ENSO

ENSO

Sea-Surface Temperature Anomalies for the Niño 3.4 Region in Observations, CCSM4 (1°), and CCSM3 (T85).

A similar argument can be made for ENSO. We know that ENSO plays a very important role in seasonal weather phenomena, especially in tropical regions and some extratropical regions, especially in the cold season. Therefore, getting a good simulation of ENSO leads to a more realistic climate simulation and more robust climate statistics. This plot of SST anomalies shows the improvement in both the magnitude and periodicity of ENSO variability between the older CCSM3 and newer CCSM4 simulations.

Overall, it's very important to get a climate model that is not just simulating mean temperature and moisture distribution, but also simulating these various modes of variability.