WU Di, PEI Yuan-sheng (State Key Laboratory of Simulation and Regulation of River Basin Water Cycle, China Institute of Water Resources and Hydropower Research, Beijing 100038, China)

Abstract: Different initial and lateral boundary conditions have direct influence on the simulated results of Regional Climate Model. Using two sets of NNRP1 and ERA40 reanalysis datasets as the initial and boundary driving fields, two simulated schemes by RegCM3 with 20km grid space and the cumulus parameterization scheme of Anthes-Kuo are conducted to analyze the precipitation and temperature in the Hai River Basin in summer (June.-Aug.), 1998. The simulated results indicate that RegCM3 driven by two datasets of NNRP1 and ERA40 can perform the large scale characteristics of precipitation and temperature in the Hai River Basin. In the aspects of location and distributed scope of precipitation and high (or low) temperature centers, the simulated results of ERA40 are better than those of NNRP1, while the simulated results of precipitation and temperature interpolated to station in daily, monthly and seasonal scales are also better than those of NNRP1. However, the simulation of extreme precipitation process is not good in two schemes. In this case, the ERA40 reanalysis datasets with much reliability is suitable for the numerical simulation of climate change in the Hai River Basin.

Key words: Regional Climate Model (RegCM3), Initial and lateral boundary conditions, NNRP1 reanalysis datasets, ERA40 reanalysis datasets, Hai River Basin

Published in: Journal of China Institute of Water Resources and Hydropower Research (Vol. 10 No. 2, 2012)