Down-Slope Windstorms on an f-Plane

[摘要] The effect of the earth's rotation on down-slope windstorms induced by a mountain range, which is uniform in the north-south direction, in an eastward uniform environmental flow with a constant buoyancy frequency is analytically investigated. The velocity field is assumed to be uniform in the north-south direction. After an appropriate non-dimensionalization, the non-dimensional Coriolis parameter f becomes small. To the O(f) approximation, the wind speed component in the east-west direction is not altered by the rotation, and the same down-slope windstorms occur as in the non-rotational case. On the other hand, the wind speed component in the north-south direction, which is everywhere uniform in the non-rotational case, is altered by the rotation. At the leeward foot of an east-west symmetric mountain profile, the southward wind component is increased by the rotation.

[学科分类] 大气科学