夏季北太平洋副热带高压年际变化的特征时间尺度及其时空演变  

Characteristic timescales and temporal-spatial changes of the subtropical high over the northern pacific in summer

作　　者：尤卫红[1] 赵付竹[1] 

机构地区：[1]云南大学资源环境与地球科学学院,云南昆明650091

出　　处：《云南大学学报（自然科学版）》2007年第1期40-48,共9页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(40575046);国家重点基础研究发展计划(973计划)资助项目(2003CB415100);云南省自然科学基金资助项目(2004D0005M)

摘　　要：应用三维数据的时间小波变换方法分析研究了夏季北太平洋副热带高压年际变化的特征时间尺度及其时空演变.结论为:夏季北太平洋副热带高压年际变化的特征时间尺度分别约为2,5 a和更大的时间尺度;2 a和5 a特征时间尺度的最大振幅能量活动中心分别位于北太平洋西部的(27.5°N,135°E)附近和北部的(35°N,167.5°E)附近;其相应的最大振幅能量活动中心在纬向上表现出了明显的东西向波动的时间演变特征;在经向上则表现出了明显的阶段性和较小振幅的南北向波动的时间演变特征;从较长时间的长期演变来看,5a特征时间尺度的最大振幅能量活动中心的位置有一种向南移动的趋势.Using the temporal wavelet transform method for three-dimensional data, the characteristic timescales and temporal-spatial changes of interannual variability of the subtropical high over the northern Pacific in summer are investigated. The results show that there are 2-year, 5-year and larger characteristic timescales for interannual variability of the subtropical high. The largest amplitude energy centers corresponding to the 2-year and 5-year characteristic timescales are located at the（27.5°N, 135°E）and（35°N, 167.5°E） respectively. The longitudinal evolutions of the largest centers in association with the characteristic timescales appear obviously longitudinal oscillatiorus. The latitudinal evolutiorus of the largest centers in association with the characteristic timescales appear obviously periodicity and the smaller amplitude latitudinal oscillations. In the longer time changes, the location of the largest amplitude energy center corresponding to the 5-year characteristic timescale has a tendency to move towards the south.

关 键 词：副热带高压 特征时间尺度 时空演变 小波变换 

分 类 号：P424[天文地球—大气科学及气象学]