气候变化领域集成服务门户(CCPortal): Strong summer atmospheric rivers trigger Greenland ice sheet melt through spatially varying surface energy balance and cloud regimes

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DOI	10.1175/JCLI-D-19-0835.1
	Strong summer atmospheric rivers trigger Greenland ice sheet melt through spatially varying surface energy balance and cloud regimes
	Mattingly K.S.; Mote T.L.; Fettweis X.; As D.V.A.N.; Tricht K.V.A.N.; Lhermitte S.; Pettersen C.; Fausto R.S.
发表日期	2020
ISSN	0894-8755
起始页码	6809
结束页码	6832
卷号	33 期号:16
英文摘要	Mass loss from the Greenland Ice Sheet (GrIS) has accelerated over the past two decades, coincident with rapid Arctic warming and increasing moisture transport over Greenland by atmospheric rivers (ARs). Summer ARs affecting western Greenland trigger GrIS melt events, but the physical mechanisms through which ARs induce melt are not well understood. This study elucidates the coupled surface-atmosphere processes by which ARs force GrIS melt through analysis of the surface energy balance (SEB), cloud properties, and local- to synoptic-scale atmospheric conditions during strong summer AR events affecting western Greenland. ARs are identified in MERRA-2 reanalysis (1980-2017) and classified by integrated water vapor transport (IVT) intensity. SEB, cloud, and atmospheric data from regional climate model, observational, reanalysis, and satellite-based datasets are used to analyze melt-inducing physical processes during strong,.90th percentile ''AR901'' events. Near AR ''landfall,'' AR901 days feature increased cloud cover that reduces net shortwave radiation and increases net longwave radiation. As these oppositely signed radiative anomalies partly cancel during AR901 events, increased melt energy in the ablation zone is primarily provided by turbulent heat fluxes, particularly sensible heat flux. These turbulent heat fluxes are driven by enhanced barrier winds generated by a stronger synoptic pressure gradient combined with an enhanced local temperature contrast between cool over-ice air and the anomalously warm surrounding atmosphere. During AR901 events in northwest Greenland, anomalous melt is forced remotely through a clear-sky foehn regime produced by downslope flow in eastern Greenland. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Air; Atmospheric thermodynamics; Climate models; Energy balance; Glaciers; Heat flux; Interfacial energy; Atmospheric conditions; Greenland Ice Sheet; Integrated water vapors; Long-wave radiation; Physical mechanism; Regional climate modeling; Short-wave radiation; Turbulent heat fluxes; Ice; atmospheric moisture; cloud cover; energy balance; ice sheet; melt; spatial variation; summer; surface energy; trigger mechanism; Arctic; Greenland; Greenland Ice Sheet
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171190
作者单位	Climatology Research Laboratory, Department of Geography, University of Georgia, Athens, GA, United States; Laboratory of Climatology, Department of Geography, University of Liège, Liège, Belgium; Geological Survey of Denmark and Greenland, Copenhagen, Denmark; VITO Remote Sensing, Mol, Belgium; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands; Space Science and Engineering Center, University of Wisconsin-Madison, Madison, WI, United States; Institute of Earth, Ocean, and Atmospheric Sciences, Rutgers, State University of New Jersey, Piscataway, NJ, United States
推荐引用方式 GB/T 7714	Mattingly K.S.,Mote T.L.,Fettweis X.,et al. Strong summer atmospheric rivers trigger Greenland ice sheet melt through spatially varying surface energy balance and cloud regimes[J],2020,33(16).
APA	Mattingly K.S..,Mote T.L..,Fettweis X..,As D.V.A.N..,Tricht K.V.A.N..,...&Fausto R.S..(2020).Strong summer atmospheric rivers trigger Greenland ice sheet melt through spatially varying surface energy balance and cloud regimes.Journal of Climate,33(16).
MLA	Mattingly K.S.,et al."Strong summer atmospheric rivers trigger Greenland ice sheet melt through spatially varying surface energy balance and cloud regimes".Journal of Climate 33.16(2020).