Upload
others
View
3
Download
0
Embed Size (px)
Citation preview
TheRadia)onFluxesofNCEP/ClimateForecast
SystemReanalysisValidatedwithCERES‐ERBE
S-K Yang, Y-T Hou, C.S. Long, T. Wong, and D. Rutan Acknowledgement:W.Ebisuzaky,H‐TLee,andCFSRproduc)onteamCERES STM, NewportNews,VA,Apr27‐29,2010
Outline:• CFSRIntro–
CFSR(R),Model‐streams–Obdataradia8onmodules
Datasource• FluxComparisonwithCERES‐EBAFdata
• Tropical20NSTimeSeries‐ERBE
• Remarks
WhythisReanalysis:Forgenera7ngre‐forecasts,forthecalibra7onof
theNCEPopera7onalClimateForecastSystem,CFS
Analysis&ModelAPributes
• CoupleAtmos‐ocean‐landmodels(NCEP+MOM4+NOAH)• CoupledAnalysisSystem(GSI+GODAS+GLDAS)• AssimilateSatelliteRadiance• Atmmodelresolu8onT382,~38km,AtmLayer:T64,topat
0.26hPa.• Ocean:0.250atEqu,extto0.50beyondtrop.40layer,to
4737m• Land:4soillevel• SeaIce:3level• Convec8on:S.Arakawa‐Schubert(PanandMoorthi)• Radia8onRRTM,SW/LW,computa8onfreq.–hourly• Varia8onalCO2,StratoAerosol(SAMII,Sato‘93)
NCEPOpera)onalSWRadia)onvs.CFSRRRRTMSWRadia)on
NCEP(GFS‐Chou) RRTM(CFSRR‐Iacono,2000)DescripIon: ‐8uv+vis,1‐nir; 5uv+vis,9‐nirbnds
‐38k‐disterms; 112cor‐kterms‐O3,H2O,CO2,O2; O3,H2O,CO2,O2,CH4
Advantages: ‐Comp.Efficient; Accu.(useARM’sdata) clr‐sky‐10‐30w/m^2 reducIon all‐sky‐adv.scheme
Disadvantages: ‐largeerrors; Comp.slow,4Imesclr‐sky‐undest; slowerthanoprtnlswcld‐sky‐ovrest;
Opera)onalCFSGFDL‐LWRadia)onvs.CFSRRRRTM‐LWRadia)on
GFDL(Fels‐Schwrtz.) RRTM(Mlaweretal.‘97)DescripIon: ‐15bands; 16bands
‐transtbllook‐up; 140cor‐kterms‐O3,H2O,CO2; O3,H2O,CO2,O2,CH4
CO,4CFCs
Advantages/ ‐compefficient; becercompefficientDisadvantages: ‐noaerosols; aerosoleffectcapable
‐fixedCO2onle; varyingCO2capable‐fixedsfcemis; varyingemiscapable‐randomcldovlp; max‐randomoverlap‐largererrors; improvedaccuracyespatupperstrat, atupperstratosphere‐simplecldoptprop; advancedcldoptprop
CFSRDataandDocumenta)on
• CFSRSite:hPp://cfs.ncep.noaa.gov/cfsr• NOAAOperaIonalModelArchiveDistribuIonSystem(Nomad5)hPp://nomad5.ncdc.noaa.gov
• 33RadiaIon‐Cloudvariables(107total,MonthlyPGB06)
• Sahaetal.2010‐>BAMS
ComparisonwithCERES‐ERBE
• CERES:– TOA:EBAF,1x1,Jul2000‐Jun2005– SFC:SARB,sameperiodasTOA,fromDaveR.
• CFSR:0.5x0.5,Monthly,Re‐gridto360x180from720x361
• ERBE:Tropics20NSTOAOLR/RSW,byTakW.
GlobalTOAOLR
CFSR
CERES
Clear‐Sky
All‐Sky
GlobalTOARSW
CFSR
CERES
All‐Sky
Clear‐Sky
GlobalAnnual*Means
TOA OLR
TOA CS OLR
TOA RSW
TOA CSRSW SFC SW DN
SFC SW UP
SFC LW DN
SFC LW UP
Jul00‐Jun05 CFSR 228.1 248.2 101.8 65.2 167.6 36.9 304.2 356.4
CERES (EBAF/SARB) 224.1 249.7 102.7 61.7 165.7 32.9 304.7 354.7
Diff (RMSD) 4.1(6.74) -1.5(6.12) -0.9(16.30) 3.5(10.54) 1.9(18.02) 4.0(9.05) -0.5(10.3) 1.6(10.14)
Spatial Correlatn 0.9 0.87 0.72 0.88 0.76 0.91 0.92 0.92
Jan85‐Dec86 R1 237.1 267.8 115.3 54.9 207.5 333
ERBE 234 266.7 102.7 53.1 184 349.5
Dif 3.1 1.7 12.6 1.8 23.5 -16.5
SurfaceDownward&UpwardShortwave
CFSRCERES
SurfaceDownward&UpwardLongwave
CFSRCERES
Remarks
• CFSR1979~2009DataAvailable.• VerygoodSWimprovementsfromR‐1/R‐2,bothTOAandSFC,inlargerscales
• LWslightlessaccuratethanR‐1.FewerCloudsingeneralforstrongerCSOLR.differenceinW.TropicalPacific;OverStratusoffW.Coasts.Verygoodinanomalies
• StratosphericAerosolinputfilemis‐matchforMt.PinatuboStratosphericERBcomputa8on.
• SurfaceLW/,60degice‐snowmodelaffectERB,BrighterSFCAlbedo
BackUpSlides
ThisImeseriesoftheoutgoinglongwaveradiaIonfromtheNCEP/ClimateForecastSystemReanalysisprojectmanifeststhecomplexityoftheearthsystem.TheregularseasonalityisoverlapstheENSOandsubtleinter‐decadalvariaIonswithoccasionallargeinter‐seasonalvariaIons.Thisproductalsoreflectsthecross‐culngcollaboraIonsamongtheexpertsofsurfaceobservaIons,satellite,modeling,assimilaIon,andclimateanalystsfromSTAR.CPC.EMCandJCSDA.Theproductishighlyvaluableforassessingtropicalhazard,intra–seasonalvariability,ElNinoevoluIons,aswellasmodelandretrievalsystembiasesthatareessenIalforNOAAMissions.
• Satoetal.1993• Sato,Mki.,J.E.Hansen,M.P.McCormick,andJ.B.Pollack,
1993:Stratosphericaerosolop8caldepths,1850‐1990.J.Geophys.Res.,98,22987‐22994,doi:10.1029/93JD02553.
• Aglobalstratosphericaerosoldatabaseemployedforclimatesimula8onsisdescribed.Fortheperiod1883‐1990,aerosolop8caldepthsarees8matedfromop8calex8nc8ondata,whosequalityincreaseswith8meoverthatperiod.Fortheperiod1850‐1882,aerosolop8caldepthsaremorecrudelyes8matedfromvolcanologicalevidenceforthevolumeofejectafrommajorknownvolcanoes.ThedatasetisavailableoverInternet.