Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui...

Numerical Simulations of Numerical Simulations of Catastrophic Floods in China Catastrophic Floods in China with Regional Climate Modelwith Regional Climate Model

Yiming Liu, Yihui Ding et al.

(National Climate Center)

ContentContent

Frame of RegCM/NCCSimulative ExperimentsConclusions and Discussion

Frame of

RegCM/NCC

RegCM/NCC DomainRegCM/NCC Domaincenter point:115E,30N

resolution:60km×60km × 16σ

Vertical grid structureVertical grid structure in RegCM/NCC in RegCM/NCC

Modification of NCAR Modification of NCAR RegCM2RegCM2

Physical Process NCAR RegCM2 RegCM/NCC Land-surface LPM1

process BATS LPM2

Cumulus Kuo － Anthes Mass Flux Scheme convection Grell Betts － Miller

Radiation

transfer CCM2 CCM3

PBL Holtslag TKE

the Tibetan Plateauthe Tibetan Plateauthe Three-Dimensional nesting methodthe Three-Dimensional nesting method

Initial dataInitial datalateral boundary datalateral boundary data

RegCM/NCC RegCM/NCC 70-160E, 10-60N

center point: 115E, 30N60km ×60km ×16σ

RegCM/NCCRegCM/NCCRegCM/NCCRegCM/NCC

Land-use dataLand-use datasurface datasurface data

Land-use dataLand-use datasurface datasurface data

LPM1LPM1LPM2LPM2

LPM1LPM1LPM2LPM2

Mass Flux SchemeMass Flux SchemeBetts-MillerBetts-Miller

CCM3 radiation schemeCCM3 radiation scheme

Mass Flux SchemeMass Flux SchemeBetts-MillerBetts-Miller

CCM3 radiation schemeCCM3 radiation scheme

TerrainTerrainTerrainTerrain TKE schemeTKE schemeTKE schemeTKE scheme

Three dimensional nestingThree dimensional nestingThree dimensional nestingThree dimensional nesting

Out dataOut dataT,Pr,q,u,v,H,TT,Pr,q,u,v,H,Tsoilsoil,q,qsoilsoil…………

Simulative Simulative ExperimentsExperiments

Land-Land-surfacesurfaceProcessProcess

OBSOBSLPM-I BATSLPM-I BATS

TsTsJune 1991June 1991

LPM-2

OBS BATS

Precipitation

June 1994

ConvectionConvection

PrecipitationJune 1991

OBS

KUO

MFS

Daily precipitation averaged over region (114-122E,28-34N)In May-July 1991 （ mm/d ）

Black: OBS ； Green: Kuo ； Blue: Grell ； Red: MFS

ConvectionConvection

PrecipitationMay-July 1994

OBS

Kuo

MFS

ConvectionConvection

Betts-MillerBetts-Millerschemescheme

PrecipitationPrecipitation1st May -15t1st May -15t

h July h July 19911991

OBS Kuo

Betts-Miller

PrecipitationJune-July 1998

CCM2

CCM3precipitation

May-July 1998

Radiation Radiation OBS

PBLPBL

Hotslag

TKE

(grasslandplateau

cropdesertocean)

June 20-30

July 10-31

August 1-10

NCEP Hotslag TKE

Daily precipitation (mm/d)

ObservationObservation

Height700hPa

May 1-12 1991

2-D 2-D nesting nesting methodmethod

Height

700Hpa

May 1-12 1991

3-D 3-D nesting nesting methodmethod

Height

700hPa

May 1-12 1991

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

May 25,1991

Wind, 200hPa

May 25,1991

Wind, 500hPa

May 25,1991

Wind, 850hPa

6/10+-+-+-+-++South China

7/10+++++-+-++Changjiang River

5/10+--+-+-+-+North China

average2000199919981997199619951994199319921991

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 RegCM2

Rainfall

July 1994

Conclusions and DiscussionConclusions and Discussion

RegCM/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.Thank you.