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Middle atmosphere simulations with the ECHAM4 model: Sensitivity to the Doppler spread gravity wave parameterization

MPG-Autoren
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Manzini,  Elisa       
MPI for Meteorology, Max Planck Society;

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Manzini, E., McFarlane, N. A., & McLandress, C. (1997). Middle atmosphere simulations with the ECHAM4 model: Sensitivity to the Doppler spread gravity wave parameterization. In K. Hamilton (Ed.), Gravity Wave Processes: Their Parameterization in Global Climate Models. (pp. 367-381). Berlin: Springer.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002E-28D8-E
Zusammenfassung
The response of a general circulation model to the Hines Doppler spread parameterization of gravity wave momentum deposition is described. Two simulations were carried out using different specifications of the gravity wave rms wind speed at the tropopause. In the first simulation the rms wind speed is a function of the simulated precipitation. In the second a constant rms wind speed is used. For both simulations a realistic seasonal cycle of the zonal mean circulation is obtained. In particular, the simulated October circulation is considerably improved over previous results obtained using Rayleigh friction in the mesosphere. The major differences between the two simulations occur in the tropical middle atmosphere and in the austral autumn.