简介:Thedynamicalframeworkofthenine-levelversionoftheIAPAGCMispresentedinthispaper.Theemphasisofthemodel’sdescriptionisputonthefollowingtwoaspects:(1)Amodel’sstandardatmosphere,whichisasatisfactoryapproximationtotheobservedtroposphereandlowerstratospherestandardatmosphere,isintroducedintotheequationsofthemodeltopermitamoreaccuratecalculationoftheverticaltransportterms,especiallynearthetropopause;(2)Theverticallevelsofthemodelarecarefullyselectedtoguaranteeasmoothdependenceoflayerthicknessuponpressureinordertoreducethetruncationerrorinvolvedintheunequalintervalverticalfinite-differencing.Fortestingthemodel,twokindsoflinearbaroclinicRossby-Haurwitzwaves,oneofwhichhasadynamicallystableverticalstructureandtheotherhasarelativelyunstableone,areconstructedtoprovideinitialconditionsfornumericalexperiments.Thetwowaveshavebeenintegratedformorethan300daysand100daysre