From the AGU Highlights on Eurekalert, how to make models do what you want by removing important portions of the natural system:
Atmospheric dynamics, not ocean, could drive El Niño features
Scientists generally believe that ocean dynamics are the primary factor controlling El Niño sea surface temperature variability. However, new simulations show that atmospheric dynamics can account for many of the features of El Niño that were previously thought to be controlled by ocean dynamics. Dommenget uses a series of atmospheric model simulations coupled to a simple ocean model that contained no ocean dynamics.
He finds that El Niño–like variations in sea surface temperature were produced in the simulations. Although ocean dynamics are a factor influencing El Niño events, the study suggests that atmospheric dynamics may be more important than previously thought in controlling El Niño. The study could change scientists’ understanding of the mechanisms driving El Niño.
Title: The slab ocean El Niño
Author: Dietmar Dommenget: School of Mathematical Sciences, Monash University, Clayton, Victoria, Australia.
Geophysical Research Letters, doi:10.1029/2010GL044888, 2010
Stay tuned for models that produce global heating without containing any earth-solar dynamics, like that pesky dirunal variation or seasons.