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