Possible Impacts of Climate Change on Daily Streamflow and Extremes at Local Scale in Ontario, Canada. Part II: Future Projection — Oak Academic Publishing
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Possible Impacts of Climate Change on Daily Streamflow and Extremes at Local Scale in Ontario, Canada. Part II: Future Projection
Science Section, Operations—Ontario, Meteorological Service of Canada, Environment Canada, Toronto, Canada
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Science Section, Operations—Ontario, Meteorological Service of Canada, Environment Canada, Toronto, Canada
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Science Section, Operations—Ontario, Meteorological Service of Canada, Environment Canada, Toronto, Canada
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Adaptation and Impacts Research Division, Science and Technology Branch, Environment Canada, Toronto, Canada
1 Science Section, Operations—Ontario, Meteorological Service of Canada, Environment Canada, Toronto, Canada
2 Science Section, Operations—Ontario, Meteorological Service of Canada, Environment Canada, Toronto, Canada
3 Science Section, Operations—Ontario, Meteorological Service of Canada, Environment Canada, Toronto, Canada
4 Adaptation and Impacts Research Division, Science and Technology Branch, Environment Canada, Toronto, Canada
The paper forms the second part of an introduction to possible impacts of climate change on daily streamflow and extremes in the Province of Ontario, Canada. Daily streamflow simulation models developed in the companion paper (Part I) were used to project changes in frequency of future daily streamflow events. To achieve this goal, future climate information (including rainfall) at a local scale is needed. A regression-based downscaling method was employed to downscale eight global climate model (GCM) simulations (scenarios A2 and B1) to selected weather stations for various meteorological variables (except rainfall). Future daily rainfall quantities were projected using daily rainfall simulation models with downscaled future climate information. Following these projections, future daily streamflow volumes can be projected by applying daily streamflow simulation models. The frequency of future daily high-streamflow events in the warm season (May–November) was projected to increase by about 45%-55% late this century from the current condition, on average of eight-GCM A2 projections and four selected river basins. The corresponding increases for future daily low-streamflow events and future daily mean streamflow volume could be about 25%-90% and 10%-20%, respectively. In addition, the return values of annual one-day maximum streamflow volume for various return periods were projected to increase by 20%-40%, 20%-50%, and 30%-80%, respectively for the periods 2001-50, 2026-75, and 2051-2100. Inter-GCM and interscenario uncertainties of future streamflow projections were quantitatively assessed. On average, the projected percentage increases in frequency of future daily high-streamflow events are about 1.4-2.2 times greater than inter-GCM and interscenario uncertainties.
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