When sea ice forms in the ocean, the salinity of the surrounding ocean water decreases increases remains the same .

When sea ice forms in ocean salinity of surrounding ocean water increases. The salt plays an very important role in the ocean circulation.When sea ice is formed in an ocean then this indicates the insertion of salt into the ocean .The salinity of surrounding water increases as salt water is heavier i.e its density is more as a result of high density the water sinks.There is an exchange of salt takes place between ocean and the sea ice.This influences the ocean circulation and this circulation lasts upto several hundreds of kilometers.

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this is a good question! i'll do some research and come back when i have the answer!