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Evidence and analysis of 2012 Greenland records from spaceborne observations, a regional climate model and reanalysis data

Tedesco, M ; Fettweis, X ; Mote, T ; Wahr, J ; Alexander, P ; Box, J. E ; Wouters, B

The cryosphere, 2013-04, Vol.7 (2), p.615-630 [Periódico revisado por pares]

Katlenburg-Lindau: Copernicus GmbH

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  • Título:
    Evidence and analysis of 2012 Greenland records from spaceborne observations, a regional climate model and reanalysis data
  • Autor: Tedesco, M ; Fettweis, X ; Mote, T ; Wahr, J ; Alexander, P ; Box, J. E ; Wouters, B
  • Assuntos: Albedo ; Analysis ; Balancing ; Climate ; Climate models ; Earth sciences & physical geography ; Ice sheets ; Marine ; Melting ; North Atlantic oscillation ; Physical, chemical, mathematical & earth Sciences ; Physique, chimie, mathématiques & sciences de la terre ; Remote sensing ; Sciences de la terre & géographie physique ; Summer ; Surface temperature
  • É parte de: The cryosphere, 2013-04, Vol.7 (2), p.615-630
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    scopus-id:2-s2.0-84879528945
  • Descrição: 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 similar to 97% of the ice sheet) and melting lasted up to similar to 2 months longer than the 1979-2011 mean. Model results indicate that near surface temperature was similar to 3 standard deviations ( sigma ) above the 1958-2011 mean, while surface mass balance (SMB) was similar to 3 sigma below the mean and runoff was 3.9 sigma 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, 2 sigma 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.
  • Editor: Katlenburg-Lindau: Copernicus GmbH
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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