气候变化领域集成服务门户(CCPortal): Mixed-Phase Clouds and Precipitation in Southern Ocean Cyclones and Cloud Systems Observed Poleward of 64°S by Ship-Based Cloud Radar and Lidar

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DOI	10.1029/2020JD033626
	Mixed-Phase Clouds and Precipitation in Southern Ocean Cyclones and Cloud Systems Observed Poleward of 64°S by Ship-Based Cloud Radar and Lidar
	Alexander S.P.; McFarquhar G.M.; Marchand R.; Protat A.; Vignon É.; Mace G.G.; Klekociuk A.R.
发表日期	2021
ISSN	2169897X
卷号	126 期号:8
英文摘要	Mixed-phase clouds (MPCs), composed of both liquid and ice, are prevalent in Southern Ocean cyclones. A characterization of these clouds on fine vertical scales is required in order to understand the microphysical processes within these clouds, and for model and satellite evaluations over this region. We investigated three examples of cloud systems collected by ship-mounted remote-sensing instruments adjacent to East Antarctica at latitudes between 64°S and 69°S. These cases allow us to examine the properties of midlevel MPCs, with cloud tops between 2 and 6 km. Midlevel MPCs contain multiple layers of supercooled liquid water (SLW) embedded within ice during the passage of cyclones. SLW layers are capped by strong temperature inversions and are observed at temperatures as low as −31°C. Convective generating cells (GCs) are present inside supercooled liquid-topped midlevel MPCs. The horizontal extent, vertical extent, and maximum upward Doppler velocity of these GCs were 0.6–3.6 km, 0.7–1.0 km, and 0.5–1.0 m s−1, respectively, and are consistent with observations from previous lower-latitude studies. Ice precipitation is nearly ubiquitous, except in the thinnest clouds at the trailing end of the observed systems. Seeding of lower SLW layers from above leads to periods with either larger ice particles or greater ice precipitation rates. Periods of supercooled drizzle lasting up to 2 h were observed toward the end of two of the three cyclone systems. This supercooled drizzle turns into predominantly ice precipitation as the result of seeding by ice clouds located above the precipitating SLW layer. © 2021. Commonwealth of Australia. Journal of Geophysical Research: Atmospheres. © 2021. American Geophysical Union.
英文关键词	lidar; mixed-phase clouds; precipitation; radar; Southern Ocean
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/185319
作者单位	Australian Antarctic Division, Kingston, TAS, Australia; Australian Antarctic Program Partnership, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; Cooperative Institute for Mesoscale Meteorological Studies and the School of Meteorology, University of Oklahoma, Norman, OK, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Bureau of Meteorology, Melbourne, VIC, Australia; Environmental Remote Sensing Laboratory (LTE), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland; Laboratoire de Météorologie Dynamique IPSL, Sorbone Universités, CNRS, Paris, France; Department of Atmospheric Sciences, University of Utah, Salt Lake City, UT, United States
推荐引用方式 GB/T 7714	Alexander S.P.,McFarquhar G.M.,Marchand R.,et al. Mixed-Phase Clouds and Precipitation in Southern Ocean Cyclones and Cloud Systems Observed Poleward of 64°S by Ship-Based Cloud Radar and Lidar[J],2021,126(8).
APA	Alexander S.P..,McFarquhar G.M..,Marchand R..,Protat A..,Vignon É..,...&Klekociuk A.R..(2021).Mixed-Phase Clouds and Precipitation in Southern Ocean Cyclones and Cloud Systems Observed Poleward of 64°S by Ship-Based Cloud Radar and Lidar.Journal of Geophysical Research: Atmospheres,126(8).
MLA	Alexander S.P.,et al."Mixed-Phase Clouds and Precipitation in Southern Ocean Cyclones and Cloud Systems Observed Poleward of 64°S by Ship-Based Cloud Radar and Lidar".Journal of Geophysical Research: Atmospheres 126.8(2021).