The top most layer has more salinity.
But ignoring thermo-haline currents.
The salinity of the ocean was much higher than I thought it would be.
the most dense part of the water is in the pacific ocean. it is located near the middle of the ocean. go 50 miles past the middle and you there. Make sure you go north though. It's an ocean trench. HOPE THIS HELPS>>>>>EVEN THOUGH IS'T WRONG...
The lowest areas of salinity in an ocean are near where fresh water rivers empty into them. This is because the influx of fresh water creates an area of lower salinity compared to the remainder of the ocean.
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.
Water salinity describes the amount of salty minerals dissolved in a sample of water. It would therefore make no difference whether the water is warm or cold, since you would have the same amount of salt dissolved in the water per cm3 of water. Salinity would change if you added more water, or if the water was so hot that some of it evaporates, leaving all the dissolved solids behind, but decreasing the amount of water it is dissolved in.
The salinity of the ocean was much higher than I thought it would be.
Scroll down to related links and look at "Salinity of the oceans". http://en.wikipedia.org/wiki/Image:Wiki_plot_04.png
When ocean water freezes into sea ice, some of the salt is incorporated into the new ice. Thereafter, that salt drains as brine (salt plus water), causing the layer of water below to be of higher salinity.
Salinity vs. depth profiles are different in different parts of the ocean, so there is really no one correct answer to this question.
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.
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
You could increase the salinity of the ocean by adding salt or removing water (ie: by evaporation).