PRESENTATION OF C-CIARN BRITISH COLUMBIA Stewart J Cohen

PRESENTATION OF C-CIARN BRITISH COLUMBIA Stewart J. Cohen, Ph. D. 1) Adaptation & Impacts Research Group (AIRG), Meteorological Service of Canada, Environment Canada 2) Institute for Resources, Environment & Sustainability University of British Columbia, Vancouver Presented to the Senate Standing Committee on Forestry and Agriculture, Ottawa, Feb. 4, 2003.

Summary of Briefing • Temperature and precipitation have increased in British Columbia • Observed warming has affected growing season length and the mountain pine beetle • Projected impacts include continued lengthening of the growing season, increased crop water demand, and increased risk of fire and pest infestations • Important regional concerns include N. E. BC forests, agriculture in the Okanagan, flood risks in the Georgia Basin, and fisheries & coastal erosion in coastal areas • More research is needed to better understand adaptation to climate change, and how this could affect resource management & regional development—a role for CCIARN B. C.

Outline of Presentation • Climate trends in British Columbia • Climate Impacts & Adaptation Assessment – cases from B. C. – Okanagan/Columbia: water, agriculture and other users – Forestry: pests, fire • Expanding the Dialogue on Climate Impacts & Adaptation—C-CIARN B. C.

Average temperatures are increasing in BC Change in temperature over 20 th Century ( °C/100 years) Source: BC Ministry of Water, Land Air Protection – Environmental Trends, 2000 www. gov. bc. ca/wlap

Nighttime minimum temperatures are rising faster than daytime maximums. Source: BC Ministry of Water, Land Air Protection – Environmental Trends, 2000 www. gov. bc. ca/wlap

Glaciers in retreat Source: IPCC, Third Assessment Report, 2001

Precipitation has increased in southern BC Change in precipitation over 20 th Century ( %/decade) Source: BC Ministry of Water, Land Air Protection – Environmental Trends, 2000 www. gov. bc. ca/wlap

Lake & river ice is melting earlier in northern and interior BC Change in date of first melt, 1945 -1993 ( days/decade) Source: BC Ministry of Water, Land Air Protection – Environmental Trends, 2000 www. gov. bc. ca/wlap

Water Management & Climate Change in the Okanagan/Columbia

Water Resources in the Columbia River Basin System objectives affected by winter flows Winter hydropower production (PNW demand) System objectives affected by summer flows Flood control Summer hydropower production (California demand) Irrigation Instream flow for fish Recreation Source: Alan Hamlet University of Washington

Columbia Basin Impacts of Climate Change on Streamflow • Less snow, earlier melt means less water in summer – – irrigation urban uses fisheries protection energy production • More water in winter – energy production – flooding Natural Columbia River flow at the Dalles, Oregon Source: P. Mote, University of Washington

Will the Columbia Basin System meet its Water Management Objectives in the 2040 s? Source: Alan Hamlet University of Washington

Okanagan Climate Change Scenario: Implications for Water Management

Projected changes in Growing Degree Days (> 5 C) Kelowna Airport (Brewer & Taylor, 2001)

Irrigation district Reported Allocation Use 1996 -99 Crop water demand Source 1961 -1990 2069 -2090 Oliver 75. 4 26. 1 21. 6 29. 4 Main channel Penticton 8. 0 7. 4 6. 6 9. 1 Tributary + Main Summerland 20. 9 9. 7 13. 7 19. 1 Tributary Naramata 13. 6 1. 9 3. 7 4. 9 Tributary Source: Denise Neilsen, Agriculture & Agrifood Canada

Overview of Okanagan study catchments Dave’s Cr. (31 km 2) Whiteman Cr. (114 km 2) Pearson Cr. (73 km 2) Camp Cr. (34 km 2) Bellevue Cr. (78 km 2) Vaseux Cr. (117 km 2)

Intra-annual flow variability (Dave’s Cr. )

Intra-annual flow variability (Whiteman Cr)

Stakeholder views on adaptation Engaging dialogue to identify adaptation strategies to scenarios of streamflow reductions during the growing season in the Okanagan Basin èadaptation dialogue is just beginning. . . Preferred adaptation options among the stakeholders? Structural (e. g. building upland dams) and social measures (e. g. , buy out water licenses) preferred over institutional measures Some implications of their choices? Stakeholders identified the high cost of dams, associated impacts on fisheries, and difficulties in restricting development as possible implications of their adaptation choices. Web site: http: //www. sdri. ubc. ca/publications

Water Management & Climate Change in the Okanagan—Study Framework

Forest Management & Climate Change in Interior and Northern British Columbia

2001: Mountain pine beetle damage

-40 BRITISH COLUMBIA ALBERTA Mountain Pine Beetle – limits • Cool summers • Winter minimums (below -40°C) Source: Allan Carroll Canadian Forest Service

10 1500 1250 8 1000 6 750 4 500 2 250 0 1910 MPB outbreak area (ha × 103) Area of susceptible pine (ha × 106) Areas of susceptible pine and Mountain Pine Beetle (MPB) infestation since 1910 • Frequent large-scale MPB outbreaks during last century • Size of outbreaks correlated with increase in susceptible pine 0 1930 1950 1970 Year 1990 2010 Source: Allan Carroll Canadian Forest Service

Climatically suitable habitat for the mountain pine beetle 1941 - 1970 1971 - 2000 Climatic suitability 2001 - 2030 2031 - 2060 Very low Low Moderate High Extreme Source: Allan Carroll Canadian Forest Service

Scenario changes to fire weather, BC and Alberta (Mackenzie Basin Impact Study, 1997) 1980 s 2050 s

In SE B. C. , Lodgepole Pine seedlings can achieve greater yield if planted at elevations higher than their origin! Source: Greg O’Neill, BCMOF

Research has identified some important potential impacts forestry and agriculture in British Columbia • BC is already experiencing climate change • Glaciers are receding, affecting summertime water supply • Future water supply will be affected by changes in timing of snowmelt; watersheds will likely have more water in winter and less in summer • Growing seasons will lengthen and become warmer • Forest pest and fire risks will likely increase in interior BC, and expand to higher elevations and latitudes

Impacts & Adaptation Research in British Columbia: Important New Questions • How will water supply and demand change? – Increasing population and changes in land use may limit our ability to adapt to water supply changes. – Climate change may constrain possible adaptation strategies, such as expanded irrigation, and controlled reservoir releases to support fisheries and electric power production. • How will climate change alter forest management? – Reforestation plans have to consider climate changes over the lifetime of newly planted trees. – What will future harvest levels be, and can they sustain communities? • How will climate risks change for communities? – Are businesses and governments making planning and management decisions based on the assumption that climate will not change? – How can uncertain climate “scenarios” be incorporated into assessments of risks and opportunities?

C-CIARN B. C. is Expanding the Dialogue on Climate Impacts & Adaptation • C-CIARN BC and partners are holding workshops with academic researchers – UBC, Okanagan College, University of Victoria, Malaspina College, Simon Fraser University • C-CIARN BC and partners are initiating dialogue with stakeholders throughout BC – Columbia Basin (Cranbrook), northern BC (UNBC and region) • Through this process, stakeholders and researchers are raising concerns about: – Need for expanded monitoring programs – Vulnerability of regional economies and questions about adaptation options – Concerns about impacts on health and lifestyle – Unknown potential for “surprise” impacts

C-CIARN BC is Promoting New Research Opportunities in Climate Impacts & Adaptation • Encourage stakeholder participation in earliest phases of impacts/adaptation research. – Promotes interdisciplinary collaboration and the application of local knowledge and experience • Identify potential new vulnerabilities or adaptation opportunities that should be studied. – Adapting to climate change is about becoming more resilient to current and future climate variability and risks

C-CIARN B. C. Advisory Committee Affiliates: Agriculture and Agrifood Canada (AAFCa) BC Hydro Canadian Association of Physicians for the Environment Canadian Columbia River Inter-Tribal Fisheries Commission Community Representative (East Kootenays) Environment Canada (EC) Greater Vancouver Regional District (GVRD) Ministry of Water Land Air Protection (MWLAP) Okanagan University College (OUC) Royal Roads University (RRU) Simon Fraser University (SFU) University of British Columbia (UBC) University of Northern British Columbia (UNBC) University of Victoria (UVic)

More information: http: //britishcolumbia. c-ciarn. ca Contact: c-ciarn-bc@ires. ubc. ca