Contributions of MPI C and MPI MIPS In May 2001 a first planning meeting

Contributions of mpi c and mpi mips in may 2001 a

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Contributions of MPI-C and MPI-MIPS In May 2001 a first planning meeting involving MPI-MIPS, MPI-C and IMK-KASIMA took place in Mainz. At this meeting Roland Ruhnke (IMK), who is a member of the AFO-2000 POSTA (Polar stratospheric aerosols)-project, introduced and explained the model of the ternary H 2 SO 4 /HNO 3 /H 2 O-solution and the polar stratospheric cloud-scheme which are used in the KASIMA model. These schemes are three-dimensional (3D) versions of the schemes basing on the Carslaw et al. (1995) and Waibel et al. (1999) models, respectively, originally developed at MPI-C. The group discussed the best way to implement the KASIMA version into ECHAM and the source code of the KASIMA ternary H 2 SO 4 /HNO 3 /H 2 O-solution- scheme has been forwarded to MPI-C in October. In contrast to KASIMA, which is using the aerosol surface density as observed by SAGE II to calculate the composition of the ternary solution, ECHAM is able to calculate the treatment and consideration of stratospheric sulphate aerosol and sulphuric acid vapour explicitely. At the next meeting, which is planned for January 2002, a detailed time schedule will be set up. Contribution of DLR: The definition of the so-called transient model simulations (1960-2000) with the coupled chemistry-climate models ECHAM4.L39(DLR)/CHEM and MAECHAM4/CHEM has been finished. For that purpose a workshop was organised at Oberpfaffenhofen (May 21 st and 22 nd , 2001) where group members of MPI-C and DLR discussed the conditions for the simulations. A protocol of the meeting can be found at the KODYACS web-page (see "intern"). It was agreed to do the simulations on the basis of the ECHAM4 model version, since the ECHAM5 version is currently not available (current status: December 31 st , 2001) and a changing to this model version after its release by the colleagues in Hamburg would take some time (i.e. coupling with chemistry, increase of model layers near the tropopause). If ECHAM5 will be released in short time, sensitivity experiments are planned based on this model version. In close co-operation with MPI-MAECHAM, MPI-C, and MPI-MIPS consistent and uniform data sets are being constructed, which will be needed for the transient simulations with both model versions, e.g. for sea surface temperatures, the distribution of stratospheric volcano aerosol, the zonal mean lower stratospheric winds in the tropics and subtropics (QBO; see WP6), the chemical conditions at the upper boundary of ECHAM4.L39(DLR)/CHEM. Therefore it was necessary to have detailed quests in literature. The transient boundary conditions for the source gases have been provided by the Mainz 2D-model. For stratospheric aerosol basically the time dependent WMO-2002 data set based on SAGE observations will be used, which is currently under development (Figure WP3-1 shows data of the WMO-1999 data set, which is slightly different). The data have to be extended for the episode back to 18
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1960. Currently, DLR, MPI-C, and MPI-MIPS are jointly working on a consistent extension of this data set. Moreover, the employed models ECHAM4.L39(DLR)/CHEM and
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