Climate Figure 18
Periods of Abrupt Change in the PDO, the NPI and the NAO
Figure 18. Periods of abrupt change in the PDO, the NPI and the NAO. The PDO and the NPI, both in the Pacific, change at the same time an in a consistent, opposite direction. The NAO, in the Atlantic, has the same change-points, but the direction of the change is not consistent with that of the Pacific series (From Schwing et al. 2003).