The weakening of the Walker circulation arises in these models from processes that are fundamentally different from those of El Nià ± o — and is present in both mixed - layer and full - ocean coupled models, so is not dependent on the models» ability to represent Kelvin waves (by the way, most of the IPCC - AR4 models have sufficient oceanic
resolution to represent Kelvin waves and the physics behind them is
quite simple — so of all the model deficiencies to focus on this one seems a little odd).