SBE 16 Dissolved Oxygen

Dissolved Oxygen and Oxygen Saturation are computed according to the algorithms provided in Application Note NO. 64 - SBE 43 Dissolved Oxygen Sensor. From the manual...

Sea-Bird uses a slightly modified version of the algorithm by Owens and Millar (1985) to convert SBE 43 oxygen sensor data to oxygen concentration. The Sea-Bird algorithm incorporates a term related to the offset voltage produced for zero oxygen current. In addition, a modification to the Boc term is required, because the SBE 43 output is temperature compensated by exp(-0.03T) [i.e. tcor = -0.03]. Sea-Bird's algorithm has the following form:

OX = [Soc * {(v + offset) + (tau*doc/dt)} + Boc*exp(-0.03t)] * exp(Tcor*t + Pcor*p) * OXSAT(t,s)

Sea-Bird recommends that tau be set to zero.

1. sbe16_volts: this is unfortunately a misnomer. It is actually temperature compensated oxygen current in units of microamps. It got named sbe16_volts 'cause I'm freakin' lazy.

   temperature: ° C

2. oxygen_saturation: units of ml/l, implicitly requires temperature and salinity.

3. pressure: units of decibars. Computed from the sensor depth.

4. slope of oxygen current (microamps/sec): since tau is set to zero, this parameter is moot.

sbe16p_dissolved_oxygen.m: A MATLAB implementation can be found in the appendix.

dissolved_oxygen: units of ml/l