How does pressure affect Dissolved Oxygen solubility?

Document ID

Document ID TE2881

Version

Version 3.0

Status

Status Published

Published Date

Published Date 07/10/2018
Question
How does pressure affect Dissolved Oxygen solubility?
Summary
Effect of pressure on dissolved oxygen solubility
Answer
Dissolved oxygen will increase as pressure increases. This is true of both atmospheric and hydrostatic pressures. Water at lower altitudes can hold more dissolved oxygen than water at higher altitudes. This relationship also explains the potential for "supersaturation" of waters below the thermocline - at greater hydrostatic pressures, water can hold more dissolved oxygen without it escaping. Gas saturation decreases by 10% per meter increase in depth due to hydrostatic pressure. This means that if the concentration of dissolved oxygen is at 100% air saturation at the surface, it would only be at 70% air saturation three meters below the surface.

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