Browsing by Author "Yue, Fu-Jun"
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Item Global patterns of nitrate isotope composition in rivers and adjacent aquifers reveal reactive nitrogen cascading(2021) Matiatos, Ioannis; Wassenaar, Leonard; Monteiro, Lucilena R.; Venkiteswaran, Jason J.; Gooddy, Daren C.; Boeckx, Pascal; Sacchi, Elisa; Yue, Fu-Jun; Michalski, Greg; Alonso-Hernández, Carlos; Biasi, Christina; 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, Viviana; Rivera, Diego; Romanelli, Asunción; Sanyal, Prasanta; Tamooh, Fredrick; Trinh, Duc A.; Walters, Wendell; Welti, NinaRemediation 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