Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-8-20463-2008
http://www.atmos-chem-phys-discuss.net/8/20463/2008/
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http://www.atmos-chem-phys-discuss.net/8/20463/2008/acpd-8-20463-2008.pdf
20463
20500
2008-12-09
Global distribution and radiative forcing of soil dust aerosols in the Last Glacial Maximum simulated by the aerosol climate model
T. Takemura
toshi@riam.kyushu-u.ac.jp
M. Egashira
K. Matsuzawa
H. Ichijo
R. O'ishi
A. Abe-Ouchi
Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan
Interdisciplinary Graduate School of Engineering Sciences, Kyushu Univ., Fukuoka, Japan
Center for Climate System Research, University of Tokyo, Chiba, Japan
The integrated simulation for the global distribution and
radiative forcing of soil dust aerosols in the Last Glacial
Maximum (LGM) is done by an aerosol climate model, SPRINTARS,
in this study. It is compared with another simulation in the
present climate condition. The global total emission flux of
soil dust aerosols in 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 might be underestimated over the Antarctic. The calculated
direct radiative forcing of soil dust aerosols in the LGM is
close to zero at the tropopause and −0.4 W m<sup>−2</sup>
at the surface, which 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 of the indirect effect
due to soil dust aerosols, that is mainly caused by a role of
ice nuclei, is simulated to be smaller in 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.
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