Ocean Acidification Calculator
Calculate the impact of atmospheric CO2 on ocean pH, carbonate chemistry, and marine ecosystems.
Atmospheric CO2
Current level: ~420 ppm (2024)
Ocean Conditions
Projection Settings
50 years
pH Scale Reference
Preindustrial OceanpH 8.25
Current AveragepH 8.05-8.10
Coral Stress BeginspH 7.9
Critical for ShellfishpH 7.8
Calculated Ocean pH
8.03
0.22 units below preindustrial
Acidity Change
+67%
Increase in hydrogen ion concentration since preindustrial era
Note: pH is logarithmic. A change of 0.1 pH = 26% change in acidity.
Carbonate Chemistry
1.43
Aragonite Saturation
Coral threshold: 3.0
2.14
Calcite Saturation
Shellfish threshold: 2.5
50-Year Projection
1087
ppm CO2
6.96
Ocean pH
0.01
Aragonite
Timeline Projection
| Year | CO2 | pH | Aragonite |
|---|---|---|---|
| 2024 | 420 | 8.03 | 1.43 |
| 2034 | 553 | 7.81 | 0.53 |
| 2044 | 687 | 7.60 | 0.20 |
| 2054 | 820 | 7.39 | 0.07 |
| 2064 | 953 | 7.17 | 0.03 |
| 2074 | 1087 | 6.96 | 0.01 |
Regional Variation
Tropical Pacific
pH 8.08Ar 1.57
North Atlantic
pH 8.01Ar 1.35
Arctic Ocean
pH 7.93Ar 1.00
Southern Ocean
pH 7.95Ar 1.07
Mediterranean
pH 8.06Ar 1.50
Marine Life Impact
Impact Level: Low
- Coral reefs: At risk
- Shellfish: Impaired calcification
- Pteropods: Shell dissolution risk
Ocean CO2 Absorption
10.0 Gt
CO2 absorbed by oceans annually (~25% of emissions)