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- W2026513778 abstract "Riverine dissolved sulfate (SO42–) flux and sulfur stable isotope composition (δ34S) yield information on the sources and processes affecting sulfur cycling on different spatial and temporal scales. However, because pristine preindustrial natural baselines of riverine SO42– flux and δ34S cannot be directly measured, anthropogenic impact remains largely unconstrained. Here we quantify natural and anthropogenic SO42– flux and δ34S for North America’s largest river, the Mississippi, by means of an exhaustive source compilation and multiyear monitoring. Our data and analysis show that, since before industrialization to the present, Mississippi River SO42– has increased in flux from 7.0 to 27.8 Tg SO42– yr–1, and in mean δ34S from −5.0‰, within 95% confidence limits of −14.8‰ to 4.1‰ (assuming normal distribution for mixing model input parameters), to −2.7 ± 1.6‰, reflecting an impressive footprint of bedrocks particular to this river basin and human activities. Our first-order modern Mississippi River sulfate partition is 25 ± 6% natural and 75% ± 6% anthropogenic sources. Furthermore, anthropogenic coal usage is implicated as the dominant source of modern Mississippi River sulfate, with an estimated 47 ± 5% and 13% of total Mississippi River sulfate due to coal mining and burning, respectively." @default.
- W2026513778 created "2016-06-24" @default.
- W2026513778 creator A5040807411 @default.
- W2026513778 creator A5065333540 @default.
- W2026513778 date "2015-04-07" @default.
- W2026513778 modified "2023-10-16" @default.
- W2026513778 title "Significant Human Impact on the Flux and δ<sup>34</sup>S of Sulfate from the Largest River in North America" @default.
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- W2026513778 doi "https://doi.org/10.1021/es504498s" @default.
- W2026513778 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25803121" @default.
- W2026513778 hasPublicationYear "2015" @default.
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