Dynamical variations of the polar summer mesopause region and PMC occurrence

Details Dynamical variations of the polar summer mesopause region and PMC occurrence Dynamical variations of the polar summer mesopause region and PMC occurrence

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33c..01s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA33C-01

Physics

0300 Atmospheric Composition And Structure, 0320 Cloud Physics And Chemistry, 3334 Middle Atmosphere Dynamics (0341, 0342)

Scientific paper

Satellite observations of the variation of PMCs during the summer season have long shown PMC occurrence to be characterized by sharp variations whereby clouds appear and disappear on a global scale over timescales of only a few days [e.g. Bailey et al., SNOE observations of PMCs, J. Geophys. Res.,doi:10.1029/2004JD005422, 2005]. The first summer season of the AIM mission was no exception and this period offers an excellent opportunity to understand the link between mesospheric meteorology and global PMC occurrence. In 2007, clouds maximized near solstice but then sharply decreased by the end of June. This appears to be linked to an unexpected warming of the mesopause region. Clouds increased again in July but showed considerable variation for the rest of the summer season. The end of the summer season also happened abruptly. Over a several day period, mesopause temperatures jumped by 15K and the H2O dropped sharply. We examine these features using analyses and forecasts from the NOGAPS-ALPHA model. In some cases, changes in the filtering of gravity waves by the lower atmosphere appear to be linked to changes in mesopause weather. This might suggest a direct link between tropospheric weather and mesospheric weather. However, in other cases, a simple forecast using parameterized gravity wave forcing appears to be inadequate to explain the observations.

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