气候变化领域集成服务门户(CCPortal): Enhanced Light-Absorption of Black Carbon in Rainwater Compared With Aerosols Over the Northern Indian Ocean

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DOI	10.1029/2019JD031246
	Enhanced Light-Absorption of Black Carbon in Rainwater Compared With Aerosols Over the Northern Indian Ocean
	Budhavant K.; Andersson A.; Holmstrand H.; Bikkina P.; Bikkina S.; Satheesh S.K.; Gustafsson Ö.
发表日期	2020
ISSN	2169897X
卷号	125 期号:2
英文摘要	Black carbon (BC) aerosols affect climate, especially in high aerosol loading regions such as South Asia. A key uncertainty for the climate effects of BC is the evolution of light-absorbing properties in the atmosphere. Here, we present a year-round comparison of the mass absorption cross section (MAC; 678 nm) of BC in air (PM10) and rain, for samples collected at the Maldives Climate Observatory at Hanimaadhoo. We develop a filter-loading correction scheme for estimating BC absorption on filters used in high-volume samplers. The year-round average MAC678 of BC in the rain is almost twice (13.3 ± 4.2 m2/g) compared to the PM10 aerosol (7.2 ± 2.6 m2/g). A possible explanation is the elevated ratio of organic carbon (OC) to BC observed in rain particulate matter (9.4 ± 6.3) compared to in the aerosols (OC/BC 2.6 ± 1.4 and water-insoluble organic carbon/BC 1.2 ± 0.8), indicating a coating-enhancement effect. In addition to BC, we also investigated the MAC365 of water-soluble brown carbon in PM10 (0.4 ± 0.4 m2/g, at 365 nm). In contrast to BC, MAC365brown carbon relates to air mass history, showing higher values for samples from air originating over the South Asian landmass. Furthermore, calculated washout ratios are much lower for BC compared to OC and inorganic ions such as sulfate, implying a longer atmospheric lifetime for BC. The wet deposition flux for BC during the high loading winter was 3 times higher than during the wet summer, despite much less precipitation in the winter. ©2019. The Authors.
英文关键词	Asia; brown carbon; mass absorption cross section; washout ratios; wet deposition fluxes
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186211
作者单位	Department of Environment Science and Analytical Chemistry (ACES), and the Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Maldives Climate Observatory at Hanimaadhoo, Hanimaadhoo, Maldives; Centre for Atmospheric and Oceanic Sciences and Divecha Centre for Climate Change, Indian Institute of Sciences (IISc), Bangalore, India; CSIR-National Institute of Oceanography, Visakhapatnam, India
推荐引用方式 GB/T 7714	Budhavant K.,Andersson A.,Holmstrand H.,et al. Enhanced Light-Absorption of Black Carbon in Rainwater Compared With Aerosols Over the Northern Indian Ocean[J],2020,125(2).
APA	Budhavant K..,Andersson A..,Holmstrand H..,Bikkina P..,Bikkina S..,...&Gustafsson Ö..(2020).Enhanced Light-Absorption of Black Carbon in Rainwater Compared With Aerosols Over the Northern Indian Ocean.Journal of Geophysical Research: Atmospheres,125(2).
MLA	Budhavant K.,et al."Enhanced Light-Absorption of Black Carbon in Rainwater Compared With Aerosols Over the Northern Indian Ocean".Journal of Geophysical Research: Atmospheres 125.2(2020).