Abstract
Summary A formation of a cold air lake in a basin is studied with a mesometeorological model. A dynamic Boussinesq hydrostatic mesoscale numerical model is developed in a staggered orthogonal grid with a horizontal resolution of 1 km and with a varying vertical grid. The topography is presented in a block shape so that computation levels are horizontal. The mesometeorological model is tested in three idealized topography cases (a valley, a single mountain, a basin) and test results are discussed. In an alpine basin surrounded by mountains and plateaus the air is supposed to be stagnant at the beginning of the night. Due to differences in radiation cooling an inversion layer is formed in the basin and local wind circulation is studied by model simulations.
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