Computer Science
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986thdy.work...97g&link_type=abstract
In NASA. Goddard Space Flight Center Thermosphere Dynamics Workshop, Volume 2 p 97-103 (SEE N86-29301 20-42)
Computer Science
Atmospheric Chemistry, Atmospheric Composition, Gravity Waves, Mesosphere, Thermosphere, Atmospheric Circulation, Meridional Flow, Oxygen Atoms, Ozone, Parameterization, Periodic Variations, Trace Contaminants, Turbulent Diffusion, Two Dimensional Models
Scientific paper
The influence of breaking gravity waves on the dynamics and chemical composition of the 60 to 110 km region is investigated with a two dimensional model that includes a parameterization of gravity wave momentum deposition and diffusion. The dynamical model is described by Garcia and Solomon (1983) and Solomon and Garcia (1983) and includes a complete chemical scheme for the mesosphere and lower thermosphere. The parameterization of Lindzen (1981) is used to calculate the momentum deposited and the turbulent diffusion produced by the gravity waves. It is found that wave momentum deposition drives a very vigorous mean meridional circulation, produces a very cold summer mesopause and reverse the zonal wind jets above about 85 km. The seasonal variation of the turbulent diffusion coefficient is consistent with the behavior of mesospheric turbulences inferred from MST radar echoes. The large degree of consistency between model results and various types of dynamical and chemical data supports very strongly the hypothesis that breaking gravity waves play a major role in determining the zonally-averaged dynamical and chemical structure of the 60 to 110 km region of the atmosphere.
Garcia Rafael
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