气候变化领域集成服务门户(CCPortal): Altitude profiles of cloud condensation nuclei characteristics across the Indo-Gangetic Plain prior to the onset of the Indian summer monsoon

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DOI	10.5194/acp-20-561-2020
	Altitude profiles of cloud condensation nuclei characteristics across the Indo-Gangetic Plain prior to the onset of the Indian summer monsoon
	Nair Jayachandran V.; Nair Suresh Babu S.; Vaishya A.; Gogoi M.M.; Nair V.S.; Krishnakumari Satheesh S.; Krishna Moorthy K.
发表日期	2020
ISSN	1680-7316
起始页码	561
结束页码	576
卷号	20 期号:1
英文摘要	Concurrent measurements of the altitude profiles of the concentration of cloud condensation nuclei (CCN), as a function of supersaturation (ranging from 0.2% to 1.0 %), and aerosol optical properties (scattering and absorption coefficients) were carried out aboard an instrumented aircraft across the Indo-Gangetic Plain (IGP) just prior to the onset of the Indian summer monsoon (ISM) of 2016. The experiment was conducted under the aegis of the combined South-West Asian Aerosol-Monsoon Interactions and Regional Aerosol Warming Experiment (SWAAMI-RAWEX) campaign. The measurements covered coastal, urban and arid environments. In general, the CCN concentration was highest in the central IGP, decreasing spatially from east to west above the planetary boundary layer (PBL), which is ∼ 1.5 km for the IGP during pre-monsoon period. Despite this, the CCN activation efficiency at 0.4% supersaturation was, interestingly, the highest over the eastern IGP (∼ 72 %), followed by that in the west (∼ 61 %), and it was the least over the central IGP (∼ 24 %) within the PBL. In general, higher activation efficiency is noticed above the PBL than below it. The central IGP showed remarkably low CCN activation efficiency at all altitudes, which appears to be associated with high black carbon (BC) mass concentration there, indicating the role of anthropogenic sources in suppressing the CCN efficiency. These first-ever CCN measurements over the western IGP, encompassing "the Great Indian Desert" also known as "the Thar Desert", showed high CCN efficiency, ∼ 61% at 0.4% supersaturation, indicating the hygroscopic nature of the dust. The vertical structure of CCN properties is found to be air mass dependent, with higher activation efficiency even over the central IGP during the prevalence of marine air mass. Wet scavenging associated with precipitation episodes seems to have reduced the CCN activation efficiency below cloud level. An empirical relation has emerged between the CCN concentration and the scattering aerosol index (AI), which would facilitate the prediction of CCN from aerosol optical properties. © 2020 Author(s).
语种	英语
scopus关键词	aerosol; black carbon; boundary layer; cloud condensation nucleus; concentration (composition); monsoon; optical property; planetary atmosphere; summer; Gangetic Plain
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141606
作者单位	Space Physics Laboratory, Vikram Sarabhai Space Centre, Indian Space Research Organisation (ISRO PO), Thiruvananthapuram, India; School of Arts and Sciences, Ahmedabad University, Ahmedabad, India; Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru, India; Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru, India
推荐引用方式 GB/T 7714	Nair Jayachandran V.,Nair Suresh Babu S.,Vaishya A.,et al. Altitude profiles of cloud condensation nuclei characteristics across the Indo-Gangetic Plain prior to the onset of the Indian summer monsoon[J],2020,20(1).
APA	Nair Jayachandran V..,Nair Suresh Babu S..,Vaishya A..,Gogoi M.M..,Nair V.S..,...&Krishna Moorthy K..(2020).Altitude profiles of cloud condensation nuclei characteristics across the Indo-Gangetic Plain prior to the onset of the Indian summer monsoon.Atmospheric Chemistry and Physics,20(1).
MLA	Nair Jayachandran V.,et al."Altitude profiles of cloud condensation nuclei characteristics across the Indo-Gangetic Plain prior to the onset of the Indian summer monsoon".Atmospheric Chemistry and Physics 20.1(2020).