Estimation of dry deposition velocities of nitric oxide, sulfur dioxide, and ozone by the gradient method above short vegetation during the tract campaign

Dry flux and dry deposition velocity of nitric oxide, sulfur dioxide and ozone were measured by the gradient method during the TRACT campaign in Rhine valley, Germany, above a surface covered by short vegetation. Eddy diffusivity was calculated by means of Monin-Obukhov's similarity theory. Calculated dry deposition velocities for ozone and sulfur dioxide were 0.05-0.07 and 0.19-0.20 cm s(-1) in stable and unstable cases, respectively. In the case of nitric oxide emission was observed in daytime, probably reflecting bacterial production. (C) 1998 Elsevier Science Ltd. All rights reserved.