globalchange  > 气候变化事实与影响
Scopus记录号: 2-s2.0-85062728763
论文题名:
Increased Greenland melt triggered by large-scale, year-round cyclonic moisture intrusions
作者: Oltmanns M.; Straneo F.; Tedesco M.
刊名: Cryosphere
ISSN: 19940416
出版年: 2019
卷: 13, 期:3
起始页码: 815
结束页码: 825
语种: 英语
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).
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122653
Appears in Collections:气候变化事实与影响

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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

Recommended Citation:
Oltmanns M.,Straneo F.,Tedesco M.. Increased Greenland melt triggered by large-scale, year-round cyclonic moisture intrusions[J]. Cryosphere,2019-01-01,13(3)
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