气候变化领域集成服务门户(CCPortal): Impact of water vapor content on visibility: Fog-haze conversion and its implications to pollution control

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DOI	10.1016/j.atmosres.2021.105565
	Impact of water vapor content on visibility: Fog-haze conversion and its implications to pollution control
	Yang Y.; Ge B.; Chen X.; Yang W.; Wang Z.; Chen H.; Xu D.; Wang J.; Tan Q.; Wang Z.
发表日期	2021
ISSN	0169-8095
卷号	256
英文摘要	Atmospheric water vapor content, which reflects the total change of water vapor in the whole atmosphere, has an important effect on the atmospheric visibility (VIS). To investigate the variation of the VIS in Beijing during the past decades and to address the key factors affecting the VIS, the relationships of the VIS with the PM2.5 concentrations, the relative humidity (RH) and the total column water vapor (TCWV) have been explored in this study. The evolution characteristics of these factors in the fog-haze conversion process during the low-visibility (LVIS, VIS <10 km) events are also analyzed. Based on the relations between the TCWV and VIS, a novel method to distinguish haze and fog has been developed and employed in this study. The results show that the frequency of LVIS increases with the increasing of RH, TCWV and PM2.5 concentration. Under dry conditions (RH ≤ 40%), the VIS variation is mainly affected by the PM2.5 concentrations. Under moderate RH conditions (86% > RH > 40%), the VIS is more influenced by TCWV and RH. Under high RH and extremely low visibility conditions (RH > 86% and VIS <1 km), the water vapor is absorbed by aerosols, resulting in the conversion of haze to fog. This process leads to sharp decreases in TCWV and VIS, but an increase in PM2.5 concentrations simultaneously. This study provides a meaningful approach to identify the VIS evolution under the variations of RH, TCWV and PM2.5, which is helpful to the forecasting and early warning of LVIS events. © 2021 The Author(s)
英文关键词	Air pollution; Fog-haze conversion; Low-visibility; TCWV
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236784
作者单位	State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China; National Center for Climate Change Strategy and International Cooperation, Ministry of Ecology and Environment, Beijing, 100035, China
推荐引用方式 GB/T 7714	Yang Y.,Ge B.,Chen X.,et al. Impact of water vapor content on visibility: Fog-haze conversion and its implications to pollution control[J],2021,256.
APA	Yang Y..,Ge B..,Chen X..,Yang W..,Wang Z..,...&Wang Z..(2021).Impact of water vapor content on visibility: Fog-haze conversion and its implications to pollution control.Atmospheric Research,256.
MLA	Yang Y.,et al."Impact of water vapor content on visibility: Fog-haze conversion and its implications to pollution control".Atmospheric Research 256(2021).