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Tidal Characteristics from the Extended Canadian Middle Atmosphere Model and Comparisons with CAWSES Tidal Campaign Results

W.E. Ward1, J. Du1, D.Y Wang1, and the CAWSES Tidal Campaign Team2
  1. University of New Brunswick, Fredericton, Canada
  2. The CAWSES Tidal Campaign Team: W.E. Ward, Dept. of Physics, University of New Brunswick, Canada; M. Gerding Leibniz-Institute of Atmospheric Physics, Kuhlungsborn, Germany; L. Goncharenko MIT Haystack Observatory, Route 40, Westford, MA 01886 USA; P. Keckhut Service d’Aéronomie, Institut Pierre et Simon Laplace, Verrière-le-Buisson, France; D. Marsh Atmospheric Chemistry Division, NCAR, P.O. Box 3000, Boulder, Colorado 80307-3000, USA; T. Nakamura, RISH, Kyoto University, Uji, Japan; J. Oberheide Physics Department, University of Wuppertal, Wuppertal, Germany; J. Scheer Instituto de Astronomía y Física del Espacio, Consejo de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Buenos Aires, Argentina; W. Singer Leibniz-Institute of Atmospheric Physics, Kuhlungsborn, Germany; N. Grieger, Leibniz-Institute of Atmospheric Physics, Kuhlungsborn, Germany; S. Gurubaran, Indian Institute of Geomagnetism, EGRL,Tirunelveli, India; H. Takahashi, INPE, CP-515, 12245-970 Sao Jose dos Campos, SP, Brasil, P. Hoffmann, Institute of Atmospheric Physics, Germany; L. Chang, University of Colorado, USA; A. Haefele, University of Bern, Switzerland; C.-Y. She, Colorado State University, USA; T. Yuan, Colorado State University, USA

The CAWSES Global Tidal Campaigns have provided an opportunity to compare satellite and ground based observations and model results for specific observations periods. Inclusion of non-migrating modes in this comparison, results in striking agreement between the tidal signatures from these various sources. Significant variations in ground station diurnal amplitudes along the same latitude circle appear to be the result of interference between various components. Tides analysed from the extended Canadian Middle Atmosphere Model (CMAM) also show this modulation, although shifted in longitude. There are consequences for constituent transport, airglow variations and chemical heating associated with this modulation. These consequences are discussed using output from the extended CMAM. With reasonable agreement being observed in the wind and temperature fields, the next challenge for the campaign is to determine whether this agreement extends to quantities such as these.

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