Computer Science – Sound
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3523810k&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 23, CiteID L23810
Computer Science
Sound
7
Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Polar Meteorology, Atmospheric Processes: Mesospheric Dynamics
Scientific paper
Two VHF atmospheric radars operating in Antarctica during austral summer 2007/2008 found the Polar Mesosphere Summer Echo (PMSE) layer at 3-5 km higher altitude during the early season, compared to the late season, and to earlier seasons. Temperatures from the microwave limb sounder on the Aura satellite show that the height of the cold summer mesopause was ~3 km higher than usual at the same time. The winter polar vortex over Antarctica did not break up until late December, so that eastward winds in the lower stratosphere were as strong as westward winds in the upper stratosphere during the early part of the austral summer. We find that a combination of limited gravity wave forcing from below in the same hemisphere and interhemisphere coupling between the winter stratosphere/mesosphere and the summer mesopause may explain the observations, and suggest a need for reappraisal of the formation mechanisms for the summer mesopause.
Holdsworth David A.
Kirkwood Sheila
Klekociuk Andrew R.
Mitchell Nick J.
Morris James R.
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