Slide 1

PRECIPITATION AND TEMPERATURE CLIMATE INDICES IN SOUTH AMERICA AND SO PAULO STATE, BRAZIL Amanda Sabatini Dufek Trcio Ambrizzi Rosmeri Porfirio da Rocha Department of Atmospheric Sciences University of So Paulo, Brazil Slide 2 OBJECTIVES Some indices based on daily data of precipitation and maximum and minimum temperature will be calculated for present climate (1960-1990) over South America and So Paulo State, Brazil, based on climate simulations data from a global climate model (HadAM3) and a regional climate model (RegCM3) and also using observational data from many available stations in the region. The main goal of this work is to compare the simulated and observed indices over South America and So Paulo State, Brazil, during the period 1960-1990. Slide 3 DATA SIMULATION DATA The HadAM3 global climate model has a horizontal resolution of 1.25 of latitude by 1.875 of longitude and 19 vertical hybrid coordinates levels. The simulation data is from 1960 to 1990. The RegCM3 regional climate model was integrated over South America with a spatial resolution of 60km and 23 vertical sigma levels (top of the model at 50hPa). The simulation was done for the same period of the HadAM3. The atmospheric initial boundary conditions and the Sea Surface Temperature (SST) for the RegCM3 simulation were provided by the HadAM3 model. OBSERVATIONAL DATA Precipitation and Temperature maximum and minimum daily data obtained from the Agronomic Institute of Campinas (IAC), Department of Water and Electric Energy (DAEE), National Institute of Meteorology (INMET) and gua Funda station. Slide 4 INDICES Maximum Temperature Warm days (wd) Percentage of days with Tmax>90th percentis (%) Cold days (cd) Percentage of days with Tmax90th percentis (%) Cold nights (cn) Percentage of days with Tmin