硫酸盐气溶胶间接效应对中国东部冬季气候的影响

doi:10.3969/j.issn.1673-503X.2020.05.007

Abstract

Abstract:

The indirect effects (IE) of aerosols affect the climate through clouds, which is complex and uncertain.Based on the CAM5.1 (Community Atmosphere Model, V5.1) model developed by the NCAR (National Center for Atmospheric Research), sensitivity experiments of the IE of sulfate aerosols were designed to investigate the influence of the IE on a cloud, precipitation and the intensity of monsoon in winter in East China in this paper by changing the number concentrations of the sulfate aerosols that can serve as the cloud condensation nuclei number concentration.The results show that sulfate aerosols play a dominant role in the formation of cloud condensation nuclei (CCN) in East Asia.The indirect effects of sulfate aerosols result in a significant increasing concentration of CCN and cloud droplet number in winter in East China, decrease the effective radius of cloud droplet in the low layer of ocean and land, and increase the total cloud liquid water path, resulting in an increasing albedo of a cloud.The negative radiation effect forces to cool the surface and lower atmosphere, increases the sea level press.The increasing sea-land pressure gradient leads to the intensification of the East Asian winter monsoon and the reduction of the total precipitation rate in southern China.The indirect effects of sulfate aerosols may not be responsible for the decadal weakening of East Asian winter monsoon in the mid-1980s.

Key words: Sulfate aerosol, CAM5.1 model, Sensitivity experiments, East Asian winter monsoon

CLC Number:

P461⁺.8

Dong-dong WANG, Bin ZHU, Xu-jiang WAN. Impact of indirect effects of sulfate aerosol on winter climate in East China[J]. Journal of Meteorology and Environment, 2020, 36(5): 52-61.

Figures/Tables 9

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试验名称	试验设计描述
控制试验：CTRL	包含所有气溶胶的直接和间接效应，其他气候辐射强迫因子如温室气体等保持在2000年气候态状态
减半试验：HALFIE	转化为凝结核计算的硫酸盐气溶胶数浓度减半(×0.5)，其他条件与控制试验相同
加倍试验：DOUBLEIE	转化为凝结核计算的硫酸盐气溶胶数浓度加倍(×2.0)，其他条件与控制试验相同
关闭试验：NONEIE	转化为凝结核计算的硫酸盐气溶胶数浓度关闭(×0)，其他条件与控制试验相同

云特征	850 hPa高度CCN_0.1%/cm^-3	垂直积分CDNC/1×10⁵个·cm^-2	CLWP/g·cm^-2	CER/μm	总云量/(%)	低云量/(%)	中云量/(%)	高云量/(%)
减半试验	40.23	0.31	12.63	-0.04	0.15	0.69	0.33	-0.72
加倍试验	45.01	0.30	7.91	-0.05	-0.48	-0.26	0.24	-0.71
关闭试验	127.36	0.74	41.29	-0.15	1.75	2.43	1.04	0.42

辐射强迫	云短波辐射强迫	云长波辐射强迫	大气顶净短波辐射强迫	地表净短波辐射强迫	地表净长波辐射强迫	地表感热通量	地表潜热通量
减半试验	-2.43	0.32	-3.68	-3.77	-1.24	-0.92	-1.25
加倍试验	-1.54	0.49	-1.04	-0.79	0.25	-0.02	-0.32
关闭试验	-9.13	1.11	-11.97	-12.52	-3.53	-2.93	-3.82

[1]	FANG Yi-he1 ZHANG Yun-fu, SHAO Peng-cheng,ZHOU Fang, ZHAO Lian-wei, JIANG Peng, YU Yang. Variation characteristics of winter air temperature in Liaoning province and its relations with East Asia winter monsoon [J]. Journal of Meteorology and Environment, 2014, 30(1): 57-63.
[2]	XU Meng-liu,YIN Yan. Numerical simulations on directly and indirectly climatic effects of aerosol based on regional climate model version 3 (RegCM3) [J]. Journal of Meteorology and Environment, 2012, 28(1): 1-10.

Impact of indirect effects of sulfate aerosol on winter climate in East China

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