Seawater Properties and Dissolved Gas Calculators

Online calculators are provided by Beaver Creek Analytical, LLC on an "as is" basis. Users assume all risk associated with its use, and Beaver Creek Analytical, LLC expressly disclaims any and all liability for errors, inaccuracies, or any expenses or damages resulting from the use of or reliance upon the information provided by this calculator.

SCIENTIFIC BOUNDARIES & LIMITATIONS

This calculator uses equilibrium formulas from academic literature that were intended for use with:

Atmosphere-like gas compositions
Barometric pressure near 1 atm
Temperature between 0 and 30°C
Salinity between 0 and 40 psu

Using input values that go beyond these ranges will generate extrapolations with increasing levels of uncertainty due to non-ideal effects. The calculator requires mindful use.

Seawater Properties and Dissolved Gas Calculator

Inputs

Conditions	Value	Unit
Temperature
Dissolved Salts
Hyd. Pressure		dbar
Latitude		DD *
Longitude		DD *

* Latitude contributes to a small gravitational term that affects depth conversions.
* Latitude and longitude contribute to a very small compositional term that affects Absolute Salinity.

Gas calculations are based on solubilities determined using marine air and are subject to uncertainties derived from the determination of their actual atmospheric concentration. Assumed atmospheric dry partial pressures are adapted from NOAA:

Nitrogen = 78.084 %

Oxygen = 20.946 %

Argon = 0.934 %

Carbon dioxide = 0.042* %

Neon = 18.182 ppmV

Helium = 5.24 ppmV

Methane = 1.92* ppmV

Krypton = 1.14 ppmV

Hydrogen = 0.55* ppmV

Carbon Monoxide = 0.10* ppmV

Xenon = 0.087 ppmV

*known to have considerable variability

Partial Pressure → Aqueous Concentration

Inputs

Conditions	Value	Unit
Temperature
Dissolved Salts
Atm. Pressure
Reporting Units

Balance Gas

System Type

Dry Gas Content	Value	Unit

Note: This calculator uses equilibrium formulas from academic literature that were intended for use with:

Atmosphere-like gas compositions
Barometric pressure near 1 atm
Temperature between 0 and 30°C
Salinity between 0 and 40 psu

Using input values that go beyond these ranges will generate extrapolations with increasing levels of uncertainty due to non-ideal effects. The calculator requires mindful use.

Aqueous Concentration → Partial Pressure

Inputs

Conditions	Value	Unit
Temperature
Dissolved Salts
Atm. Pressure
Reporting Units

Dry Gas Content	Value	Unit

Note: This calculator uses equilibrium formulas from academic literature that were intended for use with:

Atmosphere-like gas compositions
Barometric pressure near 1 atm
Temperature between 0 and 30°C
Salinity between 0 and 40 psu

Using input values that go beyond these ranges will generate extrapolations with increasing levels of uncertainty due to non-ideal effects. The calculator requires mindful use.