Dissolved Oxygen Saturation Calculator (Marine)
Estimate dissolved oxygen saturation in seawater from temperature and salinity using a simplified Benson–Krause approximation at sea level.
How to Use the Dissolved Oxygen Saturation Calculator (Marine)
- Enter water temperature in °C.
- Enter salinity in ppt (PSU).
- Click Calculate to see DO saturation.
Anwendungsfälle
- •Aquarium and aquaculture monitoring.
- •Marine biology field work.
- •Water-quality teaching.
Formel
DO_sat (mg/L) ≈ 14.6 − 0.4·T + 0.0045·T² at 0 PSU, sea level. Salinity correction: subtract 0.2 × salinity/10 mg/L.
Häufig gestellte Fragen
Why does oxygen drop with temperature?
Gas solubility in water decreases with temperature — warmer water holds less O₂, which is why summer stratification triggers hypoxia in many estuaries.
Is this accurate for open ocean?
The Benson–Krause approximation is within ~5% of measured values at sea level. For precise work use the full polynomial with pressure correction.