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| Titel |
Study of equatorial Kelvin waves using the MST radar and radiosonde observations |
| VerfasserIn |
P. Kishore, I. V. Subba Reddy, S. P. Namboothiri, K. Igarashi, M. Venkat Ratnam, D. Narayana Rao, S. Vijaya Bhaskara Rao |
| 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 ; 23, no. 4 ; Nr. 23, no. 4 (2005-06-03), S.1123-1130 |
| Datensatznummer |
250015207
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| Publikation (Nr.) |
 copernicus.org/angeo-23-1123-2005.pdf |
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| Zusammenfassung |
| In this paper an attempt has been made to study equatorial Kelvin waves
using a high power coherent VHF radar located at Gadanki (13.5° N,
79.2° E), a tropical station in the Indian sub-continent. Simultaneous
radiosonde observations taken from a nearby meteorological station located
in Chennai (13.04° N, 80.17° E) were also used to see the coherence
in the observed structures. These data sets were analyzed to study the mean
winds and equatorial waves in the troposphere and lower stratosphere.
Equatorial waves with different periodicities were identified. In the
present study, particular attention has been given to the fast Kelvin wave
(6.5-day) and slow Kelvin wave (16-day). Mean zonal wind structures were
similar at both locations. The fast Kelvin wave amplitudes were somewhat
similar in both observations and the maximum amplitude is about 8m/s. The
phase profiles indicated a slow downward progression. The slow Kelvin wave
(16-day) amplitudes shown by the radiosonde measurements are a little larger
than the radar derived amplitudes. The phase profiles showed downward phase
progression and it translates into a vertical wavelength of ~10-12km. The
radar and radiosonde derived amplitudes of fast and slow Kelvin waves are
larger at altitudes near the tropopause (15-17km), where the mean wind
attains westward maximum. |
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