A numerical study of the effect of different aerosol types on East Asian summer clouds and precipitation
A numerical study of the effect of different aerosol types on East Asian summer clouds and precipitation
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DOI：
10.1016/j.atmosenv.2012.12.039
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发表时间：
2013-05-01
影响因子：
5
通讯作者：
Wang, Minghuai
中科院分区：
文献类型：
--
作者：
Jiang, Yiquan;Liu, Xiaohong;Wang, Minghuai
本文利用NCAR社区大气模式第5版(CAM5)研究了人为气溶胶对东亚夏季风云和降水的影响。CAM5是一个最新的气候模式，它考虑了气溶胶的直接、半直接和间接影响。从不同的敏感性模拟中分解了所有人为气溶胶以及人为黑碳(BC)、硫酸盐和初级有机物(POM)的影响。人为硫酸盐和POM通过散射太阳辐射直接减少到达地面的太阳通量，通过增加东中国上空的云滴数密度和云液态水路径间接地减少到达地面的太阳通量。陆面气温降低，中国北部降水受到抑制。与人为硫酸盐和POM不同，人为BC由于其半直接作用减少了云的液态水路径，减弱了短波云的强迫作用，因此对地面气温的影响不大。人为的BC加强了中国南部的西南风，导致了北纬25°-30°带的较强的深部对流。所有人为气溶胶对气温、云和降水的影响不是单个人为硫酸盐、BC和POM影响的线性总和。总体而言，所有人为气溶胶都抑制了中国北部的降水，增强了中国南部及邻近海域的降水。(C)2013爱思唯尔有限公司。保留所有权利。
In this study, the anthropogenic aerosol impact on the summer monsoon clouds and precipitation in East Asia is investigated using the NCAR Community Atmospheric Model version 5 (CAM5), a state-of-the-art climate model considering aerosol direct, semi-direct and indirect effects. The effects of all anthropogenic aerosols, and anthropogenic black carbon (BC), sulfate, and primary organic matter (POM) are decomposed from different sensitivity simulations. Anthropogenic sulfate and POM reduce the solar flux reaching the surface directly by scattering the solar radiation, and indirectly by increasing the cloud droplet number concentration and cloud liquid water path over East China. The surface air temperature over land is reduced, and the precipitation in North China is suppressed. Unlike anthropogenic sulfate and POM, anthropogenic BC does not have a significant effect on the air temperature at the surface, because of the reduction of the cloud liquid water path and the weakening of shortwave cloud forcing by its semi-direct effect. The anthropogenic BC strengthens the southwesterly wind over South China and leads to stronger deep convection at the 25 degrees N-30 degrees N latitudinal band. The effect of all anthropogenic aerosols on air temperature, clouds, and precipitation is not a linear summation of effects from individual anthropogenic sulfate, BC and POM. Overall all anthropogenic aerosols suppress the precipitation in North China and enhance the precipitation in South China and adjacent ocean regions. (C) 2013 Elsevier Ltd. All rights reserved.