| 准地转Q矢量在河南省区域暴雨过程中的诊断应用 |
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| 引用本文： | 张霞,王咏青,李敏.准地转Q矢量在河南省区域暴雨过程中的诊断应用[J].河南气象,2007(1). |
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| 作者姓名： | 张霞 王咏青 李敏 |
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| 作者单位： | 南京信息工程大学，南京信息工程大学，中牟县气象局 江苏南京210044，郑州市气象局，河南郑州450005，江苏南京210044，河南中牟451450 |
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| 基金项目： | 国家自然科学基金项目(40405009)，江苏省科技厅社会发展项目(BS2005055)，山东省气象局科学研究基金课题资助 |
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| 摘 要： | 应用NCEP再分析资料及常规地面观测资料,对2005年7月21-24日河南省大暴雨过程中准地转Q矢量作了诊断分析,结果发现:在对流层低层850 hPa等压面上,Q矢量散度的负值区与暴雨落区有着较好的对应关系;Q矢量散度场在垂直方向上出现低层辐合、高层辐散配置时,利于暴雨的产生,暴雨区位于Q矢量辐合中心下方,降水的强弱与Q矢量的低层辐合及高层辐散强弱变化一致。Q矢量的y分量能较好地反映出锋生、锋消的作用,并能指示6-12 h后的暴雨落区。
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| 关 键 词： | 暴雨 Q矢量 锋生 诊断 |
A Diagnosis Quasi-geostrophic Q-vector Diagnosis of a Regional Heavy Rainfall in Henan Province |
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| ZHANG Xia,WANG Yong-qing,LI Min.A Diagnosis Quasi-geostrophic Q-vector Diagnosis of a Regional Heavy Rainfall in Henan Province[J].Meteorology Journal of Henan,2007(1). |
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| Authors: | ZHANG Xia WANG Yong-qing LI Min |
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| Institution: | ZHANG Xia1,2,WANG Yong-qing1,LI Min3 |
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| Abstract: | By using NCEP reanalysis data and some routine observation data,the quasi-geostrophic Q-vector of the regional heavy rainfall process in Henan province from 21 to 24 July 2005 was diagnosed.The results indicated that the negative area of the divergence field of the Q-vector was correlated well to the heavy rainfall regions at the 850hPa.It was easier for the heavy rainfall occurrence when the divergence field of the Q-vector appeared convergence at the low level and divergence at the high level on its vertical direction.The heavy rainfall regions were located under the convergence center of the Q-vector.The precipitation intensity coincided with the strength of convergence at the low level and divergence at the high level.The Q-vector y component reflected well the function of frontogenesis and frontolysis,and it indicated the location of the heavy rainfall from 6 to 12 hours in the future. |
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| Keywords: | Heavy rainfall Q-vector Frontogenesis Diagnosis |
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