气候变化领域集成服务门户(CCPortal): Elevation change of the Greenland Ice Sheet due to surface mass balance and firn processes, 1960-2014

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DOI	10.5194/tc-9-2009-2015
	Elevation change of the Greenland Ice Sheet due to surface mass balance and firn processes, 1960-2014
	Kuipers Munneke P.; Ligtenberg S.R.M.; Noël B.P.Y.; Howat I.M.; Box J.E.; Mosley-Thompson E.; McConnell J.R.; Steffen K.; Harper J.T.; Das S.B.; Van Den Broeke M.R.
发表日期	2015
ISSN	19940416
卷号	9 期号:6
英文摘要	Observed changes in the surface elevation of the Greenland Ice Sheet are caused by ice dynamics, basal elevation change, basal melt, surface mass balance (SMB) variability, and by compaction of the overlying firn. The last two contributions are quantified here using a firn model that includes compaction, meltwater percolation, and refreezing. The model is forced with surface mass fluxes and temperature from a regional climate model for the period 1960-2014. The model results agree with observations of surface density, density profiles from 62 firn cores, and altimetric observations from regions where ice-dynamical surface height changes are likely small. In areas with strong surface melt, the firn model overestimates density. We find that the firn layer in the high interior is generally thickening slowly (1-5 cm yr-1). In the percolation and ablation areas, firn and SMB processes account for a surface elevation lowering of up to 20-50 cm yr-1. Most of this firn-induced marginal thinning is caused by an increase in melt since the mid-1990s and partly compensated by an increase in the accumulation of fresh snow around most of the ice sheet. The total firn and ice volume change between 1980 and 2014 is estimated at -3295 ± 1030 km3 due to firn and SMB changes, corresponding to an ice-sheet average thinning of 1.96 ± 0.61 m. Most of this volume decrease occurred after 1995. The computed changes in surface elevation can be used to partition altimetrically observed volume change into surface mass balance and ice-dynamically related mass changes. © Author(s) 2015.
学科领域	elevation; estimation method; firn; glacial hydrology; ice movement; mass balance; model; percolation; regional climate; temporal analysis; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	elevation; estimation method; firn; glacial hydrology; ice movement; mass balance; model; percolation; regional climate; temporal analysis; 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/119792
作者单位	Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands; Department of Geography, College of Science, Swansea University, Singleton Park, Swansea, SA2 8PP, United Kingdom; Byrd Polar and Climate Research Center, Ohio State UniversityOH, United States; Geological Survey of Denmark and Greenland (GEUS), Copenhagen, 1350, Denmark; Department of Geography, Ohio State University, Columbus, OH, United States; Desert Research Institute, University of Nevada, Reno, NV, United States; Swiss Federal Research Institute WSL, Zürcherstrasse 111, Birmensdorf, 8903, Switzerland; Department of Geosciences, University of Montana, Missoula, MT, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
推荐引用方式 GB/T 7714	Kuipers Munneke P.,Ligtenberg S.R.M.,Noël B.P.Y.,et al. Elevation change of the Greenland Ice Sheet due to surface mass balance and firn processes, 1960-2014[J],2015,9(6).
APA	Kuipers Munneke P..,Ligtenberg S.R.M..,Noël B.P.Y..,Howat I.M..,Box J.E..,...&Van Den Broeke M.R..(2015).Elevation change of the Greenland Ice Sheet due to surface mass balance and firn processes, 1960-2014.Cryosphere,9(6).
MLA	Kuipers Munneke P.,et al."Elevation change of the Greenland Ice Sheet due to surface mass balance and firn processes, 1960-2014".Cryosphere 9.6(2015).