| 2011年初秋河南连阴雨期间大气环流 异常机制分析 |
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| 引用本文： | 朱玉周,廖荣伟.2011年初秋河南连阴雨期间大气环流 异常机制分析[J].气象与环境科学,2019,42(3):86-93. |
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| 作者姓名： | 朱玉周 廖荣伟 |
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| 作者单位： | 河南省气象服务中心,郑州,450003;国家气象信息中心,北京,100081 |
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| 基金项目： | 国家自然科学基金;河南省气象局重点项目 |
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| 摘 要： | 2011年初秋河南连阴雨期间大气环流异常机制分析
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| 关 键 词： | 连阴雨 阻塞形势 正压涡度 斜压涡度 E-P通量 |
Mechanism Analysis of the Atmospheric Circulation Anomaly During the Henan Continuous Rain in Early Fall 2011 |
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| Zhu Yuzhou,Liao Rongwei.Mechanism Analysis of the Atmospheric Circulation Anomaly During the Henan Continuous Rain in Early Fall 2011[J].Meteorological and Environmental Sciences,2019,42(3):86-93. |
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| Authors: | Zhu Yuzhou Liao Rongwei |
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| Abstract: | Using the daily precipitation data of 119 observation stations in Henan and NCEP/NCAR reanalysis data in September 2011, the characteristics of the continuous precipitation and atmospheric circulation were analyzed. The key region affecting the continuous rain of Henan was found using correlation analysis method. The mechanism of atmospheric circulation anomaly in key region during the continuous precipitation was studied of by barotropic and baroclinic atmospheric decomposition and E P flux diagnosis method from the angle of the interaction between the basic airflow and disturbed airflow. The evolution characteristics of barotropic vorticity and baroclinic vorticity shows that the formation and maintaining of the key region high pressure systems are caused by the transporting of the minus barotropic vorticity from high latitude, while baroclinic vorticity tends to suppress the development of the key region high pressure systems, but the minus barotropic vorticity of the basic flow plays the leading role, so the quasi barotropy of the general atmospheric circulation and the barotropic vorticity of the basic flow play an important role on the formation and maintaining of the eddy flow. Diagnosis of E P flux shows that during the continuous rain, the E P flux is convergence at 40120°E, the basic flow at central Siberia decelerates, and the circulation tends to be radial. During the weakening or intermission of the continuous rain, the E P flux is divergence, the basic flow accelerates, and the circulation tends to be zonal. |
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