Cross section down to 1000 metres depth of the Pacific. It soon becomes apparent why we are struggling to have an El Nino develop.
1997, the super El nino. Notice the extremely warm water on the equator, typifying a very strong el nino
2009 moderate El nino.
Notice the difference, 2009 has a lot more cooler water especially north of the equator.
Now look at 2012.
Now look at all the cold water, compliments of the Cold PDO. And getting progressivelyt cooler, apart from a small section along the equator there is a lot of cooling going on which is the climates way of responding to the warm PDO of the 80s and 90s.