Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China
文献类型：期刊论文
| 作者 | Li, Jianjun1,5; Zhang, Qi1; Wang, Gehui3,4,5; Li, Jin5; Wu, Can4,5; Liu, Lang5; Wang, Jiayuan1,5; Jiang, Wenqing1; Li, Lijuan1,5; Ho, Kin Fai2,5 |
| 刊名 | ATMOSPHERIC CHEMISTRY AND PHYSICS
 |
| 出版日期 | 2020-04-27 |
| 卷号 | 20期号:8页码:4889-4904 |
| ISSN号 | 1680-7316 |
| DOI | 10.5194/acp-20-4889-2020 |
| 通讯作者 | Zhang, Qi(dkwzhang@ucdavis.edu) ; Wang, Gehui(ghwang@geo.ecnu.edu.cn) |
| 英文摘要 | Brown carbon (BrC) contributes significantly to aerosol light absorption and thus can affect the Earth's radiation balance and atmospheric photochemical processes. In this study, we examined the light absorption properties and molecular compositions of water-soluble (WS-BrC) and water-insoluble (WI-BrC) BrC in PM2.5 collected from a rural site in the Guanzhong Basin - a highly polluted region in northwest China. Both WS-BrC and WI-BrC showed elevated light absorption coefficients (Abs) in winter (4-7 times those in summer) mainly attributed to enhanced emissions from residential biomass burning (BB) for heating of homes. While the average mass absorption coefficients (MACs) at 365 nm (MAC(365)) of WS-BrC were similar between daytime and nighttime in summer (0.99 +/- 0.17 and 1.01 +/- 0.18 m(2) g(-1), respectively), the average MAC(365) of WI-BrC was more than a factor of 2 higher during daytime (2.45 +/- 1.14 m(2) g(-1)) than at night (1.18 +/- 0.36 m(2) g(-1)). This difference was partly attributed to enhanced photochemical formation of WI-BrC species, such as oxygenated polycyclic aromatic hydrocarbons (OPAHs). In contrast, the MACs of WS-BrC and WI-BrC were generally similar in winter and both showed few diel differences. The Abs of wintertime WS-BrC correlated strongly with relative humidity, sulfate and NO2, suggesting that aqueous-phase reaction is an important pathway for secondary BrC formation during the winter season in northwest China. Nitrophenols on average contributed 2.44 +/- 1.78% of the Abs of WS-BrC in winter but only 0.12 +/- 0.03% in summer due to faster photodegradation reactions. WS-BrC and WI-BrC were estimated to account for 0.83 +/- 0.23% and 0.53 +/- 0.33 %, respectively, of the total down-welling solar radiation in the ultraviolet (UV) range in summer, and 1.67 +/- 0.72% and 2.07 +/- 1.24 %, respectively, in winter. The total absorption by BrC in the UV region was about 55 %-79% relative to the elemental carbon (EC) absorption. |
| WOS关键词 | LIGHT-ABSORPTION PROPERTIES ; SECONDARY ORGANIC AEROSOL ; BIOMASS-BURNING EMISSIONS ; CHEMICAL-CHARACTERIZATION ; AROMATIC-COMPOUNDS ; MASS-SPECTROMETRY ; REFRACTIVE-INDEX ; NEW-DELHI ; PHOTOOXIDATION ; XIAN |
| 资助项目 | National Nature Science Foundation of China[41773117] ; National Nature Science Foundation of China[91644102] ; National Nature Science Foundation of China[41977332] ; National Nature Science Foundation of China[91543116] ; Youth Innovation Promotion Association CAS[2020407] |
| WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000529394700001 |
| 出版者 | COPERNICUS GESELLSCHAFT MBH |
| 资助机构 | National Nature Science Foundation of China ; Youth Innovation Promotion Association CAS |
| 源URL | [http://ir.ieecas.cn/handle/361006/14739]  |
| 专题 | 地球环境研究所_粉尘与环境研究室 |
| 通讯作者 | Zhang, Qi; Wang, Gehui |
| 作者单位 | 1.Univ Calif Davis, Dept Environm Toxicol, Davis, CA 95616 USA 2.Chinese Univ Hong Kong, Jockey Club Sch Publ Hlth & Primary Care, Hong Kong, Peoples R China 3.Inst Ecochongming, 3663 N Zhongshan Rd, Shanghai 200062, Peoples R China 4.East China Normal Univ, Sch Geog Sci, Minist Educ, Key Lab Geog Informat Sci, Shanghai 200241, Peoples R China 5.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Key Lab Aerosol Chem & Phys, Xian 710061, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Jianjun,Zhang, Qi,Wang, Gehui,et al. Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(8):4889-4904. |
| APA | Li, Jianjun.,Zhang, Qi.,Wang, Gehui.,Li, Jin.,Wu, Can.,...&Cao, Junji.(2020).Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(8),4889-4904. |
| MLA | Li, Jianjun,et al."Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.8(2020):4889-4904. |
入库方式： OAI收割
来源：地球环境研究所
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