气候变化领域集成服务门户(CCPortal): New insights into ice multiplication using remote-sensing observations of slightly supercooled mixed-phase clouds in the Arctic

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DOI	10.1073/pnas.2021387118
	New insights into ice multiplication using remote-sensing observations of slightly supercooled mixed-phase clouds in the Arctic
	Luke E.P.; Yang F.; Kollias P.; Vogelmann A.M.; Maahn M.
发表日期	2021
ISSN	00278424
卷号	118 期号:13
英文摘要	Secondary ice production (SIP) can significantly enhance ice particle number concentrations in mixed-phase clouds, resulting in a substantial impact on ice mass flux and evolution of cold cloud systems. SIP is especially important at temperatures warmer than −10 ◦C, for which primary ice nucleation lacks a significant number of efficient ice nucleating particles. However, determining the climatological significance of SIP has proved difficult using existing observational methods. Here we quantify the long-term occurrence of secondary ice events and their multiplication factors in slightly supercooled clouds using a multisensor, remote-sensing technique applied to 6 y of ground-based radar measurements in the Arctic. Further, we assess the potential contribution of the underlying mechanisms of rime splintering and freezing fragmentation. Our results show that the occurrence frequency of secondary ice events averages to <10% over the entire period. Although infrequent, the events can have a significant impact in a local region when they do occur, with up to a 1,000-fold enhancement in ice number concentration. We show that freezing fragmentation, which appears to be enhanced by updrafts, is more efficient for SIP than the better-known rime-splintering process. Our field observations are consistent with laboratory findings while shedding light on the phenomenon and its contributing factors in a natural environment. This study provides critical insights needed to advance parameterization of SIP in numerical simulations and to design future laboratory experiments. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Mixed-phase cloud; Radar Doppler spectra; Remote sensing; Secondary ice production
语种	英语
scopus关键词	Arctic; article; computer simulation; concentration (parameter); freezing; quantitative analysis; remote sensing; telecommunication
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180099
作者单位	Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY 11973, United States; School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80305, United States; Physical Sciences Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, United States
推荐引用方式 GB/T 7714	Luke E.P.,Yang F.,Kollias P.,et al. New insights into ice multiplication using remote-sensing observations of slightly supercooled mixed-phase clouds in the Arctic[J],2021,118(13).
APA	Luke E.P.,Yang F.,Kollias P.,Vogelmann A.M.,&Maahn M..(2021).New insights into ice multiplication using remote-sensing observations of slightly supercooled mixed-phase clouds in the Arctic.Proceedings of the National Academy of Sciences of the United States of America,118(13).
MLA	Luke E.P.,et al."New insights into ice multiplication using remote-sensing observations of slightly supercooled mixed-phase clouds in the Arctic".Proceedings of the National Academy of Sciences of the United States of America 118.13(2021).