气候变化领域集成服务门户(CCPortal): On the recent contribution of the Greenland ice sheet to sea level change

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DOI	10.5194/tc-10-1933-2016
	On the recent contribution of the Greenland ice sheet to sea level change
	Van Den Broeke M.R.; Enderlin E.M.; Howat I.M.; Kuipers Munneke P.; Noël B.P.Y.; Jan Van De Berg W.; Van Meijgaard E.; Wouters B.
发表日期	2016
ISSN	19940416
卷号	10 期号:5
英文摘要	We assess the recent contribution of the Greenland ice sheet (GrIS) to sea level change. We use the mass budget method, which quantifies ice sheet mass balance (MB) as the difference between surface mass balance (SMB) and solid ice discharge across the grounding line (D). A comparison with independent gravity change observations from GRACE shows good agreement for the overlapping period 2002-2015, giving confidence in the partitioning of recent GrIS mass changes. The estimated 1995 value of D and the 1958-1995 average value of SMB are similar at 411 and 418Gt yr-1, respectively, suggesting that ice flow in the mid-1990s was well adjusted to the average annual mass input, reminiscent of an ice sheet in approximate balance. Starting in the early to mid-1990s, SMB decreased while D increased, leading to quasi-persistent negative MB. About 60% of the associated mass loss since 1991 is caused by changes in SMB and the remainder by D. The decrease in SMB is fully driven by an increase in surface melt and subsequent meltwater runoff, which is slightly compensated by a small ( < 3%) increase in snowfall. The excess runoff originates from low-lying (< 2000ma.s.l.) parts of the ice sheet; higher up, increased refreezing prevents runoff of meltwater from occurring, at the expense of increased firn temperatures and depleted pore space. With a 1991-2015 average annual mass loss of ∼ 0.47±0.23mm sea level equivalent (SLE) and a peak contribution of 1.2mm SLE in 2012, the GrIS has recently become a major source of global mean sea level rise. © Author(s) 2016.
学科领域	discharge; GRACE; gravity field; grounding line; ice flow; ice sheet; meltwater; runoff; sea level change; snow cover; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	discharge; GRACE; gravity field; grounding line; ice flow; ice sheet; meltwater; runoff; sea level change; snow cover; Arctic; Greenland; Greenland Ice Sheet
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/119593
作者单位	Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Climate Change Institute, School of Earth and Climate Sciences, University of Maine, Maine, United States; School of Earth Sciences, Byrd Polar and Climate Research Center, Ohio State University, United States; Royal Netherlands Meteorological Institute, De Bilt, Netherlands
推荐引用方式 GB/T 7714	Van Den Broeke M.R.,Enderlin E.M.,Howat I.M.,et al. On the recent contribution of the Greenland ice sheet to sea level change[J],2016,10(5).
APA	Van Den Broeke M.R..,Enderlin E.M..,Howat I.M..,Kuipers Munneke P..,Noël B.P.Y..,...&Wouters B..(2016).On the recent contribution of the Greenland ice sheet to sea level change.Cryosphere,10(5).
MLA	Van Den Broeke M.R.,et al."On the recent contribution of the Greenland ice sheet to sea level change".Cryosphere 10.5(2016).