Effects of physical changes in the ocean on the atmospheric pCO2: glacial-interglacial cycles |
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| Authors: | Takasumi Kurahashi-Nakamura Ayako Abe-Ouchi Yasuhiro Yamanaka |
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| Institution: | (1) Frontier Research Center for Global Change, JAMSTEC, Yokohama, Japan;(2) Present address: Center for Climate System Research, The University of Tokyo, Kashiwa, Japan;(3) School of Geographical Sciences, University of Bristol, Bristol, UK;(4) Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Japan |
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| Abstract: | Based on LGM experiments with an atmosphere–ocean general circulation model, we systematically investigated the effects of
physical changes in the ocean and induced biological effects as well on the low atmospheric CO2 concentration (pCO2) at the last glacial maximum (LGM). Numerical experiments with an oceanic carbon-cycle model showed that pCO2 was lowered by ~30 ppm in the LGM ocean. Most of the pCO2 reduction was explained by the change in CO2 solubility in the ocean due to lower sea surface temperature (SST) during the LGM. Moreover, we found that SST changes in
the high-latitude Northern Atlantic could explain more than one-third of the overall change in pCO2 induced by global SST change, suggesting an important feedback between the Laurentide ice sheet and pCO2. |
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