Investigating Climatic and Environmental Processes
PDO Index & Impact

From Mantua et. al, 1999.

The figure to the left is a graphical depiction of the “Inverse Production Regimes” of Hare et al. (1999). The bars represent an index of 30 salmon time series for the period 1925-1997.

Following are the regional definitions: 1 –Western Alaska, 2 – Central Alaska, 3 – Southeast Alaska, 4 – British Columbia, 5 – Washington, 6 – Oregon, 7 – California. Three climate indices were included in the analysis: Pacific Decadal Oscillation (PDO), Aleutian Low Pressure Index (AL) and the El Niño-Southern Oscillation (ENSO). The longest bar, Central Alaska (2) pink salmon, has a value of 0.855, and represents the correlation between that time series and the illustrated temporal component (score) from the Principal Component Analysis.

Note: North Pacific (NP) Index probably not identical to PDO. Positive values indicate warm phases of PDO, negative values the cool phases.

Return to Climate Science 100 Years