一个简单的热带海-气耦合系统中短期气候振荡的数值试验

用一个包括了湍流热交换、凝结、蒸发、辐射冷却、云量对辐射调节及海水上翻等各种物理过程在内的简单海-气耦合模式,进行了长期的数值积分。结果表明,热带海温异常通过热力过程影响大气的垂直环流,这种效应首先是局地的,以后这种影响会扩展到中纬度,而反过来,大气又对海洋产生动力影响,使海温发生变化。在只考虑上层海洋的情况下,试验表明在这一耦合系统中,存在着短期气候振荡,并且在赤道中太平洋和赤道东太平洋之间大尺度海表温度异常存在着落后相关。

NUMERICAL EXPERIMENT OF SHORT-TERM CLIMATIC OSILLATION IN A SIMPLE TROPICAL OCEAN-ATMOSPHERE COUPLED SYSTEM

A simple coupled ocean-atmosphere model is integrated numerically for long-range, in which we consider the turbulent heating, radiative cooling, regulation of radiative balance by clouds, condensation heating, evaporation from the sea and upwelling of ocean water. The results of the experiment show that the sea surface temperature anomalies in the tropical region may influence the atmospheric vertical circulation. These local effects in the low latitude may extend to the middle-high latitudes. Even though only upper ocean mixed layer has been considered, the short-term climatic oscillation and the SST lag relationships between the middle and eastern Pacific are revealed in this experiment.