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DOI	10.5194/acp-20-3931-2020
	Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter
	Liu Q.; Liu D.; Gao Q.; Tian P.; Wang F.; Zhao D.; Bi K.; Wu Y.; Ding S.; Hu K.; Zhang J.; Ding D.; Zhao C.
发表日期	2020
ISSN	1680-7316
起始页码	3931
结束页码	3944
卷号	20 期号:6
英文摘要	The water uptake of aerosol influences its optical depth and capacity for cloud formation, depending on the vertical profile of aerosol hygroscopicity because of different solar radiation received and supersaturation (SS) conditions at different atmospheric levels. Such information is lacking over the polluted East Asian region. This study presents aircraft-based in situ measured aerosol size distributions and chemical compositions by a series of flights over the Beijing area in wintertime. Under high relative humidity (hRH) conditions (surface RH > 60 %), a significant enhancement of aerosol hygroscopicity parameter (?) in the planetary boundary layer (PBL) was observed to increase by 50 % from 0.20 up to 0.34 from the surface to the top of the PBL (vertical gradient of ∼ 0:13 km-1), along with the dry particle effective diameter (Deff) being increased by 71 % and activation ratio up to 0.23 (0.64) at SS D 0:05% (0.1 %). However, a lower vertical gradient of (0.05 km-1) and smaller Deff was exhibited under low RH (lRH, surface RH < 60 %). This suggests that the aqueous processes played an important role in promoting the enhancement of particle hygroscopicity in the PBL. The in the lower free troposphere (LFT) was relatively stable at 0:24 ± 0:03 with a slight increase during regional transport. The enhancement of aerosol optical depth (AOD) due to water uptake ranged 1.0-1.22 for the PBL under lRH and LFT, but it reached as high as 6.4 in the PBL under hRH. About 80 % and 18 % of the AOD were contributed to by aerosol hygroscopic growth under hRH and lRH, respectively. These results emphasize the important evolution of aerosol water-uptake capacity in the PBL, especially under the high RH condition. © 2020 Author(s).
语种	英语
scopus关键词	aerosol composition; hygroscopicity; in situ measurement; optical depth; particle size; relative humidity; vertical distribution; water uptake; winter; Beijing [China]; China; North China Plain
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247874
作者单位	Beijing Weather Modification Office, Beijing, 100089, China; Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang, 310027, China; Institute of Urban Meteorology, Chinese Meteorological Administration, Beijing, 100089, China; Beijing Key Laboratory of Cloud Precipitation and Atmospheric Water Resources, Beijing, 100089, China; Field Experiment Base of Cloud and Precipitation Research in North China, China Meteorological Administration, Beijing, 101200, China; Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China
推荐引用方式 GB/T 7714	Liu Q.,Liu D.,Gao Q.,et al. Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter[J],2020,20(6).
APA	Liu Q..,Liu D..,Gao Q..,Tian P..,Wang F..,...&Zhao C..(2020).Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(6).
MLA	Liu Q.,et al."Vertical characteristics of aerosol hygroscopicity and impacts on optical properties over the North China Plain during winter".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.6(2020).