Abstract
WINTEX Sodankyla site observations were used to study physical processes, and their parameterizations in numerical models, in a case study concerning a clear and very cold late winter night with strong shallow surface inversion and strong wind shear. Studies with 1D atmospheric models (including HIRLAM) showed that the quite sensitive simulation of the evolution of such a stable boundary layer benefits from 1) high vertical resolution, 2) accurate description of the current local surface and soil/snow properties, and 3) decent parameterizations of all the main processes (surface exchanges; soil/snow physics; turbulence; radiation; fog/cloud physics), not just one or two.
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