气候变化领域集成服务门户(CCPortal): Competing aerosol effects in triggering deep convection over the Indian Region

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DOI	10.1007/s00382-020-05561-3
	Competing aerosol effects in triggering deep convection over the Indian Region
	Manoj M.G.; Lee S.-S.; Li Z.
发表日期	2021
ISSN	0930-7575
卷号	56 期号:2021-05-06
英文摘要	Contrasting direct and feedback effects of aerosols on deep convection in the Gangetic Plain of Indian subcontinent have been analyzed by employing observation and modeling framework during the Ganges Valley Aerosol Experiment conducted in 2011. The key question addressed in the current investigation is: while the aerosol direct radiative effect leads to reduced surface shortwave flux and possible stabilization of the lower atmosphere, how is the deep convection favored in a heavily polluted atmosphere? The composites of aerosol, cloud and meteorological parameters during the formation of deep convective clouds (DCCs) under both light- and heavy- pollution conditions are contrasted to elucidate the aerosol effects. An enhanced low-level warming is discernible due to the presence of heavily polluting absorbing aerosols. A seminal role of aerosols in increasing the moist static energy (MSE) through enhancement of internal energy is identified as a primary feature that increases the convection potential of the lower atmosphere. Concomitantly, the greater moisture convergence facilitated by dynamical feedback of enhanced low-level heating destabilizes the atmospheric stratification. Additionally, the microphysical invigoration is examined for any possible role, nevertheless, only a weakened invigoration could be observed possibly due to dominance of meteorology. The observed results are well supported by model simulation of a deep convective event under high- and low-aerosol backgrounds. Besides highlighting the dominance of radiative processes over microphysical processes under heavily polluted environment, the significant correlation between aerosol and high clouds observed during DCC formation under such conditions suggests that the aerosol direct effect in weakening convection could be overcome primarily through enhancement in MSE and concomitant moisture convergence. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
英文关键词	Aerosol; Cloud microphysics; Deep convection; Moist static energy; Radiative forcing
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/183368
作者单位	Advanced Centre for Atmospheric Radar Research, Cochin University of Science and Technology, Cochin, 682022, India; Department of Atmospheric and Oceanic Science & Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20740, United States
推荐引用方式 GB/T 7714	Manoj M.G.,Lee S.-S.,Li Z.. Competing aerosol effects in triggering deep convection over the Indian Region[J],2021,56(2021-05-06).
APA	Manoj M.G.,Lee S.-S.,&Li Z..(2021).Competing aerosol effects in triggering deep convection over the Indian Region.Climate Dynamics,56(2021-05-06).
MLA	Manoj M.G.,et al."Competing aerosol effects in triggering deep convection over the Indian Region".Climate Dynamics 56.2021-05-06(2021).