Fig. S6.

Evolution of different El Niño events as described by the Niño3, Niño4, and Niño3.4 indices in (A) 2014, (B) 1997, (C) 2009, and (D) 2006. The 1997/1998 and 2009/2010 events give examples of an extreme EP El Niño and a weak CP El Niño, respectively. The very weak 2014/2015 warm event is characterized by a small but relatively uniform warming, stretching in November and December across the entire equatorial Pacific basin and reminiscent of but slightly weaker than that in 2006. Note the rapid drop in all three indices in the middle of 2014 that can be explained by the June EWB. A and B are reproduced from Fig. 1 A and B.