Analyses of NOx and wet depositions at Mühleggerköpfl,North Tyrolean Limestone Alps |
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Authors: | Smidt Stefan |
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Affiliation: | 1.Institut für Immissionsforschung und Forstchemie,Forstliche Bundesversuchsanstalt Wien,Vienna,Austria |
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Abstract: | The intensive investigation site ‘Mühleggerköpfl’ in the North Tyrolean Limestone Alps can be classified as a clean-air area site. The mean concentrations of NOx are far below the effect-related limit value of the WHO (30 μg NOx m−3). The gravitational depositions in the open field (bulk deposition) ranged from 10.8 to 14.7 kg N ha−1 a−1 (throughfall: 11.3 to 12.3 kg N ha−1 a−1) in the measuring years 1998 to 2000. Compared to these data, depositions in other forested areas of the Austrian Alps amounted to up to 30 kg N ha−1 a−1. The gravitational depositions (bulk deposition) alone - without considering dry and occult deposition - slightly exceeded the lower limit of Critical Loads for coniferous and deciduous forests (> 10 kg N ha−1 a−1), but were below the Critical Loads for calcareous forests (15–20 kg N ha−1 a−1). |
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