Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.a13i0400d&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #A13I-0400
Other
[3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves
Scientific paper
Wind and temperatures have been used to measured in the polar mesosphere and lower thermosphere using meteor radars over Esrange in the Arctic (68N, 21E) and Rothera in the Antarctic (68S, 68W). Data are available from 1999 for Esrange and 2005 for Rothera. The data are used to investigate the seasonal and inter-annual variability of the 5- and 16- day planetary waves. Strong 5-day wave activity is seen in winter and late summer. However, there is a high degree of inter-annual variability and in some individual years wave activity is almost absent. The data are used to construct a representative climatology for the Arctic and Antarctic. The seasonal cycle of the 5-day wave is found to be very similar in both polar regions. Wave activity in winter is present across the entire height range observed. Winter-time wave variance can reach about 65 m2/s2. The wave is largely absent around the equinoxes. Wave activity is also very strong in late summer, reaching about 75 m2/s2, but occurs only for 1 to 2 months and is confined to heights above about 90 km and excluded from the stronger westward winds at lower heights. Summer-time wave activity peaks at a height of about 95 km and decays rapidly above and below that height. During this summer maximum, the wave cannot have ascended to the mesosphere and lower thermosphere from below and so must have either been generated in situ and/or been ducted across the equator from the winter hemisphere. The seasonal cycle of the 5-day wave is remarkably similar to that observed for the 2-day wave at these latitudes. The 16-day wave also displays a clear seasonal cycle with strong inter-annual variability. Wave amplitudes and variances are generally smaller than those of the 5-day wave. There is only a small amount of wave activity in summer. The data sets are used to characterize the similarities and differences in the planetary waves of the Arctic and Antarctic in the mesosphere and lower thermosphere.
Day K. A.
Mitchell Nick J.
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