Question

what is the difference between salinity and density. 5. How does this relate to the deep currents of the ocean?

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Answer 1

I'm not gonna give you the answer but i will tell this to hopefully help you.

At a temperature of 4° C pure water reaches its maximum or peak density, cooled further it expands and becomes less dense than the surrounding water which is why when water freezes at 0° C it floats.

Salinity and density share a positive relationship. As density increases, the amount of salts in the water—also known as salinity, increases. Various events can contribute to change in the density of seawater.

Salinity can decrease from the melting of polar ice or increase from the freezing of polar ice. Evaporation increases salinity and density while the addition of freshwater decreases salinity and density.

The Mississippi deltaThe Mississippi delta

The ocean water is constantly churning underneath, bringing nutrients up to the top. The difference in density of cold water versus density of warmer water is responsible for ocean currents and upwelling. Warm seawater floats and cold (4° C), dense (1 g/cm3), seawater sinks, so ocean temperatures also vary across the surface and into the depths.

Ocean thermocline

Answer 2

Salinity is the concentration of salt dissolved in water while density is the ratio of mass over volume. In general, they are directly related - as salinity increases, the density of water increases as well. So in deep ocean, the dense water with higher salinity will sink below less dense water. The density difference will create flow between shallow and deep ocean water.