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Modelling the effects of ‘coastal’ acidification on copper speciation

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  • Richards, Russell
  • Chaloupka, Milani
  • Sanò, Marcello
  • Tomlinson, Rodger

Abstract

We present here a copper speciation model that accounts for the long-term (‘coastal-acidification’) and short-term (daily and seasonal variation) variability in water pH and water temperature. The developed model is applied to a sub-tropical estuary (Moreton Bay, Australia) at a one hundred year time scale so that outputs are consistent with climate change projections. The model predicts that the mean cupric ion concentration (Cu2+) in the estuary will increase by 115% over the next 100 years as a result of the projected decrease in pH and increase in water temperature. Through calibration, the estimated concentration of copper-complexing dissolved organic matter (DOM) in the estuary is found to be 22.5nM. An increase in the concentration of Cu2+, which is the most toxic and bioavailable form of copper, has implications for ecosystem health and may have a negative effect on the detoxifying capacity of DOM. Models that provide a framework for coupling biological, chemical and physical processes are important for providing a holistic perspective of coastal systems, especially for better understanding a system within the context of climatic and non-climatic drivers.

Suggested Citation

  • Richards, Russell & Chaloupka, Milani & Sanò, Marcello & Tomlinson, Rodger, 2011. "Modelling the effects of ‘coastal’ acidification on copper speciation," Ecological Modelling, Elsevier, vol. 222(19), pages 3559-3567.
    • Handle: RePEc:eee:ecomod:v:222:y:2011:i:19:p:3559-3567
    DOI: 10.1016/j.ecolmodel.2011.08.017
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    1. Jason M. Hall-Spencer & Riccardo Rodolfo-Metalpa & Sophie Martin & Emma Ransome & Maoz Fine & Suzanne M. Turner & Sonia J. Rowley & Dario Tedesco & Maria-Cristina Buia, 2008. "Volcanic carbon dioxide vents show ecosystem effects of ocean acidification," Nature, Nature, vol. 454(7200), pages 96-99, July.
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    3. James C. Orr & Victoria J. Fabry & Olivier Aumont & Laurent Bopp & Scott C. Doney & Richard A. Feely & Anand Gnanadesikan & Nicolas Gruber & Akio Ishida & Fortunat Joos & Robert M. Key & Keith Lindsay, 2005. "Anthropogenic ocean acidification over the twenty-first century and its impact on calcifying organisms," Nature, Nature, vol. 437(7059), pages 681-686, September.
    4. Ken Caldeira & Michael E. Wickett, 2003. "Anthropogenic carbon and ocean pH," Nature, Nature, vol. 425(6956), pages 365-365, September.
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