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Carbon System Algorithm

We trained an empirical model to predict carbon system parameters from measured temperature, oxygen, salinity, pressure, and nitrate using data from P16S 2014 and S04P 2011 between 0 and 2100 m south of 45°S. We have applied these algorithms to floats in the Pacific Sector and evaluated the measured vs. the algorithm-predicted pH.

Carbon System AlgorithmCarbon System Algorithm

For example:

pHN = β0 + β1*S + β2*T + β3*P + β4*N

pHOx = β0 + β1*S + β2*T + β3*P + β4*O2 

 

Target Variable Predictor Variables R2 rmse
pHN
(pH units)
Salinity
Temperature
Pressure
Nitrate
0.981 0.010
pHOk
(pH units)
Salinity
Temperature
Pressure
Oxygen
0.964 0.008
DIC
(µmol/kg)
Salinity
Temperature
Oxygen
0.998 2.55
TA
(µmol/kg)
Salinity
Temperature
Oxygen
Sigma Theta
0.987 3.5
ΩAr
(no units)

Salinity
Temperature
Pressure
Oxygen
Sigma Theta

0.993 0.024