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Spatial and temporal trends of ozone distribution in the Jizerské hory Mountains of the Czech Republic

Hůnová, Iva, Stoklasová, Petra, Schovánková, Jana, Kulasová, Alena
Environmental science and pollution research international 2016 v.23 no.1 pp. 377-387
altitude, edge effects, forests, monitoring, mountains, ozone, samplers, Czech Republic, Southern European region
We present results of the 5-year monitoring of ambient O₃ concentrations in a Central European medium altitude mountain forested area. O₃ levels were measured at 11 sites between 714 and 1000 m a.s.l. in 2006–2010 vegetation seasons using Ogawa diffusive samplers. Our results reveal that O₃ exposure in the Jizerské hory Mts. was relatively high and comparable with polluted sites in Southern Europe and in higher altitudes. O₃ concentrations differed significantly between individual sites and in individual years. O₃ concentrations showed clear dependence on altitude at sites with similar aspect. Its gradient for the entire 5-year period under review equaled 3.5 ppb/100 m of altitude, ranging between nearly 5 ppb/100 m of altitude in 2006 and nearly 3 ppb/100 m of altitude in 2010. O₃ concentrations at the site with northern aspect were consistently significantly lower than at the site at similar altitude with southern aspect. O₃ concentrations measured at the forest edge were consistently lower than those measured at the same site but at the forest clearing. It is evident that the macro-setting of the O₃ monitoring site is crucial for obtaining reliable results with high representativeness for the area.