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256388.0 [No comment] 25.04.2006 16:02 Released

ID: 256388.0, MPI für Meteorologie / Atmosphere in the Earth System
Assessing future nitrogen deposition and carbon cycle feedback using a multimodel approach: Analysis of nitrogen deposition
Authors:Lamarque, J. F.; Kiehl, J. T.; Brasseur, G. P.; Butler, T.; Cameron-Smith, P.; Collins, W. D.; Collins, W. J.; Granier, C.; Hauglustaine, D.; Hess, P. G.; Holland, E. A.; Horowitz, L.; Lawrence, M. G.; McKenna, D.; Merilees, P.; Prather, M. J.; Rasch, P. J.; Rotman, D.; Shindell, D.; Thornton, P.
Date of Publication (YYYY-MM-DD):2005-10-05
Title of Journal:Journal of Geophysical Research-Atmospheres
Journal Abbrev.:J. Geophys. Res.-Atmos.
Issue / Number:D19
Sequence Number of Article:D19303
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:nitrogen deposition; carbon cycle; nitrogen oxides; IPCC A2 scenario
External Publication Status:published
Document Type:Article
Communicated by:Carola Kauhs
Affiliations:MPI für Meteorologie/Atmosphere in the Earth System
External Affiliations:Natl Ctr Atmospher Res, Boulder, CO 80305 USA.; Max Planck Inst Chem, D-55128 Mainz, Germany.; Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.; Met Off, Hadley Ctr, Exeter EX1 3PB, Devon, England.; Inst Pierre Simon Laplace, Serv Aeron, Paris, France.; NOAA, CIRES, Aeron Lab, Boulder, CO USA.; Inst Pierre Simon Laplace, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France.; NOAA, Geophys Fluid Dynam Lab, Princeton, NJ 08542 USA.; Univ Calif Irvine, Irvine, CA 92697 USA.; NASA, Goddard Inst Space Studies, New York, NY 10025 USA.
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