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    Variations in the predicted spatial distribution of atmospheric nitrogen deposition and their impact on carbon uptake by terrestrial ecosystems

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    Authors
    Holland, E.A.
    Braswell, B.H.
    Lamarque, J.-F.
    Townsend, A.
    Sulzman, J.
    Müller, J.-F.
    Dentener, F.
    Brasseur, G.
    Levy, H.
    Penner, J.E.
    Roelofs, G.-J.
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    Discipline
    Earth and related Environmental sciences
    Subject
    carbon uptake
    global carbon cycle
    nitrogen deposition
    spatial distribution
    terrestrial ecosystem
    Audience
    Scientific
    Date
    1997
    Metadata
    Show full item record
    Description
    Widespread mobilization of nitrogen into the atmosphere from industry, agriculture, and biomass burning and its subsequent deposition have the potential to alleviate nitrogen limitation of productivity in terrestrial ecosystems, and may contribute to enhanced terrestrial carbon uptake. To evaluate the importance of the spatial distribution of nitrogen deposition for carbon uptake and to better quantify its magnitude and uncertainty NOy-N deposition fields from five different three-dimensional chemical models, GCTM, GRANTOUR, IMAGES, MOGUNTIA, and ECHAM were used to drive NDEP, a perturbation model of terrestrial carbon uptake. Differences in atmospheric sources of NOx-N, transport, resolution, and representation of chemistry, contribute to the distinct spatial patterns of nitrogen deposition on the global land surface; these differences lead to distinct patterns of carbon uptake that vary between 0.7 and 1.3 Gt C yr-1 globally. Less than 10% of the nitrogen was deposited on forests which were most able to respond with increased carbon storage because of the wide C:N ratio of wood as well as its long lifetime. Addition of NHx-N to NOy-N deposition, increased global terrestrial carbon storage to between 1.5 and 2.0 Gt C yr-1 , while the "missing terrestrial sink" is quite similar in magnitude. Thus global air pollution appears to be an important influence on the global carbon cycle. If N fertilization of the terrestrial biosphere accounts for the "missing" C sink or a substantial portion of it, we would expect significant reductions in its magnitude over the next century as terrestrial ecosystems become N saturated and O3 pollution expands.
    Citation
    Holland, E.A.; Braswell, B.H.; Lamarque, J.-F.; Townsend, A.; Sulzman, J.; Müller, J.-F.; Dentener, F.; Brasseur, G.; Levy, H.; Penner, J.E.; Roelofs, G.-J. (1997). Variations in the predicted spatial distribution of atmospheric nitrogen deposition and their impact on carbon uptake by terrestrial ecosystems. , Journal of Geophysical Research Atmospheres, Vol. 102, Issue 13, 15849-15866, DOI: 10.1029/96JD03164.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/5477
    doi: http://dx.doi.org/10.1029/96JD03164
    scopus: 2-s2.0-0031444331
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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