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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - A high resolution record of Greenland mass balance
AU - McMillan, Malcolm
AU - Leeson, Amber Alexandra
AU - Shepherd, Andrew
AU - Briggs, Kate
AU - Armitage, Thomas W. K.
AU - Hogg, Anna
AU - Kuipers Munneke, Peter
AU - Van Den Broeke, Michiel
AU - Brice, Noël
AU - van de Berg, Willem Jan
AU - Ligtenberg, Stefan
AU - Horwath, Martin
AU - Groh, Andreas
AU - Muir, Alan
AU - Gilbert, Lin
N1 - ©2016. American Geophysical Union. All Rights Reserved.
PY - 2016/7/16
Y1 - 2016/7/16
N2 - 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.
AB - 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.
KW - Greenland Ice Sheet
KW - mass balance
KW - altimetry
KW - CryoSat-2
KW - GRACE
U2 - 10.1002/2016GL069666
DO - 10.1002/2016GL069666
M3 - Journal article
VL - 43
SP - 7002
EP - 7010
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 13
ER -