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| Titel |
Atmospheric pressure-wave bands around a cold front resulted in a meteotsunami in the East China Sea in February 2009 |
| VerfasserIn |
K. Tanaka |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 12 ; Nr. 10, no. 12 (2010-12-17), S.2599-2610 |
| Datensatznummer |
250008539
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| Publikation (Nr.) |
 copernicus.org/nhess-10-2599-2010.pdf |
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| Zusammenfassung |
| A meteotsunami hit southwest Kyushu on 25 February 2009, with an estimated
maximum amplitude of 290 cm, which was higher than that recorded for the
1979 Nagasaki event. This study investigated mesoscale meteorological
systems over the East China Sea during the time leading up to the February
2009 event using a Weather Research and Forecast model. The disturbance in
the sea-level pressure originated from a gravity wave over southeastern
China. The sea-level pressure disturbance observed and modelled over the East
China Sea had its source over the southeastern China mountains and was then
propagated by a jet stream toward western Japan with the help of both
wave-duct and wave-CISK (conditional instability of the second kind)
mechanisms. Two synoptic systems supported the momentum convergence and the
formation of band-shaped unstable layers in the mid-troposphere. The
high-latitude trough extended from eastern Siberia and there was
subtropical high pressure over the western Pacific Ocean. The phase speed of
the atmospheric wave was as high as 25–30 m s−1, corresponding to the phase
speed of long ocean waves on the East China Sea. Improvements in determining
the amplitude and timing of the disturbance remain for future work. |
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