deri_o2sat_garcia - derivation of O2 saturation from concentration

When an instrument is connected to an RBRcoda³ T.ODO. The RBRcoda³ T.ODO transfers both the foil temperature and the dissolved oxygen concentration (not compensated for salinity). The instrument calculates the concentration compensated for salinity first, then the air saturation (in %) via the following equation:

where

• Cc is the concentration in μMol/L, compensated for salinity.

• Patm is atmospheric pressure.

• 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

The corresponding logger coefficients are:

• n0, the label of the concentration channel, already compensated for salinity.

• n1, the label of the water temperature channel.

• n2, the label of the salinity channel.

• n3, the label of the atmospheric pressure channel (set to value in order to use parameters atmosphere).
  Examples

>> calibration oxygensaturation_00
<< calibration oxygensaturation_00 datetime=20171201000000 offset=0.0000000e+000 slope=1.0000000e+000 n0=oxygenconcentration_00 n1=temperature_00 n2=salinity_00 n3=value

Request confirmation of all channel indices.