|
In geophysical fluid dynamics, the f-plane approximation is an approximation where the Coriolis parameter, denoted ''f'', is set to a constant value. This approximation is frequently used for the analysis of highly idealized tropical cyclones. Using a constant Coriolis parameter prevents the formation of beta gyres which are largely responsible for the North-westward direction of most tropical cyclones. Rossby waves also depend on variations in ''f'', and do not occur in the f-plane approximation. In reality, the Coriolis parameter varies with latitude, and so the f-plane approximation is not appropriate when considering flows over large lengthscales. The f-plane approximation is also poor near the equator, where variations in ''f'' are on the same order of magnitude as ''f''. The beta plane approximation is an improvement on the f-plane approximation which takes leading-order variations in ''f'' into account. ==References== * * Isaac Held: (Rotating radiative-convective equilibrium ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「F-plane」の詳細全文を読む スポンサード リンク
|