气象科技进展Issue(5)：6-11,6.DOI:10.3969/j.issn.2095-1973.2013.05.001
从牛顿力学认识罗斯贝波的振荡机理及其回复力
On the Oscillation Mechanism and Restoring Force for Rossby Waves
摘要
Abstract
The recent work of Cai and Huang[1] presents an entirely new view on the physical origin of Rossby waves:the presence of the latitudinal variation of the Coriolis parameter and/or a sloped bottom terrain serves as a mechanical barrier that causes a mass convergence (divergence) when a geostrophic lfow crosses it uphill (downhill). Part of the mass convergence (divergence) causes pressure rising (falling) along the uphill (downhill) pathway while the remaining part is detoured as an unbalanced lfow that crosses isobars. This mechanically excited unbalanced lfow is subject to a“half-cycle”Coriolis force that only turns it to the direction parallel to isobars without continuing to turn it further back to its opposite direction because of the balance nature of the lfow parallel to isobars. Such oscillation, involving a barrier-induced mass convergence, a mechanical delfection, and a half-cycle Coriolis delfection, is referred to as a mechanical-Coriolis oscillation with a“barrier-induced half-cycle Coriolis force”as its restoring force. Through a complete cycle of the mechanical-Coriolis oscillation, a new pattern of the geostrophic lfow, which is in balance with a new pressure pattern, emerges to the left of the existing lfow when facing the uphill (downhill) direction of the barrier in the Northern (Southern) Hemisphere. Due to the latitudinal variation of the Coriolis parameter, theβ-barrier is always sloped towards the pole in both hemispheres, responsible for the westward propagation of Rossby waves.关键词
罗斯贝波/科氏力/地转平衡/非平衡流Key words
Rossby waves/Coriolis Force/geostrophic balance/unbalanced geostrophic lfow引用本文复制引用
蔡鸣,虞越越..从牛顿力学认识罗斯贝波的振荡机理及其回复力[J].气象科技进展,2013,(5):6-11,6.基金项目
国家重点基础研究发展计划 （）
