Aerosol impacts on radiative and microphysical properties of clouds and precipitation formation

被引:53
|
作者
Alizadeh-Choobari, O. [1 ]
Gharaylou, M. [1 ]
机构
[1] Univ Tehran, Inst Geophys, POB 14155-6466, Tehran, Iran
基金
美国国家科学基金会;
关键词
Aerosol-cloud interactions; Shortwave cloud forcing; Liquid water content; Cloud base height; SUPERCOOLED LIQUID WATER; DEEP CONVECTIVE CLOUDS; POLLUTION AEROSOL; MODEL DESCRIPTION; SATELLITE DATA; GOCART MODEL; PHASE CLOUDS; PARAMETERIZATION; ALBEDO; SENSITIVITY;
D O I
10.1016/j.atmosres.2016.10.021
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Through modifying the number concentration and size of cloud droplets, aerosols have intricate impacts on radiative and microphysical properties of clouds, which together influence precipitation processes. Aerosol-cloud interactions for a mid-latitude convective cloud system are investigated using a two-moment aerosol-aware bulk microphysical scheme implemented into the Weather Research and Forecasting (WRF) model. Three sensitivity experiments with initial identical dynamic and thermodynamic conditions, but different cloud-nucleating aerosol concentrations were conducted. Increased aerosol number concentration has resulted in more numerous cloud droplets of overall smaller sizes, through which the optical properties of clouds have been changed. While the shortwave cloud forcing is significantly increased in more polluted experiments, changes in the aerosol number concentration have negligible impacts on the longwave cloud forcing. For the first time, it is found that polluted clouds have higher cloud base heights, the feature that is caused by more surface cooling due to a higher shortwave cloud forcing, as well as a drier boundary layer in the polluted experiment compared to the clean. The polluted experiment was also associated with a higher liquid water content (LWC), caused by an increase in the number of condensation of water vapor due to higher concentration of hygroscopic aerosols acting as condensation nuclei. The domain-averaged accumulated precipitation is little changed under both polluted and clean atmosphere. Nevertheless, changes in the rate of precipitation are identified, such that under polluted atmosphere light rain is reduced, while both moderate and heavy rain are intensified, confirming the fact that if an ample influx of water vapor exists, an increment of hygroscopic aerosols can increase the amount of precipitation. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:53 / 64
页数:12
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