the radiaon fluxes of ncep/climate forecast system ... · sw radiaon vs. cfsrr rrtm sw radiaon...

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.