The influence of photochemical aging on light absorption of atmospheric black carbon and aerosol single-scattering albedo

被引：38

作者：

Xu, Xuezhe ^{[1
,2
]}

Zhao, Weixiong ^{[1
]}

Qian, Xiaodong ^{[1
,2
]}

Wang, Shuo ^{[1
,2
]}

Fang, Bo ^{[1
]}

Zhang, Qilei ^{[1
,2
]}

Zhang, Weijun ^{[1
,2
,3
]}

Venables, Dean S. ^{[4
,5
]}

Chen, Weidong ^{[6
]}

Huang, Yong ^{[7
,8
]}

Deng, Xueliang ^{[7
,8
]}

Wu, Biwen ^{[7
,8
]}

Lin, Xinfeng ^{[8
,9
]}

Zhao, Sen ^{[8
,9
]}

Tong, Yingxiang ^{[8
,9
]}

机构：

[1] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Lab Atmospher Physicochem, Hefei 230031, Peoples R China

[2] Univ Sci & Technol China, Grad Sch, Hefei 230026, Anhui, Peoples R China

[3] Univ Sci & Technol China, Sch Environm Sci & Optoelect Technol, Hefei 230026, Anhui, Peoples R China

[4] Univ Coll Cork, Sch Chem, Cork, Ireland

[5] Univ Coll Cork, Environm Res Inst, Cork, Ireland

[6] Univ Littoral Cote dOpale, Lab Physicochimie Atmosphere, F-59140 Dunkerque, France

[7] Anhui Inst Meteorol Sci, Hefei 230031, Anhui, Peoples R China

[8] Shouxian Natl Climatol Observ, Shouxian 232200, Anhui, Peoples R China

[9] Anhui Shouxian Meteorol Bur, Shouxian 232200, Anhui, Peoples R China

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2018年 / 18卷 / 23期

基金：

中国国家自然科学基金;

关键词：

COMPLEX REFRACTIVE-INDEXES; IN-SITU MEASUREMENTS; OPTICAL-PROPERTIES; MIXING STATE; BROWN CARBON; PARTICLE MORPHOLOGY; ORGANIC AEROSOL; SOOT AEROSOLS; ENHANCEMENT; VOLATILITY;

D O I：

10.5194/acp-18-16829-2018

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Coating enhancement of black carbon (BC) light absorption (E-abs) is a large uncertainty in modelling direct radiative forcing (DRF) by BC. Reported E-abs values after atmospheric aging vary widely and the mechanisms responsible for enhancing BC absorption remain elusive. Here, we report on the direct field measurement of size-resolved mixing state, E-abs, and aerosol single-scattering albedo (SSA) at lambda = 532 nm at a rural site in east China from June to July 2016. Strong diurnal variability of E-abs, SSA, and O-x (O-x = NO2 + O-3, a proxy for atmospheric photochemical aging) was observed. A method that combined E-abs and SSA was developed to retrieve the fraction contribution of BC absorption (f(BC)), lensing-driven enhancement (f(Lens)), as well as the fractional contribution of coating absorption (fraction absorption contribution (f(Shell)), the coated shell diameter (D-Shell) and the imaginary part of the complex refractive index (CRI) of the shell (k(Shell))). Parameterization of E-abs and SSA captures much of the influence of BC coating and the particle absorption. In our measurements at this site, the results showed that the absorption amplification depended on the coating thickness and the absorption of coating materials, and photochemistry plays a role in modifying the absorption of BC-containing particles. The lensing-driven enhancement was reduced by light absorption of the shell. One implication of these findings is that the contribution of light-absorbing organic compounds (brown carbon, BrC) at a longer aging time should be included in climate models.

引用

页码：16829 / 16844

页数：16

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