TOGA型海-气耦合模式直接模拟的SST误差分析

本文对一个TOGA(热带太平洋和全球大气)型耦合环流模式直接耦合30 a(1980—2009年)的模拟结果进行分析,发现模拟的热带太平洋海表温度存在严重的"气候漂移"现象。通过对模式海表温度控制方程中加热和冷却项的分析,特别是对海表热通量和风应力的分析,指出了两者的误差在热带太平洋海表温度的"气候漂移"现象中扮演的角色。为了进一步证实分析的结果,通过4个敏感性试验分析热通量和风应力对热带太平洋海表温度分布的作用,特别是热通量对西太平洋暖池的形成,而风应力对东太平洋冷舌的形成均有重要的作用以及纬向风应力和经向风应力对冷舌形成的相对贡献。

SST error analysis on the direct simulation of TOGA model

By analyzing thirty years’ direct coupling results of a TOGA coupled model it is found that serious "climate drift" phenomenon exists in the model’s tropical SST.Based on analysis of heating and cooling terms in the model’s SST equations,specially through analysis of heat flux and wind stress,it is pointed out what roles both errors play in "climate drift" phenomenon.In order to check the analysis results,four sensitive experiments have been performed to clarify the effect of heat flux and wind stress on the tropical SST distribution,especially both relative effects for forming western tropical warm pool and eastern tropical cold tongue,as well as relative contribution of zonal and meridional wind stress.