干旱气象

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浅析太平洋副热带高压的基本特征

纪凡华 1刘敏 1 王国清 2徐娟 1 , 韩风军 1   

  1. 1. 山东聊城市气象局, 山东 聊城 252000;
    2. 山东平度市气象局, 山东 青岛 266700
  • 出版日期:2014-05-17 发布日期:2014-05-17
  • 作者简介:纪凡华(1984 - ), 男, 汉族, 山东莒县人, 助理工程师, 主要从事天气预报工作. E - mail:jifanhua115@163. com

Basic Characteristics of the Pacific Subtropical High

JI Fanhua 1LIU Min 1WANG Guoqing 2XU Juan 1 , HAN Fengjun 1   

  1. 1. Liaocheng Meteorological Bureau of Shandong Province,Liaocheng 252000,China;
    2. Pingdu Meteorological Bureau of Shandong Province,Qingdao 266700,China
  • Online:2014-05-17 Published:2014-05-17

摘要:

利用 1958 ~2010 年 NCEP/NCAR 再分析位势资料以及 2 m 海表面温度资料, 研究太平洋副热带高压(以下简称太平洋 “副高” )的月、 季节变化特征, 分析系统的空间结构变化特征。研究结果表明:水平方向上太平洋 “副高” 系统存在中心、 脊线的南北位移和脊点的西伸或东撤, 其中心有逐月经向和纬向的变化, 6、 10 月是副高形态变异比较显著的时期;夏季副高最强, 冬季副高最弱;垂直方向上副高主要存在于 300 hPa 以下, 强度随高度逐渐减弱, 在近地面, 高压系统的位势高度梯度最大,达 40 gpm。

关键词: 太平洋副热带高压, 结构, 月变化, 季节变化

Abstract:

Monthly and seasonal variation,spatial structure,and inner sea surface temperature of the Pacific Subtropical High were studied by using reanalysis potential height data and two - meter sea surface temperature data during 1958 -2010 provided by NCEP/NCAR. Results show that in horizontal direction,the center and the ridge line of the Pacific Subtropical High had southern or northern moving and its ridge point had western or eastern shift,in addition,its center had monthly zonal and meridional variation,and its shape changed obviously in June and October,it was strongest in summer and weakest in winter. In vertical direction,the Subtropical High was mainly under 300 hPa level and its intensity decreased with height,and the geopotential height gradient was the biggest near the ground which reached 40 gpm. The sea surface temperature(SST) of the Subtropical High center in Northern Hemisphere had annual cycle with period of 2 -7 years,and in every cycle there was an abnormal change of SST,these changes had close links with occurence and developing of El Nino.

Key words: Pacific Subtropical High, structure, monthly variation, seasonal variation

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