An ensemble of climate simulations with the CPTEC T062L28 AGCM is performed in order to obtain the present and Mid-Holocene (MH) climate in South America. The climatological characteristics simulated by the model are compared with PMIP models and paleoclimate records, and emphasis is given to the Southern Hemisphere and South America (SA). The orbital parameter and the CO2 concentration are changed for typical MH values. In general, the model simulations indicate a wetter Northeast. In the central region, south and southeast of the continent, the MH climate was marked by reduced precipitation in comparison with the present model climate. A cooling signal is observed in the MH according to the paleoclimatic evidences. A increase of the intensity of the 850 hPa flow over the continent is produced by the model in the MH climate in comparison with the present model climate. The South Atlantic subtropical high intensity is increased and less intense climatological northerly flow east of the Andes during all seasons. This weakening of the northerly flow has a significant impact on the moisture transport from the Amazon to the La Plata basin, and consequently over the SACZ.
Mid Holocene; South America; CPTEC AGCM; paleoclimate
