气候变化领域集成服务门户(CCPortal): Amplification of black carbon light absorption induced by atmospheric aging: Temporal variation at seasonal and diel scales in urban Guangzhou

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DOI	10.5194/acp-20-2445-2020
	Amplification of black carbon light absorption induced by atmospheric aging: Temporal variation at seasonal and diel scales in urban Guangzhou
	Yin Sun J.; Wu C.; Wu D.; Cheng C.; Li M.; Li L.; Deng T.; Zhen Yu J.; Jie Li Y.; Zhou Q.; Liang Y.; Sun T.; Song L.; Cheng P.; Yang W.; Pei C.; Chen Y.; Cen Y.; Nian H.; Zhou Z.
发表日期	2020
ISSN	1680-7316
起始页码	2445
结束页码	2470
卷号	20 期号:4
英文摘要	Black carbon (BC) aerosols have been widely recognized as a vital climate forcer in the atmosphere. Amplification of light absorption can occur due to coatings on BC during atmospheric aging, an effect that remains uncertain in accessing the radiative forcing of BC. Existing studies on the absorption enhancement factor (Eabs) have poor coverage on both seasonal and diurnal scales. In this study, we applied a recently developed minimum R squared (MRS) method, which can cover both seasonal and diurnal scales, for Eabs quantification. Using field measurement data in Guangzhou, the aims of this study are to explore (1) the temporal dynamics of BC optical properties at seasonal (wet season, 31 July-10 September; dry season, 15 November 2017-15 January 2018) and diel scales (1h time resolution) in the typical urban environment and (2) the influencing factors on Eabs temporal variability. Mass absorption efficiency at 520nm by primary aerosols (MAEp520) determined by the MRS method exhibited a strong seasonality (8.6m2g-1 in the wet season and 16.8m2g-1 in the dry season). Eabs520 was higher in the wet season (1.51±0.50) and lower in the dry season (1.29±0.28). Absorption Ångström exponent (AAE470-660) in the dry season (1.46±0.12) was higher than that in the wet season (1.37±0.10). Collective evidence showed that the active biomass burning (BB) in the dry season effectively altered the optical properties of BC, leading to elevated MAE, MAEp and AAE in the dry season compared to those in the wet season. Diurnal Eabs520 was positively correlated with AAE470-660 (R2=0.71) and negatively correlated with the AE33 aerosol loading compensation parameter (k) (R2=0.74) in the wet season, but these correlations were significantly weaker in the dry season, which may be related to the impact of BB. This result suggests that during the wet season, the lensing effect was more likely dominating the AAE diurnal variability rather than the contribution from brown carbon (BrC). Secondary processing can affect Eabs diurnal dynamics. The Eabs520 exhibited a clear dependency on the ratio of secondary organic carbon to organic carbon (SOC/OC), confirming the contribution of secondary organic aerosols to Eabs; Eabs520 correlated well with nitrate and showed a clear dependence on temperature. This new finding implies that gas-particle partitioning of semivolatile compounds may potentially play an important role in steering the diurnal fluctuation of Eabs520. In the dry season, the diurnal variability in Eabs520 was associated with photochemical aging as evidenced by the good correlation (R2 =0.69) between oxidant concentrations (Ox = O3CNO2) and Eabs520. © 2020 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	absorption; aerosol; amplification; biomass burning; black carbon; optical property; radiative forcing; temporal variation; urban area; China; Guangdong; Guangzhou
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247953
作者单位	Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangzhou, 510632, China; Guangdong Prov. Engineering Research Center for Online Source Apportionment System of Air Pollution, Guangzhou, 510632, China; Institute of Tropical and Marine Meteorology, CMA, Guangzhou, 510080, China; Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, Hong Kong; Division of Environment and Sustainability, Hong Kong University of Science and Technology, Hong Kong, Hong Kong; Atmospheric Research Center, HKUST Fok Ying Tung Research Institute, Guangzhou, 511400, China; Faculty of Science and Technology, University of Macau, Macau; State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Guangzhou Environmental Monitoring Center, Guangzhou, 510030...
推荐引用方式 GB/T 7714	Yin Sun J.,Wu C.,Wu D.,et al. Amplification of black carbon light absorption induced by atmospheric aging: Temporal variation at seasonal and diel scales in urban Guangzhou[J],2020,20(4).
APA	Yin Sun J..,Wu C..,Wu D..,Cheng C..,Li M..,...&Zhou Z..(2020).Amplification of black carbon light absorption induced by atmospheric aging: Temporal variation at seasonal and diel scales in urban Guangzhou.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(4).
MLA	Yin Sun J.,et al."Amplification of black carbon light absorption induced by atmospheric aging: Temporal variation at seasonal and diel scales in urban Guangzhou".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.4(2020).