Prediction of Summer Precipitation Anomalies over China by CAM-RegCM Nested Model

The newly global atmosphere general circulation model CAM is nested with the regional climate model RegCM in order to predict the summer precipitation anomaly over China. The ensemble hindcast experiments from 1984 to 2000 are performed, and their results indicate that CAM-RegCM has some forecasting skills on the summer precipitation anomaly, that is the prediction score is above 80, the anomaly correlation coefficient can reach 0.29, and the forecasting effect is better in the north of East China than in the south. The real time forecast experiments from 2003 to 2007 show that it is correlated better in 2003, 2004, 2006 and 2007. Furthermore, correction is one important step in the short-term climate prediction.