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Assessing future nitrogen deposition and carbon cycle feedback using a multimodel approach: Analysis of nitrogen deposition
National Center for Atmospheric Research, Boulder, Colorado, USA
National Center for Atmospheric Research, Boulder, Colorado, USA
Max-Planck Institute for Meteorology, Hamburg, Germany
Max-Planck Institute for Chemistry, Mainz, Germany
Lawrence Livermore National Laboratory, Livermore, California, USA
National Center for Atmospheric Research, Boulder, Colorado, USA
Hadley Centre, Met Office, Exeter, UK
Max-Planck Institute for Meteorology, Hamburg, Germany
Service d'Aéronomie/Institut Pierre-Simon Laplace, Paris, France
CIRES/NOAA Aeronomy Laboratory, Boulder, Colorado, USA
Laboratoire des Sciences du Climat et de l'Environnement/Institut Pierre-Simon Laplace, Gif sur Yvette, France
National Center for Atmospheric Research, Boulder, Colorado, USA
National Center for Atmospheric Research, Boulder, Colorado, USA
Geophysical Fluid Dynamics Laboratory/NOAA, Princeton, New Jersey, USA
Max-Planck Institute for Chemistry, Mainz, Germany
National Center for Atmospheric Research, Boulder, Colorado, USA
National Center for Atmospheric Research, Boulder, Colorado, USA
Earth System Science, University of California, Irvine, California, USA
National Center for Atmospheric Research, Boulder, Colorado, USA
Lawrence Livermore National Laboratory, Livermore, California, USA
NASA Goddard Institute for Space Studies, New York, New York, USA
National Center for Atmospheric Research, Boulder, Colorado, USA
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 NOx (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.
Citation: (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.
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