Figure 3b: Spatial structure during one phase of the observed SST decadal variability in the Pacific, as determined by the POP analysis of Latif et al. (1997).
The interannual oscillation is absent in a test solution when coupling is suppressed from 10｡? to 10｡?, demonstrating that near-equatorial, ocean-atmosphere interactions are essential for its existence. Both tropical and subtropical variables, however, have a decadal oscillation that closely resembles that in the main-run oscillation, indicating that its origin lies outside the tropics. To locate the generation region more precisely, we obtained a test solution without coupling both from 10｡? to 10｡? and from north of 35｡?.
