1000
800
Is Out DI.
a) Atmospheric CO₂
A1B
Atmospheric CO₂ (µatm)
600
400
A2
B1
B2
IS92
200
8.2
b) Global Ocean pH
8.1
8.0
7.9
7.8
7.7
160
c) Southern Ocean Saturation
120
Surface saturation state (%)
80
80
40
Aragonite Saturation
0
2000
2020
2040
2060
2080
2100
Year
Surface pH
describe what each data set represents