| The Pacific Decadal Oscillation (2137 words) |
 | PDO indices have been constructed by projecting the observed monthly patterns of North Pacific SST and SLP anomalies onto the characteristic SST and SLP patterns shown in Figures 1 and 2, respectively (Trenberth 1990, Trenberth and Hurrell 1994, Zhang et al. |
| Figure 4: (top) Characteristic warm-phase PDO October-March air temperature anomalies, in degrees C. This field is based on linear regressions between the gridded surface air temperature data and the SST-based PDO index, shown in the top panel of Figure 3, for the period 1900-1993. |
| This is true because of the PDO's strong tendency for multi-season and multi-year persistence. |
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