On the origin of mesospheric bores
| Autor: | R. H. Picard, E. M. Dewan |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Atmospheric Science
Ecology Meteorology Gravitational wave Airglow Paleontology Soil Science Forestry Inversion (meteorology) Geophysics Aquatic Science Oceanography Mesosphere Troposphere Undular bore Space and Planetary Science Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Mean flow Gravity wave Geology Earth-Surface Processes Water Science and Technology |
| Zdroj: | Journal of Geophysical Research: Atmospheres. 106:2921-2927 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/2000jd900697 |
| Popis: | A dramatic front of airglow radiance and wave structure reported by Taylor et al. 1995 was attributed, in a previous paper of ours Dewan and Picard, 1998, to a manifestation of an internal undular bore in the mesosphere. In the current paper we address the question of what physical process could be responsible for generating such a bore at that altitude. While it is relatively easy to find sources of internal tropospheric bores, including the dramatic "morning glory," the same cannot be said for mesospheric bores. It will be argued here that a likely candidate for the generator of such bores is the interaction of gravity waves with the mean flow at a critical layer. This interaction could take place within an already existing inversion layer, the latter playing the role of the "channel" in which the bore propagates. As Huang et al 1998 have shown, a similar wave/critical-level interaction may be responsible for the inversion layer in question. Hence we are proposing that the physical process producing the channel is the same as the one responsible for subsequently generating the bore. |
| Databáze: | OpenAIRE |
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