Statistics – Computation
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984maph...14...27z&link_type=abstract
In International Council of Scientific Unions Middle Atmosphere Program: Handbook for MAP. Vol. 14 p 27-35 (SEE N85-32466 21-4
Statistics
Computation
Atmospheric Circulation, Atmospheric Models, Mesosphere, Numerical Analysis, Planetary Waves, Stratosphere, Troposphere, Baroclinic Instability, Computation, Eigenvalues, Eigenvectors, Spherical Coordinates, Summer, Vertical Motion, Winter
Scientific paper
The structure of unstable planetary waves is computed by a quasi-geostrophic model extending from the surface up to 80 km by means of eigenvalue-eigenfunction techniques in spherical coordinates. Three kinds of unstable modes of distinct phase speeds and vertical structures are identified in the winter climate state: (1) the deep Green mode with its maximum amplitude in the stratosphere; (2) the deep Charney mode with its maximum amplitude in the troposphere: and (3) the shallow Charney mode which is largely confined to the troposphere. Both the Green mode and the deep Charney mode are characterized by very slow phase speeds. They are mainly supported by upward wave energy fluxes, but the local baroclinic energy conversion within the stratosphere also contributes in supporting these deep modes. The mesosphere and the troposphere are dynamically independent in the summer season decoupled by the deep stratospheric easterly. The summer mesosphere supports the easterly unstable waves 1-4. Waves 3 and 4 are identified with the observed mesospheric 2-day wave and 1.7-day wave, respectively.
Sasamori Takashi
Zhang K. S.
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