The scale of the UVic contribution reflects the university’s unusual concentration of climate expertise. Xuebin Zhang, director of the Pacific Climate Impacts Consortium, or PCIC, served on the report’s steering committee and its science advisory committee, helping shape the scope and scientific standards of the entire assessment. Roberta Hamme, director of UVic’s School of Earth and Ocean Sciences, and Francis Zwiers, scientist emeritus and former director of PCIC, served as co-ordinating lead authors on two of the report’s most consequential chapters, covering changes in the oceans and changes in Canada’s climate over time, respectively. Co-ordinating lead authors carry particular responsibility in national assessments: they oversee the drafting of chapter text, ensure that every statement traces back to peer-reviewed evidence, and reconcile the perspectives of dozens of contributing scientists into a single coherent narrative.

PCIC, based at UVic, provided much of the analytical backbone for the temperature, precipitation and extremes chapters. According to Zhang, the consortium’s scientific capacity and its world-calibre services added both data and analysis to the report, with rigorous physical science underpinning detailed assessments of past and future changes in Canadian climate, including temperature, flood, drought and fire. That kind of work involves downscaling global climate model output to regional and local scales, correcting for biases in observational records, and quantifying uncertainty so that projections are useful rather than merely alarming. Zhang emphasizes that the report is the most up-to-date assessment of how Canada’s climate is changing and why, and how it is expected to change in the future. The regional data and analysis provided by the consortium’s researchers, he notes, offer information that is directly relevant to regional and local decision makers, helping them understand the risks they face and prepare for future changes.

One of the report’s most striking findings concerns the pace of warming in Canada’s North. Like other Arctic regions of the world, Canada’s northern territories are warming much more quickly than the rest of the country, a phenomenon consistent with theoretical expectations of how a warming world behaves. Arctic amplification, driven in part by the loss of reflective snow and sea ice that once bounced sunlight back to space, means that the most dramatic temperature increases are occurring in regions where permafrost, ice roads and traditional Indigenous livelihoods are acutely sensitive to thaw. The same northern regions are also receiving more precipitation, another signal that matches what physical climate theory predicts as a warmer atmosphere holds more water vapour. British Columbia, PCIC’s primary regional focus, has experienced changes similar to those seen across most of Canada, tying the province’s experience to the national pattern.

A major technical advance in the 2026 report is its extension of Canada’s warming record back before the era of reliable nationwide measurements. Systematic national coverage of weather observations in Canada only became available in 1948, which has long limited assessments to roughly the postwar period. In the new report, however, scientists were able to estimate how much the country has warmed not just since 1948 but since the 1850 to 1900 preindustrial baseline, the reference period used in international climate targets. This was achieved despite Canada having only a smattering of meteorological observing stations prior to 1900. The breakthrough came thanks to Tong Li, a PCIC postdoctoral fellow, who developed sophisticated methods of combining the sparse available observations with results from climate models, filling the gaps in the historical record with statistically defensible estimates.

That methodological achievement matters because the preindustrial baseline is the yardstick against which global warming limits are measured. Without a credible estimate of nineteenth-century conditions, Canadian warming cannot be placed in the same frame as international targets or compared cleanly with other countries’ assessments. By blending observations with model-based reconstructions, the new analysis gives Canadian policymakers a longer and more complete trajectory of national warming, strengthening both attribution statements about the human role in observed change and projections of what further emissions will bring. The report’s synthesis chapter, led by Zwiers, provides an overall assessment of observed changes in Canada’s climate, detailed evaluations of temperature and precipitation trends, and an explicit accounting of how much human influence on the climate system has contributed to those changes.

The ocean chapter, co-ordinated by Hamme, documents equally profound changes in the waters surrounding the country. Canada’s oceans have warmed and become more acidic because of excess carbon dioxide released by human activities, and marine heatwaves are becoming both more frequent and more intense, with consequences for marine ecosystems and the coastal communities that depend on them. The physical chemistry is well understood: the oceans absorb enormous quantities of the energy trapped by greenhouse gases and a substantial share of the carbon dioxide itself, altering seawater temperature and carbonate chemistry in ways that ripple through food webs from plankton to salmon to whales. For coastal British Columbia, where fisheries, aquaculture and coastal infrastructure are tightly linked to ocean conditions, these shifts translate directly into economic and cultural risk.

Hamme frames the ocean’s role in the climate system as both a service and a warning. The oceans perform a great service to humanity, she explains, by absorbing about 90 percent of the excess heat and roughly 25 percent of the excess carbon dioxide generated by human activity, which slows the rate of climate change on land and in the atmosphere. But that buffering comes at a cost. Higher temperatures and more acidic waters affect which plants and animals can thrive in Canadian waters, rising sea levels threaten coastal communities, and more frequent and intense extreme events are harder to recover from. The report, she says, lays out in plain language how Canada is changing and what can be expected in the future depending on the choices society makes, a deliberate attempt to translate dense physical science into terms that planners, elected officials and the public can act upon.

The practical reach of the assessment extends well beyond the scientific community. The 2019 edition of the report served as the authoritative resource on Canada’s changing climate, informing engineering standards, risk assessments and policy debates across the country. The 2026 update is designed to support decision making and adaptive planning at every level, from municipal infrastructure planning and emergency management to Indigenous-led climate adaptation initiatives, water management, coastal resilience programs and updates to building codes. Engineers designing drainage systems need flood projections; health authorities need heat warnings calibrated to a warming baseline; coastal municipalities need sea-level scenarios that account for both global ocean change and local land motion. The report supplies the common evidence base for all of them.

Behind the national assessment stands a broader research enterprise. UVic researchers contribute internationally recognized expertise in climate modelling, ocean science, renewable energy systems, water security, conservation, public policy and climate adaptation, and through 12 research centres and other programs they help communities, governments and industries plan for and respond to climate and environmental change. The 2026 report demonstrates how that expertise scales up: individual scientists contributing chapters, datasets and novel methods combine into a single national picture of a country being reshaped by a changing climate. For Canada, the message of the assessment is unambiguous. The changes are already measured, the human cause is quantified, and the trajectory of the coming decades will depend on emissions choices made now, at home and around the world.

Subject of Research: The role of University of Victoria climate and ocean scientists in Canada's national climate change assessment

Article Title: How UVic researchers are helping Canada understand a changing climate

Article References: How UVic researchers are helping Canada understand a changing climate. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: climate change, Canada's Changing Climate Report 2026, University of Victoria, Pacific Climate Impacts Consortium, ocean warming, ocean acidification, marine heatwaves, Arctic amplification, climate attribution, sea level rise, climate adaptation, extreme heat