Compound effects of Antarctic sea ice on atmospheric pCO2 change during glacial-interglacial cycle

Details Compound effects of Antarctic sea ice on atmospheric pCO2 change during glacial-interglacial cycle Compound effects of Antarctic sea ice on atmospheric pCO2 change during glacial-interglacial cycle

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3420708k&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 20, CiteID L20708

Mathematics

Logic

5

Biogeosciences: Paleoclimatology And Paleoceanography (3344, 4900), Oceanography: Biological And Chemical: Carbon Cycling (0428), Paleoceanography: Global Climate Models (1626, 3337), Paleoceanography: Greenhouse Gases, Global Change: Climate Dynamics (0429, 3309)

Scientific paper

The cause of low atmospheric CO2 concentrations during the Last Glacial Maximum (LGM) is important for understanding the role of the carbon cycle in climatic variation. We used an ocean general circulation model, coupled with a biogeochemical model, to examine the effect of sea-ice expansion in the Southern Ocean on atmospheric CO2 concentration. We newly considered a possible additional effect of sea-ice expansion in reducing biological activity as well as the effect of reduced gas-exchange. We propose that the new effect might have had an opposite operation and canceled the gas-exchange effect. Although there are some uncertainties arising from the absence of explicit sea-ice model in this study, these results suggest that sea-ice expansion might be far from the principal mechanism for low CO2 concentration during the LGM.

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