Stratospheric disturbance effects upon the mesosphere thermal structure for late November, 1997

Details Stratospheric disturbance effects upon the mesosphere thermal structure for late November, 1997 Stratospheric disturbance effects upon the mesosphere thermal structure for late November, 1997

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa51b..11m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA51B-11

Other

0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 3334 Middle Atmosphere Dynamics (0341, 0342), 3379 Turbulence, 3384 Waves And Tides, 3394 Instruments And Techniques

Scientific paper

Combined Rayleigh and sodium temperature lidar measurements were obtained at the University of Illinois Urbana Atmospheric Observatory (40.1N, 88.1 W) during a frontal disturbance in the upper troposphere and lower stratosphere that took place between 12 November and 19 November, 1997 while moving from the western part of the North American continent to the midwest. These observations were made on the 12th, 17th, 18th, and 19th during the nighttime hours with additional measurements obtained by the sodium temperature system during the day on the 17th. Vertical wind measurements within the peak of the sodium layer near 92 km were also made. The results for the 17th and the 19th showed large mesospheric inversion layers (MILs) near 65 km with amplitudes of 50 to 80 oK while the results for the 12th and the 18th were more typical of the background thermal structure. The mesopause region from 80 to 105 km showed a very strong semi-diurnal tide for the 17 Nov data with amplitudes of ~40 oK but the other nights showed that the amplitude of this tidal mode varied from 10 to 30 oK. Vertical wind variations with amplitudes of 1 to 3 ms-1 were observed for the two disturbed nights. The observations indicated wave structures with an apparent period of 12 hours and a vertical wavelength of 12 km following the development of strongly ageostrophic flow in the lower stratosphere for the 17th. Midway through this night it appeared that the MIL amplitude increased by ~50oK suggesting that this wave had experienced wave breaking with consequent development of altitude bands of heating and cooling. This example of substantive disturbances observed in the upper stratosphere and mesopause regions in the wake of this frontal system suggests that such tropospheric frontal disturbances may have strong effects upon the overlying layers of the atmosphere through the coupling generated by the propagation of long-period waves into the upper atmosphere.

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