ScienceDaily (Oct. 17, 2010) — While it's still hotly debated among scientists whether climate change causes a shift from the traditional form of El Nino to one known as El Nino Modoki, scientists now say that El Nino Modoki affects long-term changes in currents in the North Pacific Ocean.
http://www.sciencedaily.com/releases/2010/10/101017133641.htm