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| Titel |
Planetary wave activity in the polar lower stratosphere |
| VerfasserIn |
S. P. Alexander, M. G. Shepherd |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 2 ; Nr. 10, no. 2 (2010-01-25), S.707-718 |
| Datensatznummer |
250007970
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| Publikation (Nr.) |
 copernicus.org/acp-10-707-2010.pdf |
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| Zusammenfassung |
| Temperature data from the COSMIC GPS-RO satellite constellation are used to
study the distribution and variability of planetary wave activity in the low
to mid- stratosphere (15–40 km) of the Arctic and Antarctic from
September 2006 until March 2009. Stationary waves are separated from
travelling waves and their amplitudes, periods and small-scale vertical
distribution then examined. COSMIC observed short lived (less than two weeks
and less than 5 km vertically) but large enhancements in planetary wave
amplitudes occurring regularly throughout all winters in both hemispheres. In
contrast to recent Arctic winters, eastward wave activity during 2008–2009
was significantly reduced during the early part of the winter and immediately
prior to the major SSW. The eastward waves which did exist had similar
periods to the two preceding winters (~16–20 days). A westward wave
with zonal wavenumber two, with distinct peaks at 22 km and 35 km and
period around 16–24 days, as well as a stationary wave two were associated
with the 2009 major SSW. In the Southern Hemisphere, the height structure of
planetary wave amplitudes also exhibited fluctuations on short time and
vertical scales superimposed upon the broader seasonal cycle. Significant
inter-annual variability in planetary wave amplitude and period are noticed,
with the times of cessation of significant activity also varying. |
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