Effect of Stochastic MJO Forcing on ENSO Predictability.pdf

Effect of Stochastic MJO Forcing on ENSO Predictability.pdf

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Effect of Stochastic MJO Forcing on ENSO Predictability

ADVANCESIN ATMOSPHERIC SCIENCES,VOL.28,NO.6,2011,1279—1290 EffectofStochasticM JO Forcingon ENSO Predictability PENGYuehua,,。(彭跃华),DUANWansuo (段晚锁),andXIANGJie。(项杰) TheStateKeyLaboratoryofNumericalModelingforAtmosphericSciencesandGeophysicalFluidDynamics, InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029 DepartmentofMilitaryOceanography,DalianNavalAcademy,Dalian116018 。InstituteofMeteorology,PLA UniversityofScienceandTechnology,Nanjing211101 (Received13January2011;revised1April2011) ABSTRACT W ithin theframeoftheZebiak—Canemode1.the impactoftheuncertaintiesoftheMadden Julian 0scillationfMJO1onENSOpredictabilitywasstudiedusingaparameterizedstochasticrepresentation0f intraseasonalforcing.Theresultsshow thattheuncertaintiesofMJO havelittleeffecton themaximum predictionerrorforENSOeventscausedbyconditionalnonlinearoptimalperturbationfCNOP);compared toCNOP—typeinitialerror.themodelerrorcausedbytheuncertaintiesofMJO ledtoasmallerprediction uncertaintyofENSO.anditsinfluenceovertheENSOpredictabilitywasnotsignificant.Thisresultsuggests thattheinitialerrormightbethemainerrorsourcethatproducesuncertainty in ENSO prediction,which couldprovideatheoreticalfoundationforthedataassimilationoftheENSO forecast. Keywords:MaddenJulianOscillation(MJO),ElNifio—SouthernOscillation(ENSO),conditionalnon— linearoptimalperturbation(CNOP),modelerror Citation:Peng,Y.H.,W .S.Duan,andJ.Xiang,2011:EffectofstochasticMJO forcingon ENSO predictability.Adv.Atmos.Sci.,2s(6)doi:10.1007/s00376—011—0126—4. 1. Introduction predictionleve1wasdependentontheinitialfieldpre— cisionofthenumeri

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