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| 2003年淮河流域异常降水期间副热带高压的特征 |
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姚秀萍1,2, 于玉斌1, 刘还珠3
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1.中国气象局培训中心, 北京, 100081;2.中国科学院大气物理研究所, LASG, 北京, 100029;3.国家气象中心, 北京, 100081
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| 摘要: |
| 采用NCEP资料以及NOAA卫星观测的OLR场资料, 分析了2003年6～7月淮河流域暴雨期间西太平洋副热带高压的异常特征, 结果表明西太副高相对偏北并且相对稳定;西太副高活动呈现出南北移动和东西进退的特征, 但是东西进退明显于南北移动;副高脊线从低层到高层向北倾斜, 并且在副高脊线附近的低层以下沉运动为主, 在其上层以上升运动为主;中高纬度阻塞高压双阻型的建立、强劲而稳定少动的中纬度西风急流以及热带异常活跃的对流, 均有利于副热带高压的相对稳定;淮河流域异常的持续降水, 加强了对流潜热的释放, 有利于副高的加强西伸。 |
| 关键词: 西太副高 OLR 西风急流 热带对流 潜热 |
| DOI： |
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| 基金项目:自然科学基金项目40135020号;自然科学基金项目40205008号共同资助 |
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| CHARACTERISTICS OF THE SUBTROPICAL ANTICYCLONE DURING THE ABNORMAL RAINFALL PERIOD OVER THE HUAIHE RIVER REGION 2003 |
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YAO Xiu-ping1,2, YU Yu-bin1, LIU Huan-zhu3
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1.China Meteorological Administration Training Center, Beijing 100081, China;2.LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;3.National Meteorological Center, Beijing 100081, China
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| Abstract: |
| Using the NCEP data sets and the Outgoing Longwave Radiation (OLR) data sets, the analyses of the abnormal characteristics of the West Pacific Subtropical Anticyclone (WPSA) during the heavy rainfall period over the Huaihe basin region from June to July 2003 is made in this paper. It is shown that the WPSA is characterized by more northward than usual and relative stability. There exist shifts in the north-south direction and oscillations in the east-west direction for the movement of the WPSA, but the latter is more obvious than the former. The ridge of the WPSA inclines to the north from the lower troposphere to the higher troposphere, and there exists descending motion below the lower-mid troposphere and ascending motion above the mid–upper troposphere near the ridge of the WPSA. The establishment of a blocking anticyclone in the mid-higher latitude, the strong and the stable westerly jet in the middle latitude and the abnormal actively convective in the tropical region are conducive to the relative stability of the WPSA. Meanwhile, the continuous anomalous rainfall over the Huaihe R. basin region can also enhance the release of convective latent heating, which helps the development and westward movement of the WPSA. |
| Key words: SA OLR westerly jet convective latent heating |