When the warm water contacts cold Arctic air, it cools, becomes saltier and more dense and sinks to the ocean floor, returning south on the same path.

• 当温暖的海水遇到了冰冷的北极空气，它就冷却了，变得盐份更高、浓度更大，并下沉到海底，沿着同样的路径转向南方。