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Understanding the Earth's climate system and§particularly climate variability presents one of the§most difficult and urgent challenges in science. The§Antarctic plays a crucial role in the global climate§system, since it is the principal region of radiative§energy deficit and atmospheric cooling. The§regional climate model HIRHAM has been used for§investigating the climate of Antarctica. In§comparison with the observations, the evaluation§shows that the simulations with the HIRHAM§model capture both the large and regional scale§circulation features with generally small bias in the§modeled variables. The decadal scale processes§were studied based on trend calculations. To better§understand the horizontal structure of mean sea level§pressure, temperature and net mass§balance trends the influence of the Antarctic §Oscillation (AAO) on the Antarctic climate was §investigated. For detailed investigation of global§teleconnection, two positive and one negative periods§of AAO phase were chosen. The differences in MSLP and§2m temperature between positive§and negative AAO years during the winter months §partly explain the surface cooling during the last§decades.