Naslov
Impact of the large-scale wind and mesoscale shallow flows on the development of cumulonimbus clouds over Istria

Autori
Poljak, Gabrijela ; Babić, Karmen ; Kvakić, Marko ; Telišman Prtenjak, Maja

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Skup
Croatian-USA Workshop on Mesometeorology

Mjesto i datum
Ekopark Kraš Resort near Zagreb, Croatia, 18.06.2012. - 20.06.2012

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
large-scale wind; sea breeze; cumulonimbus

Sažetak
An analysis of deep convective activity has been showed that the northeastern Adriatic represents the most convective area in Croatia. In particular, the Istrian peninsula. Every other day there was marked as a day with convection in the warm part of the year. Furthermore, in 82% of days with convective activity was observed during three dominant wind regimes on a large scale. They were from the SW (46%), NE (18%) and NW (18%) directions. Mesoscale local thermal-induced wind is also common in Istria, appearing every other day during the summer. Therefore here, with three selected cases (for every type of the dominant large-scale wind regime) we investigate the impact of jointed large scale wind and thermally-induced local wind on the development of cumulonimbus clouds. For this purpose we use the available measurements, satellite images and WRF numerical simulations at fine resolution. Among other, results indicate that the SW large-scale wind superimposed on the western sea breeze increases humidity advection at the foot of the mountains in the northeast of the Istrian peninsula. The large- scale NE wind is opposite to the dominant western sea breeze and prevents its deeper penetration over the peninsula. Nevertheless, the interaction reinforces the convergence of the flow field in the boundary layer and consequently the intensity of sea breeze fronts and its updrafts. The effects of NE and SW synoptic winds are somewhat similar. In all cases, the result is favorable conditions for the Cb development in the form of multi-cells.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA