Preliminary Analysis on the Global Features of the NCEP CFSv2 Seasonal Hindcasts

The representation of the CFSv2 ocean-atmosphere ensemble hindcasts is investigated during Dec-Jan-Feb (DJF) and Jun-Jul-Aug\ud(JJA) from 1983 to 2010.The skill anomaly correlations showed that in some continents the forecasts do not have dependency with\udchanges in the initial conditions. Also, in both seasons the model has a higher skill at the 0-month lead time with the largest spatial\udbiases occurring over the North America, South America, and Oceania. Over the continents the largest biases in the nonlinearity\udof El Ni˜no minus La Ni˜na events are found over the eastern South Africa, part of Oceania, and central-southeastern parts of South\udAmerica. During DJF the main biases are related to double-ITCZ, strengthening of SPCZ, and deepening of the Aleutian and\udIcelandic low pressures.The simulation of a warmer SST on the eastern of most austral oceans, the strengthening (weakening) of\udthe Subtropical (Polar) Jet over the Southern Hemisphere, and the weakening of the zonal circulation near the Antarctic continent\udare also found in both seasons. Over the central-eastern Equatorial Pacific a cooler bias in SST is found during JJA.These biases\udare interpreted by analyses of the simulated global mean-state and their impact on the main patterns of variabilityFAPESP - 08/58101-9CNP