A study of vertical evolution of Mesosphere and lower thermosphere temperature anomalies during the 2002 Southern Hemisphere Stratospheric Warming Event

Details A study of vertical evolution of Mesosphere and lower thermosphere temperature anomalies during the 2002 Southern Hemisphere Stratospheric Warming Event A study of vertical evolution of Mesosphere and lower thermosphere temperature anomalies during the 2002 Southern Hemisphere Stratospheric Warming Event

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa53a1237a&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA53A-1237

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

Kinetic temperatures, inferred from the thermalized OH (6,2) and O2 At(0,1) rotational distribution measurements at South Pole (90o S), are presented here to investigate the effects of the 2002 Sudden Stratospheric Warming (SSW) event on the polar mesosphere and lower thermosphere region (MLT). These measurements show sudden cooling in OH temperatures and warming in O2 temperatures preceding the two minor stratospheric warming events studied here. These large temperature anomalies in the MLT temperatures preceded the breakdown in the polar vortex by about three to four weeks. These results agree with the findings of Coy et al. [2005] about the limited vertical extent of the mesospheric cooling signature, albeit the model cooling being limited to within the lower mesosphere. Planetary wave activity in the OH and O2 rotational temperature data shows intensification in the amplitudes of 5-15 day period waves during the polar vortex break down.

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