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DOI	10.5194/acp-20-14377-2020
	Properties of ice cloud over Beijing from surface Ka-band radar observations during 2014-2017
	Huo J.; Tian Y.; Wu X.; Han C.; Liu B.; Bi Y.; Duan S.; Lyu D.
发表日期	2020
ISSN	1680-7316
起始页码	14377
结束页码	14392
卷号	20 期号:22
英文摘要	The physical properties and radiative role of ice clouds remain one of the uncertainties in the Earth-atmosphere system. In this study, we present a detailed analysis of ice cloud properties based on 4 years of surface millimeter-wavelength radar measurements in Beijing, China, where the summer monsoon from the ocean and the winter monsoon from the continent prevail alternately, resulting in various ice clouds. More than 6300 ice cloud clusters were studied to quantify the properties of ice clouds, such as the height, optical depth and horizontal extent, which can serve as a reference for parameterization and characterization in global climate models. In addition, comparison between ice cloud clusters formed under the summer monsoon and the winter monsoon indicates the different formation and evolution mechanisms of cirrus clouds. Statistically, temperatures of more than 95% of ice radar bins are below 15 C and more than 80% of ice clouds are above 7 km. The dependence of the radar reflectivity of ice particles on height and temperature was also observed in this study, indicating that the reflectivity of ice bins increases (decreases) as the temperature (height) increases. In addition, it is found that there is a strong linear relationship between the mean reflectivity and the ice cloud depth. Due to various synoptic circumstances, the ice clouds in summer are warmer, higher and thicker, with larger reflectivity than that in winter; in particular, the mean cloud-Top height of ice clouds in summer is 2.2 km higher than that in winter. Our analysis indicates that in spring, in situ-origin cirrus clouds are more common than liquid-origin cirrus clouds, while in summer liquid-origin cirrus clouds are more frequent; in autumn and winter, most cirrus clouds are of in situ origin. © 2020 BioMed Central Ltd.. All rights reserved.
语种	英语
scopus关键词	atmospheric convection; cloud cover; cloud microphysics; ice cover; satellite data; satellite imagery; Beijing [China]; China
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247335
作者单位	Key Laboratory of Middle Atmosphere and Global Environment Observation, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Huo J.,Tian Y.,Wu X.,et al. Properties of ice cloud over Beijing from surface Ka-band radar observations during 2014-2017[J],2020,20(22).
APA	Huo J..,Tian Y..,Wu X..,Han C..,Liu B..,...&Lyu D..(2020).Properties of ice cloud over Beijing from surface Ka-band radar observations during 2014-2017.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(22).
MLA	Huo J.,et al."Properties of ice cloud over Beijing from surface Ka-band radar observations during 2014-2017".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.22(2020).