![]() ![]() (1997), is the dominant year-round pattern of monthly sea surface temperature (SST) anomalies in the North Pacific obtained via Empirical Orthogonal Function (EOF) analysis. The Pacific Decadal Oscillation (PDO), first defined by Mantua et al. Thus, relatively long data records are needed to define and understand the PDO. The largest distinction between the PDO and ENSO is their timescales: While ENSO is primarily an interannual phenomenon, the PDO is decadal in scale. Overall, the PDO's spatial pattern resembles that of ENSO. A weak mirror image of these anomalies occur across the South Pacific. ![]() The positive phase of the PDO is also associated with positive SST anomalies across the central and eastern tropical Pacific. ![]() ![]() Positive values of the PDO index correspond with negative SST anomalies in central and western North Pacific (extending eastwards from Japan), and positive SST anomalies in the eastern North Pacific (along the west coast of North America). The SST anomalies are obtained by removing both the climatological annual cycle and the global-mean SST anomaly from the data at each gridpoint. The Pacific Decadal Oscillation (PDO) is defined by the leading pattern (EOF) of sea surface temperature (SST) anomalies in the North Pacific basin (typically, polewards of 20°N). ![]()
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