太平洋海表面温度季节内振荡特征

为了研究太平洋海表面温度季节内振荡的特征,利用NOAA(national oceanic and atmospheric ad-ministration)周平均SST资料,采用谐波方法重构了太平洋海表面温度季节内振荡信号,针对不同海域,用小波分析等方法,揭示了SST季节内振荡的空间、频谱、季节性和传播特征.结果表明:海表面温度季节内振荡在黑潮区、黑潮续流区和赤道东太平洋较活跃,在赤道东西太平洋有相对重要的地位;在北太平洋谱特征均为单峰结构,在赤道东西太平洋呈双峰结构.不同海域海表面温度季节内振荡的活跃期分别为:北太平洋夏秋季,赤道东太平洋春和秋季,热带西太平洋活跃期较分散;在北太平洋以缓慢东传为主,在赤道东太平洋以西传为主,在热带西太平洋无明显传播.

Character istics of Pacific sea surface temperatune intraseasonal oscillations

In order to further study the characterist ics of Pacific sea surface temperature( SST) int raseasonal o scil lat ion ( SST ISO) , the NOAA data w as used. T hr oug h harmonic analy sis and w av elet analy sis, the characterist ics in relatio n to spatial, temporal , spect rum and propagat ion SST ISO w ere revealed. T he result show s that the active domains of Pacific SST ISO are the Kuroshio domain, Kuro shio extension domain and equato rial eastern Pacif ic Ocean. In comparison w ith SST interannual variat io n, that of the SST ISO is more important in east and w est equatorial Pacif ic. The spect rum characterist ics o f SST ISO in north Pacif ic domain ar e sing let w hile in east and w est equatorial Pacific are double peak. T he major act ive periods are summer and autumn in no rth Pacific, spring to autumn in east Pacif ic, end of summer to beg ining of w inter in w est equatorial Pacif ic. SST ISO mainly pr opag ates eastward in north Pacif ic, and mainly pr opag ates w estw ar d in equatorial east Pacif ic, w hile in the domain of w est equatorial Pacif ic, there is no obvious pro pagat ion.