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Pregled bibliografske jedinice broj: 863274

Numerical analysis of atmospheric conditions during an exceptional meteotsunami event in the Mediterranean


Horvath, Kristian; Telišman Prtenjak, Maja; Šepić, Jadranka
Numerical analysis of atmospheric conditions during an exceptional meteotsunami event in the Mediterranean // Joint Congress of the 6th International Conference on Meteorology and Climatology of the Mediterranean & Challenges in Meteorology 5
Zagreb, Hrvatska, 2017. (poster, međunarodna recenzija, sažetak, znanstveni)


Naslov
Numerical analysis of atmospheric conditions during an exceptional meteotsunami event in the Mediterranean

Autori
Horvath, Kristian ; Telišman Prtenjak, Maja ; Šepić, Jadranka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
Joint Congress of the 6th International Conference on Meteorology and Climatology of the Mediterranean & Challenges in Meteorology 5

Mjesto i datum
Zagreb, Hrvatska, 20-22.02.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Meteotsunami , Adriatic, WRF-ARW

Sažetak
Meteotsunamis are long sea surface waves caused by propagating weakly dissipative atmospheric pressure perturbations formed by ducted internal atmospheric gravity waves and/or convection. Several high-amplitude meteotsunamis occurred in the northern Mediterranean countries during a major meteotsunami period from 23-27 June 2014. The largest sea level oscillations were recorded in Vela Luka Bay, Croatia, in the morning of 25 June 2014, where the amplitude of sea level oscillations reached 3 m. Sea level oscillations reaching 2 m were recorded also near Balearic Islands (Spain), Sicily (Italy), and Odessa (Ukraine). The extraordinary spatial dimension of this event shows that meteotsunamis can have a widespread influence that is comparable to other major tsunami-genic mechanisms. The numerical analysis of the event was carried out using the Weather and Research Forecasting (WRF) mesoscale non-hydrostatic model. The model was configured over the entire Mediterranean with the coarse horizontal grid spacing resolution of 9 km and for the four affected regions of Balearic Islands, Sicily, Adriatic and Odessa/Black Sea with three nested domains. The large-scale setting during the meteotsunami period was characterized by an incoming upper-level trough as well as the upper-level jet aloft and warm low-level advection from the African continent. As inferred by comparison with the ECMWF reanalysis, the model represents well these environmental conditions during the meteotsunami period. The dynamically unstable mid-troposphere with Richardson number smaller than 0.25 capped the warm statically stable air in the lower troposphere. These environmental conditions are generally favorable for sustaining the internal gravity waves provided the lower layer is statically stable and of sufficient depth. The oscillating surface pressure perturbations at the sea level were also represented in the simulation, especially well in the Adriatic area. Simulated pressure perturbations were sustained and reached amplitudes of several hPa at the mean sea level, which is of sufficient amplitude to cause a me- teotsunami. Finally, we discuss the strengths and weaknesses of mesoscale model simulations with respect to simulating atmospheric conditions favorable for meteotsunamis and discuss potentials of coupled atmospheric-ocean models for analysis of meteotsunami events. We also provide guidance on the model setup requirements necessary for inclusion of numerical weather prediction models in the operational applications of the meteotsunami warning system.

Izvorni jezik
Engleski

Znanstvena područja
Geologija



POVEZANOST RADA


Ustanove
Prirodoslovno-matematički fakultet, Zagreb