What are the major controlling factors for the variations of the water mass in the ocean?

Rising and falling of tides, Winds and thermohaline circulation in oceans.

Explanation:

As oceanic mass is always defined as a body of water which has commonly formed with the chemical and physical properties. Like temperature salinity and common water mass in the world are Atlantic bottoms, Deepwater basins. Depth of the oceanic water can be measured through the salinity or dissolved salt content in water, this affects the amount of freshwater in oceans. Deeper zones of water bodies are found near the trenches and valley bottoms. Winds are responsible for raising and falling of tidal waters in oceans and movement of currents produced in water masses affects the direction and flow of water bodies. Winds have a direct impact on the ocean warm water upwelling and other factors being the flow of debris etc.