Global patterns of nitrate isotope composition in rivers and adjacent aquifers reveal reactive nitrogen cascading
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Published:2021-03-01
Issue:1
Volume:2
Page:
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ISSN:2662-4435
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Container-title:Communications Earth & Environment
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language:en
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Short-container-title:Commun Earth Environ
Author:
Matiatos IoannisORCID, Wassenaar Leonard I., Monteiro Lucilena R.ORCID, Venkiteswaran Jason J.ORCID, Gooddy Daren C.ORCID, Boeckx PascalORCID, Sacchi ElisaORCID, Yue Fu‐Jun, Michalski Greg, Alonso-Hernández Carlos, Biasi ChristinaORCID, Bouchaou Lhoussaine, Edirisinghe Nandana V., Fadhullah Widad, Fianko Joseph R., García-Moya Alejandro, Kazakis Nerantzis, Li Si-Liang, Luu Minh T. N., Priyadarshanee Sakhila, Re VivianaORCID, Rivera Diego S.ORCID, Romanelli Asunción, Sanyal Prasanta, Tamooh Fredrick, Trinh Duc A., Walters Wendell, Welti Nina
Abstract
AbstractRemediation 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.
Publisher
Springer Science and Business Media LLC
Subject
General Earth and Planetary Sciences,General Environmental Science
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