Laboratory measurement of dry deposition of ozone onto northern Chinese soil samples

Abstract

We used laboratory experiments to investigate surface resistance (R c) to dry deposition of ozone (O3) on different types of soil samples collected from the arid deserts and the Loess Plateau of northern China. Furthermore, we measured the factors that affected R c, which depends on the physical and chemical interaction between trace constituents and the deposition surface, and evaluated deposition velocity (V d). There was little influence of geometric surface area, soil weight, or O 3 concentration on V d of O3. The effect of relative humidity (RH) (i.e. moisture content of the soil) on O3 uptake was in agreement with results reported in the literature: a distinct RH dependence of V d and little uptake under water-saturated conditions were observed. R c values for all the soil samples examined were in the range 0.21-3.3 s mm-1 and were exponentially related to the surface area of the particles and the organic carbon content of each soil sample at RH of both <10 and 60%. © 2007 Springer Science+Business Media B.V.