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Open AccessArticle

Nitrogen Deposition on Danish Nature

Department of Environmental Science, Aarhus University, P.O. Box 358, Frederiksborgvej 399, 4000 Roskilde, Denmark
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Atmosphere 2018, 9(11), 447; https://doi.org/10.3390/atmos9110447
Received: 15 August 2018 / Revised: 25 October 2018 / Accepted: 9 November 2018 / Published: 14 November 2018
Eutrophication events are frequent in Inner Danish waters and critical loads are exceeded for much of the Danish sensitive terrestrial ecosystems. The Danish air quality monitoring program combines measurements and model calculations to benefit from the complementarities in data from these two sources. Measurements describe actual status, seasonal variation, and temporal trends. Model calculations extrapolate the results to the entire country and determine depositions to specific ecosystems. Measurements in 2016 show annual depositions between 7.5 and 11 kg N/ha to terrestrial ecosystems, and a load to marine waters of 5.3 kg N/ha. The deposition on Danish marine waters in 2016 was calculated to be 73,000 tons N with an average deposition of 6.9 kg N/ha. For terrestrial areas, the deposition was calculated to be 57,000 tons N with an average deposition of 13 kg N/ha. This is above critical loads for sensitive ecosystems. Long-term trends show a 35% decrease since 1990 in measured annual nitrogen deposition. At two out of four stations in nature areas, measured ammonia levels exceeded critical levels for lichens and mosses. Conclusions: Nitrogen loads and levels to Danish nature is decreasing, but critical loads and levels are still exceeded for sensitive ecosystems. Combining measurements and model calculations is a strong tool in monitoring. View Full-Text
Keywords: ammonia; ammonium; nitrate; nitrogen oxides; atmospheric transport; dry deposition; wet deposition; critical loads; nitrogen budget; source apportionment; sensitive ecosystems ammonia; ammonium; nitrate; nitrogen oxides; atmospheric transport; dry deposition; wet deposition; critical loads; nitrogen budget; source apportionment; sensitive ecosystems
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Ellermann, T.; Nygaard, J.; Christensen, J.H.; Løfstrøm, P.; Geels, C.; Nielsen, I.E.; Poulsen, M.B.; Monies, C.; Gyldenkærne, S.; Brandt, J.; Hertel, O. Nitrogen Deposition on Danish Nature. Atmosphere 2018, 9, 447.

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