High resolution numerical simulations of temporal and vertical variabilityin the stable wintertime boreal boundary layer: a case study

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