气候变化领域集成服务门户(CCPortal): Increased variability in Greenland Ice Sheet runoff from satellite observations

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DOI	10.1038/s41467-021-26229-4
	Increased variability in Greenland Ice Sheet runoff from satellite observations
	Slater T.; Shepherd A.; McMillan M.; Leeson A.; Gilbert L.; Muir A.; Munneke P.K.; Noël B.; Fettweis X.; van den Broeke M.; Briggs K.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	Runoff from the Greenland Ice Sheet has increased over recent decades affecting global sea level, regional ocean circulation, and coastal marine ecosystems, and it now accounts for most of the contemporary mass imbalance. Estimates of runoff are typically derived from regional climate models because satellite records have been limited to assessments of melting extent. Here, we use CryoSat-2 satellite altimetry to produce direct measurements of Greenland’s runoff variability, based on seasonal changes in the ice sheet’s surface elevation. Between 2011 and 2020, Greenland’s ablation zone thinned on average by 1.4 ± 0.4 m each summer and thickened by 0.9 ± 0.4 m each winter. By adjusting for the steady-state divergence of ice, we estimate that runoff was 357 ± 58 Gt/yr on average – in close agreement with regional climate model simulations (root mean square difference of 47 to 60 Gt/yr). As well as being 21 % higher between 2011 and 2020 than over the preceding three decades, runoff is now also 60 % more variable from year-to-year as a consequence of large-scale fluctuations in atmospheric circulation. Because this variability is not captured in global climate model simulations, our satellite record of runoff should help to refine them and improve confidence in their projections. © 2021, The Author(s).
语种	英语
scopus关键词	climate modeling; CryoSat; global climate; observational method; regional climate; satellite altimetry; satellite data; seasonal variation; article; global climate; Greenland; ice sheet; runoff; seasonal variation; simulation; steady state; summer; winter; Arctic; Greenland; Greenland Ice Sheet
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250587
作者单位	Centre for Polar Observation and Modelling, School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom; Mullard Space Science Laboratory, Department of Space & Climate Physics, University College London, London, United Kingdom; Centre for Polar Observation and Modelling, Department of Earth Sciences, University College London, London, United Kingdom; Institute for Marine and Atmospheric research Utrecht, Utrecht University, Utrecht, Netherlands; SPHERES Research Unit, Department of Geography, University of Liège, Liège, Belgium
推荐引用方式 GB/T 7714	Slater T.,Shepherd A.,McMillan M.,et al. Increased variability in Greenland Ice Sheet runoff from satellite observations[J],2021,12(1).
APA	Slater T..,Shepherd A..,McMillan M..,Leeson A..,Gilbert L..,...&Briggs K..(2021).Increased variability in Greenland Ice Sheet runoff from satellite observations.Nature Communications,12(1).
MLA	Slater T.,et al."Increased variability in Greenland Ice Sheet runoff from satellite observations".Nature Communications 12.1(2021).