) provides an opportunity to disentangle competing influences. We present highly-resolved and precisely-aligned ice and marine reconstructions that capture a previously unrecognized increase in microbial diversity and ocean primary productivity during the ACR. Transient climate modeling across the last glacial suggests this period corresponds to a maximum seasonal difference in sea-ice extent. Our results indicate that this increased seasonal sea-ice variability drove changes in high-latitude light, temperature and nutrient availability, turning the southern seasonal sea-ice zone into a globally significant carbon sink.
DOI
https://doi.org/10.31223/osf.io/64mve
Subjects
Biogeochemistry, Earth Sciences, Glaciology, Paleontology, Physical Sciences and Mathematics
Keywords
Antarctica, Antarctic Cold Reversal, Blue Ice Areas, ice core biomarkers, Last Glacial Transition, sea ice-carbon feedbacks, Southern Hemisphere Westerlies
Dates
Published: 2019-05-31 10:56
Last Updated: 2019-09-04 10:02
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