气候变化领域集成服务门户(CCPortal): An observational study of the effects of aerosols on diurnal variation of heavy rainfall and associated clouds over Beijing-Tianjin-Hebei

CCPortal

DOI	10.5194/acp-20-5211-2020
	An observational study of the effects of aerosols on diurnal variation of heavy rainfall and associated clouds over Beijing-Tianjin-Hebei
	Zhou S.; Yang J.; Wang W.-C.; Zhao C.; Gong D.; Shi P.
发表日期	2020
ISSN	16807316
起始页码	5211
结束页码	5229
卷号	20 期号:9
英文摘要	Our previous study found that the observed rainfall diurnal variation over Beijing-Tianjin-Hebei shows the distinct signature of the effects of pollutants. Here we used the hourly rainfall data together with satellite-based daily information of aerosols and clouds to further investigate changes in heavy rainfall and clouds associated with aerosol changes. Because of the strong coupling effects, we also examined the sensitivity of these changes to moisture (specific humidity) variations. For heavy rainfall, three distinguished characteristics are identified: earlier start time, earlier peak time, and longer duration; and the signals are robust using aerosol indicators based on both aerosol optical depth and cloud droplet number concentration. In-depth analysis reveals that the first two characteristics occur in the presence of (absorbing) black carbon aerosols and that the third is related to more (scattering) sulfate aerosols and is sensitive to moisture abundance. Cloud changes are also evident, showing increases in cloud fraction, cloud top pressure, the liquid/ice cloud optical thickness and cloud water path and a decrease in ice cloud effective radius; and these changes are insensitive to moisture. Finally, the mechanisms for heavy rainfall characteristics are discussed and hypothesized. © 2020 Copernicus GmbH. All rights reserved.
关键词	aerosol black carbon cloud cover cloud droplet diurnal variation optical depth rainfall satellite data Beijing [China]China Hebei Tianjin
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132062
推荐引用方式 GB/T 7714	Zhou S.,Yang J.,Wang W.-C.,et al. An observational study of the effects of aerosols on diurnal variation of heavy rainfall and associated clouds over Beijing-Tianjin-Hebei[J]. Atmospheric Chemistry and Physics,2020,20(9).
APA	Zhou S.,Yang J.,Wang W.-C.,Zhao C.,Gong D.,&Shi P..(2020).An observational study of the effects of aerosols on diurnal variation of heavy rainfall and associated clouds over Beijing-Tianjin-Hebei.,20(9).
MLA	Zhou S.,et al."An observational study of the effects of aerosols on diurnal variation of heavy rainfall and associated clouds over Beijing-Tianjin-Hebei".20.9(2020).