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Variability of Gravity Wave Effects on the Zonal Mean Circulation and Migrating Terdiurnal Tide as Studied With the Middle and Upper Atmosphere Model (MUAM2019) Using a Nonlinear Gravity Wave Scheme

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  • Additional Information
    • Publisher Information:
      Frontiers Research Foundation 2020 2023-04-03
    • Abstract:
      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 smallscale 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 GWspectrum 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.
    • Subject Terms:
      gravity waves, middle atmosphere, general circulation model, vertical coupling, solar tide, gravity wave parameterization, lower thermosphere; info:eu-repo/classification/ddc/520; ddc:520; info:eu-repo/semantics/publishedVersion; doc-type:article; info:eu-repo/semantics/article; doc-type:Text
    • Availability:
      Open access content. Open access content
      info:eu-repo/semantics/openAccess
    • Note:
      English
    • Other Numbers:
      SUUSL oai:qucosa:de:qucosa:84540
      urn:nbn:de:bsz:15-qucosa2-845405
      1375409465
    • Contributing Source:
      STAATS U UNIV
      From OAIster®, provided by the OCLC Cooperative.
    • Accession Number:
      edsoai.on1375409465
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