Evaluation of dynamical parameters with a three-dimensional mechanistic model of the middle atmosphere
Journal Article
·
· Journal of Geophysical Research
- Institut fuer Meteorologie und Klimaforschung, Karlsruhe (Germany)
A three-dimensional model of the middle atmosphere is introduced. The model is based on the full set of the primitive equations. It is designed to simulate a yearly cycle of the middle atmosphere. Results are presented for the solstice and equinox conditions. The model reproduces the main observed features of the middle atmospheric circulation: the stratospheric-mesospheric jet streams and the cold summer mesopause region at solstice with reversed zonal wind especially in the summer mesosphere, and the weak westerly circulation at equinox. The parameterized effects of breaking gravity waves in the mesosphere drive the atmosphere out of radiative balance. They lead to a meridional circulation with a one-cell structure at solstice with upward (downward) motion over the summer (winter) pole and a meridional flow towards the winter hemisphere and a two-cell structure at equinox with upward motion over the tropics and downward motion over the polar regions. Potential fields are presented for horizontal vector fields. They suggest that the stratospheric circulation can is dominated by horizontally nondivergent flow. This is modified by the results of a more quantitative view at the interaction of planetary waves on the zonal mean flow, which clearly identifies the essential role of horizontal divergence on the stratospheric circulation.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 85495
- Journal Information:
- Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: D12 Vol. 98; ISSN JGREA2; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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