Ocean salinity freshwater fraction calculator

Calculate fresh-endmember fraction and saline-endmember fraction with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use fresh-endmember fraction and saline-endmember fraction to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Measured salinity
30
Fresh endmember salinity
0
Saline endmember salinity
35
Fresh-endmember fraction
0.142857
Saline-endmember fraction
0.857143

Try another scenario

Measured salinity
33
Fresh endmember salinity
0
Saline endmember salinity
35
Fresh-endmember fraction
0.057143
Saline-endmember fraction
0.942857
Calculation method

Calculation method

Fresh-endmember fraction

(saline−measured)/(saline−fresh); reject values outside endmembers.

Saline-endmember fraction

(measured−fresh)/(saline−fresh).

Symbols and units
a
Measured salinity
b
Fresh endmember salinity
c
Saline endmember salinity

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Measured salinity, chosen endmembers. Returns Two-endmember mixing fractions. All coefficients and observations are user supplied; results describe only the stated mathematical model. Quantities are deterministic calculations from supplied observations and assumptions; no external data is fetched. Supported limits: Finite inputs only; numeric fields bounded as labelled. Lists and JSON records are limited to 256 entries unless a stricter tool bound is stated. No automatic design approval, legal conclusion, treatment recommendation or safety certification. Measured salinity: minimum 0, maximum 1000000000000.0. Fresh endmember salinity: minimum 0, maximum 1000000000000.0. Saline endmember salinity: minimum 1e-12, maximum 1000000000000.0.
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