气候变化领域集成服务门户(CCPortal): Global Statistics of Ice Microphysical and Optical Properties at Tops of Optically Thick Ice Clouds

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DOI	10.1029/2019JD031811
	Global Statistics of Ice Microphysical and Optical Properties at Tops of Optically Thick Ice Clouds
	van Diedenhoven B.; Ackerman A.S.; Fridlind A.M.; Cairns B.; Riedi J.
发表日期	2020
ISSN	2169897X
卷号	125 期号:6
英文摘要	The sizes and shapes of ice crystals in clouds affect fundamental microphysical processes, such as sedimentation and aggregation, as well as their optical properties. The evolution of ice crystal size and shape depends on temperature and supersaturation, as well as on other processes that may lead to various coexisting complex shapes. Here we present a global assessment of collocated size and shape characteristics and shortwave scattering properties of ice crystals at the tops of optically thick clouds inferred from space-borne multiwavelength reflectance measurements and multiangle polarimetry. The results indicate systematic covariations of ice size, shape, and distortion, as well as variations with temperature that can be plausibly related to simplified ice crystal growth theory and in situ and laboratory data. This simplicity may be attributable to the temperature dependence of cloud top ice size and shapes commonly being dominated by vapor growth at conditions similar to those at cloud top. Such a conclusion may be viewed as somewhat surprising given the expectation that ice properties at cloud top will be an integral manifestation of processes occurring at lower levels within updrafts. We also find that, contrary to commonly used models, ice scattering asymmetry parameters decrease with increasing effective radius, reducing sensitivity of cloud reflectance to particle size. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	climate; ice clouds; ice growth; microphysics; optical properties
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186121
作者单位	Center for Climate System Research, Columbia University, New York, NY, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; Univ. Lille, CNRS, UMR 8518 - LOA - Laboratoire d’Optique Atmosphérique, Lille, France
推荐引用方式 GB/T 7714	van Diedenhoven B.,Ackerman A.S.,Fridlind A.M.,et al. Global Statistics of Ice Microphysical and Optical Properties at Tops of Optically Thick Ice Clouds[J],2020,125(6).
APA	van Diedenhoven B.,Ackerman A.S.,Fridlind A.M.,Cairns B.,&Riedi J..(2020).Global Statistics of Ice Microphysical and Optical Properties at Tops of Optically Thick Ice Clouds.Journal of Geophysical Research: Atmospheres,125(6).
MLA	van Diedenhoven B.,et al."Global Statistics of Ice Microphysical and Optical Properties at Tops of Optically Thick Ice Clouds".Journal of Geophysical Research: Atmospheres 125.6(2020).