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Analysis of the energy balance terms obtained during the measuring campaign in 1991 at Greenland. It deals with profile and turbulence measurements, RASS-SODAR observations and radiation measurments.
The aim of the project is to obtain more insight in the response of the Greenland ice sheet to climatic change. For this purpose we will link our surface energy-balance model to an atmospheric model, so that the model can be forced by variables characterizing the atmosphere outside the thermal influence of the ice sheet itself. The modelling is supported by the mass-balance and meteorological data that we collect along a transect in West Greenland (the Kangerlussuaq-transect or K-transect). The albedo of the ice sheet is studied by means of satellite data and measurements obtained from a helicopter. Research activities - develop numerical models of the surface energy balance and the boundary layer above the ice sheet - perform annual measurements of the mass balance and ice velocity along the K-transect - maintain two automatic weather stations along the K-transect - study the surface albedo by means of remote-sensing images - improve methods to retrieve the surface albedo from satellite data by means of measurements obtained from a helicopter
Land ice forms an important component of the climate system. Sea level variations are closely related to the total ice volume. However, the relation between glacier mass balance and meteorological conditions is inderstood only broadly. In particular, the strong variation of mass balance patterns on the 10-300 km scale has hardly been investigated. Reduction of the uncertainty in estimating changes in glacier mass balance for climate change scenario's requires a better knowledge of the processes that lead to the spatial variability of glacier mass balance. The goal of the project is to indentify and model the most important factors leading to mesoscale variability of the mass balance field on ice caps.