SIMULATION OF THE IMPACT OF WARM AND COLD EVENTS ON ATMOSPHERIC ENERGY CYCLE AND ZONAL MEAN ATMOSPHERIC CIRCULATION

The newly developed Global Ocean-At mosphere-Land System model (GOALS-5) is employed to investigate the impact of warm (El Niño) and cold(La Nina) events on the atmospheric energy cycle and zonal mean atmospheric circulation, compared to the results of real climate. The analyses show that for the zonally averaged data, most of zonal anomalies of basic at mospheric fields and quantities related to the energy cycle take on obviously opposite changes in the tropics and subtropics between warm and cold events, which does not happen in the mid-latitudes and high-latitudes regions. According to our investigation, during warm episode the change in meridional heat fluxes by the stationary eddies is identified to be the cause for the temperature anomalies in the extratropical Northern Hemisphere troposphere, while the transient eddies give an opposing contribution. During cold episode there is still some compensation of the stationary eddy heat transports by the transient eddy, while impacts of the transient eddy are somewhat enhanced.