Additional processes influence oxygen in deep waters and you will explore the relationship between oxygen and nutrient chemistry. All gases dissolve somewhat in water. Bubbles do not form in the water unless the temperature and pressure change. The amount of gas that dissolves is a function of the temperature, pressure and salinity of the water. Less gas dissolves as temperature or salinity increases.
Gas is more soluble with increasing pressure.
The quantity of gas that dissolves in water at a given temperature, pressure and salinity is the saturation value . Since gas enters seawater at the ocean's surface, saturation values depend on the temperature and salinity of the water at one atmosphere of pressure. However some gases, such as oxygen, can be produced or consumed within the ocean, and this complicates their chemical cycles. Oxygen is one of the major dissolved gases in seawater and it is necessary for the respiration of marine animals and aerobic bacteria. Respiration consumes oxygen and produces carbon dioxide.