HR: 16:00h
AN: SA34A-01    [Abstracts]
TI: Nonmigrating Diurnal Tidal Variability in Mesopause Region Winds: TIDI, TIME-GCM and GSWM Comparisons
AU: Oberheide, J
EM: joberh@uni-wuppertal.de
AF: Physics Department Wuppertal University, Gauss Strasse 20, Wuppertal, D-42097 Germany
AU: * Hagan, M E
EM: hagan@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Wu, Q
EM: qwu@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Ortland, D A
EM: ortland@nwra.com
AF: NorthWest Research Associates, 14508 NE 20th Street, Bellevue, WA 98007-3713 United States
AU: Killeen, T L
EM: killeen@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Roble, R G
EM: roble@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Niciejewski, R
EM: niciejew@umich.edu
AF: University of Michigan, Space Physics Research Laboratory 2455 Hayward, Ann Arbor, MI 48109-2143 United States
AU: Skinner, W
EM: wskinner@umich.edu
AF: University of Michigan, Space Physics Research Laboratory 2455 Hayward, Ann Arbor, MI 48109-2143 United States
AB: We compare nonmigrating diurnal wind estimates determined from measurements made by the TIMED Doppler Inteferometer (TIDI) instrument on the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite with predictions from the NCAR Thermosphere-Ionosphere-Mesosphere-Electrodynamics General Circulation Model (TIME-GCM) and the Global-Scale Wave Model (GSWM). The models account for two different nonmigrating tidal sources. The GSWM includes tropospheric latent heat release associate with deep tropical convection, while the TIME-GCM includes nonlinear interactions between quasi-stationary planetary waves and migrating tides. The model and measurement comparisons suggest that both sources are important to the interpretation of the TIDI tidal winds. We contrast the true model tidal results with estimates that we determine from the subsets of model wind predictions that represent what TIDI would observe if it flew through the model atmospheres. These contrasts allow us to quantify the sampling issues associated determining tidal signatures from the slowly precessing TIMED TIDI satellite data.
DE: 3332 Mesospheric dynamics
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3384 Waves and tides
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting