气候变化领域集成服务门户(CCPortal): Seasonality of carbonaceous aerosol composition and light absorption properties in Karachi, Pakistan

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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 P.; Kang S.; Gul C.; Tripathee L.; Wang X.; Hu Z.; Li C.; Pu T.
发表日期	2020
ISSN	20711050
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 μg/m3, respectively. These components showed clear seasonal variations with high concentrations occurring during fall and winter followed by spring and summer. SO4 2−, 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 m2/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. © 2020
英文关键词	Air pollution; Elemental carbon; Light absorption; Organic carbon; Pakistan
语种	英语
scopus关键词	Journal of Environmental Sciences (China)
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158451
作者单位	State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou, 730000, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101, China; Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, CAS, Beijing, 100101, China; Reading Academy, Nanjing University of Information Science and Technology, Nanjing, Jiangsu 210044, China
推荐引用方式 GB/T 7714	Chen P.,Kang S.,Gul C.,et al. Seasonality of carbonaceous aerosol composition and light absorption properties in Karachi, Pakistan[J]. 中国科学院西北生态环境资源研究院,2020,90.
APA	Chen P..,Kang S..,Gul C..,Tripathee L..,Wang X..,...&Pu T..(2020).Seasonality of carbonaceous aerosol composition and light absorption properties in Karachi, Pakistan.,90.
MLA	Chen P.,et al."Seasonality of carbonaceous aerosol composition and light absorption properties in Karachi, Pakistan".90(2020).