冬季から春季にかけて東シナ海上を伝播する気象津波の発生源に関する解析 Origins of Atmospheric Disturbance Resulted in Meteotsunamis propagated over the East China Sea in Winter and Spring Season

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Abstract

Abiki is a kind of meteotsunami (a large amplified seiche) reached to west Kyushu coastal area. This study is aimed to clarify the characteristics of the atmospheric disturbance forcing the tsunami-like ocean long wave. The sea-level pressure disturbance observed and modeled 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 a help of both wave-duct and wave-CISK (conditional instability of the second kind) mechanisms. The backward trajectory analysis also showed that the atmospheric gravity wave propagated with its phase speed of aroung 30 ms<sup>-1</sup>, and it took 8-12 hours from atmospheric wave source to Kyushu coastal area. Hence, the forecast of the midtroposhere instability can be useful for the meteotsunami prediction.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 67(2), I_391-I_395, 2011

    Japan Society of Civil Engineers

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