气候变化领域集成服务门户(CCPortal): Airborne in situ measurements of aerosol size distributions and black carbon across the Indo-Gangetic Plain during SWAAMI-RAWEX

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DOI	10.5194/acp-20-8593-2020
	Airborne in situ measurements of aerosol size distributions and black carbon across the Indo-Gangetic Plain during SWAAMI-RAWEX
	Gogoi M.M.; Jayachandran V.N.; Vaishya A.; Babu S.N.S.; Satheesh S.K.; Moorthy K.K.
发表日期	2020
ISSN	1680-7316
起始页码	8593
结束页码	8610
卷号	20 期号:14
英文摘要	During the combined South-West Asian Aerosol-Monsoon Interactions and Regional Aerosol Warming Experiment (SWAAMI-RAWEX), collocated airborne measurements of aerosol number-size distributions in the size (diameter) regime 0.5 to 20 μ m and black carbon (BC) mass concentrations were made across the Indo-Gangetic Plain (IGP), for the first time, from three distinct locations, just prior to the onset of the Indian summer monsoon. These measurements provided an east-west transect of region-specific properties of aerosols as the environment transformed from mostly arid conditions of the western IGP (represented by Jodhpur, JDR) having dominance of natural aerosols to the central IGP (represented by Varanasi, VNS) having very high anthropogenic emissions, to the eastern IGP (represented by the coastal station Bhubaneswar, BBR) characterized by a mixture of the IGP outflow and marine aerosols. Despite these, the aerosol size distribution revealed an increase in coarse mode concentration and coarse mode mass fraction (fractional contribution to the total aerosol mass) with the increase in altitude across the entire IGP, especially above the well-mixed region. Consequently, both the mode radii and geometric mean radii of the size distributions showed an increase with altitude. However, near the surface and within the atmospheric boundary layer (ABL), the features were specific to the different subregions, with the highest coarse mode mass fraction (FMC ∼ 72 %) in the western IGP and highest accumulation fraction in the central IGP with the eastern IGP in between. The elevated coarse mode fraction is attributed to mineral dust load arising from local production as well as due to advection from the west. This was further corroborated by data from the Cloud-Aerosol Transport System (CATS) on board the International Space Station (ISS), which also revealed that the vertical extent of dust aerosols reached as high as 5 km during this period. Mass concentrations of BC were moderate (∼ 1 μ g m-3) with very little altitude variation up to 3.5 km, except over VNS where very high concentrations were seen near the surface and within the ABL. The BC-induced atmospheric heating rate was highest near the surface at VNS (∼ 0:81 K d-1), while showing an increasing pattern with altitude at BBR (∼ 0:35 K d-1 at the ceiling altitude). © 2020 Author(s).
语种	英语
scopus关键词	accumulation; aerosol; airborne survey; black carbon; boundary layer; dust; experimental study; in situ measurement; size distribution; 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/247635
作者单位	Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695022, India; School of Arts and Sciences, Global Centre for Environment and Energy, Ahmedabad University, Ahmedabad, 380009, India; Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru, 560012, India; Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru, 560012, India
推荐引用方式 GB/T 7714	Gogoi M.M.,Jayachandran V.N.,Vaishya A.,et al. Airborne in situ measurements of aerosol size distributions and black carbon across the Indo-Gangetic Plain during SWAAMI-RAWEX[J],2020,20(14).
APA	Gogoi M.M.,Jayachandran V.N.,Vaishya A.,Babu S.N.S.,Satheesh S.K.,&Moorthy K.K..(2020).Airborne in situ measurements of aerosol size distributions and black carbon across the Indo-Gangetic Plain during SWAAMI-RAWEX.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(14).
MLA	Gogoi M.M.,et al."Airborne in situ measurements of aerosol size distributions and black carbon across the Indo-Gangetic Plain during SWAAMI-RAWEX".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.14(2020).