Summer and autumn ozone fluxes to a forest in the Czech Republic Brdy Mountains

In an effort to examine ozone (O3) deposition over a forest site in the Czech Republic, a low cost eddy flux experiment using slow response ozone and temperature sensors was implemented in July 1993 within the Brdy Mountains. Half-hour 2-Hz ozone and sensible heat measurements made at the Brdy Mountains for 98 days during the period 7 July 1994–20 October 1994 are analyzed and reported. While the Czech Brdy Mountains AOT40 level for the overall 104 day period was 7.6 ppm h (15.1 ppm h for the full 24-h summation), indicating a slight potential for O3 injury, the 1994 summer to autumn measured forest O3 uptake was 2.4 (±0.9) g m−2, not unusually high compared to other studies. Average summer midday O3 fluxes and deposition velocities were −1.0 (±0.6) μg m−2 s−1 and 1.1 (±0.7) cm s−1, and autumn values were −0.36 (±0.4) μg m−2 s−1 and 0.7 (±0.5) cm s−1, respectively. A unique contribution of this study is the first time demonstrated use of slow responding sensors for eddy covariance flux measurements at heights of 20 m above a forest.