cold lake water causes
As water temperature rises, oxygen solubility decreases. On a cool summer night, a lakeâs temperature might be 60Â° F. At 100% air saturation, this lakeâs dissolved oxygen levels would be at 9.66 mg/L. When the sun rises and warms up the lake to 70Â° F, 100% air saturation should equate to 8.68 mg/L DO Â³.