气候变化领域集成服务门户(CCPortal): Synoptic conditions and atmospheric moisture pathways associated with virga and precipitation over coastal Adélie Land in Antarctica

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DOI	10.5194/tc-14-1685-2020
	Synoptic conditions and atmospheric moisture pathways associated with virga and precipitation over coastal Adélie Land in Antarctica
	Jullien N.; Vignon E.; Sprenger M.; Aemisegger F.; Berne A.
发表日期	2020
ISSN	19940416
起始页码	1685
结束页码	1702
卷号	14 期号:5
英文摘要	Precipitation falling over the coastal regions of Antarctica often experiences low-level sublimation within the dry katabatic layer. The amount of water that reaches the ground surface is thereby considerably reduced. This paper investigates the synoptic conditions and the atmospheric transport pathways of moisture that lead to either virga - when precipitation is completely sublimated - or actual surface precipitation events over coastal Adélie Land, East Antarctica. For this purpose, the study combines ground-based lidar and radar measurements at Dumont d'Urville station (DDU), Lagrangian back trajectories, Eulerian diagnostics of extratropical cyclones and fronts, and moisture source estimations. It is found that precipitating systems at DDU are associated with warm fronts of cyclones that are located to the west of Adélie Land. Virga - corresponding to 36 % of the hours with precipitation above DDU - and surface precipitation cases are associated with the same precipitating system but they correspond to different phases of the event. Virga cases more often precede surface precipitation. They sometimes follow surface precipitation in the warm sector of the cyclone's frontal system, when the associated cyclone has moved to the east of Adélie Land and the precipitation intensity has weakened. On their way to DDU, the air parcels that ultimately precipitate above the station experience a large-scale lifting across the warm front. The lifting generally occurs earlier in time and farther from the station for virga than for precipitation. It is further shown that the water contained in the snow falling above DDU during pre-precipitation virga has an oceanic origin farther away (about 30ĝˆ more to the west) from Adélie Land than the one contained in the snow that precipitates down to the ground surface. © 2020 Copernicus GmbH. All rights reserved.
英文关键词	atmospheric moisture; atmospheric transport; estimation method; Eulerian analysis; extratropical cyclone; katabatic flow; precipitation intensity; synoptic meteorology; Dumont dUrville
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202121
作者单位	Environmental Remote Sensing Laboratory (LTE), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland; Department of Geosciences, University of Fribourg, Fribourg, Switzerland; Institute for Atmospheric and Climate Science, ETH Zürich, Zürich, Switzerland
推荐引用方式 GB/T 7714	Jullien N.,Vignon E.,Sprenger M.,et al. Synoptic conditions and atmospheric moisture pathways associated with virga and precipitation over coastal Adélie Land in Antarctica[J],2020,14(5).
APA	Jullien N.,Vignon E.,Sprenger M.,Aemisegger F.,&Berne A..(2020).Synoptic conditions and atmospheric moisture pathways associated with virga and precipitation over coastal Adélie Land in Antarctica.Cryosphere,14(5).
MLA	Jullien N.,et al."Synoptic conditions and atmospheric moisture pathways associated with virga and precipitation over coastal Adélie Land in Antarctica".Cryosphere 14.5(2020).