Spatial and temporal trends of ozone distribution in the Jizerské hory Mountains of the Czech Republic
2016
Hůnová, Iva | Stoklasová, Petra | Schovánková, Jana | Kulasová, Alena
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.
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