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| Titel |
A gravity waves study close to the Andes mountains in Patagonia and Antarctica with GPS radio occultation observations |
| VerfasserIn |
P. Alexander, D. Luna, P. Llamedo, A. Torre |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 28, no. 2 ; Nr. 28, no. 2 (2010-02-19), S.587-595 |
| Datensatznummer |
250016786
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| Publikation (Nr.) |
 copernicus.org/angeo-28-587-2010.pdf |
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| Zusammenfassung |
| We first study the seasonal and geographical behavior of gravity
wave activity in the lower stratosphere over the southernmost Andes
mountains and their prolongation in the Antarctic Peninsula by
global positioning system (GPS) radio occultation (RO) temperature
profiles, obtained between years 2002 and 2005 by the CHAllenging
Minisatellite Payload (CHAMP) mission. The observed features
complement observations in the same zone by other satellite passive
remote sensing instruments, which are able to detect different
height regions and other spectral intervals of the wave spectrum.
Comparisons with previous GPS RO studies in smaller areas than the
one covered in our analysis are also established. Significant
seasonal variation of wave activity is observed in our work, in
agreement with results from other instruments. The locations of
significant cases indicate that topography is an important source.
Some strong wave activity is also found over open ocean. Critical
level filtering is shown to have an attenuation effect, implying
that a large fraction of the observed activity can be considered to
be an outcome of mountain waves. The studied region has a
significant advantage as compared to other regions of our planet: it
generates wavefronts nearly aligned with the North-South direction
(almost parallel to the mountains), whereby this geometry favors the
wave detection by the nearly meridional line of sight characterizing
most of the GPS RO observations used. A distribution of the observed
gravity waves in terms of amplitudes and wavelengths is also
presented. |
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