气候变化领域集成服务门户(CCPortal): Microphysics of fog bursting in polluted urban air

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DOI	10.1016/j.atmosenv.2021.118357
	Microphysics of fog bursting in polluted urban air
	Liu Q.; Wang Z.-Y.; Wu B.-G.; Liu J.-L.; Nie H.-H.; Chen D.-H.; Gultepe I.
发表日期	2021
ISSN	1352-2310
卷号	253
英文摘要	The goal of this work is to study sudden fog visibility (Vis) changes called fog bursting occurred during polluted urban air conditions. Fog bursting refers to a sudden drop of fog Vis below 500 m over 30 min. A comprehensive field observational campaign called Costal City Fog Microphysical Research (CCFMR) was carried out over the city of Tianjin, China during winter of 2016–2017. The six fog bursting cases occurred during the project suggest that droplet number concentration (Nd) and liquid water content (LWC) were higher than these of other conditions. The mass concentration of PM2.5 (NPM2.5) was also higher before the fog bursting events. The fog droplet spectra (FDS) followed a Junge distribution. During fog bursting events, Vis, surface air temperature (Ta) and dew point depression (Ta-Td) exhibited decreasing trends. On the other hand, mean and turbulence kinetic energy (MKE and TKE), as well as friction velocity (u∗) had increasing trends in time. After the fog bursting, environment stability changed from the neutral stage to weakly unstable stage, and fog became deeper and optically thicker. The FDS broadened drastically between 20 and 35 μm diameter, and smaller Nd increased up to 1 order of magnitude. It is concluded that fog bursting is positively affected by combination of decreasing Ta by radiative cooling, increasing RH, turbulence mixing, and high value of NPM2.5. Results from this work suggest that fog bursting conditions need to be studied in detail by numerical weather forecast (NWP) models that currently lack of these conditions. © 2021 Elsevier Ltd
关键词	Burst reinforcement Fog droplet spectra LWC PM2.5 Turbulence
语种	英语
scopus关键词	Fog; Kinetic energy; Kinetics; Radiative Cooling; Turbulence; Weather forecasting; Burst reinforcement; Bursting events; Condition; Droplet spectrums; Fog droplet spectrum; Liquid water content; Microphysics; PM$-2.5$; Tianjin; Urban air; Drops; air temperature; atmospheric pollution; dew point; fog; magnitude; numerical model; particulate matter; turbulence; water content; weather forecasting; air temperature; article; China; concentration (parameter); cooling; particulate matter 2.5; reinforcement; velocity; visibility; water content; weather; winter; China
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/248487
作者单位	Tianjin Key Laboratory for Oceanic Meteorology, Tianjin Meteorological Bureau, Tianjin, 300074, China; Tianjin Weather Modification Office, Tianjin, 300074, China; Laboratory of Straits Meteorology, Xiamen Meteorology Bureau, Xiamen, 361012, China; Met. Res. Division, Environ. and Climate Change Canada, Toronto, ON M3H 5T4, Canada; Faculty of Engineering and Applied Sci., Ontario Technical University, Oshawa, ON, Canada
推荐引用方式 GB/T 7714	Liu Q.,Wang Z.-Y.,Wu B.-G.,et al. Microphysics of fog bursting in polluted urban air[J],2021,253.
APA	Liu Q..,Wang Z.-Y..,Wu B.-G..,Liu J.-L..,Nie H.-H..,...&Gultepe I..(2021).Microphysics of fog bursting in polluted urban air.ATMOSPHERIC ENVIRONMENT,253.
MLA	Liu Q.,et al."Microphysics of fog bursting in polluted urban air".ATMOSPHERIC ENVIRONMENT 253(2021).