engleski

Atmospheric origin of an Adriatic meteotsunami

The meteotsunamis seem to originate from atmospheric propagating pressure disturbances, usually gravity waves. There are generally two ways in which atmospheric gravity waves can propagate over long distances – wave duct and wave-convection coupling. Up to now, the wave duct mechanism was most commonly observed, particularly related to the air-sea forcing. The case that occurred over the east Adriatic on 26/27 June 2003 was characterized by different conditions. The governing mechanism could only be attributed to the wave-convection coupling, where convective activity was manifested as the strong mesoscale convective system that originated over the Alps and propagated along the Adriatic towards the southeast. The MM5 atmospheric numerical model successfully reproduced certain characteristics of the event, particularly its amplitude and phase speed. However, the timing and detailed structure were not as accurate. Implications for forecasting of similar phenomena are discussed.

pressure disturbance; gravity wave; wave-CISK; convection; numerical model; Adriatic; Hvar

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