polarstratosphericcloudsubmodelhasbeendevelopedandincorporatedinageneralcirculationmodelincludingatmosphericchemistry(ECHAM5/-MESSy). Theformationandsedimentationofpolarstratosphericcloud(PSC)particlescanthusbesimulatedaswellasheterogeneouschemicalreactionsthattakeplaceonthePSCparticles. ForsolidPSCparticlesedimentation, theneedforatailor-madealgorithmhasbeenelucidated. Asedimentationschemebasedon
