期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 13, 页码 7002-7010出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL069666
关键词
Greenland Ice Sheet; mass balance; altimetry; CryoSat-2; GRACE
资金
- UK Natural Environment Research Council
- Polar Program of the Netherlands Organization for Scientific Research (NWO)
- NERC [cpom30001, NE/N018044/1, NE/N018028/1] Funding Source: UKRI
- Natural Environment Research Council [1214401, NE/N018044/1, cpom30001, NE/N018001/1, ceh010010, NE/N018028/1, 1053020] Funding Source: researchfish
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.
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