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Drivers and evolution of episodic acidification at the Bear Brook Watershed in Maine, USA

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Abstract

Despite decades of research about episodic acidification in many regions of the world, the understanding of what controls the transient changes in stream water chemistry occurring during rain and snow melt events is still limited. Here, we use 20 years of hydrological and stream chemical data from the paired watershed study at Bear Brook Watershed in Maine (BBWM), USA to improve the understanding of the effects of acid deposition on the causes, drivers, and evolution of episodic acidification. The long-term experimental study at BBWM includes 18 years of chemical treatment of the West Bear Brook (WB) watershed with (NH4)2SO4. East Bear Brook (EB) serves as reference. The treatment started in 1989 following a 2-year pretreatment period. We analyzed 212 hydrological episodes using an episode model that can separate and quantify individual drivers of the transient change in acid-neutralizing capacity (ANC) during hydrological events. The results suggest that 18 years of N and S addition have not affected the natural drivers of episodic acidification of base-cation dilution, marine sea salt episodes, or organic acidity during rain and snow melt events. The contribution of SO\(_{4}^{2-}\) to the ANC decline in WB has been increasing linearly since the beginning of watershed treatment, while the role of NO\(_{3}^{-}\) has remained relatively constant after an initial increase. This is contradictory to many previous shorter-term studies and illustrates the need for a more mechanistic understanding of the causes and drivers of episodic acidification during rain- and snow melt-driven hydrological events.

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Authors and Affiliations

  1. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901 83, Umeå, Sweden

    Hjalmar Laudon

  2. Department of Earth Sciences, University of Maine, Orono, ME, 04469-5790, USA

    Stephen A. Norton

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  1. Hjalmar Laudon
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  2. Stephen A. Norton
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Correspondence to Hjalmar Laudon.

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Laudon, H., Norton, S.A. Drivers and evolution of episodic acidification at the Bear Brook Watershed in Maine, USA. Environ Monit Assess 171, 59–69 (2010). https://doi.org/10.1007/s10661-010-1526-0

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