Water Water Everywhere!
Welcome to the Hydrosphere!
What is hydrosphere
How does the temperature and salinity of the ocean affect movements in the ocean?
Salinity, along with temperature, determines the density of seawater, and hence its
vertical flow patterns in thermohaline circulation.
Thermohaline is part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes.
In the Earth's polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink. Surface water is pulled in to replace the sinking water, which in turn eventually becomes cold and salty enough to sink. This initiates the deep-ocean currents driving the global conveyor belt