Arid
DOI10.1016/j.atmosenv.2018.07.002
Aerosol optical absorption coefficients at a rural site in Northwest China: The great contribution of dust particles
Wu, Xueqin1; Liu, Jun1; Wu, Yunfei2; Wang, Xin1; Yu, Xiaowei3; Shi, Jinsen1; Bi, Jianrong1; Huang, Zhongwei1; Zhou, Tian1; Zhang, Renjian2
通讯作者Wu, Yunfei ; Wang, Xin
来源期刊ATMOSPHERIC ENVIRONMENT
ISSN1352-2310
EISSN1873-2844
出版年2018
卷号189页码:145-152
英文摘要

An intensive measurement campaign was conducted at a rural site in Northwest China to investigate aerosol optical absorption properties, using the ground-based mobile facility of the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL). The average mass concentration of PM2.5 was 103 +/- 4 mu g m(-3) during the 20-day campaign in April 2014. Black carbon (BC) only accounted for similar to 0.4% of the PM2.5 on average, with the mean concentration of 443 +/- 12 ng m(-3) measured using a single particle soot photometer (SP2). The aerosol absorption coefficient (sigma(ap)) was 5.69 +/- 0.01 Mm(-1) on average, recorded by a multi-angle absorption photometer (S) at the wavelength of 637 nm. It showed a linear relationship with BC mass concentration during non-dust periods, especially at their diurnal peaks of 07:00-09:00 a.m. (local standard time), deriving a bulk mass absorption efficiency (MAE) for BC of 8.5 +/- 1.1 m(2) g(-1) . The sigma(ap) increased sharply during the dust storm, while the BC remained at a lower concentration than other moments, implying that the dust particles had a considerable contribution to light absorption. On average, dust particles accounted for 26.7% of the aerosol absorption and increased to 71.6% during the dust storm. The MAE of dust was calculated to be 0.014 +/- 0.00028 m(2) g(-1) , which was comparable to that measured in the downwind regions in East Asia. Based on the Mie theory for spherical particles, the refractive index (m) of natural mineral dust particles was estimated to be 1.50-0.0007i in Northwest China.


英文关键词Dust aerosol Black carbon Dust storm Mass absorption efficiency
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000440881600015
WOS关键词BLACK CARBON AEROSOL ; LIGHT-ABSORPTION ; MINERAL DUST ; BROWN CARBON ; ORGANIC-CARBON ; MIXING STATE ; ASIAN OUTFLOW ; EAST ; VARIABILITY ; SCATTERING
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
来源机构兰州大学 ; 中国科学院大气物理研究所
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/207938
作者单位1.Lanzhou Univ, Key Lab Semiarid Climate Change, Minist Educ, Coll Atmospher Sci, Lanzhou 730000, Gansu, Peoples R China;
2.Chinese Acad Sci, Inst Atmospher Phys, CAS Key Lab Reg Climate Environm Temperate East A, Beijing 100029, Peoples R China;
3.Minist Environm Protect, South China Inst Environm Sci, Guangzhou 510655, Guangdong, Peoples R China
推荐引用方式
GB/T 7714
Wu, Xueqin,Liu, Jun,Wu, Yunfei,et al. Aerosol optical absorption coefficients at a rural site in Northwest China: The great contribution of dust particles[J]. 兰州大学, 中国科学院大气物理研究所,2018,189:145-152.
APA Wu, Xueqin.,Liu, Jun.,Wu, Yunfei.,Wang, Xin.,Yu, Xiaowei.,...&Zhang, Renjian.(2018).Aerosol optical absorption coefficients at a rural site in Northwest China: The great contribution of dust particles.ATMOSPHERIC ENVIRONMENT,189,145-152.
MLA Wu, Xueqin,et al."Aerosol optical absorption coefficients at a rural site in Northwest China: The great contribution of dust particles".ATMOSPHERIC ENVIRONMENT 189(2018):145-152.
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