Het is van iemand van onze afdeling en zeer interessant. 'k Heb de bewijzen gezien en die zijn, vind ik, wel overtuigend. Hierbij geef 'k 't abstract. Als er mensen zouden zijn die 't volledige artikel willen, geef me een seintje.
Wouter
The 1988–2003 Greenland ice sheet melt extent using passive microwave satellite data and a regional climate model
Xavier Fettweis1 Contact Information, Hubert Gallée2, Filip Lefebre3 and Jean-Pascal van Ypersele1
(1) Institut d’Astronomie et de Géophysique de G. Lemaître, Université Catholique de Louvain, 2, chemin du cyclotron, 1348 Louvain-La-Neuve, Belgium
(2) Laboratoire de Glaciologie et Géophysique de l’Environnement, CNRS, Grenoble, France
(3) Vito-IMS (Flemish Institute for Technological Research-Integral Environmental Studies), Mol, Belgium
Received: 2 May 2005 Accepted: 31 March 2006 Published online: 13 May 2006
Abstract Measurements from ETH-Camp and JAR1 AWS (West Greenland) as well as coupled atmosphere-snow regional climate simulations have highlighted flaws in the cross-polarized gradient ratio (XPGR) technique used to identify melt from passive microwave satellite data. It was found that dense clouds (causing notably rainfall) on the ice sheet severely perturb the XPGR melt signal. Therefore, the original XPGR melt detection algorithm has been adapted to better incorporate atmospheric variability over the ice sheet and an updated melt trend for the 1988–2003 period has been calculated. Compared to the original algorithm, the melt zone area increase is eight times higher (from 0.2 to 1.7% year−1). The increase is higher with the improved XPGR technique because rainfall also increased during this period. It is correlated to higher atmospheric temperatures. Finally, the model shows that the total ice sheet runoff is directly proportional to the melt extent surface detected by satellites. These results are important for the understanding of the effect of Greenland melting on the stability of the thermohaline circulation.
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