气候变化领域集成服务门户(CCPortal): Ice crystal characterization in cirrus clouds III: retrieval of ice crystal shape and roughness from observations of halo displays

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DOI	10.5194/acp-22-15179-2022
	Ice crystal characterization in cirrus clouds III: retrieval of ice crystal shape and roughness from observations of halo displays
	Forster, Linda; Mayer, Bernhard
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	15179
结束页码	15205
卷号	22 期号:23 页码:27
英文摘要	In this study, which is the third part of the HaloCam series after , we present a novel technique to retrieve quantitative information about ice crystal optical and microphysical properties using ground-based imaging observations of halo displays. Comparing HaloCam's calibrated RGB images of 22 and 46 & LCIRC; halo observations against a lookup table of simulated radiances, this technique allows the retrieval of the sizes and shapes of randomly oriented crystals as well as the fraction of smooth and rough ice crystals for cirrus clouds. We analyzed 4400 HaloCam images between September 2015 and November 2016 showing a visible 22 & LCIRC; halo. The optical properties of hexagonal 8-element aggregates of columns with a mean ice crystal effective radius of about 20 mu m and a mixture of 37 % smooth and 63 % rough crystals on average best match the HaloCam observations. Implemented on different sites, HaloCam in combination with the machine-learning-based halo detection algorithm HaloForest can provide a consistent dataset for climatological studies of ice crystal properties representing typical cirrus clouds. Representative ice crystal optical properties are required for remote sensing of cirrus clouds as well as climate modeling. Since ground-based passive imaging observations provide information about the forward scattering part of the ice crystal optical properties, the results of this work ideally complement the results of satellite-based and airborne studies.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000892582600001
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/273098
作者单位	University of Munich; Helmholtz Association; German Aerospace Centre (DLR)
推荐引用方式 GB/T 7714	Forster, Linda,Mayer, Bernhard. Ice crystal characterization in cirrus clouds III: retrieval of ice crystal shape and roughness from observations of halo displays[J],2022,22(23):27.
APA	Forster, Linda,&Mayer, Bernhard.(2022).Ice crystal characterization in cirrus clouds III: retrieval of ice crystal shape and roughness from observations of halo displays.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(23),27.
MLA	Forster, Linda,et al."Ice crystal characterization in cirrus clouds III: retrieval of ice crystal shape and roughness from observations of halo displays".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.23(2022):27.