A high-resolution record of Greenland mass balance

被引：118

作者：

McMillan, Malcolm ^{[1
]}

Leeson, Amber ^{[2
,3
]}

Shepherd, Andrew ^{[1
]}

Briggs, Kate ^{[1
]}

Armitage, Thomas W. K. ^{[4
]}

Hogg, Anna ^{[1
]}

Munneke, Peter Kuipers ^{[5
]}

van den Broeke, Michiel ^{[5
]}

Noel, Brice ^{[5
]}

van de Berg, Willem Jan ^{[5
]}

Ligtenberg, Stefan ^{[5
]}

Horwath, Martin ^{[6
]}

Groh, Andreas ^{[6
]}

Muir, Alan ^{[4
]}

Gilbert, Lin ^{[4
]}

机构：

[1] Univ Leeds, Ctr Polar Observat & Modelling, Leeds, W Yorkshire, England

[2] Univ Lancaster, Data Sci Inst, Lancaster, England

[3] Univ Lancaster, Lancaster Environm Ctr, Lancaster, England

[4] UCL, Ctr Polar Observat & Modelling, London, England

[5] Univ Utrecht, Inst Marine & Atmospher Res, Utrecht, Netherlands

[6] Tech Univ Dresden, Inst Planetare Geoadsie, Dresden, Germany

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 13期

基金：

英国自然环境研究理事会;

关键词：

Greenland Ice Sheet; mass balance; altimetry; CryoSat-2; GRACE; REGIONAL CLIMATE MODEL; TIME-VARIABLE GRAVITY; SEA-LEVEL RISE; ICE-SHEET; ELEVATION CHANGE; SURFACE MELT; GRACE; GLACIERS; INCREASE; IMPACT;

D O I：

10.1002/2016GL069666

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We map recent Greenland Ice Sheet elevation change at high spatial (5 km) and temporal (monthly) resolution using CryoSat-2 altimetry. After correcting for the impact of changing snowpack properties associated with unprecedented surface melting in 2012, we find good agreement (3cm/yr bias) with airborne measurements. With the aid of regional climate and firn modeling, we compute high spatial and temporal resolution records of Greenland mass evolution, which correlate (R=0.96) with monthly satellite gravimetry and reveal glacier dynamic imbalance. During 2011-2014, Greenland mass loss averaged 26951Gt/yr. Atmospherically driven losses were widespread, with surface melt variability driving large fluctuations in the annual mass deficit. Terminus regions of five dynamically thinning glaciers, which constitute less than 1% of Greenland's area, contributed more than 12% of the net ice loss. This high-resolution record demonstrates that mass deficits extending over small spatial and temporal scales have made a relatively large contribution to recent ice sheet imbalance.

引用

页码：7002 / 7010

页数：9

共 49 条

[1] Computations of the viscoelastic response of a 3-D compressible Earth to surface loading: an application to Glacial Isostatic Adjustment in Antarctica and Canada [J].