ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-11-21533-2011 Projected change in atmospheric nitrogen deposition to the Baltic Sea towards 2020 Geels C. 1 Hansen K. M. 1 Christensen J. H. 1 Ambelas Skjøth C. 2 Ellermann T. 1 Hedegaard G. B. 1 3 Hertel O. 1 4 Frohn L. M. 1 Gross A. 1 Brandt J. 1 Department of Environmental Science, Aarhus University, Roskilde, Denmark Faculty of Science, Lund University, Sweden Danish Climate Center, Danish Meteorological Institute, Copenhagen, Denmark Department for Environmental, Social and Spatial Change, Roskilde University, Denmark 28 07 2011 11 7 21533 21567 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/11/21533/2011/acpd-11-21533-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/11/21533/2011/acpd-11-21533-2011.pdf

The ecological status of the Baltic Sea has for many years been affected by the high input of both waterborne and airborne nutrients. The focus is here on the airborne input of nitrogen (N) and the projected changes in this input, assuming the new National Emission Ceilings directive (NEC-II), currently under negotiation in the EU, is fulfilled towards the year 2020. The Danish Eulerian Hemispheric Model (DEHM) has been used to estimate the development in N deposition based on present day meteorology combined with present day (2007) or future (2020) anthropogenic emissions. By using a so called tagging method in the DEHM model, the contribution from ship traffic and from each of the nine countries with coastlines to the Baltic Sea has been assessed. The annual deposition to the Baltic Sea is estimated to be 203 k tonnes N for the present day scenario (2007) and 165 k tonnes N in the 2020 scenario, giving a projected reduction of 38 k tonnes N in the annual load in 2020. This equals a decline in N deposition of 19 %. The results from 20 model runs using the tagging method show that of the total N deposition in 2007, 52 % came from emissions within the bordering countries. By 2020 this is projected to decrease to 48 %. For some countries the projected decrease in N deposition arising from the implementation of the NEC-II directive will be a considerable part of the reductions agreed on in the provisional reduction targets of the Baltic Sea Action Plan. This underlines the importance of including projections like the current in future updates of the Baltic Sea Action Plan.

 References Amann, M., Bertok, I., Cofala, J., Heyes, C., Klimont, Z., Rafaj, P., Schöpp, W., and Wagner, F., National Emission Ceilings for 2020 based on the 2008 Climate & Energy Package. NEC Scenario Analysis Report #6 International Institute for Applied System Analysis (IIASA), Laxenburg, Austria. Andersen, J., Axe, P., Backer, H., Carstensen, J., Claussen, U., Fleming-Lehtinen, V., Järvinen, M., Kaartokallio, H., Knuuttila, S., Korpinen, S., Kubiliute, A., Laamanen, M., Lysiak-Pastuszak, E., Martin, G., Murray, C., Møhlenberg, F., Nausch, G., Norkko, A., and Villnäs, A., Getting the measure of eutrophication in the Baltic Sea: towards improved assessment principles and methods, Biogeochem., 1–20, 2010. Bartnicki, J., Semeena, V. S., and Fagerli, H.: Atmospheric deposition of nitrogen to the Baltic Sea in the period 1995–2006, Atmos. Chem. Phys. Discuss., 11, 1803–1834, http://dx.doi.org/10.5194/acpd-11-1803-2011doi:10.5194/acpd-11-1803-2011, 2011. Brandt, J., Christensen, J. H., Frohn, L. M., and Berkowicz, R., Air pollution forecasting from regional to urban street scale – implementation and validation for two cities in Denmark, Phys. Chem. Earth, 28, 335–344, 2003. Brandt, J., Christensen, J. H., Frohn, L. M., Palmgren, F., Berkowicz, R., and Zlatev, Z.: Operational air pollution forecasts from European to local scale, Atmos. Environ., 35, S91–S98, 2001. Brandt, J., Silver, J., Frohn, L. M., Geels, C., Groos, A., Hansen, A. B., Hansen, K. M., Hedegaard, G. B., Skjøth, C. A., Villadsen, H., Zare, A., and Christensen, J. H.: An integrated model study for Europe and North America using the Danish Eulerian Hemispheric Model with focus on intercontinental transport of air pollution, Atmos. Environ., submitted, 2011a. Brandt, J., Silver, J. D., Christensen, J. H., Andersen, M. S., Bønneløkke, J. H., Sigsgaard, T., Geels, C., Groos, A., Hansen, A. B., Hansen, K. M., Hedegaard, G. B., Kaas, E., and Frohn, L. M.: Assessment of Health-Cost Externalities of Air Pollution in Denmark and Europe using the EVA-Model System, Sci. Total Environ., submitted\textbf, 2011b. Christensen, J. H.: The Danish Eulerian hemispheric model – A three-dimensional air pollution model used for the Arctic, Atmos. Environ., 31, 4169–4191, 1997. Christensen, J. H., Brandt, J., Frohn, L. M., and Skov, H.: Modelling of Mercury in the Arctic with the Danish Eulerian Hemispheric Model, Atmos. Chem. Phys., 4, 2251–2257, http://dx.doi.org/10.5194/acp-4-2251-2004doi:10.5194/acp-4-2251-2004, 2004. Cooter, E. J., Bash, J. O., Walker, J. T., Jones, M. R., and Robarge, W., Estimation of NH3 bi-directional flux from managed agricultural soils, Atmos. Environ., 44, 2107–2115, 2010. Emberson, L. D., Ashmore, M. R., Cambridge, H. M., Simpson, D., and Tuovinen, J. P.: Modelling stomatal ozone flux across Europe, Environmental Pollution, 109, 403–413, 2000. Forsius, M., Posch, M., Aherne, J., Reinds, G. J., Christensen, J., and Hole, L.: Assessing the Impacts of Long-Range Sulfur and Nitrogen Deposition on Arctic and Sub-Arctic Ecosystems, Ambio, 39, 136–147, 2010. Frohn, L. M., Christensen, J. H., and Brandt, J.: Development of a high-resolution nested air pollution model – The numerical approach, J. Comput. Phys., 179, 68–94, 2002. Frohn, L. M., Hansen, K. M., Hasler, B., Gross, A., Geels, C., Christensen, J. H., Brandt, J., Skjøth, C. A., Hedegaard, G. B., Hansen, A. B., and Zare, A.: Nitrogen deposition to the Baltic Sea – who are the main contributors?, Aquat. Ecosyst. Health, in preparation, 2011. Ganzeveld, L. N., Lelieveld, J., Dentener, F. J., Krol, M. C., Bouwman, A. J., and Roelofs, G.-J.: Global soil-biogenic NO<sub>x</sub> emissions and the role of canopy processes, J. Geophys. Res., 107(D16), 4298, 17 pp., doi:10.1029/2001JD001289, 2002a. Ganzeveld, L. N., Lelieveld, J., Dentener, F. J., Krol, M. C., and Roelofs, G.-J.: Atmosphere-biosphere trace gas exchnages simulted with a single-column model, J. Geophys. Res., 107(D16), 4297, 21 pp., doi:10.1029/2001JD000684, 2002b. Geels, C., Andersen, H. A., Christensen, J. H., Ellermann, T., Skjøth, C. A., Løfstrøm, P., Gyldenkærne, S., Brandt, J., Hansen, K. M., Frohn, L. M., and Hertel, O.: Improved modelling of atmospheric ammonia over Denmark using the coupled modelling system DAMOS, Biogeosciences, in preparation, 2011. Geels, C., Doney, S. C., Dargaville, R., Brandt, J., and Christensen, J. H.: Investigating the sources of synoptic variability in atmospheric CO<sub>2</sub> measurements over the Northern Hemisphere continents: a regional model study, Tellus B, 56, 35–50, 2004. Geels, C., Gloor, M., Ciais, P., Bousquet, P., Peylin, P., Vermeulen, A. T., Dargaville, R., Aalto, T., Brandt, J., Christensen, J. H., Frohn, L. M., Haszpra, L., Karstens, U., Rödenbeck, C., Ramonet, M., Carboni, G., and Santaguida, R.: Comparing atmospheric transport models for future regional inversions over Europe – Part 1: mapping the atmospheric CO2 signals, Atmos. Chem. Phys., 7, 3461–3479, http://dx.doi.org/10.5194/acp-7-3461-2007doi:10.5194/acp-7-3461-2007, 2007. Genualdi, S., Harner, T., Cheng, Y., MacLeod, M., Hansen, K. M., van Egmond, R., Shoeib, M., and Lee, S. C.: Global Distribution of Linear and Cyclic Volatile Methyl Siloxanes in Air, Environ. Sci. Technol., 45, 3349–3354, 2011. Graedel, T. F., Bates, T. S., Bouman, A. F., Cunnold, D., Dignon, J., Fung, I., Jacob, D. J., Lamb, B. K., Logan, J. A., Marland, G., Middleton, P., Pacyna, J. M., Placet, M., and Veldt, C., A.: compilation of inventories of emissions to the atmosphere, Global Bio. Chem. Cycl., 7, 1–16, 1993. Grell, G. A., Dudhia, J., and Stauffer, D. R.: A description of the fifth-generation Penn State NCAR Mesoscale Model (MM5), Mesoscale and Microscale Meteorology Division, National Center for Atmospheric Research, Boulder, Colorado, 122, 1–22, 1995. Gyldenkærne, S., Ambelas Skjøth, C., Hertel, O., and Ellermann, T.: A dynamical ammonia emission parameterization for use in air pollution models, J. Geophys. Res-Atmos., 110, 1–14, 2005. Hansen, K. M., Christensen, J. H., Brandt, J., Frohn, L. M., Geels, C., Skjoth, C. A., and Li, Y. F.: Modeling short-term variability of alpha-hexachlorocyclohexane in Northern Hemispheric air, J. Geophys. Res-Atmos., 113, D02310, 15 pp., doi:10.1029/2007JD008492, 2008. Hedegaard, G. B., Brandt, J., Christensen, J. H., Frohn, L. M., Geels, C., Hansen, K. M., and Stendel, M.: Impacts of climate change on air pollution levels in the Northern Hemisphere with special focus on Europe and the Arctic, Atmos. Chem. Phys., 8, 3337–3367, http://dx.doi.org/10.5194/acp-8-3337-2008doi:10.5194/acp-8-3337-2008, 2008. Hedegaard, G. B., Gross, A., Christensen, J. H., May, W., Skov, H., Geels, C., Hansen, K. M., and Brandt, J.: Modelling the impacts of climate change on tropospheric ozone over three centuries, Atmos. Chem. Phys. Discuss., 11, 6805–6843, http://dx.doi.org/10.5194/acpd-11-6805-2011doi:10.5194/acpd-11-6805-2011, 2011. HELCOM: Airborne nitrogen loads to the Baltic Sea, Helsinki Commission, Baltic Marine Environment Protection Commission, 1–24, 2005. Hertel, O., Christensen, J., Runge, E. H., Asman, W. A. H., Berkowicz, R., Hovmand, M. F., and Hov, Ø.: Development and Testing of A New Variable Scale Air-Pollution Model – Acdep, Atmos. Environ., 29, 1267–1290, 1995. Hertel, O., Ellermann, T., Palmgren, F., Berkowicz, R., Lofstrom, P., Frohn, L. M., Geels, C., Skjoth, C. A., Brandt, J., Christensen, J., Kemp, K., and Ketzel, M.: Integrated air-quality monitoring – combined use of measurements and models in monitoring programmes, Environ. Chem., 4, 65–74, 2007. Hertel, O., Ambelas Skjøth, C., Brandt, J., Christensen, J. H., Frohn, L. M., and Frydendall, J.: Operational mapping of atmospheric nitrogen deposition to the Baltic Sea, Atmos. Chem. Phys., 3, 2083–2099, http://dx.doi.org/10.5194/acp-3-2083-2003doi:10.5194/acp-3-2083-2003, 2003. Hertel, O., Skjoth, C. A., Lofstrom, P., Geels, C., Frohn, L. M., Ellermann, T., and Madsen, P. V.: Modelling nitrogen deposition on a local scale – A review of the current state of the art, Environ. Chem., 3, 317–337, 2006. Hole, L. R., Christensen, J. H., Ruoho-Airola, T., Torseth, K., Ginzburg, V., and Glowacki, P.: Past and future trends in concentrations of sulphur and nitrogen compounds in the Arctic, Atmos. Environ., 43, 928–939, 2009. Hongisto, M. and Joffre, S.: Meteorological and climatological factors affecting transport and deposition of nitrogen compounds over the Baltic Sea, Boreal Environ. Res., 10, 1–17, 2005. Karthikeyan, S., He, J., Palani, S., Balasubramanian, R., and Burger, D.: Determination of total nitrogen in atmospheric wet and dry deposition samples, Talanta, 77, 979–984, 2009. Krishnamurthy, A., Moore, J. K., Mahowald, N., Luo, C., and Zender, C. S.: Impacts of atmospheric nutrient inputs on marine biogeochemistry, J. Geophys. Res-Biogeo., 115, G01006, 13 pp., 2010. Lamarque, J.-F., Bond, T. C., Eyring, V., Granier, C., Heil, A., Klimont, Z., Lee, D., Liousse, C., Mieville, A., Owen, B., Schultz, M. G., Shindell, D., Smith, S. J., Stehfest, E., Van Aardenne, J., Cooper, O. R., Kainuma, M., Mahowald, N., McConnell, J. R., Naik, V., Riahi, K., and van Vuuren, D. P.: Historical (1850–2000) gridded anthropogenic and biomass burning emissions of reactive gases and aerosols: methodology and application, Atmos. Chem. Phys., 10, 7017–7039, http://dx.doi.org/10.5194/acp-10-7017-2010doi:10.5194/acp-10-7017-2010, 2010. Langner, J., Andersson, C., and Engardt, M.: Atmospheric input of nitrogen to the Baltic Sea basin: present situation, variability due to meteorology and impact of climate change, Boreal Environ. Res., 14, 226–237, 2009. Massad, R.-S., Nemitz, E., and Sutton, M. A.: Review and parameterisation of bi-directional ammonia exchange between vegetation and the atmosphere, Atmos. Chem. Phys., 10, 10359–10386, http://dx.doi.org/10.5194/acp-10-10359-2010doi:10.5194/acp-10-10359-2010, 2010. McLachlan, M. S., Kierkegaard, A., Hansen, K. M., van Egmond, R., Christensen, J. H., and Skjøth, C. A.: Concentrations and Fate of Decamethylcyclopentasiloxane (D5) in the Atmosphere, Environ. Sci. Technol., 44, 5365–5370, 2010. Olesen, H. R., Winther, M., Ellermann, T., Christensen, J. H., and Plejdrup, M. S.: Ship emissions and air pollution in Denmark: Present situation and future scenarios, The Danish Environmental Protection Agency, 2009. Pul, A. v., Hertel, O., Geels, C., Dore, A. J., Vieno, M., Jaarsveld, H. A. v., Bergström, R., Schapp, M., and Fagerli, H.: Modelling the Atmospheric Transport and Deposition of Ammonia at a National and regional Scale in: Atmospheric Ammonia; Detecting emission changes and environmental impacts: Springer, edited by: Sutton, M. A. and Reis, S. B. S. M. H., p. 464, 2009. Schultz, M. G., Heil, A., Hoelzemann, J. J., Spessa, A., Thonicke, K., Goldammer, J. G., Held, A. C., Pereira, J. M. C., and van het Bolscher, M.: Global wildland fire emissions from 1960 to 2000, Global Biogeochem. Cy., 22, GB2002, 17 pp., doi:10.1029/2007GB003031, 2008. Simpson, D., Fagerli, H., Jonson, J. E., Tsyro, S., Wind, P., and Tuovinen J.-P.: Transboundary Acidification, Eutrophication and Ground Level Ozone in Europe, PART I, Unified EMEP Model Description., 1–104, 1-8-2003. Skjøth, C. A., Geels, C., Berge, H., Gyldenkærne, S., Fagerli, H., Ellermann, T., Frohn, L. M., Christensen, J., Hansen, K. M., Hansen, K., and Hertel, O.: Spatial and temporal variations in ammonia emissions – a freely accessible model code for Europe, Atmos. Chem. Phys., 11, 5221–5236, http://dx.doi.org/10.5194/acp-11-5221-2011doi:10.5194/acp-11-5221-2011, 2011 Skjøth, C. A., Hertel, O., Gyldenkærne, S., and Ellermann, T.: Implementing a dynamical ammonia emission parameterization in the large-scale air pollution model ACDEP, J. Geophys. Res-Atmos., 109, 1–13, 2004. Sorensen, L. L., Hertel, O., Skjoth, C. A., Lund, M., and Pedersen, B.: Fluxes of ammonia in the coastal marine boundary layer, Atmos. Environ., 37, S167–S177, 2003. Spokes, L., Jickells, T., Weston, K., Gustafsson, B. G., Johnsson, M., Liljebladh, B., Conley, D., Skjøth, C. A., Brandt, J., Carstensen, J., Christiansen, T., Frohn, L., Geernaert, G., Hertel, O., Jensen, B., Lundsgaard, C., Markager, S., Martinsen, W., Møller, B., Pedersen, B., Sauerberg, K., Sorensen, L. L., Hasager, C. C., Sempreviva, A. M., Pryor, S. C., Lund, S. W., Larsen, S., Tjernstrøm, M., Svensson, G., and Zagar, M.: MEAD: An interdisciplinary study of the marine effects of atmospheric deposition in the Kattegat, Environ. Pollut., 140, 453–462, 2006. Sutton, M. A., Nemitz, E., Theobald, M. R., Milford, C., Dorsey, J. R., Gallagher, M. W., Hensen, A., Jongejan, P. A. C., Erisman, J. W., Mattsson, M., Schjoerring, J. K., Cellier, P., Loubet, B., Roche, R., Neftel, A., Hermann, B., Jones, S. K., Lehman, B. E., Horvath, L., Weidinger, T., Rajkai, K., Burkhardt, J., Lopmeier, F. J., and Daemmgen, U.: Dynamics of ammonia exchange with cut grassland: strategy and implementation of the GRAMINAE Integrated Experiment, Biogeosciences, 6, 309–331, 2009. van Vuuren, D. P., den Elzen, M. G. J., Lucas, P. L., Eickhout, B., Strengers, B. J., van Ruijven, B., Wonink, S., and van Houdt, R.: Stabilizing greenhouse gas concentrations at low levels: an assessment of reduction strategies and costs, Climatic Change, 81, 119–159, 2007. WMO: The role of Climatological normals in a changing climate, 2007. WMO: Guide to Climatological Pratices, 2010. Zhang, L., Wright, L. P., and Asman, W. A. H.: Bi-directional air-surface exchange of atmospheric ammonia: A review of measurements and a development of a big-leaf model for applications in regional-scale air-quality models, J. Geophys. Res.-Atmos., 115, D20310, 23 pp., doi:10.1029/2009JD013589, 2010.