Optical Absorbance Ratio at 620nm (CO2ABS2)
pCO2 of seawater is measured using a colorimetric reaction by injecting a pH-dependent indicator solution into a sample of seawater and measuring the absorbance of that mixture at two wavelengths. The ratio of absorbance between those two wavelengths is then used to calculate pCO2. Optical Absorbance Ratio at 620nm refers to the ratio of absorbance of the seawater sample with and without the pH indicator solution at a wavelength of 620 nm.
Instrument Classes
The following instrument classes include this data product:
- pCO2 Water (PCO2W)
Typical Units
unitless
Sampling Regime
Water Column
Data Product Specification
Not Available