ROSE 3D Chemistry-Transport Model
DLR Version - Model Description
Semi-Lagrange transport driven by daily UKMO wind fields (Smolarkiewicz, 1995).
Gas-phase chemistry is based on the family-concept as formulated by Rose and Brasseur, 1989 (revised 1996). Reaction rates are calculated using daily temperature fields from UKMO and pre-calculated photolysis frequencies depending on local insolation and ozone column. Differential equations are solved by a semi-implicit scheme.
Sequential assimilation of level 2 trace gas concentrations
at the moment only GOME ozone columns planned:
Differences between ROSE/DLR and NCAR-ROSE
GOME ozone columns are assimilated sequentially using optimal interpolation to model-grid into the ROSE/DLR version:
A factor between the internal model ozone column and the incoming GOME total ozone measurement is derived and applied as a constant factor to the modelled ozone concentration at all vertical levels.
ROSE/DLR version 2.4 contains an empirical correction
to cope with observed altitude dependent systematic deviations between model
and measurements. ROSE/DLR ozone profiles (with assimilated GOME measurements)
vary systematically if compared with satellite and sonde measurements (see validation
The horizontal resolution is set to a fixed value. Modifications are necessary for an operational use in the DLR-DFD environment. A more flexible controlling of model runs through parameter files and a different output scheme is necessary.
Information about the original NCAR-ROSE model version can be found on the NCAR website http://www.ncar.ucar.edu/ncar.
Papers on ROSE
Brasseur G., K. Rose, C. M. Smythe, The behavior of ozone and other trace gases in the statosphere during dynamically perturbed situations: A three-dimensional model, Ozone in the Atmosphere, R. D. Bojkov, P. Fabian (Eds.), DEEPAK Publishing, 1989, ISBN 0-937194-15-8
Riese, M., X. Tie, G. Brasseur and D. Offermann, Three-dimensional simulation of stratospheric trace gas distributions measured by CRISTA, J. Geophys. Res., 104, 16419-16435, 1999
Smolarkiewicz, P.K. and P.J. Rasch, Monotone advection on the sphere: An Eulerian versus Semi-Lagrangian approach, J. Geophys. Res., 100, 1253-1269, 1995
Please send questions, comments, ideas or criticism to Frank Baier (DLR-DFD).