气候变化领域集成服务门户(CCPortal): Increased Greenland melt triggered by large-scale, year-round cyclonic moisture intrusions

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DOI	10.5194/tc-13-815-2019
	Increased Greenland melt triggered by large-scale, year-round cyclonic moisture intrusions
	Oltmanns M.; Straneo F.; Tedesco M.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	815
结束页码	825
卷号	13 期号:3
英文摘要	Surface melting is a major driver of Greenland's mass loss. Yet, the mechanisms that trigger melt are still insufficiently understood because seasonally based studies blend processes initiating melt with positive feedbacks. Here, we focus on the triggers of melt by examining the synoptic atmospheric conditions associated with 313 rapid melt increases, detected in a satellite-derived melt extent product, equally distributed throughout the year over the period 1979- 2012. By combining reanalysis and weather station data, we show that melt is initiated by a cyclone-driven, southerly flow of warm, moist air, which gives rise to large-scale precipitation. A decomposition of the synoptic atmospheric variability over Greenland suggests that the identified, melt-triggering weather pattern accounts for ∼ 40% of the net precipitation, but increases in the frequency, duration and areal extent of the initiated melting have shifted the line between mass gain and mass loss as more melt and rainwater run off or accumulate in the snowpack. Using a regional climate model, we estimate that the initiated melting more than doubled over the investigated period, amounting to ∼ 28% of the overall surface melt and revealing that, despite the involved mass gain, year-round precipitation events are participating in the ice sheet's decline. © 2019 Author(s).
学科领域	atmospheric forcing; climate modeling; cyclone; decomposition; decomposition analysis; melting; moisture content; precipitation (climatology); rainwater; regional climate; satellite altimetry; snowpack; weather station; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	atmospheric forcing; climate modeling; cyclone; decomposition; decomposition analysis; melting; moisture content; precipitation (climatology); rainwater; regional climate; satellite altimetry; snowpack; weather station; Arctic; Greenland; Greenland Ice Sheet
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118914
作者单位	Ocean Circulation and Climate Dynamics, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Climate, Atmospheric Science and Physical Oceanography, Scripps Institution of Oceanography, San Diego, CA, United States; Marine Geology and Geophysics, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Sciences and Exploration Dir., NASA Goddard Institute for Space Studies, New York, NY, United States
推荐引用方式 GB/T 7714	Oltmanns M.,Straneo F.,Tedesco M.. Increased Greenland melt triggered by large-scale, year-round cyclonic moisture intrusions[J],2019,13(3).
APA	Oltmanns M.,Straneo F.,&Tedesco M..(2019).Increased Greenland melt triggered by large-scale, year-round cyclonic moisture intrusions.The Cryosphere,13(3).
MLA	Oltmanns M.,et al."Increased Greenland melt triggered by large-scale, year-round cyclonic moisture intrusions".The Cryosphere 13.3(2019).