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| Titel |
A simulation of the global distribution and radiative forcing of soil dust aerosols at the Last Glacial Maximum |
| VerfasserIn |
T. Takemura, M. Egashira, K. Matsuzawa, H. Ichijo, R. O'ishi, A. Abe-Ouchi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 9 ; Nr. 9, no. 9 (2009-05-13), S.3061-3073 |
| Datensatznummer |
250007273
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| Publikation (Nr.) |
 copernicus.org/acp-9-3061-2009.pdf |
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| Zusammenfassung |
| 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. |
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