Naslov
High Ozone Episode at ZAavižan, Croatia During 17–19 July 1998

Autori
Bencetić Klaić, Zvjezdana ; Belušić, Danijel ; Jeričević, Amela ; Cvitaš, Tomislav

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

Skup
The 12th International Conference on Harmonizaton within Atmospheric Dispersion Modelling for regulatory Purposes, HARMO 12

Mjesto i datum
Cavtat, Hrvatska, 06.10.2008. - 09.10.2008

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
ozone episode; stratospheric ozone intrusion; long range transport; EMEP model

Sažetak
Abstract: We investigated an unusual elevated-ozone episode that took place at a high altitude measuring site Zavižan (44.817°N, 14.983°E, 1594 m a.s.l.). The episode was characterized by three consecutive peaks. The first one was the highest (over 120 ppbv), and it occurred at the late night on 17 July. Following two (both about 110 ppbv) appeared approximately 18 and 36 hours after the first peak, respectively. The night-time maximum and the departure from the usual diurnal variation of ozone concentration during investigated episode point to the non-local pollution sources, rather than to local photochemical production. Thus, recorded ozone peaks might arise due to the long-range transport of photo-oxidants ; 2) stratospheric ozone intrusion ; or 3) they might be result of both (1) and (2). In order to inspect which of above processes is responsible for the increased ozone concentrations we applied the unified EMEP model, which among others, simulates atmospheric transport and deposition of photo-oxidants, and, a mesoscale numerical weather prediction model WRF-ARW V2.2. Additionally, the larger scale atmospheric conditions were examined based on the ECMWF ERA-40 reanalysis fields. Results suggest that the stratospheric ozone intrusion played an important role in the occurrence of investigated episode.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA