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

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

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Page 1: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

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)

Page 2: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

ContentContent

Frame of RegCM/NCCSimulative ExperimentsConclusions and Discussion

Page 3: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

Frame of

RegCM/NCC

Page 4: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

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

resolution:60km×60km × 16σ

Page 5: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

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

Page 6: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

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

Page 7: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

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…………

Page 8: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

Simulative Simulative ExperimentsExperiments

Page 9: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

Land-Land-surfacesurfaceProcessProcess

OBSOBSLPM-I BATSLPM-I BATS

TsTsJune 1991June 1991

Page 10: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

LPM-2

OBS BATS

Precipitation

June 1994

Page 11: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

ConvectionConvection

PrecipitationJune 1991

OBS

KUO

MFS

Page 12: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

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

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

Page 13: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

ConvectionConvection

PrecipitationMay-July 1994

OBS

Kuo

MFS

Page 14: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

ConvectionConvection

Betts-MillerBetts-Millerschemescheme

PrecipitationPrecipitation1st May -15t1st May -15t

h July h July 19911991

Page 15: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

OBS Kuo

Betts-Miller

PrecipitationJune-July 1998

Page 16: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

CCM2

CCM3precipitation

May-July 1998

Radiation Radiation OBS

Page 17: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

PBLPBL

Hotslag

TKE

(grasslandplateau

cropdesertocean)

Page 18: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

June 20-30

July 10-31

August 1-10

NCEP Hotslag TKE

Daily precipitation (mm/d)

Page 19: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

ObservationObservation

Height700hPa

May 1-12 1991

Page 20: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

2-D 2-D nesting nesting methodmethod

Height

700Hpa

May 1-12 1991

Page 21: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

3-D 3-D nesting nesting methodmethod

Height

700hPa

May 1-12 1991

Page 22: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

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

Page 23: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

May 25,1991

Wind, 200hPa

Page 24: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

May 25,1991

Wind, 500hPa

Page 25: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

May 25,1991

Wind, 850hPa

Page 26: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

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

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

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

average2000199919981997199619951994199319921991

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

Page 27: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

Rainfall

June 1994

OBS RegCM2

TKE , TKE,

MFS, BM

Radccm3, RadCCM3

Page 28: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

TKE,MFS,RADccm3 TKE,BM,RADccm3

OBS RegCM2

Rainfall

July 1994

Page 29: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

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.

Page 30: Numerical Simulations of Catastrophic Floods in China with Regional Climate Model Yiming Liu, Yihui Ding et al. (National Climate Center)

Thank you.Thank you.