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| Titel:
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Timing and origin of recent regional ice-mass loss in Greenland |
| Type:
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Journal articleJournal article |
| Person(er):
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Forfatter:
Sasgen, Ingo
Department of Geodesy and Remote Sensing, GFZ German Research Centre for Geosciences
Forfatter:
van den Broeke, Michiel
Institute for Marine and Atmospheric Research, Utrecht University
Forfatter:
Bamber, J.L.Jonathan L.
School of Geographical Sciences, University of Bristol
Forfatter:
Rignot, Eric
Jet Propulsion Laboratory
Technical University of Denmark
Email:
Forfatter:
Wouters, Bert
Royal Netherlands Meteorological Institute
Forfatter:
Martinec, Zdeněk
School of Theoretical Physics, Dublin Institute for Advanced Studies
Forfatter:
Velicogna, Isabella
Jet Propulsion Laboratory
Forfatter:
Simonsen, Sebastian
Danish Climate Centre
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| Uddrag:
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Within the last decade, the Greenland ice sheet (GrIS) and its surroundings have experienced record high surface temperatures (Mote, 2007; 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). |
| Publiceret:
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in journal: Earth and Planetary Science Letters (ISSN: 0012-821X) (DOI: http://dx.doi.org/10.1016/j.epsl.2012.03.033), vol: 333-334, pages: 293-303, 2012 |
| DOI:
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