How does temperature affect Dissolved Oxygen solubility?
Effect of temperature on Dissolved Oxygen solubility
The solubility of oxygen decreases as temperature increases. This means that warmer surface water requires less dissolved oxygen to reach 100% air saturation than does deeper, cooler water. For example, at sea level (1 atm or 760 mm Hg) and 4 deg C (39 deg F), 100% air-saturated water would hold 10.92 mg/L of dissolved oxygen. However, if the temperature were raised to room temperature, 21 deg C (70 deg F), there would only be 8.68 mg/L DO at 100% air saturation.