Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.atmosres.2016.10.021 |
Aerosol impacts on radiative and microphysical properties of clouds and precipitation formation | |
Alizadeh-Choobari, O.; Gharaylou, M. | |
2017-03-01 | |
发表期刊 | ATMOSPHERIC RESEARCH |
ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2017 |
卷号 | 185 |
文章类型 | Article |
语种 | 英语 |
国家 | Iran |
英文摘要 | 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. |
英文关键词 | Aerosol-cloud interactions Shortwave cloud forcing Liquid water content Cloud base height |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000390737800006 |
WOS关键词 | SUPERCOOLED LIQUID WATER ; DEEP CONVECTIVE CLOUDS ; POLLUTION AEROSOL ; MODEL DESCRIPTION ; SATELLITE DATA ; GOCART MODEL ; PHASE CLOUDS ; PARAMETERIZATION ; ALBEDO ; SENSITIVITY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/38326 |
专题 | 地球科学 |
作者单位 | Univ Tehran, Inst Geophys, POB 14155-6466, Tehran, Iran |
推荐引用方式 GB/T 7714 | Alizadeh-Choobari, O.,Gharaylou, M.. Aerosol impacts on radiative and microphysical properties of clouds and precipitation formation[J]. ATMOSPHERIC RESEARCH,2017,185. |
APA | Alizadeh-Choobari, O.,&Gharaylou, M..(2017).Aerosol impacts on radiative and microphysical properties of clouds and precipitation formation.ATMOSPHERIC RESEARCH,185. |
MLA | Alizadeh-Choobari, O.,et al."Aerosol impacts on radiative and microphysical properties of clouds and precipitation formation".ATMOSPHERIC RESEARCH 185(2017). |
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