Source apportionment of absorption enhancement of black carbon in different environments of China

被引：12

作者：

Zhang, Xiaorong ^{[1
]}

Zhu, Zhejing ^{[1
]}

Cao, Feiyan ^{[1
]}

Tiwari, Shani ^{[1
]}

Chen, Bing ^{[1
,2
]}

机构：

[1] Shandong Univ, Environm Res Inst, Qingdao 266237, Peoples R China

[2] Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2021年 / 755卷

关键词：

Black carbon; Absorption enhancement; Positive matrix factorization; Source apportionment; YANGTZE-RIVER DELTA; POSITIVE MATRIX FACTORIZATION; LIGHT-ABSORPTION; ELEMENTAL CARBON; AIR-POLLUTION; MIXING STATE; CHEMICAL CHARACTERISTICS; OPTICAL-PROPERTIES; URBAN ATMOSPHERE; BACKGROUND SITE;

D O I：

10.1016/j.scitotenv.2020.142685

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Black carbon (BC) is an important pollutant for both air quality and earth's radiation balance because of its strong absorption enhancement. The enhanced light absorption of BC caused by other pollutants is one of themost important sources of uncertainty in global radiative forcing. The light absorption of BC is highly dependent on the emission source and very few studies have been carried out for the source apportionment of BC absorption enhancement. Thus, with this objective, continuous measurements of particulate matter (PM2.5) were performed at three different sites: a traffic site in Nanjing, an urban site in Jinan, and a rural site in Yucheng; the BC absorption enhancement and its source contributionswere determined. The mass absorption cross-section (MAC) of BC aerosols was reduced after the removal of the coating material. The maximum MAC enhancement (EMAC) was found to be 2.25 +/- 0.5 at the rural site, followed by 2.07 +/- 0.7 at the urban site and 1.7 +/- 0.6 at the traffic site, suggesting an approximately double enhancement in BC absorption due to different coating materials. The source apportionment of absorption enhancement of BC analysis using the positive matrix factorization model suggests five major emission sources. Among them, secondary sources were the main source of EMAC at all the three siteswith a percentage contribution of 43.4% (rural site), 34.6% (traffic site), and 31% (urban site). However, other emission sources, such as biomass burning (21.1% at rural site) and vehicular emissions (33.8% at traffic site) also had a significant contribution to EMAC, suggesting that there could be large variations in BC absorption enhancement due to differences in emission sources together with aerosol aging processes. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：11

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