What is the relationship between the salinity and density of ocean water?

A decrease in salinity increases the density of seawater, altering the location of the halocline.

As salinity increases, the mass of the water increases as it holds more salt particles per unit volume, making it more dense.

An increase in salinity decreases the density of water above the halocline and increases the density of water below the halocline.

As salinity decreases, the water becomes more massive as it holds fewer salt particles per unit volume, making it less dense.