气候变化领域集成服务门户(CCPortal): Particle reflectivity and movements in cirrus clouds over Beijing from four years of Ka radar measurements

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DOI	10.1016/j.atmosres.2020.105211
	Particle reflectivity and movements in cirrus clouds over Beijing from four years of Ka radar measurements
	Huo J.; Han C.; Duan M.; Wu X.; Bi Y.; Tian Y.
发表日期	2021
ISSN	0169-8095
卷号	248
英文摘要	Cirrus clouds are ice clouds. Our understanding of the basic microscale physics of ice clouds is not yet adequate. In this study, interior physical properties of cirrus clouds over Beijing are investigated based on four years of continuous measurements of a Ka-band polar Doppler radar, which performs long-term observations with higher temporal resolution than the aircraft and the satellite. The probability distribution functions of radar reflectivity at various temperatures are presented and a positive correlation relationship between reflectivity and temperature is also found. In addition, the distributions of the particle Doppler velocity and particle movements in cirrus clouds are also revealed. According to the cloud-base temperature (CBT), all cirrus clouds are divided into three types [Cih: CBT < 273 K and CBH (cloud-base height) ≥ 258 K; Cim: CBT < 258 K and CBT > 235 K; Cil: CBT ≤ 235 K] in order to understand their formation mechanisms and possible differences. The results of investigation show that Cil has the lowest mean depth, the lowest mean and maximum reflectivity, and the lowest inhomogeneity among the three types of cirrus clouds, while Cih has the highest and Cim lies between the two. The reflectivity–temperature relationship is also different in the three types. In particular, for Cil, reflectivity varies little with the variation in temperature. The significant difference in microphysical properties and interior structures between Cil and Cih proves their different formation mechanisms. Cil, illustrating higher vertical uniformity, is likely generated by radiation cooling, while the other cirrus cloud types are generated differently. The results presented and analyzed in this study provide new knowledge regarding cirrus clouds in Beijing, a mid-latitude region, and a reference for related parameterization in global climate models. © 2020 The Author(s)
英文关键词	Cirrus cloud; Cloud origin; Microphysical properties; Particle movement; Radar; Reflectivity factor
语种	英语
scopus关键词	Climate models; Distribution functions; Doppler radar; Radar measurement; Reflection; Continuous measurements; Formation mechanism; Global climate model; Long term observations; Microphysical property; Positive correlations; Radar reflectivities; Temporal resolution; Clouds; cirrus; climate modeling; cloud microphysics; cloud radiative forcing; cooling; formation mechanism; physical property; reflectivity; Beijing [Beijing (ADS)]; Beijing [China]; China
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/141697
作者单位	Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Huo J.,Han C.,Duan M.,et al. Particle reflectivity and movements in cirrus clouds over Beijing from four years of Ka radar measurements[J],2021,248.
APA	Huo J.,Han C.,Duan M.,Wu X.,Bi Y.,&Tian Y..(2021).Particle reflectivity and movements in cirrus clouds over Beijing from four years of Ka radar measurements.Atmospheric Research,248.
MLA	Huo J.,et al."Particle reflectivity and movements in cirrus clouds over Beijing from four years of Ka radar measurements".Atmospheric Research 248(2021).