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A high resolution record of Greenland mass balance

By Malcolm McMillan, Amber Alexandra Leeson, Andrew Shepherd, Kate Briggs, Thomas W. K. Armitage, Anna Hogg, Peter Kuipers Munneke, Michiel Van Den Broeke, Noël Brice, Willem Jan van de Berg, Stefan Ligtenberg, Martin Horwath, Andreas Groh, Alan Muir and Lin Gilbert

Abstract

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 (3 cm/yr bias) with airborne measurements. With the aid of regional climate and firn modelling, 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 269 ± 51 Gt/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

Year: 2016
DOI identifier: 10.1002/2016GL069666
OAI identifier: oai:eprints.lancs.ac.uk:80262
Provided by: Lancaster E-Prints

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