气候变化领域集成服务门户(CCPortal): On the Frequency of Occurrence of the Ice Phase in Supercooled Southern Ocean Low Clouds Derived From CALIPSO and CloudSat

CCPortal

DOI	10.1029/2020GL087554
	On the Frequency of Occurrence of the Ice Phase in Supercooled Southern Ocean Low Clouds Derived From CALIPSO and CloudSat
	Mace G.G.; Benson S.; Hu Y.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	Supercooled liquid clouds are an important component of the albedo of the Southern Ocean (SO). While ice phase occurrence in liquid-dominant clouds (hereafter mixed phase) at temperatures warmer than the homogeneous freezing point is rare in the SO, the processes that create mixed-phase clouds are not understood. Using data from the CALIPSO lidar, we reconsider the thresholds of layer-integrated depolarization ratio and layer-integrated attenuated backscatter that are used to diagnose the phases of fully attenuating cloud layers. We argue that liquid-only clouds have understood physical bounds to these thresholds allowing for unique identification of layers that are not consistent with the presence of single-phase liquid tops. Compared to the original phase algorithm the application of these physically constrained thresholds results in a ~70% increase in mixed phase during the annual cycle considered. Combining the CALIPSO data with CloudSat data, mixed-phase clouds seem to typically cooccur with precipitation implying secondary ice forming processes. ©2020. The Authors.
英文关键词	Clouds; Ice; Liquids; Supercooling; Calipso lidars; Depolarization ratio; Freezing point; Mixed-phase cloud; Single-phase liquids; Southern ocean; Supercooled liquids; Unique identifications; Precipitation (meteorology); albedo; algorithm; backscatter; CALIPSO; cloud; CloudSat; freezing; frequency analysis; ice phenomena; lidar; satellite data; supercooling; Southern Ocean
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170064
作者单位	Department of Atmospheric Science, University of Utah, Salt Lake City, UT, United States; NASA Langley Research Center, Hampton, VA, United States
推荐引用方式 GB/T 7714	Mace G.G.,Benson S.,Hu Y.. On the Frequency of Occurrence of the Ice Phase in Supercooled Southern Ocean Low Clouds Derived From CALIPSO and CloudSat[J],2020,47(14).
APA	Mace G.G.,Benson S.,&Hu Y..(2020).On the Frequency of Occurrence of the Ice Phase in Supercooled Southern Ocean Low Clouds Derived From CALIPSO and CloudSat.Geophysical Research Letters,47(14).
MLA	Mace G.G.,et al."On the Frequency of Occurrence of the Ice Phase in Supercooled Southern Ocean Low Clouds Derived From CALIPSO and CloudSat".Geophysical Research Letters 47.14(2020).