HR: 11:45h
AN: SA32A-06    [Abstracts]
TI: Troposphere-Thermosphere Planetary Wave Coupling During the 2002 Southern Hemisphere Pre-Stratwarm Period
AU: * Forbes, J M
EM: forbes@colorado.edu
AF: University of Colorado, Department of Aerospace Engineering Sciences UCB 429, Boulder, CO 80309 United States
AU: Palo, S E
EM: palo@colorado.edu
AF: University of Colorado, Department of Aerospace Engineering Sciences UCB 429, Boulder, CO 80309 United States
AU: Russell, J
EM: james.russell@hamptonu.edu
AF: Hampton University, Center for Atmospheric Sciences 23 Tyler Street, Hampton, VA 23668 United States
AU: Mertens, C J
EM: c.j.mertens@larc.nasa.gov
AF: NASA/Langley, Radiation and Aerosol Branch 21 Langley Boulevard, Hampton, VA 23681 United States
AU: Mlynczak, M
EM: m.g.mlynczak@larc.nasa.gov
AF: NASA/Langley, Radiation and Aerosol Branch 21 Langley Boulevard, Hampton, VA 23681 United States
AB: Measurements from the TIMED satellite afford a new perspective on tides and planetary waves in the mesosphere/lower thermosphere-ionosphere (MLTI) region (ca. 60-180 km). Herein, temperatures from 20-120 km from the SABER instrument on the TIMED satellite are used to diagnose vertical coupling by planetary waves during the 15 July - 20 September 2002 period just prior to the Southern Hemisphere stratosphere warming that occurred. The primary waves that existed during this period are the quasi-10-day eastward propagating waves with zonal wavenumbers s = 1 and s = 2 and the stationary planetary wave with s = 1. Amplitude structures of the former waves are characterized by five maxima of order 5-8 K between 25 km and 110 km altitude with 180-degree phase shifts in-between. The stationary planetary wave is characterized by westward phase progression with height. Coincidence of the rise in eastward-1 and stationary wave-1 amplitudes with decline in eastward-2 amplitudes is suggestive that the eastward-1 wave is generated via nonlinear interaction between the eastward-2 wave and the stationary wave. The relative phase structures of the waves, i.e., coincidence of the wave ridges with changes in wave amplitudes also provide insight into the wave-wave interactions that are occurring, and that also give rise to 10-day vascillation in the zonal mean temperatures.
DE: 3332 Mesospheric dynamics
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3369 Thermospheric dynamics (0358)
DE: 3389 Tides and planetary waves
SC: SPA-Aeronomy [SA]
MN: Fall Meeting 2005