Not exact matches
Warm and
saline water transported poleward cools at the surface when it reaches high latitudes and becomes
denser and subsequently sinks into the deep ocean.
As the Atlantic Ocean's
water gets fresher from the melting ice caps, the warm,
saline, and more
dense Gulf Stream sinks further south, taking the warmer
water with to the bottom of the ocean.
As temperatures cool dramatically in the winter, ice forms and intense vertical convection allows the
water to become
dense enough to sink below the warm
saline water below.
When the sun heats our tropical oceans, evaporation causes that heated
water to become more
saline and
denser.
Surface
water tends to be less
saline and colder
water of low salinity is less
dense and so rises potentially reversing the «normal» situation.
Cold
water sinks readily in polar regions, as the surface
water tends to be closer to freezing, as well as being fresher from ice melt, and therefore less
dense than the inflowing currents, which are in turn are rendered more
saline by the fresh
water freezing out.