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Tropospheric ozone (O3) produces harmful effects to forests and crops, leading to a reduction of land carbon assimilation that, consequently, influences the land sink and the crop yield production. To assess the potential negative O3 impacts to vegetation, the European Union uses the Accumulated Ozone over Threshold of 40 ppb (AOT40). This index has been chosen for its simplicity and flexibility in...
We reply to the remarks by Ferretti et al. (2014) on our paper (De Marco et al., 2014) and demonstrate that: 1. the differences in estimating AOT40 by passive sampling when using the formula proposed by either Mazzali et al. (2002) or De Marco et al. (2014) are not statistically significant; 2. the inaccuracy of the Loibl approach does not strictly depend on the averaging period, as differences between...
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