海平面下降对日本海表层环流的影响

The influence of sea level variability on the surface circulation in the Japan Sea

本文基于POM海洋模式,通过改变地形条件进行了不同海平面下的数值实验,探讨了日本海表层环流场对海平面变化的响应。研究表明:随着海平面的下降,日本海南部的对马暖流及其分支逐渐减弱,海平面降低至-90 m和-100 m时,对马暖流的东朝鲜暖流分支和日本近岸分支几乎消失;而日本海北部的寒流强度基本保持不变,仅寒流主轴位置逐渐向北移动。且海平面的下降使对马海峡流量逐渐减小,进而导致对马暖流的强度逐渐减弱,影响范围也不断缩小。研究结果对过去古海洋海平面变化过程中日本海表层环流的改变问题具有一定的参考和依据。

A three-dimensional hydrodynamics model in the Japan Sea was established by POM,changing the topography conditions and carrying out numerical experiments under different sea levels,to study the responses of surface circumfluence field of the Japan Sea as the sea level dropped.With the decrease of sea level,the TWC(Tsushima Warm Current) and its branches gradually weaken in southern Japan Sea.When the sea level drops to-90 m and-100 m,the East Korean Warm Current branch and Tsushima Current coastal branch almost disappear.While the intensity of the cold current in the northern part of the Japan Sea remains basically unchanged,the position of its principal axis moves northward.Moreover,the transport volume through the Tsushima Strait reduce gradually due to the decrease of the sea level,which leads to the weakening of the TWC and the shrinking of its influence scope.The results can be used as a reference for the change of surface circulation in the Japan Sea in the past.