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| Titel |
Atmospheric gravity waves in the Red Sea: a new hotspot |
| VerfasserIn |
J. M. Magalhaes, I. B. Araújo, J. C. B. Silva, R. H. J. Grimshaw, K. Davis, J. Pineda |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 18, no. 1 ; Nr. 18, no. 1 (2011-02-03), S.71-79 |
| Datensatznummer |
250013868
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| Publikation (Nr.) |
 copernicus.org/npg-18-71-2011.pdf |
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| Zusammenfassung |
| The region of the Middle East around the Red Sea (between 32° E and
44° E longitude and 12° N and 28° N latitude) is a currently undocumented
hotspot for atmospheric gravity waves (AGWs). Satellite imagery shows
evidence that this region is prone to relatively high occurrence of AGWs
compared to other areas in the world, and reveals the spatial
characteristics of these waves. The favorable conditions for wave
propagation in this region are illustrated with three typical cases of AGWs
propagating in the lower troposphere over the sea. Using weakly nonlinear
long wave theory and the observed characteristic wavelengths we obtain phase
speeds which are consistent with those observed and typical for AGWs, with
the Korteweg-de Vries theory performing slightly better than
Benjamin-Davis-Acrivos-Ono theory as far as phase speeds are concerned.
ERS-SAR and Envisat-ASAR satellite data analysis between 1993 and 2008
reveals signatures consistent with horizontally propagating large-scale
internal waves. These signatures cover the entire Red Sea and are more
frequently observed between April and September, although they also occur
during the rest of the year. The region's (seasonal) propagation conditions
for AGWs, based upon average vertical atmospheric stratification profiles
suggest that many of the signatures identified in the satellite images are
atmospheric internal waves. |
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