Naslov
An analysis of the instability indices based on atmospheric soundings data in Croatia

Autori
Ćurić, Martina ; Stilinović, Tomislav ; Telišman Prtenjak, Maja

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

Skup
Meteorološki izazovi 4/Challenges in Meteorology 4

Mjesto i datum
Zagreb, Hrvatska, 24.11.2015. - 25.11.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
atmospheric instability indices; total lightning; weather types; wind regimes

Sažetak
He study investigates the sensitivity of the high-resolution mesoscale atmospheric model by the model reproduction of the combined large-scale wind and thermally induced local wind (i.e. sea breeze) on the moist convection development. The area of the interest is Istria, the largest peninsula in the north-eastern Adriatic. The three chosen cases were simulated by the Weather and Research Forecasting (WRF-ARW) model at three (nested) model domains with the 1.5-km horizontal grid spacing in the innermost domain. The sensitivity tests were made varying (i) the model setup, (ii) the sea surface temperature (SST) distribution and (iii) the model topography. The first set of the simulations, over the 3 summer 1.5-day periods were carried out through the modification of the model setup, varying microphysics and the boundary layer parameterizations. The SST distribution has two representations in the model: a weakly time-varying SST field (every 6 h) from the ECMWF skin temperature analysis and a varying SST field provided by hourly geostationary satellite data. The same events were simulated with the modified topography but without the largest mountains along Istria in the smallest domain when the mountain heights were reduced to 30% of the initial height. A comprehensive set of the numerical experiments was statistically analyzed in a several ways: by the standard statistical measures, the image moment analysis approach and the spectral method. The results of the each model setup were compared with available measurements, which were provided by the standard station measurements and each of these approaches showed optimal combination of the model schemes. The SST variations revealed the effect on the lowermost variations in the boundary layer and on the evolution of the turbulent fluxes, sea breeze cells and cumulonimbus clouds. The modified topography exposed variations in the origin, timing and the amount of the convective activity as well as on the sea breeze evolution and dimensions

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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