摘要
利用ＴＯＧＡ—ＴＡＯ赤道次表层海流与海温观测资料，比较清楚地揭示了１９９７／１９９８年Ｅｌ Ｎｉｎｏ期间在赤道西太平洋暖池上空西风异常的驱动下，次表层异常海流的产生机制和向东传播过程中的变化特征。对比分析了海表、次表层异常海流的两种热力平流过程，即水平温度平流和因海流水平辐合辐散造成的垂直上翻（或下沉）运动对混合层及海表温度异常的贡献，结果证实了后一效应对ＥＮＳＯ发生发展的重要意义。最后还对文中的海流异常是否就是理论分析得到的Ｋｅｌｖｉｎ波在海流场上的反映进行了讨论。
In terms of TOGATA- subsurface currents and temperature dataset, observational evi-dences are presented to disclose the formation mechanism and eastward propagation features of subsurface current anomalies driven by the strong westerly wind anomalies over warm poo1 in the west-ern Pacific Ocean during the period of 1997 / 1998 El Nub / La Nina event. Further comparisons sug-gest that the dominant factor leading to the equatorial sea temperature anomaly within the mixed layer of Pacific is the anomalous upwelling caused by the convergence of subsurface currents rather than the horizontal thermal advections of surface currents. Finally, the possibility has been discussed about the assumption that the revealed current anomaly is just the reflection of Kelvin wave obtained in theory.
出处
《大气科学》
CSCD
北大核心
2002年第1期127-141,共15页
Chinese Journal of Atmospheric Sciences
基金
"九五"重中之重项目"我国短期气候预测系统的研究"96-908-02-05专题
APN99012
APN200012共同资助
