气候变化领域集成服务门户(CCPortal): Hemispheric contrasts in ice formation in stratiform mixed-phase clouds: disentangling the role of aerosol and dynamics with ground-based remote sensing

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DOI	10.5194/acp-21-17969-2021
	Hemispheric contrasts in ice formation in stratiform mixed-phase clouds: disentangling the role of aerosol and dynamics with ground-based remote sensing
	Radenz M.; Bühl J.; Seifert P.; Baars H.; Engelmann R.; Barja González B.; Mamouri R.-E.; Zamorano F.; Ansmann A.
发表日期	2021
ISSN	1680-7316
起始页码	17969
结束页码	17994
卷号	21 期号:23
英文摘要	Multi-year ground-based remote-sensing datasets were acquired with the Leipzig Aerosol and Cloud Remote Observations System (LACROS) at three sites. A highly polluted central European site (Leipzig, Germany), a polluted and strongly dust-influenced eastern Mediterranean site (Limassol, Cyprus), and a clean marine site in the southern midlatitudes (Punta Arenas, Chile) are used to contrast ice formation in shallow stratiform liquid clouds. These unique, long-term datasets in key regions of aerosol-cloud interaction provide a deeper insight into cloud microphysics. The influence of temperature, aerosol load, boundary layer coupling, and gravity wave motion on ice formation is investigated. With respect to previous studies of regional contrasts in the properties of mixed-phase clouds, our study contributes the following new aspects: (1) sampling aerosol optical parameters as a function of temperature, the average backscatter coefficient at supercooled conditions is within a factor of 3 at all three sites. (2) Ice formation was found to be more frequent for cloud layers with cloud top temperatures above-15gC than indicated by prior lidar-only studies at all sites. A virtual lidar detection threshold of ice water content (IWC) needs to be considered in order to bring radar-lidar-based studies in agreement with lidar-only studies. (3) At similar temperatures, cloud layers which are coupled to the aerosol-laden boundary layer show more intense ice formation than decoupled clouds. (4) Liquid layers formed by gravity waves were found to bias the phase occurrence statistics below-15gC. By applying a novel gravity wave detection approach using vertical velocity observations within the liquid-dominated cloud top, wave clouds can be classified and excluded from the statistics. After considering boundary layer and gravity wave influences, Punta Arenas shows lower fractions of ice-containing clouds by 0.1 to 0.4 absolute difference at temperatures between-24 and-8gC. These differences are potentially caused by the contrast in the ice-nucleating particle (INP) reservoir between the different sites. © 2021 Martin Radenz et al.
语种	英语
scopus关键词	aerosol; cloud microphysics; ground-based measurement; ice crystal; remote sensing; stratiform cloud; water content; Chile; Cyprus; Germany; Leipzig; Limassol; Magallanes; Punta Arenas; Saxony
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/246379
作者单位	Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany; Atmospheric Research Laboratory, University of Magallanes, Punta Arenas, Chile; Department of Civil Engineering and Geomatics, Cyprus University of Technology of Technology, Limassol, Cyprus; ERATOSTHENES Centre of Excellence, Limassol, Cyprus
推荐引用方式 GB/T 7714	Radenz M.,Bühl J.,Seifert P.,et al. Hemispheric contrasts in ice formation in stratiform mixed-phase clouds: disentangling the role of aerosol and dynamics with ground-based remote sensing[J],2021,21(23).
APA	Radenz M..,Bühl J..,Seifert P..,Baars H..,Engelmann R..,...&Ansmann A..(2021).Hemispheric contrasts in ice formation in stratiform mixed-phase clouds: disentangling the role of aerosol and dynamics with ground-based remote sensing.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(23).
MLA	Radenz M.,et al."Hemispheric contrasts in ice formation in stratiform mixed-phase clouds: disentangling the role of aerosol and dynamics with ground-based remote sensing".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.23(2021).