1. Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

2. Content §Frame of RegCM/NCC §Simulative Experiments §Conclusions and Discussion

3. Frame of RegCM/NCC

4. RegCM/NCC Domain center point:115E,30N resolution:60km×60km × 16σ

5. Vertical grid structure in RegCM/NCC

6. Modification of NCAR RegCM2 Physical Process NCAR RegCM2 RegCM/NCC Land-surface LPM1 process BATS LPM2 Cumulus Kuo － Anthes Mass Flux Scheme convection Grell Betts － Miller Radiation transfer CCM2 CCM3 PBL Holtslag TKE the Tibetan Plateau the Three-Dimensional nesting method

7. Initial data lateral boundary data RegCM/NCC 70-160E, 10-60N center point: 115E, 30N 60km × 60km × 16 σRegCM/NCCRegCM/NCC Land-use data surface data LPM1LPM2 Mass Flux Scheme Betts-Miller CCM3 radiation scheme Mass Flux Scheme Betts-Miller CCM3 radiation scheme Terrain TKE scheme Three dimensional nesting Out data T,Pr,q,u,v,H,T soil,q soil ……

8. Simulative Experiments

9. Land- surface Process OBS LPM-I BATS §Ts §June 1991

10. LPM-2 OBS BATS Precipitation June 1994

11. Convection §Precipitation §June 1991 OBS KUO MFS

12. Daily precipitation averaged over region (114-122E,28-34N) In May-July 1991 （ mm/d ） Black: OBS ； Green: Kuo ； Blue: Grell ； Red: MFS

13. Convection §Precipitation §May-July 1994 OBS Kuo MFS

14. Convection Betts-Miller scheme Precipitation 1st May - 15th July 1991

15. OBS Kuo Betts-Miller Precipitation June-July 1998

16. §CCM2 §CCM3 §precipitation §May-July 1998 Radiation OBS

17. PBL PBL Hotslag TKE (grassland plateau crop desert ocean)

18. June 20-30 July 10-31 August 1-10 NCEP Hotslag TKE Daily precipitation (mm/d)

19. Observation Observation Height 700hPa May 1-12 1991

20. 2-D nesting method Height 700Hpa May 1-12 1991

21. 3-D nesting method Height 700hPa May 1-12 1991

22. Height 700hPa July 31 1991 Height 700hPa July 31 1991 observation 2-D nesting method 3-D nesting method July 1-31 1991 May 1- July 31 1991

26. 6/10+-+-+-+-++South China 7/10+++++-+-++Changjiang River 5/10+--+-+-+-+North China average2000199919981997199619951994199319921991 Compare of rain belt between OBS and simulation ( RegCM/NCC )

27. Rainfall June 1994 OBS RegCM2 TKE, TKE, MFS, BM Rad ccm3, Rad CCM3

28. TKE,MFS,RAD ccm3 TKE,BM,RAD ccm3 OBS RegCM2 Rainfall July 1994

29. Conclusions and Discussion §RegCM/NCC is feasible and steady. §Simulative results show that the new schemes can improve the simulation in some degree. §In next 1-2 years we will make more simulations and predictive experiments to verify the performance of RegCM/NCC.

30. Thank you.