Typhoon Simulation by Using a Global Cloud Resolving Model on
Earth Simulator
W. Yanase, S. Iga, T. Nasuno, H. Miura, H. Tomita, and M. Satoh
31st October, 2006
1.development of the model
2.preliminary result of typhoon simulation
Targets of Global Cloud-Resolving Model
• Multi-scale convection– Tropical cyclones– Madden Julian Oscillation– Cloud clusters
• Effects of cumulus clouds on climate– condensational heating– precipitation– vertical transport– radiation
Development of Global Model “NICAM”
“Nonhydrostatic” + “ICosahedral” Atmospheric Model
Glevel-1 Glevel-3 Glevel-5Icosahedral
Glevel-0
dx = 14 kmGlevel-9
dx = 7 kmGlevel-10
dx = 3.5 kmGlevel-11
current
Schemes of Physics in NICAM
• Turbulance: Mellor & Yamada level-2• Radiation: MSTRNX (Sekiguchi & Nakajima, 2006)
• Cloud microphysics: Grabowski (1998)• Cumulus convection
– Arakawa & Shubert for dx > 30 km– Not used for dx = 3.5 km, 7 km, 14 km
History of NICAM
• First simulation (e.g. Tomita & Satoh, 2004)
• Aqua planet experiment (e.g. Tomita et al., 2005)
– dx = 3.5 km, 10-day integration – eastward propagating multi-scale clusters
• Real topography (e.g. Miura et al.; submitted to GRL)
– dx = 3.5 km, 7 km, 14 km– simulation of a typhoon in Apr. 2004
• Simulations with dx=3.5km, 7km, 14km are performed on Earth Simulator computer, and the results are currently analyzed by scientists in Japan & USA
Experimental Design of Typhoon Simulation
• Model: NICAM• Topography: GTOPO30 (smoothed)• Initial condition:
– NCEP tropospheric analyses (1.0deg x 1.0deg) – 00:00UTC on 1st April 2004– no bogusing modifications
• Time integration– 7 days for dx = 3.5 km (Glevel-11)– 10 days for dx = 7 km (Glevel-10)– 30 days for dx = 14 km (Glevel-9)
Animation of simulated OLR (dx=3.5km)
Satellite Observation & Model Results
Apr 02 00UTC
Apr 03 00UTC
(http://weather.is.kochi-u.ac.jp/)
dx~3.5 km dx~7 km dx~14 km
OLR
Satellite Observation & Model Results
Apr 04 00UTC
Apr 05 00UTC
dx~3.5 km dx~7 km dx~14 km
Satellite Observation & Model Results
Apr 06 00UTC
Apr 07 00UTC
dx~3.5 km dx~7 km dx~14 km
Precipitation (April 5th)AMSR-E dx~3.5 km
dx~7 km dx~14 km
Radial-Vertical Structure (dx=14km: Apr. 7th 12UTC)
z=10km
r=500km
tangentialwind
radialwind
verticalwind
Radial-Vertical Structure (dx=14km, Apr. 7th 12UTC)
z=10km
r=500km
temperatureanomaly
relativehumidity
condensedwater
Future Plans
• Technical issue– improvement of turbulence scheme– Kain-Fritsch scheme for dx > 7 km
• Case study of TC: dx = 3.5 km, ~10 day– validation with observational data
• Formation of TC: dx = 7 km, 14 km, ~30 day– little influence of initial condition
• Climatology of TC: dx = 30 km , 60km; 1 year ~– distribution of genesis and development
Thank you
Computational Costs
• SR11000(20proc): 100-day real time– glevel-6 (120km): ~20000day– glevel-7 (60km): ~2500day– glevel-8 (30km): ~300day
• Earth Simulator: 100,000 node-hour a year – glevel-8 (30km): ～ 10000day– glevel-9 (14km): ～ 1200day– glevel-10 (7km): ～ 300day– glevel-11 (3.5km): ～ 40day
Time evolution of SLP at TC center
Precipitable Water: AMSR-E & dx=3.5km
dx = 14 km at 12 UTC 7th April
Radial-Vertical Structure (dx=14km)
z=10km
r=500km
water vapor
potentialtemperature
equivalentP.T.
Radial-Vertical Structure (dx=14km)
z=10km
r=500km
cloud water
rain snow
Zonal-Vertical Section: dx=14km
meridional wind vertical wind
Parameter of Turbulence
(mean over 10S-10N)
Parameter of Turbulence
Disturbances over Northwestern Pacific
