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| Titel |
Simulation of dust aerosol and its regional feedbacks over East Asia using a regional climate model |
| VerfasserIn |
D. F. Zhang, A. S. Zakey, X. J. Gao, F. Giorgi, F. Solmon |
| 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. 4 ; Nr. 9, no. 4 (2009-02-16), S.1095-1110 |
| Datensatznummer |
250006913
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| Publikation (Nr.) |
 copernicus.org/acp-9-1095-2009.pdf |
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| Zusammenfassung |
| The ICTP regional climate model (RegCM3) coupled with a desert dust aerosol
model is used to simulate the net radiative forcing (short-wave and
long-wave) and related climate effects of dust aerosols over East Asia. Two
sets of experiments are completed and intercompared, one without (Exp. 1) and
one with (Exp. 2) the radiative effects of dust aerosols. The experiments
encompass the main dust producing months, February through May, for 10 years
(1997–2006), and the simulation results are evaluated against ground
station and satellite data. The model captures the basic observed
climatology over the area of interest. The spatial and temporal variations
of near surface concentration, mass load, optical depth and emission of dust
aerosols from the main source regions are reproduced by model. The main
model deficiency is an overestimate of dust amounts over the source regions
and an underestimate downwind of these source areas, which indicates an
underestimate of dust dispersal. Over the desert source regions, the net TOA
radiative forcing is positive, while it is small over the other regions as a
result of high surface albedo values which reduce the short-wave radiative
forcing. The net surface radiative fluxes are decreased by dust and this
causes a surface cooling locally up to −1°C. The inclusion of net
(short-wave and long-wave) dust radiative forcing leads to a reduction of
dust emission in the East Asia source regions, which is mainly caused by an
increase in local stability and a corresponding decrease in dust lifting.
Our results indicate that dust effects should be included in the assessment
of climate change over East Asia. |
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