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    The regional and global significance of nitrogen removal in lakes and reservoirs

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    Lake_Reservoir_TN_Removal_Revised_6.pdf (483.2Kb)
    Date
    2008-06-25
    Author
    Harrison, John A.  Concept link
    Maranger, Roxane J.  Concept link
    Alexander, Richard B.  Concept link
    Giblin, Anne E.  Concept link
    Jacinthe, Pierre-Andre  Concept link
    Mayorga, Emilio  Concept link
    Seitzinger, Sybil P.  Concept link
    Sobota, Daniel J.  Concept link
    Wollheim, Wilfred M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3097
    As published
    https://doi.org/10.1007/s10533-008-9272-x
    Abstract
    Human activities have greatly increased the transport of biologically available N through watersheds to potentially sensitive coastal ecosystems. Lentic water bodies (lakes and reservoirs) have the potential to act as important sinks for this reactive N as it is transported across the landscape because they offer ideal conditions for N burial in sediments or permanent loss via denitrification. However, the patterns and controls on lentic N removal have not been explored in great detail at large regional to global scales. In this paper we describe, evaluate, and apply a new, spatially explicit, annual-scale, global model of lentic N removal called NiRReLa (Nitrogen Retention in Reservoirs and Lakes). The NiRReLa model incorporates small lakes and reservoirs than have been included in previous global analyses, and also allows for separate treatment and analysis of reservoirs and natural lakes. Model runs for the mid-1990s indicate that lentic systems are indeed important sinks for N and are conservatively estimated to remove 19.7 Tg N yr-1 from watersheds globally. Small lakes (< 50 km2) were critical in the analysis, retaining almost half (9.3 Tg N yr-1) of the global total. In model runs, capacity of lakes and reservoirs to remove watershed N varied substantially (0-100%) both as a function of climate and the density of lentic systems. Although reservoirs occupy just 6% of the global lentic surface area, we estimate they retain approximately 33% of the total N removed by lentic systems, due to a combination of higher drainage ratios (catchment surface area : lake or reservoir surface area), higher apparent settling velocities for N, and greater N loading rates in reservoirs than in lakes. Finally, a sensitivity analysis of NiRReLa suggests that, on-average, N removal within lentic systems will respond more strongly to changes in land use and N loading than to changes in climate at the global scale.
    Description
    Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Biogeochemistry 93 (2009): 143-157, doi:10.1007/s10533-008-9272-x.
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    • Ecosystems Center
    Suggested Citation
    Preprint: Harrison, John A., Maranger, Roxane J., Alexander, Richard B., Giblin, Anne E., Jacinthe, Pierre-Andre, Mayorga, Emilio, Seitzinger, Sybil P., Sobota, Daniel J., Wollheim, Wilfred M., "The regional and global significance of nitrogen removal in lakes and reservoirs", 2008-06-25, https://doi.org/10.1007/s10533-008-9272-x, https://hdl.handle.net/1912/3097
     
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