Deposition of Ozone and Scidic Components in Two Forest Ecosystems in Austria : Proceedings of the Joint Symposium "Environmental Threats to Forest and Other Natural Ecosystems" held at the University of Oulu, Finland, November, 1-4, 1988 : Ecological impact of acidification

1989

137-149

10 Tab., 13 Lit

Unselbständiges Werk

200060897

Dry deposition estimations by the concentration/deposition velocity method requires knowledge of the seasonal variation of atmospheric concentrations of SO2, particulate SO4¬-, NO2, HNO3, particulate NO3-, NH3, and particulate NH4+. These compounds and additionally volatile organic acids /formic and acetic acid/ have been measured on Exelberg and in Schöneben /eastern and upper Austria/ during five different field studies. Full seasonal data for SO2, NO2, O3, and meteorological parameters were available from routine monitoring stations at the above sites. Using the concentration levels obtained in this work and adapting deposition velocities from the literature it was possible to estimate a yearly dry deposition of ozone sulfur and nitrogen. The calculated total dry deposition of sulfur was 21 kg/ha and year on Exelberg, while it was about 50% lower, i.w. 10 kg/ha in Schöneben. The yearly amount of nitrogen originating from NO2 and HNO3 was 16.5 kg/ha, and that originating from ammonium 11.5 kg/ha, for the Exelberg region. The corresponding values for Schöneben were 8.5 and 10 kg/ha and year, respectively. Ozone deposition was calculated to be 160 kg/ha and year at Exelberg and 135 kg/ha and year at Schöneben. The data are compared with dry deposition estimates obtained by the "throughfall" method.