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HERO ID
2591681
Reference Type
Journal Article
Title
Wind-Driven Upwelling in the Southern Ocean and the Deglacial Rise in Atmospheric CO2
Author(s)
Anderson, RF; Ali, S; Bradtmiller, LI; Nielsen, SHH; Fleisher, MQ; Anderson, BE; Burckle, LH
Year
2009
Is Peer Reviewed?
1
Journal
Science
ISSN:
0036-8075
EISSN:
1095-9203
Volume
323
Issue
5920
Page Numbers
1443-1448
PMID
19286547
DOI
10.1126/science.1167441
Web of Science Id
WOS:000264101700031
Abstract
Wind-driven upwelling in the ocean around Antarctica helps regulate the exchange of carbon dioxide (CO2) between the deep sea and the atmosphere, as well as the supply of dissolved silicon to the euphotic zone of the Southern Ocean. Diatom productivity south of the Antarctic Polar Front and the subsequent burial of biogenic opal in underlying sediments are limited by this silicon supply. We show that opal burial rates, and thus upwelling, were enhanced during the termination of the last ice age in each sector of the Southern Ocean. In the record with the greatest temporal resolution, we find evidence for two intervals of enhanced upwelling concurrent with the two intervals of rising atmospheric CO2 during deglaciation. These results directly link increased ventilation of deep water to the deglacial rise in atmospheric CO2.
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