Title A simulation of the global distribution and radiative forcing of soil dust aerosols at the last glacial maximum
Author Takemura, T.; Egashira, M.; Matsuzawa, K.; Ichijo, H.; O'ishi, R.; Abe-Ouchi, A.
Author Affil Takemura, T., Kyushu University, Research Institute for Applied Mechanics, Kyushu, Japan. Other: University of Tokyo, Japan
Source Atmospheric Chemistry and Physics, 9(9), p.3061-3073, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680- 7316
Publication Date 2009
Notes In English. Includes appendices; published in Atmospheric Chemistry and Physics Discussion: 9 December 2008, http://www.atmos-chem-phys- discuss.net/8/20463/2008/acpd-8-20463-2008.ht ml; accessed in Apr., 2011. 50 refs. Ant. Acc. No: 91570. GeoRef Acc. No: 310581
Index Terms aerosols; dust; glacial deposits; glacial geology; hydrocarbons; ice sheets; marine deposits; paleoclimatology; sediments; simulation; soils; vegetation; Arctic Ocean; Asia; Sahara; Antarctica--Vostok; Africa; aliphatic hydrocarbons; alkanes; Antarctica; carbon dioxide; clastic sediments; climate forcing; cryosphere; general circulation models; glacial environment; global; greenhouse gases; ice cores; last glacial maximum; marine sediments; methane; organic compounds; solar forcing; spatial distribution; transport; Vostok Antarctica; wind transport; winds
Abstract In this study an integrated simulation of the global distribution and the radiative forcing of soil dust aerosols at the Last Glacial Maximum (LGM) is performed with an aerosol climate model, SPRINTARS. It is compared with another simulation for the present climate condition. The global total emission flux of soil dust aerosols at the LGM is simulated to be about 2.4 times as large as that in the present climate, and the simulated deposition flux is in general agreement with estimations from ice core and marine sediment samplings though it appears to be underestimated over the Antarctic. The calculated direct radiative forcings of soil dust aerosols at the LGM is close to zero at the tropopause and -0.4 W m-2 at the surface. These radiative forcings are about twice as large as those in the present climate. SPRINTARS also includes the microphysical parameterizations of the cloud-aerosol interaction both for liquid water and ice crystals, which affect the radiation budget. The positive radiative forcing from the indirect effect of soil dust aerosols is mainly caused by their properties to act as ice nuclei. This effect is simulated to be smaller (-0.9 W m-2) at the LGM than in the present. It is suggested that atmospheric dust might contribute to the cold climate during the glacial periods both through the direct and indirect effects, relative to the interglacial periods.
URL http://www.atmos-chem-phys.net/9/3061/2009/acp-9-3061-2009.pdf
Publication Type journal article
Record ID 65007020