作　　者： ; ; ; ; ; ;

机构地区： 中山大学环境科学与工程学院大气科学系

出　　处： 《热带地理》 2003年第1期35-39,共5页

摘　　要： 利用45年西太平洋副热带高压5个特征指数的月平均资料,对副高强度和位置变化的气候特征进行了诊断研究。结果表明,副高的强度在一年中出现两次峰值,第一次出现在6月,第二次在9月。在45年里,副高强度有明显加强,副高位置有南落西移的趋势。副高强度存在3～4年、10～13年的振荡周期,10～13年的周期振荡在1950、1960、1970年代占主要地位,3～4年的周期振荡在1980、1990年代占主要地位。副高在1978年附近发生气候突变,副高强度由负距平为主转为正距平为主,而脊线位置正好相反。 By using the monthly mean data from the National Climate Center of China for the 45 years (1954～1998), the climatic characteristics of the intensity and position of the subtropical high in the Western Pacific (for short SHWP) at 500hPa is diagnosed and studied. The conclusions are as follows. The seasonal variation of the intensity of SHWP has two peak values. The first is in June, and the second in September. Obviously SHWP has a trend of strengthening and moving westward and southward during the 45 years. The period intensity index of SHWP exhibits oscillation periods of 3～4 years and 10～13 years. The oscillations period of 10～13 years occurred mainly in 1950s, 1960s and 1970s, while the period of 3～4 years mainly in 1980s and 1990s. After 1978, the interdecadal variation of SHWP showed that the departures for strength index started to move from being mainly negative to positive. But the ridge position index had a contrary situation. 

关 键 词： 西太平洋副热带高压 位置变化 气候特征 气候突变 振荡周期 年代际变化

领　　域： [天文地球] [天文地球]