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| Titel |
Evidence and analysis of 2012 Greenland records from spaceborne observations, a regional climate model and reanalysis data |
| VerfasserIn |
M. Tedesco, X. Fettweis, T. Mote, J. Wahr, P. Alexander, J. E. Box, B. Wouters |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 7, no. 2 ; Nr. 7, no. 2 (2013-04-04), S.615-630 |
| Datensatznummer |
250017954
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| Publikation (Nr.) |
 copernicus.org/tc-7-615-2013.pdf |
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| Zusammenfassung |
| A combined analysis of remote sensing observations, regional climate model
(RCM) outputs and reanalysis data over the Greenland ice sheet provides
evidence that multiple records were set during summer 2012. Melt extent was
the largest in the satellite era (extending up to ∼97% of the ice
sheet) and melting lasted up to ∼2 months longer than the 1979–2011
mean. Model results indicate that near surface temperature was ∼3
standard deviations (σ) above the 1958–2011 mean, while surface mass
balance (SMB) was ∼3σ below the mean and runoff was 3.9σ
above the mean over the same period. Albedo, exposure of bare ice and surface
mass balance also set new records, as did the total mass balance with summer
and annual mass changes of, respectively, −627 Gt and −574 Gt,
2σ below the 2003–2012 mean. We identify persistent anticyclonic
conditions over Greenland associated with anomalies in the North Atlantic
Oscillation (NAO), changes in surface conditions (e.g., albedo, surface
temperature) and preconditioning of surface properties from recent extreme
melting as major driving mechanisms for the 2012 records. Less positive if
not increasingly negative SMB will likely occur should these characteristics
persist. |
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