O2 saturation derived from concentration

Consider an RBRconcerto³ with an integrated RBRcoda³ T.ODO or Aanderaa Optode DO sensor. The dissolved oxygen sensor transfers both the foil temperature and the dissolved oxygen concentration (not compensated for salinity). The RBRconcerto³ calculates the concentration compensated for salinity first, then the air saturation (in %) via the following equation:

where

• Cc is the concentration in uMol/L, compensated for salinity,
• Patm is atmospheric pressure, and
• Pav is air vapour pressure.

Solubility is calculated via Gordon and Garcia as:

where S is the salinity in PSU and Ts is defined as:

with T being the water temperature in °C and:

Air vapour pressure (in dbar) is calculated as: