摘要
UsingtheECMWFreanalysisdaily200-hPawinddataduringthetwo20-yrperiodsfrom1958to1977andfrom1980to1999,thecharacteristicsandchangesofIntraseasonalOscillations(ISO)inthetwoperiodsassociatedwithglobalwarmingareanalyzedandcomparedinthisstudy.Itisfoundthatduringthelast20years,theISOhasweakenedinthecentralequatorialPacificOcean,butbecomesmoreactiveinthecentralIndianOceanandtheBayofBengal;underthebackgroundoftheglobalwarming,increaseintheamplitudeofISOintensitysuggeststhattheISOhasbecomemoreactivethanbefore,withanobviousseasonalcycle,i.e.,strongduringwinterandspring,butweakduringsummerandautumn;theenergyoftheuppertroposphericzonalwindshasmoreconcentratedinwavenumbers1-3,andthefrequencyofISOtendedtoincrease.ComparisonbetweentheresultsofcontrolexperimentandCO_2increase(1%peryear)experimentofFGOALS-1.0g(developedatLASG)withthefirstandsecond20-yrobservations,isalsoperformed.respectively.ThecomparativeresultsshowthatthespatialstructureoftheISOwaswellreproduced,butthestrengthofISOwasunderestimated.Onthebasisofspace-timespectralanalysis,itisfoundthatthesimulatedISOcontainstoomuchhighfrequencywaves,leadingtotheunderestimationofISOintensityduetothedispersionofISOenergy.However,FGOALS-1.0gcapturedthesalientfeaturesofISOundertheglobalwarmingbackgroundbytwocontrastexperiments,suchasthevitalityandfrequency-increasingofISOinthecentralIndianOceanandtheBayofBengal.
出版日期
2007年04月14日（中国期刊网平台首次上网日期，不代表论文的发表时间）
