简易海洋同化数据中的厄尔尼诺现象

为研究在厄尔尼诺现象演变过程中海气相互作用的性态特征,该文再次应用拓展伴随模态分析于简易海洋同化数据(SODA data).结果表明:通过相互作用形成厄尔尼诺/拉尼娜现象的海洋与大气具有明显不同的性态,气候系统中并不存在一个相对独立的热带太平洋大气变异,但是的确存在一个相对独立的热带太平洋海洋变异;原因在于大气是底部界面受热而海洋是顶部界面受热,从而导致前者具有较后者强烈得多的斜压不稳定性和能够覆盖大部分热带太平洋的赤道辐合带; 再次证实了正是直接来自中纬度海域的西风爆发和海面风辐聚导致赤道太平洋上层海水的东向移动和经向辐聚造就了厄尔尼诺所特有的增温信号.

El Niño phenomenon in SODA data

To study how the air and sea interact with each other during El Niño/La Niña onsets,extended associate pattern analysis(EAPA)is adopted with the simple ocean data assimilation(SODA)data.The results show that as El Niño/La Niña's parents their behaviors are quite different,there does not exist a relatively independent tropical atmosphere but does exista relatively independent tropical Pacific because the air is heated from bottom surface instead of top surface and of much stronger baroclinic instability than the sea and has a very large inter-tropical convergence zone covering the most tropical Pacific.The idea that it is the wes er burst and wind convergence,coming from middle latitudes directly which produce the sea-water east ward movement and meridional convergence in the upper levels and result in the typical El Niño sea surface temperature warm signal is confirmed again.