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    Item type:Publication,
    ROSA: An Andean Network of Social–Ecological Observatories
    (International Mountain Society (IMS) and United Nations University, 2024-11-07)
    Julieta Carilla
    ;
    Ricardo Grau
    ;
    Oriana Osinaga Acosta
    ;
    Agustina Malizia
    ;
    Sergio Ceballos
    Scopus© Citations 1  8
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    Global patterns of nitrate isotope composition in rivers and adjacent aquifers reveal reactive nitrogen cascading
    (2021)
    Ioannis Matiatos
    ;
    Leonard I. Wassenaar
    ;
    Lucilena R. Monteiro
    ;
    Jason J. Venkiteswaran
    ;
    Daren C. Gooddy
    Remediation of nitrate pollution of Earth’s rivers and aquifers is hampered by cumulative biogeochemical processes and nitrogen sources. Isotopes (δ15N, δ18O) help unravel spatiotemporal nitrogen(N)-cycling of aquatic nitrate (NO3−). We synthesized nitrate isotope data (n = ~5200) for global rivers and shallow aquifers for common patterns and processes. Rivers had lower median NO3− (0.3 ± 0.2 mg L−1, n = 2902) compared to aquifers (5.5 ± 5.1 mg L−1, n = 2291) and slightly lower δ15N values (+7.1 ± 3.8‰, n = 2902 vs +7.7 ± 4.5‰, n = 2291), but were indistinguishable in δ18O (+2.3 ± 6.2‰, n = 2790 vs +2.3 ± 5.4‰, n = 2235). The isotope composition of NO3− was correlated with water temperature revealing enhanced N-cascading in warmer climates. Seasonal analyses revealed higher δ15N and δ18O values in wintertime, suggesting waste-related N-source signals are better preserved in the cold seasons. Isotopic assays of nitrate biogeochemical transformations are key to understanding nitrate pollution and to inform beneficial agricultural and land management strategies. © 2021, The Author(s).
    Scopus© Citations 66  8