Models used are global scale and cover the atmosphere from the ground to the thermosphere. Gravity wave parameterisation is included, and planetary waves are forced included through direct forcing at the lower boundary, or through assimilation of global datasets in the troposphere/stratosphere.
Simulations are performed with the COMMA-LIM model and the MUAM (Middle and Upper Atmosphere) Model in cooperation with Russian State Hydrometeorological University, St. Petersburg.
Numerical model research includes support for empirical models of the middel atmosphere, propagation of planetary waves to the mesosphere/thermosphere, gravity wave-mean flow and gravity wave-planetary wave interaction, analysis of middle atmosphere long-term trends, effect of solar variability on the middle atmosphere.
Selected Publications:
Jacobi, Ch., K. Fröhlich, Y. Portnyagin, E. Merzlyakov, T. Solovjova, N. Makarov, D. Rees A. Fahrutdinova, V. Guryanov, D. Fedorov, D. Korotyshkin, J. Forbes, A. Pogoreltsev, and D. Kürschner, 2008: Semi-empirical model of middle atmosphere wind from the ground to the lower thermosphere. Adv. Space Res., 43,239-246.
Pogoreltsev, A.I., A.A. Vlasov. K. Fröhlich, and Ch. Jacobi, 2007: Planetary waves in coupling the lower and upper atmosphere. J. Atmos. Solar-Terr. Phys. 69, 2083-2101.
Fröhlich, K., T. Schmidt, M. Ern, P. Preusse, A. de la Torre, J. Wickert, and Ch. Jacobi, 2007: The global distribution of gravity wave energy in the lower stratosphere derived from GPS data and gravity wave modelling: attempt and challenges. J. Atmos. Solar-Terr. Phys. 69, 2238–2248.
Jacobi, Ch., N. Jakowski, A. Pogoreltsev, K. Fröhlich, P. Hoffmann, and C. Borries, 2007: The CPW-TEC project: Planetary waves in the middle atmosphere and ionosphere. Adv. Radio Sci. 5, 393–397.
Fröhlich, K., A. I. Pogoreltsev, Ch. Jacobi and L.A. Nechaeva, 2007: The influence of NCEP-data assimilated into COMMA-LIM on the 16-day wave. Wiss. Mitt. Inst. Meteorol. Univ. Leipzig 41, 37-45. (pdf)
Jacobi, Ch., A.I. Pogoreltsev, and K. Fröhlich, 2006: Middle atmosphere background climatology from a simple circulation model. Adv. Space Res., 38, 2470-2474.
Jacobi, Ch., K. Fröhlich, and A. Pogoreltsev, 2006: Quasi two-day-wave modulation of gravity wave flux and consequences for the planetary wave propagation in a simple circulation model. J. Atmos. Solar-Terr. Phys., 68, 283-292.
Fröhlich, K., Ch. Jacobi, und A.I. Pogoreltsev, 2005: Planetary wave transience effects on the zonal mean flow. Adv. Space Res., 35, 1900-1904.
Jacobi, Ch., M. Lange and D. Kürschner, 2003: Influence of anthropogenic climate gas changes on the summer mesospheric/lower thermospheric meridional wind. Meteorol. Z., N.F. 12, 37-42.
Zonal mean zonal winds as simulated with COMMA-LIM
Zonal mean meridional winds as simulated with COMMA-LIM