DOI: 10.5194/tc-10-1933-2016
Scopus记录号: 2-s2.0-84986294540
论文题名: On the recent contribution of the Greenland ice sheet to sea level change
作者: 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
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 5 起始页码: 1933
结束页码: 1946
语种: 英语
英文关键词: discharge
; GRACE
; gravity field
; grounding line
; ice flow
; ice sheet
; meltwater
; runoff
; sea level change
; snow cover
; Arctic
; Greenland
; Greenland Ice Sheet
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75089
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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
Recommended Citation:
Van Den Broeke M,R,, Enderlin E,et al. On the recent contribution of the Greenland ice sheet to sea level change[J]. Cryosphere,2016-01-01,10(5)