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1 Q = O OMMU P ADVANCES IN CLIMATE CHANGE RESEARCH Vol.4, No.2 March, 2 8!" (28) 2--6 &'()*+,-./ I & NIO == N N=&' =NMMMUN O= &'()*+, =RNMSRR = NCAR! GCM CAM3. &'()*+,-&'()*+, &'()*+,-./!"&'()*+,-./2345 J.25 W/m 2!" 25 N!"#$&'(&' &'(&'()*+,&'()$*+,-./2!GCM CAM3.!"#$!"#$!"!"#P425/X53===!"#A = ====&'()*+,-./ &'()*!"! &'()*!"#$ =IPCC! & '()*+,- J.4.2 W/m 2 ====Luo 2! 3 & CRCM.75 µm AOD &'()*+,&'(+-.!"&'()*+, &!'(& &'! 4 AOD & 2 6 8!"!"#!"#Gu 5!"!"!"#!"#!"# &'( &'("#$)*+,-. &'()*+,-.!/ ==== &'()*+, &'()*&+,-./ 6 Lau 7J8 &'()*+, &'(&' &'()*+,-.! &'()* &'()*+,!" 6 7&'()*+!"#$ &'()*+,-./2 &'() &' ()*+,-. &'()*+,-./! &'()*+,-*./! 27J4J9 =!"27J9J26 &'() CB4377! 978J &'()*+ K= sjrwto@63.com Adv. Clim. Change Res., 28, 4 (2): J6

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5 O!"&'()*+,-./ (I) & 5 55 N 5 N 45 N 4 N 35 N 3 N 25 N 2 N (a) J.5.5 J.5.5 J2 J3 J.5 J.5 J.7 J J2 5 N J.5 7 E 8 E 9 E E E 2 E 3 E 4 E 55 N 5 N 45 N 4 N 35 N 3 N 25 N 2 N. (b) J. J.4 J. J.2. J.2. J. 5 N 7 E 8 E 9 E E E 2 E 3 E 4 E 5 6 8!" (mm) (a)!"=(b)!"#$ Fig. 5 Changes in surface daily precipitation (mm) for summer (JJA) (a) convective precipitation, (b) large scale precipitation J.7 &'()*+, ==== &'()*+, 2 hpa &'!"# E &"'!"&'()*+,!"#$28 N!" 2 hpa! & 5 25 N!"# &' &%'()*!"#$5 25 N &' 5a 2 35 N! 85 hpa &'()*+ &' 5 N &'()*+,-./ 2 hpa &'()*+,- 25 N&'()* &'()*&+!"#$. J.5 J3. J. J. J J.7. J /hpa J.6 J N J.4J.2.4 J N 3 N 4 N 5 N 6 N 2 m/s 6 6 N! 5 2 E!" #$%&'()=(m/s) ( ) Fig. 6 Differences of the average vertical meridional circulation (m/s) and temperature ( ) over 5 ~2 E for ~6 N between control experiment and sensitive experiment J J.4 J.6 ====&'()*+,-./! 4 &'!"# &'(&'(!"#&'(#)(#!&'()*+#$%,!"#$ [4] #&'!"!"#&'( &!"'()* 7.76% 5.97% Q==! ====!"&'()*+, &'()*!"#!"#&' &'()*+,! &'()*& &'()*! "#!$ &'&' &'(&'( &!"#$ ====&'()*+,-(./ &'()*"+,-"#$%.!&'()*+, Adv. Clim. Change Res., 28, 4 (2): J6 5

6 = = = 6 =OMMU! [] Forster P, Ramaswamy V, Artaxo P, et al. Changes in atmospheric constituents and in radiative forcing [M]//IPCC. Climate Change 27: induced by aerosol direct forcing: the role of the Tibetan Plateau [J]. Climate. Dyn., 26, 26: 855J864 The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, United Kingdom and New York, USA: Cambridge University Press, 27 [8] [9] Lau K M, Kim K M. Observational relationships between aerosol and Asian monsoon rainfall, and circulation [J]. Geophys. Res. Lett., 26, 33: L28, doi:.29/26gl27546 I= I= I= K!=[M].= W=!", [2] [3] Luo Yunfeng, Zhou Xiuji, Li Weiliang. A numerical study of the atmospheric aerosol climate forcing in China [J]. Chinese Journal of Atmospheric Science, 999, 23 (): J2 I= K=&'()$*+,-.&/ 99 [] Collins W D, Rasch P J, Eaton B E, et al. Simulating aerosols using a chemical transport model with assimilation of satellite aerosol retrievals: Methodology for INDOEX [J]. J. Geophys. Res., 2, 6: 733J7336 [C]//!"#$%&'()*+,-.=E FK= W= [] Collins W D, Rasch P J, Eaton B E, et al. Simulation of aerosol [4] [5] [6] [7]! I=996: 273J288 I= I= I K= 8 &'!=[J].! I=24, 62 (5): 634J645 Gu Y, Liou K N, Xue Y, et al. Climatic effects of different aerosol types in China simulated by the University of California, Los Angeles atmospheric general circulation model [J]. J. Geophy. Res., 26,, D52, doi:.29/25jd632 Singh R P, Tare V, Tripathi S N. Aerosols, clouds and monsoon [J]. Current Science, 25, 88 (9): 366J368 Lau K M, Kim M K, Kim K M. Asian summer monsoon anomalies distributions and radiative forcing for INDOEX: regional climate impacts [J]. J. Geophys. Res., 22,7, doi:.29/2 JD365 [2] I= I= I= K= &'()*+ &'()*+=[J].=!"#,=25, 6 (3): 322J333 [3] Jacobson M Z, Kaufman Y J. Wind reduction by aerosol particles=[j]. Geophys. Res. Lett., 26, 33: L2484, doi:.29/26gl27838 [4] I= I= K=&'()*+,- =[J].=!, =22, 26 (): 69J82 Possible Effect of Aerosols over China on East Asian Summer Monsoon ( I ): Sulfate aerosols Sun Jiaren, 2, Liu Yu ( Chinese Academy of Metorological Sciences, Beijing 8, China; 2 South China Institute of Environmental Sciences, State Environmental Protection Administration of China, Guangzhou 5655, China) Abstract: The effects of sulfate aerosols over China on East Asian summer monsoon and precipitation were investigated using the latest version of general circulation model (GCM) CAM3. developed by NCAR/UCAR, coupled with an off-line aerosol assimilation system. The model results show that sulfate aerosols over China could bring about an extra global radiative force of J.25 W/m 2. In most of China ( about the north of 25 N), the surface temperature universally drops while sea surface temperature increases, which drops the temperature difference between sea and land so that it weakens the East Asian summer monsoon and the precipitation in China. Especially, the cumulus cloud precipitation decreases greatly since sulfate aerosols mainly suppress the convection and cumulus cloud precipitation over China. Key words: GCM CAM3.; sulfate aerosols; direct climate effect; East Asian summer monsoon 6 Adv. Clim. Change Res., 28, 4 (2): J6

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