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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)
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ContentContent
Frame of RegCM/NCCSimulative ExperimentsConclusions and Discussion
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Frame of
RegCM/NCC
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RegCM/NCC DomainRegCM/NCC Domaincenter point:115E,30N
resolution:60km×60km × 16σ
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Vertical grid structureVertical grid structure in RegCM/NCC in RegCM/NCC
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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
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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…………
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Simulative Simulative ExperimentsExperiments
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Land-Land-surfacesurfaceProcessProcess
OBSOBSLPM-I BATSLPM-I BATS
TsTsJune 1991June 1991
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LPM-2
OBS BATS
Precipitation
June 1994
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ConvectionConvection
PrecipitationJune 1991
OBS
KUO
MFS
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Daily precipitation averaged over region (114-122E,28-34N)In May-July 1991 ( mm/d )
Black: OBS ; Green: Kuo ; Blue: Grell ; Red: MFS
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ConvectionConvection
PrecipitationMay-July 1994
OBS
Kuo
MFS
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ConvectionConvection
Betts-MillerBetts-Millerschemescheme
PrecipitationPrecipitation1st May -15t1st May -15t
h July h July 19911991
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OBS Kuo
Betts-Miller
PrecipitationJune-July 1998
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CCM2
CCM3precipitation
May-July 1998
Radiation Radiation OBS
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PBLPBL
Hotslag
TKE
(grasslandplateau
cropdesertocean)
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June 20-30
July 10-31
August 1-10
NCEP Hotslag TKE
Daily precipitation (mm/d)
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ObservationObservation
Height700hPa
May 1-12 1991
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2-D 2-D nesting nesting methodmethod
Height
700Hpa
May 1-12 1991
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3-D 3-D nesting nesting methodmethod
Height
700hPa
May 1-12 1991
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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
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May 25,1991
Wind, 200hPa
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May 25,1991
Wind, 500hPa
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May 25,1991
Wind, 850hPa
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6/10+-+-+-+-++South China
7/10+++++-+-++Changjiang River
5/10+--+-+-+-+North China
average2000199919981997199619951994199319921991
Compare of rain belt between OBS and simulation ( RegCM/NCC )
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Rainfall
June 1994
OBS RegCM2
TKE , TKE,
MFS, BM
Radccm3, RadCCM3
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TKE,MFS,RADccm3 TKE,BM,RADccm3
OBS RegCM2
Rainfall
July 1994
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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.
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Thank you.Thank you.