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Figure 1 Scatter plot of zonal mean SST anomalies in the Northern tropics (10-20°N: the horizontal axis) and Southern tropics (10-20°S: vertical axis)
Figure 2 The first EOFs for the North and the South Atlantic, which explain 44.2％ and 43.2％ of decadal SST anomalies (8-16 years). Positive (negative) values are represented by solid (dashed) lines. The upper two curves in the bottom panel present the principal component (PC) of the North (solid line) and South (dashed line) Atlantic EOFs. The lowermost curve presents the dipole index.
Figure 3 The simultaneous regression pattern of the Atlantic SST for the dipole index. Contour interval is 0.2℃. Positive (negative) values are represented by the solid (dashed) lines. Dark (light) shaded are the regions in which regressions are more than 0.4℃ (less than -0.4 ℃).
Figure 4 (a) The simultaneous regression patterns of SLP (left panel) and wind vector (right panel) fields based on the dipole index. Contour interval is 0.2 hPa for SLP fields. Positive (negative) values are represented by the solid (dashed) lines. The reference wind speed (1.6ms-1) are indicated on the bottom of panels. (b) five-year running mean dipole (solid line) and NAO indices (dashed line).
Figure 5 The two leading EOFs for the annual mean SST anomalies in the tropical (20°N-20°S) Atlantic (upper and middle panels). The percentage of variance explained on this time scale is indicated in the upper right corner at each panel.. Contour interval is 0.02. Positive (negative) values are represented by solid (dashed) lines. The bottom panel presents the principal component (PC) of the first (solid line) and second (dashed line) EOFs.
Figure 6 Scatter plot of zonal mean SST anomalies in the Northern tropics (10-20°N: the horizontal axis) and Southern tropics (10-20°S: vertical axis) on Decadal (left, 8-16 years)
