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Direct and indirect effects of anthropogenic aerosols on regional precipitation over east Asia

Publication ,  Journal Article
Huang, Y; Chameides, WL; Dickinson, RE
Published in: Journal of Geophysical Research Atmospheres
February 16, 2007

A regional coupled climate-chemistry-aerosol model is developed. It is used to assess the direct and indirect effects of anthropogenic sulfate and carbonaceous aerosols on regional climate over east Asia with a focus on precipitation. The simulated direct and first indirect effects for the most part reduce the solar radiation and hence decrease the surface temperature, while the second indirect effect generates both negative solar forcing and a substantial positive long-wave forcing. It decreases the precipitation, but because of the cancelling effect, surface temperature does not change very much. With the interactively model-calculated current aerosol loading and the combined direct/ semidirect/first indirect effect, the simulated precipitation is reduced by about 10% in the fall and winter and by about 5% in the spring and summer. The second indirect effect has the largest impact, by itself decreasing the fall and winter precipitation from about 3% to 20%, depending on the autoconversion scheme assumed. The semidirect effect on precipitation is relatively small. An empirical orthogonal function analysis of climatological precipitation over east Asia since the last century shows a decreasing trend of the leading modes over most of China in the fall and winter, which is generally geographically consistent with the distribution of the model-simulated precipitation reduction from anthropogenic aerosols. Copyright 2007 by the American Geophysical Union.

Duke Scholars

Published In

Journal of Geophysical Research Atmospheres

DOI

ISSN

0148-0227

Publication Date

February 16, 2007

Volume

112

Issue

3

Related Subject Headings

  • Meteorology & Atmospheric Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Huang, Y., Chameides, W. L., & Dickinson, R. E. (2007). Direct and indirect effects of anthropogenic aerosols on regional precipitation over east Asia. Journal of Geophysical Research Atmospheres, 112(3). https://doi.org/10.1029/2006JD007114
Huang, Y., W. L. Chameides, and R. E. Dickinson. “Direct and indirect effects of anthropogenic aerosols on regional precipitation over east Asia.” Journal of Geophysical Research Atmospheres 112, no. 3 (February 16, 2007). https://doi.org/10.1029/2006JD007114.
Huang Y, Chameides WL, Dickinson RE. Direct and indirect effects of anthropogenic aerosols on regional precipitation over east Asia. Journal of Geophysical Research Atmospheres. 2007 Feb 16;112(3).
Huang, Y., et al. “Direct and indirect effects of anthropogenic aerosols on regional precipitation over east Asia.” Journal of Geophysical Research Atmospheres, vol. 112, no. 3, Feb. 2007. Scopus, doi:10.1029/2006JD007114.
Huang Y, Chameides WL, Dickinson RE. Direct and indirect effects of anthropogenic aerosols on regional precipitation over east Asia. Journal of Geophysical Research Atmospheres. 2007 Feb 16;112(3).

Published In

Journal of Geophysical Research Atmospheres

DOI

ISSN

0148-0227

Publication Date

February 16, 2007

Volume

112

Issue

3

Related Subject Headings

  • Meteorology & Atmospheric Sciences