Basin-scale partitioning of Greenland ice sheet mass balance components (2007-2011)

M.L. Andersen, L. Stenseng, H. Skourup, W. Colgan, S.A. Khan, S.S. Kristensen, S.B. Andersen, J.E. Box, A.P. Ahlstrøm, X. Fettweis, R. Forsberg

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

51 Citationer (Scopus)

Abstrakt

The current deficit in Greenland ice sheet mass balance is due to both a decrease in surface mass balance (SMB) input and an increase in ice discharge (D) output. While SMB processes are beginning to be well captured by observationally-constrained climate modeling, insight into D is relatively limited. We use InSAR-derived velocities, in combination with ice thickness observations, to quantify the mass flux (F) across a flux perimeter around the ice sheet at ~1700 m elevation. To quantify D, we correct F for SMB, as well as changes in volume due to ice dynamics, in the area downstream of the gate. Using a 1961-1990 reference climatology SMB field from the MAR regional climate model, we quantify ice sheet mass balance within eighteen basins. We find a 2007-2011 mean D of 515±57 Gtyr -1. We find a 2007-2011 mean total mass balance of -262±21 Gtyr -1, which is equal to a 0.73 mm yr -1 global sea level rise contribution. This mass loss is dominated by SMB, which accounts for 61% of mass loss in the basins where partitioning is possible.

OriginalsprogEngelsk
Sider (fra-til)89-95
Antal sider7
TidsskriftEarth and Planetary Science Letters
Vol/bind409
DOI
StatusUdgivet - 1 jan. 2015

Programområde

  • Programområde 5: Natur og klima

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