摘要
利用常规天气图和数值预报产品资料,采取天气学和波谱方法,分析了2009年2月13日至3月4日湖北持续雨雪过程的环流形势及能量谱特征,并与2008年1月10日至2月1日湖北罕见持续低温雨雪冰冻过程进行对比。结果表明:两次持续雨雪过程具有基本相同的长波系统背景场条件和地面冷空气影响路径;对流层850—700 hPa存在逆温层,后一过程的逆温层维持时间更长、强度更大且无中断;两次雨雪过程的温度分布和强度差异明显,后者气温异常偏低,冰冻现象严重;两次雨雪天气期间,中高纬、中低纬地区的能量谱强度、输送和转换变化明显,且与天气系统的变化相对应。
Based on the regular synoptic chart and numerical forecasting products,the circulation and energy spectrum characteristics of freezing-rain and snow weather in Hubei from February 13 to March 4, 2009 are studied by using the synoptic and spectral analysis methods comparing with those of the same weather from January 10 to February 1, 2008. It is found that both cases have the same system of long-wave background field and the impact of the same ground path of the cold air. There was obvious temperature inversion from 850 hPa to 700 hPa in both processes, and the latter one maintained longer, and had greater intensity without interruption. They had distinct differences at temperature distribution and intensity, the latter has exceptionally low temperatures and serious frozen. During the two courses, the energy spectral intensity, transmission and conversion changed between low and high latitudes were significant corresponding with the weather systems change.
出处
《暴雨灾害》
2009年第4期328-332,356,共6页
Torrential Rain and Disasters
基金
国家科技支撑项目"南方冰雪灾害天气预测预警评估技术研究"资助
关键词
持续雨雪
低温
环流形势
逆温层
扰动动能谱
角动量输送谱
Continuous freezing-rain and snow weather
Freezing temperature
Circulation
Temperature inversion
Kinetic energy spectra of disturbances
Angular momentum transfer spectrum
