Fig. 2: Evolutions of SST and SLP anomalies composited for multi-year El Niño events over a 3 yr period derived from HadISST and NCEP1 SLP datasets.
From: Multi-year El Niño events tied to the North Pacific Oscillation

a, b JFM(0) SST and SLP anomalies, respectively. c, d JFM(1) SST and SLP anomalies, respectively. e, f JFM(2) SST and SLP anomalies, respectively. The red box in d denotes the region used to compute the SLP index over the Hawaiian region (SLPHI; 155°–125°W, 16°–32°N). In a−f, dots indicate SST and SLP anomalies significant at the 95% confidence level.