【摘要】 使用NCEP资料,利用波谱方法,分析了湖北省1954年12月26日至1955年1月18日和2008年1月11日至2月1日两次长持续低温雨雪天气过程的物理量波谱演变。结果发现:(1)40°N纬圈优势波由4波转2波且纬向动能高值区位于35°N时,有利于湖北省维持低温雨雪天气;(2)低温雨雪过程开始前,高纬和低纬分别有纬向动能高值区,过程结束前,35°N纬向扰动动能高值中心或北跳或南移;(3)低温雨雪过程开始前,30°—35°N的长波角动量先辐合,超长波角动量后辐合,过程开始后,35°—55°N负的超长波角动量转正。更多还原

【Abstract】 The NCEP data and spectrum method were used to analyze the physical spectral evolution of two Long-lasting cryogenic rain and snow weather processes in Hubei province.One was from December 26,1954 to January 18,1955,and another was from January 11 to February 1,2008.The results are the following: 1) when the prevailing wave of 40°N parallel changes from 4 to 2 and zonal perturbation-kinetic energy zone in the high latitude locates in 35°N,it is propitious to the maintenance of continuous cryogenic rain and snow process in Hubei province.2) Before the beginning of the process,there were extreme value bands of zonal perturbation kinetic energy both in the low and high latitude respectively.Before the end of the process,the extreme value band of zonal perturbation kinetic energy in 35°N latitude jumped northwardly or moved southwardly.3) Before the beginning of the process,the long wave angular momentum converged first,and the super-long wave angular momentum converged later between 30°—35°N.After the beginning of the process,the negative super-long wave became positive between 35°—55°N.更多还原