Figure 3. Time series of 100m and 200m temperature in a 6 (lat) x 12 (lon) degree box centered at 39N, 160E from subsurface temperature data archives. Interannual anomalies are calculated for the region and then spatially-averaged. Also shown is the smoothed Pacific Decadal Oscillation index (based on December-March wintertime SST data) beginning in 1954.