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Amplification of black carbon light absorption induced by atmospheric aging: Temporal variation at seasonal and diel scales in urban Guangzhou
Yin Sun, Jia1,2; Wu, Cheng1,2; Wu, Dui1,2,3; Cheng, Chunlei1,2; Li, Mei1,2; Li, Lei1,2; Deng, Tao3; Zhen Yu, Jian4,5,6; Jie Li, Yong7; Zhou, Qianni1,2; Liang, Yue1,2; Sun, Tianlin1,2; Song, Lang1,2; Cheng, Peng1,2; Yang, Wenda1,2; Pei, Chenglei8,9,10; Chen, Yanning10; Cen, Yanxiang11; Nian, Huiqing11; Zhou, Zhen1,2
2020-02-28
Source PublicationAtmospheric Chemistry and Physics
ISSN1680-7316
Volume20Issue:4Pages:2445-2470
Abstract

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.

DOI10.5194/acp-20-2445-2020
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS SubjectEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS IDWOS:000518197400006
Scopus ID2-s2.0-85080903478
Fulltext Access
FWCI2.625193
Citation statistics
Document TypeJournal article
CollectionDEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Corresponding AuthorWu, Cheng; Wu, Dui; Zhou, Zhen
Affiliation1.Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangzhou, 510632, China
2.Guangdong Prov. Engineering Research Center for Online Source Apportionment System of Air Pollution, Guangzhou, 510632, China
3.Institute of Tropical and Marine Meteorology, CMA, Guangzhou, 510080, China
4.Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong, Hong Kong
5.Division of Environment and Sustainability, Hong Kong University of Science and Technology, Hong Kong, Hong Kong
6.Atmospheric Research Center, HKUST Fok Ying Tung Research Institute, Guangzhou, 511400, China
7.Faculty of Science and Technology, University of Macau, Macao
8.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
9.University of Chinese Academy of Sciences, Beijing, 100049, China
10.Guangzhou Environmental Monitoring Center, Guangzhou, 510030, China
11.Guangzhou Hexin Analytical Instrument Company Limited, Guangzhou, 510530, China
Recommended Citation
GB/T 7714
Yin Sun, Jia,Wu, Cheng,Wu, Dui,et al. Amplification of black carbon light absorption induced by atmospheric aging: Temporal variation at seasonal and diel scales in urban Guangzhou[J]. Atmospheric Chemistry and Physics,2020,20(4):2445-2470.
APA Yin Sun, Jia,Wu, Cheng,Wu, Dui,Cheng, Chunlei,Li, Mei,Li, Lei,Deng, Tao,Zhen Yu, Jian,Jie Li, Yong,Zhou, Qianni,Liang, Yue,Sun, Tianlin,Song, Lang,Cheng, Peng,Yang, Wenda,Pei, Chenglei,Chen, Yanning,Cen, Yanxiang,Nian, Huiqing,&Zhou, Zhen.(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),2445-2470.
MLA Yin Sun, Jia,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):2445-2470.
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