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Bioavailability of dissolved organic matter varies with anthropogenic landcover in the Upper Mississippi River Basin

https://doi.org/10.1016/j.watres.2022.119357

Vaughn, Derrick R.; Kellerman, Anne M.; Wickland, Kimberly P.; Striegl, Robert G.; Podgorski, David C.; Hawkings, Jon R.; Nienhuis, Jaap H.; Dornblaser, Mark M.; Stets, Edward G.; Spencer, Robert G.M. (February 2023, Water Research)

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Recent trends in the chemistry of major northern rivers signal widespread Arctic change

https://doi.org/10.1038/s41561-023-01247-7

Tank, Suzanne E.; McClelland, James W.; Spencer, Robert G.; Shiklomanov, Alexander I.; Suslova, Anya; Moatar, Florentina; Amon, Rainer M.; Cooper, Lee W.; Elias, Greg; Gordeev, Vyacheslav V.; et al (July 2023, Nature Geoscience)

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Permafrost Landscape History Shapes Fluvial Chemistry, Ecosystem Carbon Balance, and Potential Trajectories of Future Change

https://doi.org/10.1029/2022GB007403

Zolkos, Scott; Tank, Suzanne E.; Kokelj, Steven V.; Striegl, Robert G.; Shakil, Sarah; Voigt, Carolina; Sonnentag, Oliver; Quinton, William L.; Schuur, Edward A.; Zona, Donatella; et al (September 2022, Global Biogeochemical Cycles)

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Anthropogenic landcover impacts fluvial dissolved organic matter composition in the Upper Mississippi River Basin

https://doi.org/10.1007/s10533-021-00852-1

Vaughn, Derrick R.; Kellerman, Anne M.; Wickland, Kimberly P.; Striegl, Robert G.; Podgorski, David C.; Hawkings, Jon R.; Nienhuis, Jaap H.; Dornblaser, Mark M.; Stets, Edward G.; Spencer, Robert G. (July 2021, Biogeochemistry)

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Potential impacts of mercury released from thawing permafrost

https://doi.org/10.1038/s41467-020-18398-5

Schaefer, Kevin; Elshorbany, Yasin; Jafarov, Elchin; Schuster, Paul F.; Striegl, Robert G.; Wickland, Kimberly P.; Sunderland, Elsie M. (September 2020, Nature Communications)

Abstract Mercury (Hg) is a naturally occurring element that bonds with organic matter and, when converted to methylmercury, is a potent neurotoxicant. Here we estimate potential future releases of Hg from thawing permafrost for low and high greenhouse gas emissions scenarios using a mechanistic model. By 2200, the high emissions scenario shows annual permafrost Hg emissions to the atmosphere comparable to current global anthropogenic emissions. By 2100, simulated Hg concentrations in the Yukon River increase by 14% for the low emissions scenario, but double for the high emissions scenario. Fish Hg concentrations do not exceed United States Environmental Protection Agency guidelines for the low emissions scenario by 2300, but for the high emissions scenario, fish in the Yukon River exceed EPA guidelines by 2050. Our results indicate minimal impacts to Hg concentrations in water and fish for the low emissions scenario and high impacts for the high emissions scenario.
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