Supplementary material to "Large but decreasing effect of ozone on the European carbon sink"

Abstract

Here we use the latest literature on O3 dose-response relationships derived from observed field data across Europe (CLRTAP, 2017) 10 to calculate the key PFT-specific parameters. Data comes from the UNECE CLRTAP (2017) report which is a synthesis of the latest 11 peer reviewed literature, collated by a panel of experts and so is considered the state-of the art knowledge. Each PFT was calibrated 12for a high and low plant O3 sensitivity to account for uncertainty in the sensitivity of different plant species to O3, using the approach 13of Sitch et al., (2007 22to limitations in data availability, the shrub parameterisation uses the observed dose-response functions for broadleaf trees. 23Similarly, the parameterisation for C4 herbaceous uses the observed dose-responses for C3 herbaceous, however the fractional cover 24 of C4 herbs across Europe is low (Fig. S1), so this assumption affects a very small percentage of land cover. See Table S1 and Figure 25 S2. 26