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| Titel |
Rayleigh lidar observations of enhanced stratopause temperature over Gadanki (13.5° N, 79.2° E) during major stratospheric warming in 2006 |
| VerfasserIn |
S. Sridharan, S. Sathishkumar, K. Raghunath |
| 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 ; 27, no. 1 ; Nr. 27, no. 1 (2009-01-22), S.373-379 |
| Datensatznummer |
250016378
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| Publikation (Nr.) |
 copernicus.org/angeo-27-373-2009.pdf |
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| Zusammenfassung |
| Rayleigh lidar observations of temperature structure and gravity wave
activity were carried out at Gadanki (13.5° N, 79.2° E) during
January–February 2006. A major stratospheric warming event occurred
at high latitude during the end of January and early February. There was a
sudden enhancement in the stratopause temperature over Gadanki coinciding
with the date of onset of the major stratospheric warming event which occurred at high
latitudes. The temperature enhancement persisted even after the end of the
high latitude major warming event. During the same time, the UKMO (United
Kingdom Meteorological Office) zonal mean temperature showed a similar warming
episode at 10° N and cooling episode at 60° N around the region of
stratopause. This could be due to ascending (descending) motions at high
(low) latitudes above the critical level of planetary waves, where there
was no planetary wave flux. The time variation of the gravity wave
potential energy computed from the temperature perturbations over Gadanki
shows variabilities at planetary wave periods, suggesting a non-linear
interaction between gravity waves and planetary waves. The space-time
analysis of UKMO temperature data at high and low latitudes shows the
presence of similar periodicities of planetary wave of zonal wavenumber 1. |
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