Modelling the effects of climate change on methane emission from a northern ombrotrophic bog in Canada |
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| Authors: | Derrick Y F Lai |
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| Institution: | (1) Department of Geography, McGill University, 805 Sherbrooke Street West, Montreal, QC, H3A 2K6, Canada |
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| Abstract: | Peatlands are a large potential source of methane (CH4) to the atmosphere. In order to investigate the effects of climate change on CH4 emission from northern ombrotrophic peatlands, a simulation model coupling water table dynamics with methane emission was
developed for the Mer Bleue Bog in Ontario, Canada. The model was validated against reported values of CH4 flux from field measurements and the model outputs exhibited high sensitivity to acrotelm thickness, leaf area index, transmissivity
and slope of water table. With a 2–4°C temperature rise over the 4-year simulation period, the rate of CH4 release dropped significantly to under 0.1 mg m−2 day−1. On the other hand, mean CH4 emission increased by >26-fold when the increase in precipitation was >15%. When looking at the combined effects, the highest
CH4 release (13.3 mg m−2 day−1) was attained under the scenario of 2°C temperature rise and 25% precipitation increase. Results obtained in this study highlight
the importance of avoiding more extreme climate change, which would otherwise lead to enhanced methane release from peatlands
and further atmospheric warming through positive feedback. |
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| Keywords: | Canada Climate change Methane Modelling Peatland |
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