Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29a..11m&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 1, pp. 11-1, CiteID 1011, DOI 10.1029/2001GL013240
Physics
6
Oceanography: General: Paleoceanography, Meteorology And Atmospheric Dynamics: Paleoclimatology, Oceanography: General: Arctic And Antarctic Oceanography, Oceanography: General: Numerical Modeling
Scientific paper
Recently, Stephens and Keeling [2000] have put forward an appealing theory for explaining the decrease in glacial atmospheric CO2. They argue that a compact sea-ice cover extending southward of ~55° S trapped large amounts of CO2 beneath the sea surface, thus accounting for the lower atmospheric concentrations. An atmosphere-ocean box model in which sea-ice area is prescribed allows them to simulate ~80% of the CO2 drawdown. However, glacial CO2 levels can be attained in their model only when the fraction of ice-covered area southward of the Antarctic Polar Front rises to 99-100%. We present simulations with a coupled sea ice-upper ocean model indicating that ice-area fractions so large might have not prevailed even under rather extreme glacial conditions. The combination of our glacial ice-coverage estimates with the ice area-CO2 relation derived by Stephens and Keeling suggests that CO2 sequestration under sea ice could account for at most 15-50% of the total glacial CO2 decline.
Morales Maqueda M. A.
Rahmstorf Stefan
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