Abstract
A two-dimensional hydrostatic meso-γ-scale model was used to study possible effects of a step change in roughness on the daytime sea breeze. Idealised numerical simulations with the length of aerodynamical roughness (z 0 ) ranging from 0.05 m to 1.0 m and by an increase of 0.05 m in all land grid points were made. Two z 0 effects could be pointed out: an increase in the mixing process and a reduction in the wind speeds in the surface layer. An increase of both heights and magnitudes of the sea breeze circulation, caused by a vertical extension of the turbulent field, followed a faster inland penetration of the sea breeze. The second effect resulting from a successive increase in z 0 values was a retardation of the sea breeze front near the ground, visible in its slope. This effect allowed the already faster inland penetration of the marine air high above the land.
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