Effects of Air Pollutants on Summer Precipitation in Different Regions of Beijing
Effects of Air Pollutants on Summer Precipitation in Different Regions of Beijing
复制标题
空气污染物对北京不同地区夏季降水的影响
DOI：
10.3390/atmos13010141
复制
发表时间：
2022-01
期刊：
影响因子：
2.9
通讯作者：
Yongqing Wang
中科院分区：
文献类型：
--
作者：
Yan Yang;Wei Zhou;Qian Gao;Delong Zhao;Xiange Liu;Yongqing Wang
许多研究表明，大气污染物对城市降水有着复杂的影响。利用气象站和卫星气溶胶光学厚度（AOD）产品资料，结合WRF-Chem模式的模拟结果，分析了北京市不同地区大气污染物对夏季降水的影响。结果表明，北京地区夏季空气污染强度对平原和山区降水贡献率均有影响，其中平原地区影响最大。在过去的20年里，当AOD增加0.15时，平原PCR增加约10%，而随着污染水平的降低，PCR下降。相反，山区的PCR随着污染水平的升高而降低，随着污染水平的降低而升高。模式结果分析显示，气溶胶的增加会降低云滴和雨滴的有效粒径。较小的云滴更容易输送到高空，参与云中冰相物质的生成，增加了一定时间内空气中云水总量，最终增强了平原地区的降水强度。平原地区降水量增加造成的污染物清除减少了山区的降雨量。
Many studies have shown that air pollutants have complex impacts on urban precipitation. Meteorological weather station and satellite Aerosol Optical Depth (AOD) product data from the last 20 years, combined with simulation results from the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem), this paper focuses on the effects of air pollutants on summer precipitation in different regions of Beijing. These results showed that air pollution intensity during the summer affected the precipitation contribution rate (PCR) of plains and mountainous regions in the Beijing area, especially in the plains. Over the past 20 years, plains PCR increased by ~10% when the AOD augmented by 0.15, whereas it decreased with lower pollution levels. In contrast, PCR in mountainous areas decreased with higher pollution levels and increased with lower pollution levels. Our analysis from model results indicated that aerosol increases reduce the effective particle size of cloud droplets and raindrops. Smaller cloud raindrops more readily transport to high air layers and participate in the generation of ice-phase substances in the clouds, increasing the total amount of cloud water in the air in a certain time, which ultimately enhanced precipitation intensity on the plains. The removal of pollutants caused by increased precipitation in the plains decreased rainfall levels in mountainous areas.
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影响因子：
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作者：
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