| 梅雨期西太平洋副热带高压异常东退与东风带扰动关系的合成诊断分析 |
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| 引用本文： | 张琴,姚秀萍,寿绍文.梅雨期西太平洋副热带高压异常东退与东风带扰动关系的合成诊断分析[J].大气科学,2011,35(1):29-40. |
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| 作者姓名： | 张琴 姚秀萍 寿绍文 |
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| 作者单位： | 1.南京信息工程大学大气科学学院, 南京,210044 |
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| 基金项目： | 中国气象局武汉暴雨研究所2008年度暴雨研究开放重点基金项目 （编号： IHR2005K04）， 国家自然科学基金资助项目40875030、 40775033 |
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| 摘 要： | 利用NCEP/NCAR日平均再分析资料,对梅雨期热带对流层上空东风带扰动影响西太平洋副热带高压短期东退的过程进行了合成诊断分析.结果表明:梅雨期西太平洋副热带高压(简称西太副高)的短期东退与低纬热带地区上宅东风带扰动存在着密切的联系,本文给出了在西太副高异常东退前后东风带扰动的结构及其演变特征,揭示了东风带扰动所对应的...
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| 关 键 词： | 梅雨期 西太平洋副热带高压 东风带扰动 合成诊断 机制 |
The Composite Analysis of the Relationship between the Abnormal Retreat of the Subtropical Anticyclone over the Western Pacific Ocean and the Easterlies Vortex in Meiyu Period |
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| ZHANG Qin,YAO Xiuping and SHOU Shaowen.The Composite Analysis of the Relationship between the Abnormal Retreat of the Subtropical Anticyclone over the Western Pacific Ocean and the Easterlies Vortex in Meiyu Period[J].Chinese Journal of Atmospheric Sciences,2011,35(1):29-40. |
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| Authors: | ZHANG Qin YAO Xiuping and SHOU Shaowen |
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| Institution: | 1.Nanjing University of Information Science & Technology, Nanjing,2100442.Institute of Heavy Rain, China Meteorological Administration, Wuhan,430074;Public Weather Service Center, China Meteorological Administration, Beijing,100081 |
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| Abstract: | The process of the vortex in the easterlies (EV) affecting the short-term eastward retreat of subtropical anticyclone over the Western Pacific (WPSA) is analyzed by employing the NCEP/NCAR reanalysis data sets. The short-term eastward retreat of the WPSA is related to the EV in the upper troposphere in tropical regions. The structure and alteration of the EV before and after the eastward retreat of the WPSA are shown in this paper. The reduction of the positive vorticity and the enhancement of the north wind foreshow the withdrawal of the WPSA. The ascent motion of flow field in the west of the EV is strengthened. This may become one of the main mechanisms of the WPSA short-term eastward retreat. The diagnostic analyses of the complete vertical vorticity equation show that the WPSA retreated eastward abnormally when the two positive vorticity trend areas on the west side of the EV and on the east side of the vortex in the westerlies (WV) connected. The vorticity advection is the most important factor of the WPSA eastward retreat. The contribution to the vorticity trend from the ascent motion term was adverse to the vorticity advection term. Spatial non-uniform heating effect is opposite in the upper and lower troposphere. Therefore, the short-term eastward retreat of WPSA is influence by the EV, the mechanisms lie in dynamic effect and thermodynamic effect. |
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| Keywords: | Meiyu period subtropical anticyclone over the western Pacific easterlies vortex composite diagnosis mechanism |
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