IAP-14L热带太平洋环流模式中海温场的年际变率

INECHANISM VARIABILITY OF OCEANIC TEMPRETURE IN THE IAP-14L TROPICAL PACIFIC OGCM

本文利用1964M993年NCAR／NCEP再分析风应力强迫14层热带太平洋环流模式（OGCM），对热带太平洋海温场的年际变化进行了研究。茸先，我们对海温场的标准差进行分析，模式能较好地模拟海温场标准差水平和垂直分布的特征，特别是较好地反映了最大的变率不是发生在表层，而是次表层这一特征。然后，分析了与EL Nino事件关系密切的SSTA和SOTA的年际变化的特征，发现在EL Nino事件之前，西太平洋暖池的次表层海温都有明显正异常出现，它的东传导致了EL Nino的发生，并且SOTA的传播随纬度变化，沿赤道东传，在赤道外西传。最后，利用EOF分析了海温场的时空结构，模式海温场前两个特征向量的时间尺度类似ENSO周期以3～5a为主，其空间结构也是典型的EL Nino事件的前期和发生时期空间特征分布。

In this paper, by using of IAP-14L Tropical Pacific OGCM with NCAR/NCEP reanalysis wind stress data, we study the interannual variability of oceanic tempreture in the tropical Pacific from 1964 to 1993. First, we analyse standard deviation of oceanic temperature. Results disclose that simulation can well compare with observation. Secondly, we analyse relation of anomalies of subsurface sea temperature in the warm pool and anomalies of surface sea temperature in Nino3. Anomalies of subsurface sea temperature in the warm pool and their eastward propagation have very important and direct effects on the occurrence of El Nino and propagations of anomalies of subsurface sea temperature is different in different latitudes. Finally, Composite structure have been described with the use of EOF.