Biases and improvements of the ENSO-East Asian winter monsoon teleconnection in CMIP5 and CMIP6 models

The influence of El Niño–Southern Oscillation (ENSO) on the East Asian winter monsoon (EAWM) is investigated based outputs phase 6 Coupled Model Intercomparison Project (CMIP6) models and compared to that in 5 (CMIP5). Results show overall CMIP6 reproduce ENSO-EAWM teleconnection more realistically than CMIP5 models, although they still somewhat underestimate observed. Based intermodel spread simulated CMIP5/CMIP6 we reveal commonly underestimated among can be traced back excessive extension cold tongue equatorial western Pacific. A model with a stronger climatological favors generating westward ENSO-related SST anomaly pattern, which turn forces an anomalous cyclonic circulation over Northwest Pacific (NWP). It offsets anticyclonic anomalies NWP weakens teleconnection. Compared most better simulate mean state resultant present results suggest substantial efforts should made reduce bias mean-state for further improving simulation projection Asian-western climate.