5B.6 53-year downscaling over Japan at 5km coupled with the ECMWF Reanalysis data

Hashimoto, Atsushi, and Hiromaru Hirakuchi, Central Research Institute

To evaluate the influence of weather and climate change on the electric power facilities for the stable electricity supply and energy securities, the reanalysis downscaling for 53 years were conducted over Japan region. WRF-ARW is used for a regional climate model. This model has been improved for applying to regional climate prediction.

We conducted 53-year weather and climate reproduction runs form1958 to 2010. This model used two way nesting (15km and 5km), and boundary conditions are obtained from the ECMWF reanalysis data (T106). Two kind of ECMWF reanalysis dataset are used, one is ERA40 (period: 1958-1988), another is ERA-Interim (period: 1989-2010), and the continuous integration runs were conducted for each reanalysis dataset.

First, the effect of lateral boundary conditions (LBCs) was discussed using GPH at 500hPa and RH at 700hPa, and it showed that the error in the model did not accumulate during the continuous integration runs. Second, the reproduction runs were evaluated using weather observation stations, and the results showed that the model results good agreements with observations. Finally, we obtained that the climatic characteristics of this model have the capability of reproduction and forecasting about the climate with high accuracy.