1. Mr. Shimura （ＲＩＳＴ） Dr. Takahashi （ Obirin University ） New HPC Development and Its Application to 3D Microphysics Cloud Simulation

2. Model Description Cloud Model ： by Prof. Takahashi （１９７ ６） – Three-Dimensional – Anelastic, Non-Hydrostatic – Detailed Microphysics

3. Microphysics Processes Nucleus of Cloud Drops Nucleus of Cloud Drops Initial Cloud Drops Initial Cloud Drops Raindrops Frozen Drops Frozen Drops Nucleus of Ice Crystals Nucleus of Ice Crystals Initial Ice Crystals Initial Ice Crystals Hail Graupel Ice Crystals Nucleation of Water Particles Collection Vapor Diffusion Condensation Nucleation Contact Nucleation Riming Vapor Diffusion Immersion Freezing Deposition Nucleation Collection Riming Vapor Diffusion Breakup Melting

4. Model Overview Dynamics Thermodynamics Dynamics Thermodynamics Microphysics (collection,breakup) Microphysics (collection,breakup) Re-start Data Δt = 1 sec 10 sec times Leap-frog and Smoothing Re-start Data

5. Parallelization Methodology → Equal areas of Volume given to each processor Communication : Ｍｅｓｓａｇｅ Ｐａｓｓｉｎｇ Ｉｎ ｔｅｒｆａｃｅ Ｘ Ｘ Ｙ Ｙ

6. Numerical Simulation Problem size → １１１ × １１１ × ６１ Δ ｘ＝４００ｍ Δ ｙ＝４００ｍ Δ ｚ＝２００ｍ Boundary Conditions Ｘ： Open Ｙ： Open Ｚ： Rigid free slip Data ： 2.5 ＧＢ ・ dynamics : 0.8GB ・ cloud microphysics : 1.7GB Data ： 2.5 ＧＢ ・ dynamics : 0.8GB ・ cloud microphysics : 1.7GB ４５ ｋｍ 12k m

7. Environmental Conditions Maritime ＩＣＥ ・ ＷＡＲＭ ・ ＦＲＯ ＺＥＮ Continental ＩＣＥ ・ ＷＡＲＭ

8. Microphysics Sensitive – Vertical Latent Heat Profile – Rainfall Amount and Pattern – Cloud Organization

16. In Maritime-Ice Condition Mother Cell Graupel Capture Daughter Cell Drizzle – Intense Rainfall – Low Level HIGH – New Raincells to N-S Direction

18. Ice Contribution – Ice/Vapor > 0.5%, Ice Contributes to Rain – Torrential Rain only with Ice – Continental Slow Process, 1/3 effective

19. Conclusion – Both Rain Amount and Cloud Organization are sensitive to Microphysics – Rain Accumulation near Freezing Level through Graupel or Frozen Drop Growth

20. Future Plans Model Physics –Large Domain Calculation more than ４００ｋｍ × ４００ｋｍ × １５ｋｍ Computational –Optimal Load Balancing –Optimal Data Structure –Visualization （？？？）

21. ３次元雲微物理（ BIN ）モデル （ ４５ｋｍ × ４５ｋｍ × １２ｋｍ ） T=60min.T=80min. T=120min.T=100min. 氷晶 雲粒 霧雨 霰・雹 雨滴