气候变化领域集成服务门户(CCPortal): A correlational study on size differentiated aerosols on monsoonal and pre-monsoonal cloud properties over the Indo Gangetic Basin

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DOI	10.1016/j.atmosres.2021.105796
	A correlational study on size differentiated aerosols on monsoonal and pre-monsoonal cloud properties over the Indo Gangetic Basin
	Jose S.; Mishra A.K.; Singh S.
发表日期	2021
ISSN	0169-8095
卷号	262
英文摘要	Particle size is a critical parameter in deciding the cloud condensation nuclei activation efficiency and hence largely influential in the cloud formation and dynamics. Here we study the size differentiated influence of aerosol optical depth (AOD) on cloud properties for the densely polluted Indo-Gangetic Basin (IGB) for a period of 2000–2017 using satellite observations. Terra on board MISR derived AOD for two size ranges, small (aerodynamic radius < 0.35 μm) and large (aerodynamic radius > 0.7 μm) are correlated with MODIS derived cloud properties such as cloud fraction (CF), cloud optical thickness (COT), cloud top pressure (CTP) and cloud effective radius – liquid (CER-Liq) for monsoon and pre monsoon period, over the study area. Our study reveals that the size differentiated aerosols interacts differently with the cloud properties sometimes even contrarily. Small aerosol particles have shown better correlation with cloud properties than coarser particle. Furthermore, estimation of aerosol indirect effect has shown that small particles favour the Twomey effect while large particles follow the anti Twomey effect over the IGB. The anti Twomey effect for large particles i.e., positive AOD-CER relationship could be due to the elevated absorbing aerosol over the region causing aerosol induced heating of the cloud. In order to understand the aerosol characteristics over the IGB region, AERONET datasets from four IGB stations have been analysed, which indicated the presence of increased amount of coarser mode particles and absorbing aerosols over the study region. Aerosol-cloud interactions (ACI) are often overshadowed by internal cloud dynamics and upper air meteorology. Cloud segregated analysis using ISCCP classification suggests that the dominant clouds such as cirrostratus and altostratus influences the correlation statistics considerably. Partial correlation studies on four meteorological parameters (RH, vertical velocity, U and V component of wind) have revealed that ACI is also influenced by the upper air dynamics, particularly during monsoon. © 2021 Elsevier B.V.
英文关键词	Aerosol optical depth; Aerosol size distribution; Aerosol-cloud interaction; Cloud effective radius; Coarse mode; Twomey effect
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236615
作者单位	Environmental Sciences and Biomedical Metrology Division, CSIR-National Physical Laboratory, -110012, New Delhi, India; Academy of Scientific and Innovative Research (AcSIR), AcSIR Headquarters CSIR-HRDC Campus, Ghaziabad, Uttar Pradesh 201002, India; School of Environmental Sciences, Jawaharlal Nehru University, -110067, New Delhi, India
推荐引用方式 GB/T 7714	Jose S.,Mishra A.K.,Singh S.. A correlational study on size differentiated aerosols on monsoonal and pre-monsoonal cloud properties over the Indo Gangetic Basin[J],2021,262.
APA	Jose S.,Mishra A.K.,&Singh S..(2021).A correlational study on size differentiated aerosols on monsoonal and pre-monsoonal cloud properties over the Indo Gangetic Basin.Atmospheric Research,262.
MLA	Jose S.,et al."A correlational study on size differentiated aerosols on monsoonal and pre-monsoonal cloud properties over the Indo Gangetic Basin".Atmospheric Research 262(2021).