一次典型梅雨锋暴雨过程的多尺度结构特征
投稿时间: 2010-04-08    点此下载全文
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作者单位
赵玉春,王叶红,崔春光  
基金项目:中国气象局 武汉暴雨研究所,湖北 武汉 430074
中文摘要:利用多种类型资料,对2009年6月29—30日引发鄂皖境内梅雨锋特大暴雨过程的天气形势和中尺度对流系统(MCSs)进行了初步分析,揭示了梅雨锋暴雨系统的多尺度结构特征,并用中尺度模式WRF对梅雨锋暴雨系统进行了9 km三重双向嵌套大区域精细模拟,再采用Morlet小波变换对模式输出进行空间带通滤波,分离出〖WTBX〗α、β和γ〖WTB1〗中尺度系统,对不同中尺度系统的热力动力三维空间结构特征进行了研究。结果表明:梅雨锋特大暴雨由梅雨锋上多个不同尺度的MCSs活动造成,这些不同尺度的MCSs在卫星云图和雷达回波上呈现出不同的特点。在〖WTBX〗α、β和γ〖WTB1〗中尺度上,梅雨锋暴雨中尺度系统在水平和垂直方向上的动力、热力结构特征存在着明显的差异,〖WTBX〗α、β中尺度系统具有明显的垂直环流,而γ中尺度系统则具有惯性重力波特征,往往嵌套在α、β〖WTB1〗中尺度系统内发生发展。最后,提出了典型梅雨锋暴雨系统的物理概念模型。
中文关键词:梅雨锋  暴雨  中尺度对流系统  多尺度结构特征  惯性重力波
 
Multi scale structure features of a typical Mei yu frontal rainstorm process
Abstract:Based on the multiple type observational data,this paper preliminarily analyses the meso scale convective systems(MCSs) and weather background producing an extremely heavy rain along the Mei yu front in Hubei and Anhui provinces during 29—30 June 2009,and investigates the multi scale structure features of the Mei yu frontal rainstorm system.Then the meso scale numerical model WRF with large domain and 9 km horizontal resolution is used to carry out a 3 domain nested fine simulation for the heavy rain process.Morlet wavelet transformation is carried out to do spatial band passing filter for the model outputs,and the meso 〖WTBX〗α, β〖WTB1〗 and 〖WTBX〗γ〖WTB1〗 scale systems are separated out,in such a way that the three dimensional spatial dynamic and thermodynamic characteristics of the meso scale systems with different scales are studied.The results are as follows.The extremely Mei yu frontal heavy rain is directly resulted from several MCSs with different scales,which are of different features on satellite cloud images and radar echoes.On meso 〖WTBX〗α, β〖WTB1〗 and 〖WTBX〗γ〖WTB1〗 scales,the Mei yu frontal heavy rain system has obvious different dynamic and thermodynamic structure features in horizontal and vertical directions.The meso 〖WTBX〗α〖WTB1〗 and 〖WTBX〗β〖WTB1〗 scale systems have obvious vertical circulation,while meso 〖WTBX〗γ〖WTB1〗 scale system has some features of inertial gravity waves and usually develops in meso 〖WTBX〗α〖WTB1〗 and 〖WTBX〗β〖WTB1〗 scale system.Lastly,a physic conceptual model is advanced for the typical Mei yu frontal rainstorm system.
keywords:Mei yu front  rainstorm  MCSs  multi scale structure features  inertial gravity wave
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