Sources and physicochemical characteristics of blackcarbon aerosol from the southeastern Tibetan Plateau:internal mixing enhances light absorption

doi:10.5194/acp-18-4639-2018

CORC > 地球环境研究所 > 中国科学院地球环境研究所 > 粉尘与环境研究室

	Sources and physicochemical characteristics of blackcarbon aerosol from the southeastern Tibetan Plateau:internal mixing enhances light absorption
	Wang,QY(Wang,Qiyuan)2; Cao,JJ(Cao,Junji)2,4; Han,YM(Han,Yongming)1,2; Tian,J(Tian,Jie)3; Zhu,CS(Zhu,Chongshu)2; Zhang,YG(Zhang,Yonggang)2; Zhang,NN(Zhang,Ningning)2; Shen,ZX(Shen,Zhenxing)3; Ni,HY(Ni,Haiyan)2; Zhao,SY(Zhao,Shuyu)2
刊名	Atmospheric Chemistry and Physics
	2018
卷号	18 期号:2018 页码:4639-4656
DOI	10.5194/acp-18-4639-2018
文献子类	期刊论文
英文摘要	Black carbon (BC) aerosol has important effects on the climate and hydrology of the Tibetan Plateau (TP). An intensive measurement campaign was conducted at Lulang (∼3300ma.s.l. – above sea level), southeastern TP, from September to October 2015, to investigate the sources and physicochemical characteristics of refractory BC (rBC) aerosol. The average rBC mass concentration was 0.31±0.55µgm−3, which is higher than most prior results for BC on the TP. A clear diurnal cycle in rBC showed high values in the morning and low values in the afternoon. A bivariate polar plot showed that rBC loadings varied with wind speed and direction, which also reflected the dominant transport direction. The estimated net surface rBC transport intensity was +0.05±0.29µgs−1m−2, indicating stronger transport from outside the TP compared with its interior. Cluster analysis and a concentration-weighted trajectory model connected emissions from north India to the high rBC loadings, but the effects of internal TP sources should not be overlooked. The average mass median diameter (MMD) of rBC was 160±23nm, with smaller MMDs on rainy days (145nm) compared with non-rainy days (164nm). The average number fraction of thickly coated rBC (FrBC) was 39±8%, and it increased with the O3 mixing ratios from 10:00 to 14:00LT, indicating that photochemical oxidation played a role in forming rBC coatings. The average rBC absorption enhancement (Eabs) was estimated to be 1.9, suggesting that light absorption by coated rBC particles was greater than for uncoated ones. The Eabs was strongly positively correlated with the FrBC, indicating an amplification of light absorption for internally mixed rBC. For rBC cores <170nm, Eabs was negatively correlated with MMD, but it was nearly constant for rBC cores > 170nm. Our study provides insight into the sources and evolution of rBC aerosol on the TP, and the results should be useful for improving models of the radiative effects of carbonaceous aerosols in this area.
语种	英语
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5361]
专题	地球环境研究所_粉尘与环境研究室
通讯作者	Wang,Qiyuan
作者单位	1.School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an, 710049, China 2.Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China 3.Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi’an JiaotongUniversity, Xi’an, 710049, China 4.Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an, 710049, China
推荐引用方式 GB/T 7714	Wang,QY,Cao,JJ,Han,YM,et al. Sources and physicochemical characteristics of blackcarbon aerosol from the southeastern Tibetan Plateau:internal mixing enhances light absorption[J]. Atmospheric Chemistry and Physics,2018,18(2018):4639-4656.
APA	Wang,QY.,Cao,JJ.,Han,YM.,Tian,J.,Zhu,CS.,...&Wang,Qiyuan.(2018).Sources and physicochemical characteristics of blackcarbon aerosol from the southeastern Tibetan Plateau:internal mixing enhances light absorption.Atmospheric Chemistry and Physics,18(2018),4639-4656.
MLA	Wang,QY,et al."Sources and physicochemical characteristics of blackcarbon aerosol from the southeastern Tibetan Plateau:internal mixing enhances light absorption".Atmospheric Chemistry and Physics 18.2018(2018):4639-4656.