Scroll down to related links and look at "Salinity of the oceans". http://en.wikipedia.org/wiki/Image:Wiki_plot_04.png
The salinity of the ocean was much higher than I thought it would be.
The top most layer has more salinity. But ignoring thermo-haline currents.
The salinity of sea waters is approx. 3,5 %.
The salinity of sea waters is approx. 3,5 %.
Hypersaline refers to a body of water that has about 40 parts per mil salinity which is much higher than the salinity for average ocean water which is about 35 parts per mil salinity.
Ocean water has a higher salinity (salt content) than fresh water does.
Deep ocean currents and surface currents do meet, but mixing is limited. The waters stratify based on temperatures and salinity. The higher the salinity, the heavier the water.
Salinity can vary because of water temperature, rivers emptying into the ocean and mixing with ocean water, ice forming or melting, evaporation and precipitation. I think temperature is the biggest reason.
because ocean water leaves salt behind when it freezes
Salinity is a measure of how salty water is. Ocean water is more salty in some places than in others. The answer is yes, places where rivers pour fresh water into the ocean have low salinity because fresh water is normally cold and in warm areas, ocean water evaporates quicker. When this happens, salt is left behind and the ocean water has a higher salinity.
The salinity of ocean water depends on its location, rate of evaporation, amount of precipitation and amount of freshwater added to the ocean.
Arctic ocean