Quantifying the effects of the microphysical properties of black carbon on the determination of brown carbon using measurements at multiple wavelengths

doi:10.5194/acp-24-427-2024

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	Quantifying the effects of the microphysical properties of black carbon on the determination of brown carbon using measurements at multiple wavelengths
	Luo, Jie 1; Li, Dan 1; Wang, Yuanyuan 1; Sun, Dandan 1; Hou, Weizhen 3; Ren, Jinghe 1; Wu, Hailing 3; Zhou, Peng 4; Qiu, Jibing 1,2
	2024-01-11
发表期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN	1680-7316
卷号	24 期号:1 页码:427-448
摘要	Methods based on the absorption angstrom ngstrom exponent (AAE) are widely used to estimate the absorption by brown carbon (BrC), and the estimated absorption by BrC can be significantly different from 0, even for pure black carbon (BC). However, few studies have systematically quantified the effects of BC microphysical properties. Moreover, the conditions under which AAE-based methods are applicable are still unclear. In this work, we used BC models partially coated with non-absorbing materials to calculate the total absorption. Since the total absorption is entirely due to BC, the estimated BrC absorption should be 0 if the retrieval methods are accurate. Thus, the ratio of the estimated BrC absorption to BC absorption (ABS BrC ) should be the proportion of the BC absorption that is incorrectly attributed to BrC. The results show that a BC AAE of 1 can generally provide reasonable estimates for freshly emitted BC, since ABS BrC is generally in the range of - 4.8 % to 2.7 % during that period. However, when BC aerosols are aged, ABS BrC can sometimes reach about 38.7 %. The wavelength dependence of the AAE (WDA) method does not necessarily improve the estimates; sometimes a negative ABS BrC of about - 40.8 % is found for partially coated BC. By combining simulations of a global chemical transport model, this work also quantified the effects of BC microphysical properties on BrC global aerosol absorption optical depth (AAOD) estimates. The AAE = 1 method sometimes leads to a misassigned global mean AAOD of about - 0.43- 0.46 x 10 - 3 if the BC aerosols have a complex morphology. The WDA method does not necessarily improve the estimates. In our cases, the WDA methods based on spherical models could lead to a global-mean misassigned AAOD range of about - 0.87 - 0.04 x 10 - 3 . At the regional scale, the AAE = 1 method sometimes leads to a distributed AAOD of about - 7.3 to 5.7 x 10 - 3 in some specific regions. Mie-theory-based WDA methods lead to an estimated AAOD error of about - 22 x 10 - 3 in some regions (e.g., East Asia). This work also showed that the misattributed BrC absorption would lead to substantial uncertainties in the estimation of the global direct radiative forcing (DRF) of absorbing aerosols from different sources.
DOI	10.5194/acp-24-427-2024
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2022YFB3902802] ; National Key R&D Program of China[42305148] ; National Key R&D Program of China[41871269] ; National Natural Science Foundation of China
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001168863300001
出版者	COPERNICUS GESELLSCHAFT MBH
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.204/handle/2XEOYT63/38837
专题	中国科学院计算技术研究所
通讯作者	Qiu, Jibing
作者单位	1.Zhejiang Lab, Hangzhou 311121, Zhejiang, Peoples R China 2.Inst Comp Technol, Chinese Acad Sci, Beijing 100190, Peoples R China 3.Aerosp Informat Res Inst, Chinese Acad Sci, State Environm Protect Key Lab Satellite Remote Se, Beijing 100101, Peoples R China 4.Henan Polytech Univ, Sch Surveying & Land Informat Engn, Jiaozuo 454000, Peoples R China
推荐引用方式 GB/T 7714	Luo, Jie,Li, Dan,Wang, Yuanyuan,et al. Quantifying the effects of the microphysical properties of black carbon on the determination of brown carbon using measurements at multiple wavelengths[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2024,24(1):427-448.
APA	Luo, Jie.,Li, Dan.,Wang, Yuanyuan.,Sun, Dandan.,Hou, Weizhen.,...&Qiu, Jibing.(2024).Quantifying the effects of the microphysical properties of black carbon on the determination of brown carbon using measurements at multiple wavelengths.ATMOSPHERIC CHEMISTRY AND PHYSICS,24(1),427-448.
MLA	Luo, Jie,et al."Quantifying the effects of the microphysical properties of black carbon on the determination of brown carbon using measurements at multiple wavelengths".ATMOSPHERIC CHEMISTRY AND PHYSICS 24.1(2024):427-448.