Assessing future nitrogen deposition and carbon cycle feedback using a multimodel approach: Analysis of nitrogen deposition

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Read Full Article (file size: 8853755 bytes) Cited by JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 110, D19303, doi:10.1029/2005JD005825, 2005 Assessing future nitrogen deposition and carbon cycle feedback using a multimodel approach: Analysis of nitrogen deposition J.-F. Lamarque National Center for Atmospheric Research, Boulder, Colorado, USA J. T. Kiehl National Center for Atmospheric Research, Boulder, Colorado, USA G. P. Brasseur Max-Planck Institute for Meteorology, Hamburg, Germany T. Butler Max-Planck Institute for Chemistry, Mainz, Germany P. Cameron-Smith Lawrence Livermore National Laboratory, Livermore, California, USA W. D. Collins National Center for Atmospheric Research, Boulder, Colorado, USA W. J. Collins Hadley Centre, Met Office, Exeter, UK C. Granier Max-Planck Institute for Meteorology, Hamburg, Germany Service d'Aéronomie/Institut Pierre-Simon Laplace, Paris, France CIRES/NOAA Aeronomy Laboratory, Boulder, Colorado, USA D. Hauglustaine Laboratoire des Sciences du Climat et de l'Environnement/Institut Pierre-Simon Laplace, Gif sur Yvette, France P. G. Hess National Center for Atmospheric Research, Boulder, Colorado, USA E. A. Holland National Center for Atmospheric Research, Boulder, Colorado, USA L. Horowitz Geophysical Fluid Dynamics Laboratory/NOAA, Princeton, New Jersey, USA M. G. Lawrence Max-Planck Institute for Chemistry, Mainz, Germany D. McKenna National Center for Atmospheric Research, Boulder, Colorado, USA P. Merilees National Center for Atmospheric Research, Boulder, Colorado, USA M. J. Prather Earth System Science, University of California, Irvine, California, USA P. J. Rasch National Center for Atmospheric Research, Boulder, Colorado, USA D. Rotman Lawrence Livermore National Laboratory, Livermore, California, USA D. Shindell NASA Goddard Institute for Space Studies, New York, New York, USA P. Thornton National Center for Atmospheric Research, Boulder, Colorado, USA Abstract In this study, we present the results of nitrogen deposition on land from a set of 29 simulations from six different tropospheric chemistry models pertaining to present-day and 2100 conditions. Nitrogen deposition refers here to the deposition (wet and dry) of all nitrogen-containing gas phase chemical species resulting from NO_x (NO + NO₂) emissions. We show that under the assumed IPCC SRES A2 scenario the global annual average nitrogen deposition over land is expected to increase by a factor of ∼2.5, mostly because of the increase in nitrogen emissions. This will significantly expand the areas with annual average deposition exceeding 1 gN/m²/year. Using the results from all models, we have documented the strong linear relationship between models on the fraction of the nitrogen emissions that is deposited, regardless of the emissions (present day or 2100). On average, approximately 70% of the emitted nitrogen is deposited over the landmasses. For present-day conditions the results from this study suggest that the deposition over land ranges between 25 and 40 Tg(N)/year. By 2100, under the A2 scenario, the deposition over the continents is expected to range between 60 and 100 Tg(N)/year. Over forests the deposition is expected to increase from 10 Tg(N)/year to 20 Tg(N)/year. In 2100 the nitrogen deposition changes from changes in the climate account for much less than the changes from increased nitrogen emissions. Received 31 January 2005; accepted 7 July 2005; published 5 October 2005. Keywords: nitrogen deposition; carbon cycle; nitrogen oxides; IPCC A2 scenario. Index Terms: 0426 Biogeosciences: Biosphere/atmosphere interactions (0315); 0322 Atmospheric Composition and Structure: Constituent sources and sinks; 0469 Biogeosciences: Nitrogen cycling. Read Full Article (file size: 8853755 bytes) Cited by Citation: Lamarque, J.-F., et al. (2005), Assessing future nitrogen deposition and carbon cycle feedback using a multimodel approach: Analysis of nitrogen deposition, J. Geophys. Res., 110, D19303, doi:10.1029/2005JD005825. Copyright 2005 by the American Geophysical Union.

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