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Xavier Fettweis Hubert Gallée Filip Lefebre Jean-Pascal van Ypersele 《Climate Dynamics》2005,24(6):623-640
The 1990 and 1991 ablation seasons over Greenland are simulated with a coupled atmosphere-snow regional climate model with
a 25-km horizontal resolution. The simulated snow water content allows a direct comparison with the satellite-derived melt
signal. The model is forced with 6-hourly ERA-40 reanalysis at its boundaries. An evaluation of the simulated precipitation
and a comparison of the modelled melt zone and the surface albedo with remote sensing observations are presented. Both the
distribution and quantity of the simulated precipitation agree with observations from coastal weather stations, estimates
from other models and the ERA-40 reanalysis. There are overestimations along the steep eastern coast, which are most likely
due to the “topographic barrier effect”. The simulated extent and time evolution of the wet snow zone compare generally well
with satellite-derived data, except during rainfall events on the ice sheet and because of a bias in the passive microwave
retrieved melt signal. Although satellite-based surface albedo retrieval is only valid in the case of clear sky, the interpolation
and the correction of these data enable us to validate the simulated albedo on the scale of the whole Greenland. These two
comparisons highlight a large sensitivity of the remote sensing observations to weather conditions. Our high-resolution climate
model was used to improve the retrieval algorithms by taking more fully into account the atmosphere variability. Finally,
the good agreement of the simulated melting surface with the improved satellite signal allows a detailed estimation of the
melting volume from the simulation. 相似文献