气候变化领域集成服务门户(CCPortal): Influence of aerosols on clouds, precipitation and freezing level height over the foothills of the Himalayas during the Indian summer monsoon

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DOI	10.1007/s00382-021-05710-2
	Influence of aerosols on clouds, precipitation and freezing level height over the foothills of the Himalayas during the Indian summer monsoon
	Adhikari P.; Mejia J.F.
发表日期	2021
ISSN	0930-7575
起始页码	2401
结束页码	2414
英文摘要	Long term (2002–2017) satellite-retrieved and reanalysis datasets are utilized to assess the daily and interannual timescale impact of aerosol loadings on the cloud properties, precipitation amounts, and freezing level height over the southern slopes and adjacent foothills (SSFH) of the Himalayas during the Indian summer monsoon season. Daily timescale composites during polluted days suggest the development of widespread deeper clouds and higher precipitation amounts. Significant efforts were carried out to isolate the role of weather forcing in the daily timescale from the outlined aerosol-cloud-precipitation relationship by using the environmental relative humidity (RH) and vertical velocity (ω). Results provide strong evidence suggesting that regardless of weather pattern forcing, the direct association of aerosol optical depth (AOD) with precipitation, and cloud properties remained consistent for day-to-day timescales. The spatial correlation analyses of daily AOD with cloud properties and precipitation during both wet and dry monsoonal years indicate a positive association of higher aerosol concentration with cloud vertical development and precipitation. The 0 °C isotherm altitude is found to be higher by 136.82 ± 18.82 m (mean ± standard deviation) during the polluted days in comparison to relatively cleaner environments, which can be crucial for the change in snow line and melting of glaciers impacting the hydroclimate of the Himalayas. Our results suggest that the influence of aerosol on modulating the regional precipitation and freezing level height can be significant for the hydroclimate of the Himalayan region in a daily to interannual timescale. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Aerosols loading; Freezing level height; Summer monsoon; The Himalayas
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183535
作者单位	Division of Atmospheric Sciences, Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512, United States; Atmospheric Sciences Graduate Program, University of Nevada, Reno, NV, United States
推荐引用方式 GB/T 7714	Adhikari P.,Mejia J.F.. Influence of aerosols on clouds, precipitation and freezing level height over the foothills of the Himalayas during the Indian summer monsoon[J],2021.
APA	Adhikari P.,&Mejia J.F..(2021).Influence of aerosols on clouds, precipitation and freezing level height over the foothills of the Himalayas during the Indian summer monsoon.Climate Dynamics.
MLA	Adhikari P.,et al."Influence of aerosols on clouds, precipitation and freezing level height over the foothills of the Himalayas during the Indian summer monsoon".Climate Dynamics (2021).