numerical simulations of catastrophic floods in china with regional climate model yiming liu, yihui...
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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)
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.