HR: 0800h
AN: SA41A-1038    [Abstracts]
TI: MLT cooling at Resolute Bay(74\deg N, 94\deg W), Canada
AU: * Cho, Y
EM: youngmin@stpl.cress.yorku.ca
AF: Centre for Research in Earth and Space Science, York University, Toronto, ON M3J 1P3 Canada
AU: Shepherd, G G
EM: gordon@yorku.ca
AF: Centre for Research in Earth and Space Science, York University, Toronto, ON M3J 1P3 Canada
AU: Won, Y
EM: won408@erau.edu
AF: Department of Physical Sciences, Embry-Riddle Aeronautical University 600 S. Clyde Morris Blvd., Daytona Beach, FL 32114 United States
AB: Observations of the MLT (Mesosphere and Lower Thermosphere) show a strong coupling to the stratosphere through adiabatic cooling and warming effects. This arises from energy and momentum input to the MLT by propagating waves from the lower atmosphere.The dynamical forcing causes upwelling in the mesosphere and downwelling in the stratosphere, giving rise to a stratospheric sudden warming. To explore this relationship an optical instrument called SATI (Spectral Airglow Temperature Imager) was installed at Resolute Bay (74\deg N, 94\deg W), November, 2001 and observations have been made for three winter seasons. The SATI measures emission rates and temperatures from the O$_2$(0$-$1) atmospheric band at an altitude of 94 km and from the OH(6$-$2) Meinel band nightglow at 87 km. The three winters were very different in the characteristics of their temperature perturbations. The strongest mesospheric coolings related to the stratospheric sudden warming (SSW) were found from 2001/2002 winter season data. These events were compared with the stratospheric assimilated data provided by UKMO (UK Meteorological Office) and the TIME-GCM$/$CCM3 (National Center for Atmospheric Research Thermosphere, Ionosphere, Mesosphere, and Electrodynamics General Circulation Model$/$Climate Community Model Version 3) predictions of Liu & Roble.
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 2475 Polar cap ionosphere
DE: 0310 Airglow and aurora
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting