Tidal Variability in a Whole Atmosphere Model (WAM): Comparison With SABER Observations on TIMED

Details Tidal Variability in a Whole Atmosphere Model (WAM): Comparison With SABER Observations on TIMED Tidal Variability in a Whole Atmosphere Model (WAM): Comparison With SABER Observations on TIMED

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0288a&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0288

Mathematics

Logic

2427 Ionosphere/Atmosphere Interactions (0335), 2447 Modeling And Forecasting, 3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves

Scientific paper

The upper atmosphere and ionosphere exhibit spatial and temporal variability characteristic of planetary waves and tides originating in the lower atmosphere. To study the origin, vertical propagation, and possible effects of these planetary-scale perturbations on the coupled thermosphere-ionosphere-electrodynamics system, a new model of Integrated Dynamics through Earth's Atmosphere (IDEA) is being developed under a NASA sponsored collaborative project between the University of Colorado and National Weather Service's (NWS) Environmental Modeling and Space Environment Centers. The neutral-atmosphere component of the coupled system, WAM, is a 150-layer general circulation model based on NWS's operational weather prediction Global Forecast System (GFS), extended from its nominal top altitude of about 60 km to over 600 km. WAM incorporates relevant physical processes in the extended domain, ranging from the hydrological cycle, cloud physics, and atmosphere-surface exchanges in the troposphere, to solar and Joule heating, ion drag, and mutual diffusion of major species in the thermosphere. First extended simulations reveal the presence of various tidal waves modulated at planetary wave periods in the mesosphere and lower thermosphere (MLT). Substantial contribution from non-migrating tidal modes, recently implicated in the observed spatial morphology of the ionosphere, is also evident. Comparisons with a recent analysis of multi-year MLT observations by the SABER instrument on TIMED will be presented.

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