Dissolved Oxygen Saturation Altitude Temp Calculator
Approximate pure-freshwater oxygen saturation using bounded temperature cubic and dry-air station-pressure ratio; caller supplies actual pressure already altitude-resolved, not geodesy, exact standard solubility, salinity correction or observed deficit.
Description
Freshwater oxygen saturation depends on temperature and air pressure.
Freshwater oxygen saturation depends on temperature and air pressure. Station pressure already incorporates the caller’s altitude conditions.1
Enter temperature0–30°C and positive station pressure≤110 kPa above modeled vapor pressure. Compute vapor=0.61078exp(17.2694T/(T+237.29)); return approximate saturation and vapor pressure.
When to use Dissolved Oxygen Saturation Altitude Temp Calculator
Use Dissolved Oxygen Saturation Altitude Temp Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. This bounded cubic is not an exact solubility standard, salinity correction, altitude conversion or observed oxygen deficit.
Prepare the observed lake or sample measurements and explicit calibration, reference values or thresholds requested. Keep depth coverage, units, dates and sampling conditions consistent.
How to use Dissolved Oxygen Saturation Altitude Temp Calculator and understand its results
- Prepare the observed lake or sample measurements and explicit calibration, reference values or thresholds requested. Keep depth coverage, units, dates and sampling conditions consistent.
- Enter waterTemperatureC, measuredStationPressureKpa using the field table and calculation rules, then run the tool.
- Read approxFreshwaterOxygenSaturationMgLiter, approxWaterVaporPressureKpa. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| waterTemperatureC | Water temperature c | number | Required |
| measuredStationPressureKpa | Measured station pressure kpa | number | Required |
Enter temperature0–30°C and positive station pressure≤110 kPa above modeled vapor pressure. Compute vapor=0.61078exp(17.2694T/(T+237.29)); return approximate saturation and vapor pressure.
standard=14.621−0.41022T+0.007991T²−0.000077774T³; saturation=standard(P−vapor)/(101.325−vapor) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| approxFreshwaterOxygenSaturationMgLiter | Approx freshwater oxygen saturation mg liter | number |
| approxWaterVaporPressureKpa | Approx water vapor pressure kpa | number |
{
"input": {
"waterTemperatureC": 20,
"measuredStationPressureKpa": 90
},
"output": {
"approxFreshwaterOxygenSaturationMgLiter": 7.962176720345409,
"approxWaterVaporPressureKpa": 2.3382176476385186
}
}Limitations and assumptions
This bounded cubic is not an exact solubility standard, salinity correction, altitude conversion or observed oxygen deficit.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Reaeration Coefficient Oxygen Transfer Calculator: Constant first-order reaeration approaches a specified saturation concentration exponentially. Supersaturated water can yield signed oxygen loss. For a complementary task, use Hypolimnetic Oxygen Demand Rate Calculator: Oxygen demand can be inferred from inventory change after subtracting independently measured advection. A negative result indicates net nonadvective replenishment.
References
Similar or alternative tools
- Reaeration Coefficient Oxygen Transfer Calculator
Constant first-order reaeration approaches a specified saturation concentration exponentially. Supersaturated water can yield signed oxygen loss.
- Hypolimnetic Oxygen Demand Rate Calculator
Oxygen demand can be inferred from inventory change after subtracting independently measured advection. A negative result indicates net nonadvective replenishment.