A gravity waves study close to the Andes mountains in Patagonia and Antarctica with GPS radio occultation observations
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...
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2010
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09927689_v28_n2_p587_Alexander http://hdl.handle.net/20.500.12110/paper_09927689_v28_n2_p587_Alexander |
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paper:paper_09927689_v28_n2_p587_Alexander2023-06-08T15:59:18Z A gravity waves study close to the Andes mountains in Patagonia and Antarctica with GPS radio occultation observations Alexander, Pedro M. Llamedo Soria, Pablo Martín De La Torre, Alejandro Eduardo Meteorology and atmospheric dynamics (Middle atmosphere dynamics; Waves and tides) atmospheric dynamics atmospheric tide atmospheric wave GPS gravity wave open ocean satellite mission seasonal variation stratosphere temperature profile wave attenuation Andes Antarctica Patagonia 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. Fil:Alexander, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Llamedo, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:De La Torre, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09927689_v28_n2_p587_Alexander http://hdl.handle.net/20.500.12110/paper_09927689_v28_n2_p587_Alexander |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Meteorology and atmospheric dynamics (Middle atmosphere dynamics; Waves and tides) atmospheric dynamics atmospheric tide atmospheric wave GPS gravity wave open ocean satellite mission seasonal variation stratosphere temperature profile wave attenuation Andes Antarctica Patagonia |
| spellingShingle |
Meteorology and atmospheric dynamics (Middle atmosphere dynamics; Waves and tides) atmospheric dynamics atmospheric tide atmospheric wave GPS gravity wave open ocean satellite mission seasonal variation stratosphere temperature profile wave attenuation Andes Antarctica Patagonia Alexander, Pedro M. Llamedo Soria, Pablo Martín De La Torre, Alejandro Eduardo A gravity waves study close to the Andes mountains in Patagonia and Antarctica with GPS radio occultation observations |
| topic_facet |
Meteorology and atmospheric dynamics (Middle atmosphere dynamics; Waves and tides) atmospheric dynamics atmospheric tide atmospheric wave GPS gravity wave open ocean satellite mission seasonal variation stratosphere temperature profile wave attenuation Andes Antarctica Patagonia |
| description |
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. |
| author |
Alexander, Pedro M. Llamedo Soria, Pablo Martín De La Torre, Alejandro Eduardo |
| author_facet |
Alexander, Pedro M. Llamedo Soria, Pablo Martín De La Torre, Alejandro Eduardo |
| author_sort |
Alexander, Pedro M. |
| title |
A gravity waves study close to the Andes mountains in Patagonia and Antarctica with GPS radio occultation observations |
| title_short |
A gravity waves study close to the Andes mountains in Patagonia and Antarctica with GPS radio occultation observations |
| title_full |
A gravity waves study close to the Andes mountains in Patagonia and Antarctica with GPS radio occultation observations |
| title_fullStr |
A gravity waves study close to the Andes mountains in Patagonia and Antarctica with GPS radio occultation observations |
| title_full_unstemmed |
A gravity waves study close to the Andes mountains in Patagonia and Antarctica with GPS radio occultation observations |
| title_sort |
gravity waves study close to the andes mountains in patagonia and antarctica with gps radio occultation observations |
| publishDate |
2010 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09927689_v28_n2_p587_Alexander http://hdl.handle.net/20.500.12110/paper_09927689_v28_n2_p587_Alexander |
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