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Sources and physicochemical characteristics of black carbon aerosol from the southeastern Tibetan Plateau: internal mixing enhances light absorption
Wang, Qiyuan1; Cao, Junji1,2; Han, Yongming1,3; Tian, Jie4; Zhu, Chongshu1; Zhang, Yonggang1; Zhang, Ningning1; Shen, Zhenxing4; Ni, Haiyan1; Zhao, Shuyu1; Wu, Jiarui1
2018-04-05
Source PublicationATMOSPHERIC CHEMISTRY AND PHYSICS
Volume18Issue:7Pages:4639-4656
SubtypeArticle
AbstractBlack 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 HeadingsScience & Technology ; Physical Sciences
DOI10.5194/acp-18-4639-2018
WOS KeywordPARTICLE SOOT PHOTOMETER ; BROWN CARBON ; SIZE DISTRIBUTION ; CLIMATE-CHANGE ; COASTAL CITY ; SOUTH CHINA ; ICE CORE ; STATE ; GLACIER ; HIMALAYAS
Indexed BySCI
Language英语
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000429211100005
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5209
Collection粉尘与环境研究室
Affiliation1.Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China
2.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Shaanxi, Peoples R China
3.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Shaanxi, Peoples R China
4.Xi An Jiao Tong Univ, Sch Energy & Power Engn, Dept Environm Sci & Engn, Xian 710049, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Wang, Qiyuan,Cao, Junji,Han, Yongming,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 Wang, Qiyuan.,Cao, Junji.,Han, Yongming.,Tian, Jie.,Zhu, Chongshu.,...&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 Wang, Qiyuan,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.
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