Loss of Carbon from the Deep Sea Since the Last Glacial Maximum
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Fig. S1b. LGM carbonate ion concentration
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Loss of Carbon from the Deep Sea Since the Last Glacial Maximum
Science
Vol. 330, pp. 1084-1087, 19 November 2010.
DOI: 10.1126/science.1193221
Jimin Yu1, Wally S. Broecker1, Harry Elderfield2, Zhangdong Jin3,
Jerry McManus1, Fei Zhang3
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1 Lamont-Doherty Earth Observatory of Columbia University,
61 Route 9W/Post Office Box 1000, Palisades, NY 10964-8000, USA.
2 The Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences,
University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK.
3 State Key Laboratory of Loess and Quaternary Geology,
Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710075, China
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ABSTRACT:
Deep-ocean carbonate ion concentrations ([CO3 2-]) and carbon
isotopic ratios (δ13C) place important constraints on past
redistributions of carbon in the ocean-land-atmosphere system
and hence provide clues to the causes of atmospheric CO2
concentration changes. However, existing deep-sea [CO3 2-]
reconstructions conflict with one another, complicating
paleoceanographic interpretations. Here, we present deep-sea
[CO3 2-] for five cores from the three major oceans quantified
using benthic foraminiferal boron/calcium ratios since the last
glacial period. Combined benthic δ13C and [CO3 2-] results
indicate that deep-sea-released CO2 during the early deglacial
period (17.5 to 14.5 thousand years ago) was preferentially
stored in the atmosphere, whereas during the late deglacial
period (14 to 10 thousand years ago), besides contributing to
the contemporary atmospheric CO2 rise, a substantial portion
of CO2 released from oceans was absorbed by the terrestrial
biosphere.
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