Kejimkujik calibrated catchments: A benchmark dataset for long‐term impacts of terrestrial and freshwater acidification

Sterling, Shannon; Clair, Thomas A.; Rotteveel, Lobke; O’Driscoll, Nelson J.; Houle, Daniel; Halfyard, Edmund A.; Keys, Kevin

doi:10.1002/hyp.14477

Cited by 2 publications

(1 citation statement)

References 55 publications

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“…The monitoring data demonstrate strong chemical recovery from acidification at Langtjern, similar to other strongly acidified surface waters in Norway (De Wit et al 2023), elsewhere in Europe and North America (Bukaveckas 2021;Garmo et al 2014;Houle et al 2022;Kopacek et al 2021;Lawrence et al 2021;Sterling et al 2022) and in Japan (Sase et al 2021). Simultaneously, DOC at Langtjern has increased and now contributes more to the total anion charge in the streamwater than the strong acid anions.…”

Section: Discussionmentioning

confidence: 56%

Transitioning from anthropogenic to natural acidification in a humic catchment in Norway: projections of deposition and climate change effects

Wit,

Clayer,

Kaste

et al. 2023

Preprint

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Five decades of monitoring data (1974-2022) at the acidified, acid-sensitive forested catchment of Langtjern in southern Norway document strong chemical recovery and browning of surface water, related to changes in sulfur (S) deposition. We used the process-oriented model MAGIC to simulate water chemistry from 1860 to 2100 using historical and projected deposition and climate. New in MAGIC is i) a solubility control of dissolved organic carbon (DOC) from S deposition, which allows inclusion of the changing role of organic acids in chemical recovery, and ii) climate-dependency of weathering rates. MAGIC successfully described measured chemical recovery and browning, and the change towards organic acid dominated acidification status. Hindcasts of pH suggested lower preindustrial pH than previously modelled with MAGIC, simulated without sulfate-dependency of DOC solubility. Climate scenarios indicated substantially wetter climate, leading to increased base cation losses and slight reacidification of the surface waters. A sensitivity analysis of weathering rates revealed that a doubling of weathering rates is needed to reach pre-industrial ANC in 2100, given that S deposition is expected to be reduced to a minimum. We conclude that impacts of climate change are most likely to lead to slight reacidification of surface waters, and that enhanced weathering rates could partly compensate this trend.

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Section: Discussionmentioning

confidence: 56%

Transitioning from anthropogenic to natural acidification in a humic catchment in Norway: projections of deposition and climate change effects

Wit,

Clayer,

Kaste

et al. 2023

Preprint

View full text Add to dashboard Cite

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From anthropogenic toward natural acidification: Effects of future deposition and climate on recovery in a humic catchment in Norway

de Wit,

Clayer,

Kaste

et al. 2024

Ecological Research

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Five decades of monitoring data (1974–2022) at the acidified forested catchment of Langtjern in southern Norway document strong chemical recovery and browning of surface water, related to changes in sulfur (S) deposition. Further recovery is likely to be impacted by future air quality and climate, through catchment processes sensitive to climate change, where the relative importance of these drivers of recovery is poorly known. Here, we explore the importance of the aforementioned drivers for recovery using the well‐established process‐oriented Model of Acidification of Groundwater In Catchments (MAGIC) with historical and projected deposition and climate from 1860 to 2100. New in MAGIC are (i) a solubility control of dissolved organic carbon (DOC) from S deposition, which allows inclusion of the role of organic acids in chemical recovery and (ii) climate‐dependency of weathering rates. MAGIC successfully described observed chemical recovery and browning, and the change toward organic acid dominated acidification status. Hindcasts of pH predicted lower preindustrial pH than previously modeled with MAGIC (simulated without S‐dependency of DOC solubility). Future deposition resulted in limited further recovery. Climate scenarios indicated a substantially wetter future, leading to increased base cation losses and slight surface water reacidification. A sensitivity analysis revealed that a 25%–50% increase of weathering rates was needed to reach preindustrial acid‐neutralizing capacity in 2100, provided S deposition is reduced to a minimum. We predict that the limited chemical recovery from reduced S deposition will be counteracted by climate‐driven reacidification from base cation losses, but that enhanced weathering rates could partly compensate these losses.

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Kejimkujik calibrated catchments: A benchmark dataset for long‐term impacts of terrestrial and freshwater acidification

Cited by 2 publications

References 55 publications

Transitioning from anthropogenic to natural acidification in a humic catchment in Norway: projections of deposition and climate change effects

Transitioning from anthropogenic to natural acidification in a humic catchment in Norway: projections of deposition and climate change effects

From anthropogenic toward natural acidification: Effects of future deposition and climate on recovery in a humic catchment in Norway

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