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

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

ContentFrame of RegCM/NCCSimulative ExperimentsConclusions and Discussion

Frame ofRegCM/NCC

RegCM/NCC Domaincenter point:115E,30Nresolution:60km60km 16

Vertical grid structure in RegCM/NCC

Modification of NCAR RegCM2Physical Process NCAR RegCM2 RegCM/NCC Land-surface LPM1process BATS LPM2 Cumulus KuoAnthes Mass Flux Scheme convection Grell BettsMillerRadiation transfer CCM2 CCM3 PBL Holtslag TKE

the Tibetan Plateauthe Three-Dimensional nesting method

Initial datalateral boundary dataRegCM/NCC 70-160E, 10-60Ncenter point: 115E, 30N60km 60km 16RegCM/NCCLand-use datasurface dataLPM1LPM2Mass Flux SchemeBetts-MillerCCM3 radiation schemeTerrainTKE schemeThree dimensional nestingOut dataT,Pr,q,u,v,H,Tsoil,qsoil

Simulative Experiments

Land-surfaceProcess

OBSLPM-I BATS

TsJune 1991

LPM-2 OBS BATSPrecipitation June 1994

ConvectionPrecipitationJune 1991OBSKUOMFS

Daily precipitation averaged over region (114-122E,28-34N)In May-July 1991mm/dBlack: OBSGreen: KuoBlue: GrellRed: MFS

ConvectionPrecipitationMay-July 1994OBSKuoMFS

Convection

Betts-Millerscheme

Precipitation1st May -15th July 1991

OBS Kuo

Betts-MillerPrecipitationJune-July 1998

CCM2CCM3precipitationMay-July 1998Radiation OBS

PBL

Hotslag

TKE

(grasslandplateaucropdesertocean)

June 20-30

July 10-31

August 1-10

NCEP Hotslag TKE Daily precipitation (mm/d)

Observation

Height700hPaMay 1-12 1991

2-D nesting methodHeight700HpaMay 1-12 1991

3-D nesting methodHeight700hPaMay 1-12 1991

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

May 25,1991Wind, 200hPa

May 25,1991Wind, 500hPa

May 25,1991Wind, 850hPa

Compare of rain belt between OBS and simulation ( RegCM/NCC )

Rainfall June 1994

OBS RegCM2 TKE , TKE, MFS, BM Radccm3, RadCCM3

TKE,MFS,RADccm3 TKE,BM,RADccm3 OBS RegCM2Rainfall July 1994

Conclusions and DiscussionRegCM/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.

Thank you.