丁一汇,沈新勇. 1998. 非纬向非平行基流中的对称不稳定[J]. 气象学报, 56(2):154-165, doi:10.11676/qxxb1998.015
非纬向非平行基流中的对称不稳定
SYMMETRIC INSTABILITIES OF NON-ZONAL AND NON-PARALLEL MEAN FLOWS
投稿时间:1996-09-25  修订日期:1997-01-09
DOI:10.11676/qxxb1998.015
中文关键词:  对称不稳定  非纬向基流  非平行基流
英文关键词:Seaice  Dynamic-ther modynamics  Numerical weather prediction  Bohai Sea
基金项目:国家自然科学基金49335061课题
作者单位
丁一汇 国家气候中心, 北京, 100081 
沈新勇 北京大学地球物理系, 北京, 100871 
摘要点击次数: 1797
全文下载次数: 2391
中文摘要:
      文中讨论了非纬向非平行基流中的对称不稳定,得到了新的非纬向基流下对称不稳定的判据条件。在存在横向切变时,无旋层结流体中扰动的不稳定条件为Ri<14sin2(β-α);而在有旋层结流体中,弱的横向切变在取一级近似时并不能改变对称不稳定的增长率,但扰动必定传播,传播方向是顺切变方向,波长越短,传播速度越快。
英文摘要:
      Symmetric instabilities of non-zonal and non-parallel mean flows are discussed in this paper by using of nonhydrostatic equilibrium mode on a f-plane in which so nic wave is filtered under anelastic assumption. The new condition of symmetric instability of non-zonal mean flows has been found. In consideration of the shear of mean flows across the band distur bance, the instability condition of non-rotation stratified fluidis Ri < 1/4 sin2 (β-α). The weak shear of mean flows across the band distur bance can't change the growthrate of symmetric instability in rotation stratified fluid under O(∈) appr oximation. The distur bance must propagate along down shear. The shor ter the waveleng this, the bigger the phase velocity is.
HTML   查看全文   查看/发表评论  下载PDF阅读器
分享按钮