Tropical variability and stratospheric equatorial waves in the IPSLCM5 model

摘要: The atmospheric variability in the equatorial regions is analysed Earth System Model pre-industrial simulation done at IPSL framework of CMIP5. We find that model has an interannual about right amplitude and temporal scale, when compared to El-Nino Southern Oscillation (ENSO), but too confined western Pacific. At intra-seasonal periods, lacks large-scale organisation, only produces one characteristic Madden-Julian every 10 winters typically. shorter time-scales troposphere, Rossby Kelvin Convectively Coupled Equatorial Waves (CCEWs), underestimates CCEWs signal on OLR. In stratosphere, a composite analysis shows Temperature velocities fluctuations due waves are quite realistic. nevertheless, stratospheric less related convection than observations, suggesting their forcing by midlatitudes plays larger role. Still model, not predominantly occurring during life cycle tropospheric CCEWs, behaviour we be dominant observations. also used illustrate how modify zonal mean-flow, show weak this respect. This illustrates can have reasonable temperature, same time underestimate mean flow. use very long establish significantly affected ENSO, hence supporting idea ENSO influence Quasi-Biennial Oscillation.