Improved estimation of PM2.5 brown carbon contributions to filter light attenuation
文献类型：期刊论文
| 作者 | Chow, Judith C.1,2,3; Chen, L-W Antony1,4; Wang, Xiaoliang1,3; Green, Mark C.1,3; Watson, John G.1,2,3 |
| 刊名 | PARTICUOLOGY
 |
| 出版日期 | 2021-06-01 |
| 卷号 | 56页码:1-9 |
| ISSN号 | 1674-2001 |
| 关键词 | Organic carbon Brown carbon Elemental carbon Black carbon Absorption Angstrom Exponent |
| DOI | 10.1016/j.partic.2021.01.001 |
| 通讯作者 | Chow, Judith C.(judith.chow@dri.edu) |
| 英文摘要 | Multiwavelength light attenuation measurements have been acquired as part of thermal/optical carbon analysis in the U.S. Chemical Speciation Network (CSN) and the Interagency Monitoring of PROtected Visual Environments (IMPROVE) network beginning in 2016. These are used to estimate PM2.5 brown carbon (BrC) contributions to light absorption at various wavelengths, a useful method for separating biomass burning contributions from other sources. Attenuation of light transmitted through the filter deviates from Beers Law as the mass of light absorbing materials increase. This study estimates the effects of these deviations with empirical adjustment factors applied to samples for CSN from 2016 to 2017 and for IMPROVE from 2016 to 2019. Accounting for the filter loading effect results in an annual average increase of similar to 6-7% BrC contribution to light attenuation: from 3.6% to 10.7% for the urban, more heavily loaded CSN samples; and from 23.7% to 29.5% for the non-urban IMPROVE samples. An alternative method is examined for BrC and black carbon (BC) adjustments by calculating the Absorption Angstrom Exponent (AAE) for BC (i.e., AAE(BC)) based on the ratios of 635 nm/780 nm light attenuation rather than assuming AAE(BC) of unity. These paired-wavelength calculations result in a median AAE(BC) of 0.76 for CSN and 0.8 for IMPROVE, with the majority of samples (i.e., 91% of CSN and 70% of IMPROVE) showing AAE(BC) < 1. By assuming negligible contributions from BrC to AAE at longer wavelengths, the amount of light attenuation at shorter wavelengths (e.g., 405 nm) where BrC is dominant can be calculated. The paired-wavelength method applied to the filter loading adjusted data has a greater effect on urban (fresh) than on non-urban (aged) aerosols, resulting in a factor of two increase in annual averaged BrC light attenuation (from 10.7% to 21.6%) for CSN and by a factor of 1.11 (from 29.5% to 32.7%) for IMPROVE samples. This result demonstrates the importance of particle loading and AAE correction on quantifying BrC light attenuation from multi-wavelength thermal/optical analysis. Published by Elsevier B.V. on behalf of Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. |
| 资助项目 | National Park Service IMPROVE Carbon Analysis Contract[P16PC00229] |
| WOS研究方向 | Engineering ; Materials Science |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE INC |
| WOS记录号 | WOS:000637319400001 |
| 资助机构 | National Park Service IMPROVE Carbon Analysis Contract |
| 源URL | [http://ir.ieecas.cn/handle/361006/16296]  |
| 专题 | 地球环境研究所_黄土与第四纪地质国家重点实验室（2010~） |
| 通讯作者 | Chow, Judith C. |
| 作者单位 | 1.Desert Res Inst, Div Atmospher Sci, Reno, NV 89512 USA 2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China 3.Univ Nevada, Grad Fac, Dept Atmospher Sci, Reno, NV 89557 USA 4.Univ Nevada, Sch Publ Hlth, Dept Environm & Occupat Hlth, Las Vegas, NV USA |
| 推荐引用方式 GB/T 7714 | Chow, Judith C.,Chen, L-W Antony,Wang, Xiaoliang,et al. Improved estimation of PM2.5 brown carbon contributions to filter light attenuation[J]. PARTICUOLOGY,2021,56:1-9. |
| APA | Chow, Judith C.,Chen, L-W Antony,Wang, Xiaoliang,Green, Mark C.,&Watson, John G..(2021).Improved estimation of PM2.5 brown carbon contributions to filter light attenuation.PARTICUOLOGY,56,1-9. |
| MLA | Chow, Judith C.,et al."Improved estimation of PM2.5 brown carbon contributions to filter light attenuation".PARTICUOLOGY 56(2021):1-9. |
入库方式： OAI收割
来源：地球环境研究所
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