A regional climate model RegCM4 coupled with an on-line dust module is used to simulate the impacts of dust direct effects on the precipitation over East Asia in 20 years(from March 1990 to February 2010).Two sets of experiments are conducted,one with and one without the dust effects.The simulated results show that the precipitation is reduced over most parts of East Asian continent and the average decreased magnitude is 4.46%.The reduction is especially significant over the areas to east of 100°E.The maximum reduction appears both in spring and winter,the secondary maximum reduction in fall,and the minimum in summer.The most contribution to the total precipitation reduction is convective precipitation is summer and fall,which is contrast with the non-convective precipitation in winter.In spring,the convective precipitation change is almost same to the non-convective precipitation.Compared to the increased trace rain days by the dust effects over East Asian continent,the small,medium and large rain days are increased,while the slight and heavy rain days change little.At last,both the descending motion and the reduced water vapor in middle and lower troposphere lead to the decreased precipitation over most parts of East Asian continent.
SU Xingtao
,
XU Liren
,
WEI Qiang
,
ZHANG Zhibiao
,
WANG Shengguo
,
WU Hongxing
. Study of Impacts of Dust Aerosol on Precipitation over East Asia[J]. Plateau Meteorology, 2016
, 35(1)
: 211
-219
.
DOI: 10.7522/j.issn.1000-0534.2014.00091
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