Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa22a10l&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA22A-10
Physics
3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342), 3384 Waves And Tides
Scientific paper
An event featuring a large temperature increase of ~50 K in the amplitude of a mesosphere inversion layer (MIL) located near 65 km altitude was observed by a Rayleigh/Na temperature lidar operating from the Urbana Atmospheric Observatory (40.1 N, 88.1 W) on November 17, 1997. The temperature structure between 30 and 70 km was found to be coherent with a vertical wavelength of about 12.3 km and a downward phase progression with a period of about 12.6 hours, suggesting an inertial gravity wave moving with a horizontal phase speed of ~60 m/s. Initial analysis indicates that this large amplitude wave may become unstable and break between 60-70 km. A numerical experiment is conducted using a two dimensional gravity wave model and wave characteristics suggested by the observations to study the inertial-gravity wave breaking process. Comparisons of temperature changes between the numerical experiment and the observations will be presented, and the possible modulation of these temperature changes due to the thermal tidal components will be discussed. Large amplitude inertial gravity waves and/or their breaking may be a possible cause of some MIL events.
Hagan Maura E.
Liu Hongya
Meriwether W. Jr. J.
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