气候变化领域集成服务门户(CCPortal): The dual-field-of-view polarization lidar technique: A new concept in monitoring aerosol effects in liquid-water clouds

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DOI	10.5194/acp-20-15265-2020
	The dual-field-of-view polarization lidar technique: A new concept in monitoring aerosol effects in liquid-water clouds - Case studies
	Jimenez C.; Ansmann A.; Engelmann R.; Donovan D.; Malinka A.; Seifert P.; Wiesen R.; Radenz M.; Yin Z.; Bühl J.; Schmidt J.; Barja B.; Wandinger U.
发表日期	2020
ISSN	1680-7316
起始页码	15265
结束页码	15284
卷号	20 期号:23
英文摘要	In a companion article (Jimenez et al., 2020), we introduced a new lidar method to derive microphysical properties of liquid-water clouds (cloud extinction coefficient, droplet effective radius, liquid-water content, cloud droplet number concentration Nd) at a height of 50-100m above the cloud base together with aerosol information (aerosol extinction coefficients, cloud condensation nuclei concentration NCCN) below the cloud layer so that detailed studies of the influence of given aerosol conditions on the evolution of liquid-water cloud layers with high temporal resolution solely based on lidar observations have become possible now. The novel cloud retrieval technique makes use of lidar observations of the volume linear depolarization ratio at two different receiver field of views (FOVs). In this article, Part 2, the new dual-FOV polarization lidar technique is applied to cloud measurements in pristine marine conditions at Punta Arenas in southern Chile. A multiwavelength polarization Raman lidar, upgraded by integrating a second polarization-sensitive channel to permit depolarization ratio observations at two FOVs, was used for these measurements at the southernmost tip of South America. Two case studies are presented to demonstrate the potential of the new lidar technique. Successful aerosol-cloud-interaction (ACI) studies based on measurements with the upgraded aerosol-cloud lidar in combination with a Doppler lidar of the vertical wind component could be carried out with 1 min temporal resolution at these pristine conditions. In a stratocumulus layer at the top of the convective boundary layer, we found values of Nd and NCCN (for 0.2% water supersaturation) ranging from 15-100 and 75-200 cm-3, respectively, during updraft periods. The studies of the aerosol impact on cloud properties yielded ACI values close to 1. The impact of aerosol water uptake on the ACI studies was analyzed with the result that the highest ACI values were obtained when considering aerosol proxies (light-extinction coefficient par or NCCN) measured at heights about 500m below the cloud base (and thus for dry aerosol conditions). © 2020 BMJ Publishing Group. All rights reserved.
英文关键词	aerosol; cloud droplet; cloud microphysics; cloud water; lidar; monitoring; polarization; stratocumulus; South America; Trachinotus falcatus
语种	英语
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/168901
作者单位	Leibniz Institute for Tropospheric Research, Leipzig, Germany; Royal Netherlands Meteorological Institute (KNMI), De Bilt, Netherlands; National Academy of Sciences of Belarus, Minsk, Belarus; School of Electronic Information, Wuhan University, Wuhan, China; Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, China; Institute of Meteorology, University of Leipzig, Leipzig, Germany; Atmospheric Research Laboratory, University of Magallanes, Punta Arenas, Chile
推荐引用方式 GB/T 7714	Jimenez C.,Ansmann A.,Engelmann R.,et al. The dual-field-of-view polarization lidar technique: A new concept in monitoring aerosol effects in liquid-water clouds - Case studies[J],2020,20(23).
APA	Jimenez C..,Ansmann A..,Engelmann R..,Donovan D..,Malinka A..,...&Wandinger U..(2020).The dual-field-of-view polarization lidar technique: A new concept in monitoring aerosol effects in liquid-water clouds - Case studies.Atmospheric Chemistry and Physics,20(23).
MLA	Jimenez C.,et al."The dual-field-of-view polarization lidar technique: A new concept in monitoring aerosol effects in liquid-water clouds - Case studies".Atmospheric Chemistry and Physics 20.23(2020).