Abstract
The explanation of winter land and sea breezes, which blow sometimes in the Sagami Plain is attempted. In the upper layer, the temperature is not affected by the surface temperature, and the pressure gradient is from the land to the sea. While, at night, the air is in contact with the cooled land surface and becomes denser than the air on the sea. lIn the lower layer, the pressure gradient develops from the sea to the land. This is seemed to be the cause of the winter land and sea breezes.
The quantitative explanation of this idea is undertaken based on a two-dimensional numerical model which simulates a circulation in a vertical plain perpendicular to the coast-line. It is shown that the diurnal variation of eddy temperature conductivity and eddy viscosity have a possibility to produce winter land and sea breezes.
