Fig.7.　The first EOF for the cold-season SST from 1950-1995 (contours) and grids that have continuouly available data from 1920 to 1995.

　

Fig.8.　(Top panel) 10-30 year filtered cold-season (Nov.-May) SST time series averaged over 46°-50°N, 170°-140°W (thick black curve, denoted as the border), 26-50°N, 130-110°W (thin dotted curv, denoted as the horseshoe), and 26-34N, 170E-160W (thin dashed curve, denoted as oval). (Bottom) 10-30 year filtered oval minus horseshoe SST (black curve) and NPI (dashed curve). The left axes are for the SSTs, and the right axis of the bottom panel for the SLP, i.e., NPI.

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