NICAM Successfully Simulates Real Tropical Cyclones H Fudeyasu

NICAM Successfully Simulates Real Tropical Cyclones H. Fudeyasu, Y. Wang (IPRC), M. Satoh, T. Nasuno, W. Yanase, H. Miura (FRCGC) (a) Observed and simulated storm tracks of Tropical Cyclone Bondo and Tropical Storm Isobel (b) Tropical Cyclone Bondo: Vertical Structure Eye wall Rainband NICAM TC BONDO, Dec 18 -26 2006 OBS(JTWC) TS ISOBEL, Jan 2 -3 2007 NICAM (c) Tropical Cyclone Bondo: Horizontal Structure TRMM surface rain A B NICAM surface rain and wind C D The first successful simulations of real tropical cyclones by a global cloud-resolving model, the Nonhydrostatic ICosahedral Atmospheric Model (NICAM), at a resolution of dx= 7 km. Shown in: (a) are JTWC best track data for Tropical Cyclone Bondo and Tropical Storm Isobel and the NICAM storm tracks for these two disturbances; (b) NICAM vertical structure of the eye wall and rain band of Bondo; (c) TRMM and NICAM horizontal Slide 2

Tropical Storm Isobel: MJO Triggered Cloud Features Meteorological satellite data: 2 Jan, 2007 black body temperature showing clouds NICAM 18 days integration (2 Jan ) MJO Tropical Storm Isobel was triggered by the cyclonic wind shear due to westerly wind bursts near the Equator. TS Isobel Evolution of TS Isobel in NICAM: Surface rain rate in mm/h (color bar) and wind 9 days 14 days 17 days MJO TS genesis MJO TS born Evolution of TS Isobel in NICAM shows that strong westerly wind bursts around the Equator increased cyclonic vorticity south of the Equator, generating Tropical Storm Isobel.