Question: The Mississippi River typically has its largest discharge into the Gulf during the spring. The fresh river water is less dense and floats over the Gulf salt water, as shown by the light blue water layer in the vertical cross-section starting at 2:43 min in the video. The resulting surface water layer ______ convection and the replenishment of dissolved oxygen in ocean water at greater depths. a. enhances b. inhibits c. does not change. Need Assignment Help?