Timing and origin of recent regional ice-mass loss in Greenland

Sasgen, Ingo; van den Broeke, M.; Bamber, J. L.; Rignot, E.; Sørensen, L.; Wouters, B.; Martinec, Z.; Velicogna, I.; Simonsen, S. B.

doi:10.1016/j.epsl.2012.03.033

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Timing and origin of recent regional ice-mass loss in Greenland

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Sasgen, Ingo
1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

van den Broeke, M.
External Organizations;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Bamber, J. L.
External Organizations;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Rignot, E.
External Organizations;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Sørensen, L.
External Organizations;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Wouters, B.
External Organizations;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Martinec, Z.
External Organizations;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Velicogna, I.
External Organizations;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

Simonsen, S. B.
External Organizations;
Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum;

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Zitation

Sasgen, I., van den Broeke, M., Bamber, J. L., Rignot, E., Sørensen, L., Wouters, B., Martinec, Z., Velicogna, I., Simonsen, S. B. (2012): Timing and origin of recent regional ice-mass loss in Greenland. - Earth and Planetary Science Letters, 333-334, 293-303.
https://doi.org/10.1016/j.epsl.2012.03.033

Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_244855

Zusammenfassung

Within the last decade, the Greenland ice sheet (GrIS) and its surroundings have experienced record high surface temperatures ( [Mote, 2007] and [Box et al., 2010]), ice sheet melt extent (Fettweis et al., 2011) and record-low summer sea-ice extent (Nghiem et al., 2007). Using three independent data sets, we derive, for the first time, consistent ice-mass trends and temporal variations within seven major drainage basins from gravity fields from the Gravity Recovery and Climate Experiment (GRACE; Tapley et al., 2004), surface-ice velocities from Inteferometric Synthetic Aperture Radar (InSAR; Rignot and Kanagaratnam, 2006) together with output of the regional atmospheric climate modelling (RACMO2/GR; Ettema et al., 2009), and surface-elevation changes from the Ice, cloud and land elevation satellite (ICESat; Sørensen et al., 2011). We show that changing ice discharge (D), surface melting and subsequent run-off (M/R) and precipitation (P) all contribute, in a complex and regionally variable interplay, to the increasingly negative mass balance of the GrIS observed within the last decade. Interannual variability in P along the northwest and west coasts of the GrIS largely explains the apparent regional mass loss increase during 2002–2010, and obscures increasing M/R and D since the 1990s. In winter 2002/2003 and 2008/2009, accumulation anomalies in the east and southeast temporarily outweighed the losses by M/R and D that prevailed during 2003–2008, and after summer 2010. Overall, for all basins of the GrIS, the decadal variability of anomalies in P, M/R and D between 1958 and 2010 (w.r.t. 1961–1990) was significantly exceeded by the regional trends observed during the GRACE period (2002–2011).