We implemented a multi-layer O3
dry deposition model in a 1D model SOSAA to simulate O3
flux and concentration within and above the boreal forest at SMEAR II in Hyytiälä, Finland, in August 2010. This August was extremely warm and dry, which might represent summer conditions at this site in future. The results showed that when RH > 70 % the O3
uptake on wet skin was 48.6 % to the total deposition at night and 22.0 % at daytime. The sub-canopy contribution was 40 % at daytime and 40–65 % at night.