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DOI	10.1016/j.jes.2019.12.006
	Seasonality of carbonaceous aerosol composition and light absorption properties in Karachi, Pakistan
	Chen, Pengfei; Kang, Shichang; Gul, Chaman; Tripathee, Lekhendra; Wang, Xiaoxiang; Hu, Zhaofu; Li, Chaoliu; Pu, Tao
通讯作者	Kang, SC (通讯作者)
发表日期	2020
ISSN	1001-0742
EISSN	1878-7320
起始页码	286
结束页码	296
卷号	90
英文摘要	Characteristics of carbonaceous aerosol (CA) and its light absorption properties are limited in Karachi, which is one of the most polluted metropolitan cities in South Asia. This study presents a comprehensive measurement of seasonality of CA compositions and mass absorption cross-section (MAC) of elemental carbon (EC) and water-soluble organic carbon (WSOC) in total suspended particles (TSP) collected from February 2015 to March 2017 in the southwest part of Karachi. The average TSP, organic carbon (OC), and EC concentrations were extremely high with values as 391.0 +/- 217.0, 37.2 +/- 28.0, and 8.53 +/- 6.97 mg/m(3), respectively. These components showed clear seasonal variations with high concentrations occurring during fall and winter followed by spring and summer. SO42-, NO3-, K+, and NH4+ showed similar variations with CA, implying the significant influence on atmospheric pollutants from anthropogenic activities. Relatively lower OC/EC ratio (4.20 +/- 2.50) compared with remote regions further indicates fossil fuel combustion as a primary source of CA. Meanwhile, sea salt and soil dust are important contribution sources for TSP. The average MAC of EC (632 nm) and WSOC (365 nm) were 6.56 +/- 2.70 and 0.97 +/- 0.37 m(2)/g, respectively. MACEC is comparable to that in urban areas but lower than that in remote regions, indicating the significant influence of local emissions. MACWSOC showed opposite distribution with EC, further suggesting that OC was significantly affected by local fossil fuel combustion. In addition, dust might be an important factor increasing MACWSOC particularly during spring and summer. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
关键词	SOLUBLE ORGANIC-CARBON HIGH-ALTITUDE SITE CHEMICAL-COMPOSITION BLACK CARBON BROWN CARBON SOURCE APPORTIONMENT OPTICAL-PROPERTIES TIBETAN PLATEAU AMBIENT AIR ATMOSPHERIC-POLLUTION
英文关键词	Air pollution; Organic carbon; Elemental carbon; Light absorption; Pakistan
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000513920600027
来源期刊	JOURNAL OF ENVIRONMENTAL SCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259747
推荐引用方式 GB/T 7714	Chen, Pengfei,Kang, Shichang,Gul, Chaman,et al. Seasonality of carbonaceous aerosol composition and light absorption properties in Karachi, Pakistan[J]. 中国科学院青藏高原研究所,2020,90.
APA	Chen, Pengfei.,Kang, Shichang.,Gul, Chaman.,Tripathee, Lekhendra.,Wang, Xiaoxiang.,...&Pu, Tao.(2020).Seasonality of carbonaceous aerosol composition and light absorption properties in Karachi, Pakistan.JOURNAL OF ENVIRONMENTAL SCIENCES,90.
MLA	Chen, Pengfei,et al."Seasonality of carbonaceous aerosol composition and light absorption properties in Karachi, Pakistan".JOURNAL OF ENVIRONMENTAL SCIENCES 90(2020).