气候变化领域集成服务门户(CCPortal): Ramp-Like PM 2.5 Accumulation Process and Z-Less Similarity in the Stable Boundary Layer

CCPortal

DOI	10.1029/2019GL086530
	Ramp-Like PM 2.5 Accumulation Process and Z-Less Similarity in the Stable Boundary Layer
	Shi Y.; Hu F.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
英文摘要	Similar ramp-like structures exist in the time variations of surface PM2.5 accumulation during the four different heavy haze pollution processes in Beijing, from 3 November 2017 to 15 January 2018. Based on the ultrasonic anemometer observations at seven different altitudes on a 325 m tower, it is shown that turbulence momentum flux exchanges between different altitudes were very weak during the ramp period of PM2.5 concentration. Turbulence at the higher altitude associated with strong wind shear, occasionally mixed downward toward the surface, showing upside-down transportation of turbulent kinetic energy (TKE), especially during the rapid removal stage of the pollution. This was different from the traditional upward TKE transportation above the surface. Vertical distribution of nondimensionalized standard deviation of the horizontal velocity, vertical velocity, and potential temperature in the stable boundary layer within the ramp-like structure show obvious “z-less” similarity, independent of z, and almost equal to constants ((Formula presented.) / (Formula presented.) 3.9, (Formula presented.) / (Formula presented.) 1.52, and (Formula presented.) / (Formula presented.) 3.96). ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Boundary layers; Kinetic energy; Kinetics; Pollution; Turbulence; PM2.5; PM2.5 concentration; Potential temperature; Ramp structures; Stable boundary layer; Turbulent kinetic energy; Ultrasonic anemometer; Vertical distributions; Atmospheric thermodynamics; boundary layer; haze; kinetic energy; particulate matter; potential temperature; spatiotemporal analysis; turbulence; Beijing [China]; China
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170770
作者单位	State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Shi Y.,Hu F.. Ramp-Like PM 2.5 Accumulation Process and Z-Less Similarity in the Stable Boundary Layer[J],2020,47(3).
APA	Shi Y.,&Hu F..(2020).Ramp-Like PM 2.5 Accumulation Process and Z-Less Similarity in the Stable Boundary Layer.Geophysical Research Letters,47(3).
MLA	Shi Y.,et al."Ramp-Like PM 2.5 Accumulation Process and Z-Less Similarity in the Stable Boundary Layer".Geophysical Research Letters 47.3(2020).