Ocean Acidification

Yearly pH

Historical, predicted decrease, and projected yearly mean pH by ecoregion. Predicted declines are for 2050-2099 based on the RCP 8.5 scenario. Predictions are based on the CMIP5 climate models downloaded from the NOAA Climate Web Portal.

No. Ecoregion Historical pH Predicted pH Decline Projected pH
1 Beaufort Sea - continental coast and shelf 8.2 -1.0 7.2
2 Chukchi Sea 8.11 -0.33 7.78
3 Eastern Bering Sea 8.11 -0.3 7.81
4 Aleutian Islands 8.09 -0.28 7.81
5 Gulf of Alaska 8.11 -0.3 7.81
6 North American Pacific Fjordland 8.1 -0.3 7.8
7 Puget Trough/Georgia Basin
8 Oregon, Washington, Vancouver Coast and Shelf 8.11 -0.3 7.81
9 Northern California 8.1 -0.27 7.83
10 Southern California Bight 8.09 -0.27 7.82
11 Magdalena Transition 8.09 -0.26 7.83
12 Cortezian 8.11 -0.25 7.86
13 Mexican Tropical Pacific 8.08 -0.25 7.83

Summer pH

Historical, predicted decrease, and projected summer pH by ecoregion. Predicted declines are for 2050-2099 based on the RCP 8.5 scenario. Predictions are based on the CMIP5 climate models downloaded from the NOAA Climate Web Portal.

No. Ecoregion Historical pH Predicted pH Decline Projected pH
1 Beaufort Sea - continental coast and shelf 8.15 -0.38 7.77
2 Chukchi Sea 8.15 -0.36 7.79
3 Eastern Bering Sea 8.1 -0.3 7.8
4 Aleutian Islands 8.1 -0.28 7.82
5 Gulf of Alaska 8.09 -0.29 7.8
6 North American Pacific Fjordland 8.07 -0.28 7.79
7 Puget Trough/Georgia Basin
8 Oregon, Washington, Vancouver Coast and Shelf 8.08 -0.28 7.8
9 Northern California 8.07 -0.27 7.8
10 Southern California Bight 8.04 -0.26 7.78
11 Magdalena Transition 8.05 -0.25 7.8
12 Cortezian 8.07 -0.25 7.82
13 Mexican Tropical Pacific 8.06 -0.25 7.81

Winter pH

Historical, predicted decrease, and projected winter pH by ecoregion. Predicted declines are for 2050-2099 based on the RCP 8.5 scenario. Predictions are based on the CMIP5 climate models downloaded from the NOAA Climate Web Portal.

No. Ecoregion Historical pH Predicted pH Decline Projected pH
1 Beaufort Sea - continental coast and shelf 8.1 -0.33 7.77
2 Chukchi Sea 8.09 -0.31 7.78
3 Eastern Bering Sea 8.1 -0.3 7.8
4 Aleutian Islands 8.07 -0.28 7.79
5 Gulf of Alaska 8.11 -0.3 7.81
6 North American Pacific Fjordland 8.12 -0.31 7.81
7 Puget Trough/Georgia Basin
8 Oregon, Washington, Vancouver Coast and Shelf 8.13 -0.3 7.83
9 Northern California 8.13 -0.28 7.85
10 Southern California Bight 8.12 -0.27 7.85
11 Magdalena Transition 8.13 -0.26 7.87
12 Cortezian 8.15 -0.25 7.9
13 Mexican Tropical Pacific 8.1 -0.25 7.85

Aragonite Saturation

Historical, predicted decrease, and projected aragonite saturation state by ecoregion. Predicted declines are for 2050-2099 based on the RCP 8.5 scenario. Predictions are based on the CMIP5 climate models downloaded from the NOAA Climate Web Portal.

No. Ecoregion Historical Saturation Predicted Saturation Decline Projected Saturation
1 Beaufort Sea - continental coast and shelf 1.49 -0.84 0.65
2 Chukchi Sea 1.44 -0.77 0.67
3 Eastern Bering Sea 2.33 -0.88 1.45
4 Aleutian Islands 1.86 -0.85 1.01
5 Gulf of Alaska 1.97 -0.87 1.1
6 North American Pacific Fjordland 2.22 -1.0 1.22
7 Puget Trough/Georgia Basin 2.44 -1.02 1.42
8 Oregon, Washington, Vancouver Coast and Shelf 2.4 -1.03 1.37
9 Northern California 2.48 -1.11 1.37
10 Southern California Bight 2.63 -1.18 1.45
11 Magdalena Transition 2.56 -1.25 1.31
12 Cortezian 2.61 -1.22 1.39