Relationships Between the Large-Scale ENSO Processes and the Peculiarities of Reginal Climate on the Territory of Brazil

tionships. Based on the concept of climate regimes we carried out diagnostical investigations of the atmospheric circulation over Brazil. The aim of this study is to find a connection of regional climate anomalies with a small number of large-scale patterns which are typical for ENSO processes. The main regional climate anomalies over Brazil are the heavy rainfall in South and East of Brazil and the drought in North and North-East of Brazil. To understand the physics of the processes which lead to these events and searching for their predictors we analyzed various as daily meteorological fields (geopotential, temperature, humidity, horizontal velocity, surface pressure)) as monthly averaged fields. Using these basic fields, new fields (stream function, potential vorticity, divergence of humid fluxes, heat sources) were obtained as well as integral atmospheric characteristic such as kinetic energy, available potential energy, vorticity charge, angular momentum. The 15 first coefficients of spherical harmonics in the decomposition of geopotential and potential vorticity fields also were calculated for the Southern Hemisphere. These characteristics were correlated with the anomalies of precipitation in various regions of Brazil. For these regions we also calculated mean Brunt-Väisällä frequency, mean divergence of humid fluxes, and the principal components in the geopotential field. All these calculations were carried out for period 1963-1992. The results of this analysis confirm the correlation between ENSO events and regional climate anomalies, and reveal new interesting features this rela