Variabilidade Climatica do Oceano Austral usando um modelo acoplado do NCAR

The purpose of this study is to analyze the climatic variability of the Southern ocean and investigate the Antarctic Circumploar wave (ACW). Data from a simulation of 150 years with the ational Center for Atmospheric Research/Community System Model-NCAR CCSM coupled model are used. Annual and seasonal climatology are obtained from the following variables: seas surface temperatute (SST), sea level pressure (SLP) and zonal wind. Hovmoeller diagrams and power spectra are used to analyze changes in interannula behavior of these variables and of the subsurface temperature at 250m depth (T250). The model shows for the SLP annual mean good respresentation of the large scale features in the extra-tropics like pressure decreasing monotonic toward high latitudes. Hovmoeller diagrams show an eastward propogation of the SLP, SST and T250 anomalies. The spectral analyzes of T250 anomalies presents an energy peak at the 95% significance level at a 5,5 year period. Model simulations of the ACW demnstrate that there exists a coupling between ocean and atmosphere.