Modelling the UTLS Region with a Comprehensive Multi-scale CTM and Using Data Assimilation
MOCAGE is the new atmospheric chemistry model of Météo-France. Among the model features is the possibility to consider both the troposphere and lower stratosphere, as well as to treat several levels of nested domains. A comparison of a model simulation with MOZAIC observations shows a good agreement between the two. However, in order to further improve the realism of the simulations, data assimilation can be employed. We show that a non-local technique brings an improvement in the model that lasts for over four days, the time needed to have an almost global coverage with MOZAIC. This opens the possibility of conducting long model simulations, typically of the order of one year, with a realistic Upper Troposphere — Lower Stratosphere region.
KeywordsData Assimilation Horizontal Resolution Nest Domain Data Assimilation Technique Tropospheric Chemistry
Unable to display preview. Download preview PDF.
- (Bechtold et al., 2000)Bechtold, P., J.-L. Redelsperger, I. Beau, M. Blackburn, S. Brinkop, J.-Y. Grandpeix, A. Grant, D. Gregory, F. Guichard, C. Hoff and E. Ioannidou: A GCSS model intercomparison for a tropical squall line observed during TOGA-COARE, II: intercomparison of single-column models and a cloud-resolving model, Q.J.R. Meteorol. Soc, 126, 865–888, 2000.CrossRefGoogle Scholar
- (Law et al., 2000)Law, K.S., P.-H. Plantevin, V. Thouret, A. Marenco, W.A.H. Asman, M. Lawrence, P.J. Crutzen, J.-F. Müller, D. Hauglustaine and M. Kannakidou: Comparison between global Chemistry-Transport Models results and measurements of ozone and water vapour by Airbus in-service aircraft (MOZAIC) data. J. Geophys. Res., 2000.Google Scholar
- (Plantevin, 2000).Plantevin, P.-H., The oxydizing capacity of the troposphere, PhD thesis, University of Cambridge, PhD. 23417, 2000.Google Scholar
- (Peuch et al. 2000)Peuch, V.-H., M. Amodei, T. Barthet, M-L. Cathala, B. Josse, M. Michou and P. Simon, MOCAGE: Modèle de Chimie Atmosphérique à Grande Echelle, Actes des Ateliers de Modélisation de l’Atmosphère 1999, 33–36, Météo-France, Centre National de Recherches Météorologiques, 1999.Google Scholar
- (Marenco et al., 1998)Marenco, A., V. Thouret, P. Nédélec, H. Smit, M. Helten, D. Kley, F. Karcher, P. Simon, K.S. Law, J.A. Pyle, G. Poschmann, R. Von Wedre, C. Hume and T. Cook: Measurements of ozone and water vapour by Airbus in-service aircraft: the MOZAIC airborne program. J. Geophys. Res., 103, 25631–25642, 1998.CrossRefGoogle Scholar
- (WMO, 1998).World Meteorological Organization: Scientific assessment of ozone depletion, 1998, Global Ozone Research and Monitoring Project — Report No 44, 1998.Google Scholar
- (Stockwell et al., 1997)
- (IPCC, 1995).Intergovernmental Panel on Climate Change, Climate change 1994: radiative forcing of climate change and an evaluation of the IPCC IS92 emissions scenarios, Cambridge University Press, Cambridge, U.K., 1995.Google Scholar
- (Lefèvre et al., 1994)
- (Lary et al., 1995)Lary, D.J., Chipperfïeld, M.P., Pyle, J.A., Norton, W.A. and Riishogaard, L.P.: Three-dimensional tracer initialization and general diagnostics using equivalent PV latitude-potentiel-temperature coordinates, Q. J.R. Meteorol. Soc, 121, 187–210, 1995.Google Scholar
- (Brasseur and Solomon, 1986).
- (Cressman, 1959).