一次典型梅雨锋暴雨过程的多尺度结构特征
DOI:
作者:
作者单位:

作者简介:

通讯作者:

基金项目:

中国气象局 武汉暴雨研究所,湖北 武汉 430074


Multiscale structure features of a typical Meiyu frontal rainstorm process
Author:
Affiliation:

Fund Project:

Institute of Heavy Rain,China Meteorological Administration,Wuhan 430074,China

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    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。

    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.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
历史
  • 收稿日期:2010-04-08
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期:

地址:江苏南京,宁六路219号,南京信息工程大学    邮编:210044

联系电话:025-58731158    E-mail:xbbjb@nuist.edu.cn    QQ交流群号:344646895

大气科学学报 ® 2020 版权所有  技术支持:北京勤云科技发展有限公司