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DOI	10.1016/j.atmosenv.2020.117323
	Aerosol layers in the free troposphere and their seasonal variations as observed in Wuhan, China
	Shao J.; Yi F.; Yin Z.
发表日期	2020
ISSN	1352-2310
卷号	224
英文摘要	Free-tropospheric aerosol layers and their seasonal variation over Wuhan (30.5°N, 114.4°E), China, are presented based on a 532-nm polarization lidar measurements on 162 days from January through December 2013. Using the aerosol layer selection criterions, a total of 402 free-tropospheric aerosol layer events were identified. The bottom height of the aerosol layers below 2 km accounts for 68% of the total, while approximately 76% of the layer's top height ranges from 1 km to 4 km. Out of the 402 events, 269 (67%) are optically-thin layers with aerosol optical depth (AOD) less than 0.1. The free tropospheric AOD2-7 contribute ~13–31% to the AOD0-7 and the free-tropospheric aerosol layers show considerable moderate variation. The aerosol layers have the maximum mean geometrical thickness of 1.2 km in spring, while the minimum mean thickness is 0.7 km in autumn, and the mean thickness is 0.93 km and 1 km in summer and winter, respectively. The mean backscatter coefficient of aerosol layers during spring, summer, autumn and winter were 1.8 ± 1.4 Mm−1sr−1, 2.3 ± 2 Mm−1sr−1, 2.8 ± 2.7 Mm−1sr−1 and 2.3 ± 2.2 Mm−1sr−1, respectively. Aerosol layers in different seasonal are classified by particle depolarization ratio, there are a large amount of non-spherical particles and mixed particles present in spring, autumn and winter, and the mean particle polarization ratio of aerosol layers during spring, summer, autumn and winter were 0.22, 0.06, 0.15 and 0.14, respectively. © 2020 Elsevier Ltd
关键词	Aerosol layer Free troposphere Lidar Planetary boundary layer
语种	英语
scopus关键词	Boundary layers; Depolarization; Optical radar; Polarization; Troposphere; Aerosol layers; Aerosol optical depths; Backscatter coefficients; Free troposphere; Nonspherical particle; Particle depolarization ratios; Planetary boundary layers; Tropospheric aerosols; Aerosols; aerosol; geometry; lidar; optical depth; particulate matter; polarization; seasonal variation; troposphere; aerosol; article; autumn; boundary layer; China; depolarization; optical depth; polarization; seasonal variation; spring; summer; thickness; troposphere; winter; China; Hubei; Wuhan
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249283
作者单位	School of Electronic Information, Wuhan University, Wuhan, China; Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, China; State Observatory for Atmospheric Remote Sensing, Wuhan, China
推荐引用方式 GB/T 7714	Shao J.,Yi F.,Yin Z.. Aerosol layers in the free troposphere and their seasonal variations as observed in Wuhan, China[J],2020,224.
APA	Shao J.,Yi F.,&Yin Z..(2020).Aerosol layers in the free troposphere and their seasonal variations as observed in Wuhan, China.ATMOSPHERIC ENVIRONMENT,224.
MLA	Shao J.,et al."Aerosol layers in the free troposphere and their seasonal variations as observed in Wuhan, China".ATMOSPHERIC ENVIRONMENT 224(2020).