Sources and physicochemical characteristics of black carbon 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 black carbon aerosol from the southeastern Tibetan Plateau: internal mixing enhances light absorption
	Zhu, Chongshu 3; Wang, Qiyuan 3; Cao, Junji 2,3; Han, Yongming 3,4; Tian, Jie 1; Zhang, Yonggang 3; Zhang, Ningning 3; Shen, Zhenxing 1; Ni, Haiyan 3; Zhao, Shuyu 3
刊名	ATMOSPHERIC CHEMISTRY AND PHYSICS
	2018-04-05
卷号	18 期号:7 页码:4639-4656
DOI	10.5194/acp-18-4639-2018
文献子类	Article
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 (similar to 3300 m a.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 +/- 0.55 mu g m(-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 +/- 0.29 mu g s(-1) m(-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 +/- 23 nm, with smaller MMDs on rainy days (145 nm) compared with non-rainy days (164 nm). The average number fraction of thickly coated rBC (F-rBC) was 39 +/- 8 %, and it increased with the O-3 mixing ratios from 10:00 to 14:00 LT, indicating that photochemical oxidation played a role in forming rBC coatings. The average rBC absorption enhancement (E-abs) was estimated to be 1.9, suggesting that light absorption by coated rBC particles was greater than for uncoated ones. The E-abs was strongly positively correlated with the F-rBC, indicating an amplification of light absorption for internally mixed rBC. For rBC cores < 170 nm, E-abs was negatively correlated with MMD, but it was nearly constant for rBC cores > 170 nm. 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.
WOS关键词	PARTICLE SOOT PHOTOMETER ; BROWN CARBON ; SIZE DISTRIBUTION ; CLIMATE-CHANGE ; COASTAL CITY ; SOUTH CHINA ; ICE CORE ; STATE ; GLACIER ; HIMALAYAS
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
WOS记录号	WOS:000429211100005
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5209]
专题	地球环境研究所_粉尘与环境研究室
作者单位	1.Xi An Jiao Tong Univ, Sch Energy & Power Engn, Dept Environm Sci & Engn, Xian 710049, Shaanxi, Peoples R China 2.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China 4.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Chongshu,Wang, Qiyuan,Cao, Junji,et al. Sources and physicochemical characteristics of black carbon aerosol from the southeastern Tibetan Plateau: internal mixing enhances light absorption[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(7):4639-4656.
APA	Zhu, Chongshu.,Wang, Qiyuan.,Cao, Junji.,Han, Yongming.,Tian, Jie.,...&Wu, Jiarui.(2018).Sources and physicochemical characteristics of black carbon aerosol from the southeastern Tibetan Plateau: internal mixing enhances light absorption.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(7),4639-4656.
MLA	Zhu, Chongshu,et al."Sources and physicochemical characteristics of black carbon aerosol from the southeastern Tibetan Plateau: internal mixing enhances light absorption".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.7(2018):4639-4656.