Physics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1867k&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 11, p. 1867-1870
Physics
20
Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Atmospheric Composition And Structure: Aerosols And Particles, Radio Science: Radar Atmospheric Physics, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry
Scientific paper
Factors determining the onset and decay of the Polar Mesosphere Summer Echo (PMSE) season in 1997 are examined. PMSE from the ESRAD radar at 68°N, 20°E are compared with simultaneous observations of stratospheric winds, upper-mesosphere temperature, upper mesosphere water vapour and noctilucent clouds. There was a 3-week delay from the start of summer, defined by temperature or stratospheric winds, to the start of PMSE. At the end of the summer, the return to winter conditions was simultaneous in all three parameters. Noctilucent clouds at 55-60°N were confined to the period of lowest temperatures, when PMSE were also present throughout the day. Water vapour observations show an increase during the summer, possibly taking place in late May, at about the time PMSE first appeared. It seems likely that the start of the PMSE season is determined by water vapour availability, while the end of the season is determined by temperature.
Barabash V.
Chilson Philip
Espy Patrick
Kirkwood Sheila
Réchou Anne
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