Trace gas exchange above the floor of a deciduous forest: 2. SO2 and O3 deposition

The pollutant uptake capacity of the surface beneath forest canopies is poorly understood. In this study we show that the eddy correlation method can be applied within a canopy. Direct measurements of SO2 and O3 deposition to the forest floor of two deciduous forests were made with the eddy correlation method. For dry periods the surface uptake resistance for SO2 was of the order of 700 s m−1. When the soil and litter were moist, the SO2 surface uptake resistance was small, resulting in deposition velocities at the forest floor that were about 2 times greater than during dry periods. SO2 deposition to the forest floor constitutes between 20 and 30% of total uptake to the forest ecosystem when the surface is moist. Soil surface uptake resistances for O3 were about 2000 s m−1 for both wet and dry periods.

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