Climate variability and forecasting surface water recovery from acidification: modelling drought-induced sulphate release from wetlands

The Science of the Total Environment
Julian AhernePeter J Dillon

Abstract

Climate-induced drought events have been shown to have a significant influence on sulphate (SO(4)(2-)) export from forested catchments in central Ontario, subsequently delaying recovery of surface waters from acidification. Field and modelling studies have demonstrated that water table drawdown during drought periods promotes oxidation of previously stored (reduced) sulphur (S) compounds in wetlands, with subsequent efflux of SO(4)(2-) upon re-wetting. Although climate-induced changes in processes are generally not integrated into soil-acidification models, MAGIC (Model of Acidification of Groundwater in Catchments) includes a wetland compartment that incorporates redox processes driven by drought events. The potential confounding influence of climate-induced drought events on acidification recovery at Plastic Lake, south-central Ontario (under proposed future S emission reductions) was investigated using MAGIC and two climate scenarios: monthly precipitation and runoff based on long-term means (average-climate scenario), and variable precipitation and runoff based on the past 20 years of observed monthly data (variable-climate scenario). The variable-climate scenario included several periods of summer drought owing to lower th...Continue Reading

References

Dec 3, 2004·Environmental Science & Technology·H LaudonD S Jeffries
Mar 11, 2005·Environmental Science & Technology·Richard F WrightWolfgang Schöpp
Aug 9, 2005·Environmental Science & Technology·Carl-Magnus MörthReiner Giesler
Apr 4, 2006·The Science of the Total Environment·Andrew J Wade

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Citations

May 23, 2009·Environmental Science and Pollution Research International·Petr PorcalPeter J Dillon
Jan 2, 2013·The Science of the Total Environment·Cecilia AkselssonSofie Hellsten
Aug 2, 2015·The Science of the Total Environment·Christopher L Shope, Cory E Angeroth
Jul 15, 2011·The Science of the Total Environment·Sarah TweedDonna Smithyman
May 16, 2006·The Science of the Total Environment·Andrew J Wade
Jul 31, 2013·The Science of the Total Environment·Lei DuanThorjørn Larssen
Apr 11, 2017·The Science of the Total Environment·Zhenhua ZouK David Hambright
Sep 8, 2009·Environmental Science & Technology·Colin J WhitfieldShaun A Watmough
May 29, 2018·The Science of the Total Environment·Nian XuAndrew W Rate

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