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| Hauptseite > Publikationsdatenbank > Untersuchungen zur trockenen Deposition und Emission von atmosphärischem NO, NO$_{2}$ und HNO$_{3}$ an natürlichen Oberflächen |
| Hauptseite > Publikationsdatenbank > Untersuchungen zur trockenen Deposition und Emission von atmosphärischem NO, NO$_{2}$ und HNO$_{3}$ an natürlichen Oberflächen |
| Book/Report | FZJ-2018-02648 |
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1986
Kernforschungsanlage Jülich, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/18282
Report No.: Juel-2054
Abstract: Emission and dry deposition of the atmospheric nitrogen oxides NO, NO$_{2}$ and HNO$_{3}$ from and to vegetated and base soils and a natural water surface were determined in numerous laboratory and field experiments. The influence of soil temperature, soil water content and atmospheric mixing ratio of the respective nitrogen oxide on its exchange at the soil-air-boundary was evaluated in the laboratory by means of the dynamic chamber method. These parameters showed to be of tremendous importance for amount and direction of the flux of nitroen oxides. Main result in discussing the field experiments was that emission and deposition of NO and NO$_{2}$ exist simultaneously. The veritcal flux of NO and NO$_{2}$ was a coupling of two parts - directed from the atmosphere to the soil and vice versa at the same time. Resulting net fluxes of up to $\pm$ 10$^{3} \mu g n^{-2}h^{-1}$ were found, depending on atmospheric and soil parameters. This explains the large variance of NO and NO$_{2}$ deposition velocity values found in the literature. In the case of HNO$_{3}$ only deposition was found. Deposition velocities ranged from 0.4 to 0.8 cm s$^{-1}$ (base soil and lake water surface) up to 6 cm s$^{-1}$ (soil with sugar beets) independent of temperáture and soil water content. Many additional field experiments with the gradient method and the chamber method supported the results of the laboratory experiments.
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