干旱区生态环境知识资源中心(Arid): Humidity and PM_(2.5) composition determine atmospheric light extinction in the arid region of northwest China

Arid

	Humidity and PM_(2.5) composition determine atmospheric light extinction in the arid region of northwest China
	Zhang Xiaoxiao; Ding Xiang; Talifu Dilinuer; Wang Xinming; Abulizi Abulikemu; Maihemuti Mailikezhati; Rekefu Suwubinuer
来源期刊	环境科学学报
ISSN	1001-0742
出版年	2021
卷号	100
英文摘要	Atmospheric visibility can directly reflect the air quality. In this study, we measured watersoluble ions (WSIs), organic and element carbon (OC and EC) in PM_(2.5) from September 2017 to August 2018 in Urumqi, NW China. The results show that SO_4~(2 -), NO_3~- and NH_4~+ were the major WSIs, together accounting for 7.32%-84.12% of PM_(2.5) mass. Total carbon (TC = OC + EC) accounted for 12.12% of PM_(2.5) mass on average. And OC/EC > 2 indicated the formation of secondary organic carbon (SOC). The levels of SO_4~(2 -), NO_3~- and NH_4~+ in low visibility days were much higher than those in high visibility days. Relative humidity (RH) played a key role in affecting visibility. The extinction coefficient (b ext) that estimated via Koschmieder formula with visibility was the highest in winter (1441.05 739.95 Mm ~(-1)), and the lowest in summer (128.58 58.00 Mm ~(-1)). The b ext that estimated via IMPROVE formula with PM_(2.5) chemical component was mainly contributed by (NH_4)_2 SO_4 and NH_4 NO_3 . The b ext values calculated by both approaches presented a good correlation with each other (R~2 = 0.87). Multiple linear regression (MLR) method was further employed to reconstruct the empirical regression model of visibility as a function of PM_(2.5) chemical components, NO_2 and RH. The results of source apportionment by Positive Matrix Factorization (PMF) model showed that residential coal combustion and vehicle emissions were the major sources of b ext .
英文关键词	Aerosol chemical composition Visibility IMPROVE Light extinction Source apportionment South of Urumqi
类型	Article
语种	英语
收录类别	CSCD
WOS类目	Environmental Sciences & Ecology
CSCD记录号	CSCD:6887678
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/354340
推荐引用方式 GB/T 7714	Zhang Xiaoxiao,Ding Xiang,Talifu Dilinuer,et al. Humidity and PM_(2.5) composition determine atmospheric light extinction in the arid region of northwest China[J],2021,100.
APA	Zhang Xiaoxiao.,Ding Xiang.,Talifu Dilinuer.,Wang Xinming.,Abulizi Abulikemu.,...&Rekefu Suwubinuer.(2021).Humidity and PM_(2.5) composition determine atmospheric light extinction in the arid region of northwest China.环境科学学报,100.
MLA	Zhang Xiaoxiao,et al."Humidity and PM_(2.5) composition determine atmospheric light extinction in the arid region of northwest China".环境科学学报 100(2021).