Implementing a nonlinear gravity wave (GW) parameterization into a mechanistic middle
and upper atmosphere model, which extends to the lower thermosphere (160 km), we
study the response of the atmosphere in terms of the circulation patterns, temperature
distribution, and migrating terdiurnal solar tide activity to the upward propagating small scale internal GWs originating in the lower atmosphere. We perform three test simulations
for the Northern Hemisphere winter conditions in order to assess the effects of variations in
the initial GW spectrum on the climatology and tidal patterns of the mesosphere and lower
thermosphere. We find that the overall strength of the source level momentum flux has a
relatively small impact on the zonal mean climatology. The tails of the GW source level
spectrum, however, are crucial for the lower thermosphere climatology. With respect to the
terdiurnal tide, we find a strong dependence of tidal amplitude on the induced GW drag,
generally being larger when GW drag is increased.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:84176 |
| Date | 21 March 2023 |
| Creators | Lilienthal, Friederike, Yiğit, Erdal, Samtleben, Nadja, Jacobi, Christoph |
| Publisher | Frontiers Research Foundation |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 2296-987X, 588956 |
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