What is a glacier?
A glacier is a large body of ice that forms on land where the accumulation of snow and its densification into ice exceeds ablation (melting, sublimation and mechanical calving) over many years. Glaciers slowly deform and flow due to stresses caused by their weight.
Where are glaciers located?
Canada’s landmass and climate supports approximately 20% of the Earth’s glacier ice volume excluding the Antarctic and Greenland ice sheets. Outside of the ice sheets of Antarctica and Greenland, Canada has more glacier coverage in the form of mountain glaciers, icefields and ice caps than any other nation.
In Canada, glaciers and ice caps are found in the Arctic where they occupy ~150,000 km2 of the Queen Elizabeth Islands, Baffin Island, and Bylot Islands, and in the Western and Northern Cordillera region which supports ~50,000 km2 of glacier coverage.
Why monitor glacier change?
Sites in the Canadian Arctic Archipelago are monitored primarily as indicators of climate change and for their contribution to regional and global sea-level changes. Glaciers in this region have become the 3rd largest contributor to global sea-level riseFootnote 1 outside of the Antarctic and Greenland ice sheets. Run-off from glaciers in this region also impact local streamflow and freshwater fluxes into the Arctic Basin.
The Western Cordillera sites are monitored primarily as indicators of climate change and for their contribution to water resources and ecosystem functioning in BC, AlbertaFootnote 2, Yukon and the Northwest Territories, and freshwater fluxes into the Arctic Basin. Glaciers affect the seasonal timing of streamflow, important for communities and water-reliant sectors including hydroelectric power generation and mining.
How are glaciers measured?
Glacier mass balance has been recognized as an “Essential Climate Variable” by the World Meteorological Organization / Global Climate Observing System because it plays an important role in climate change surveillance, understanding sea-level change, and hydrology. NRCan-ESS’s Climate Change Geoscience Program monitors glacier mass balance at reference sites in the Western Cordillera and the Canadian Arctic Archipelago (see map below) with partners and researchers from other Canadian and international government departments and universities.
The key parameter derived from the annual glacier surveys is net surface mass balance (excludes mass loss due to ice-berg calving) which is the sum of ablation, or the total mass loss due to melt and run-off, and accumulation which is the total input to the glacier that comes primarily in the form of snow, but also includes rain. Ablation and accumulation are measured across glacier basins or ice caps using standardized methods as outlined in Ostrem and Brugman (1991). Field measurements of glacier mass balance are aided by the use of remote sensing instruments from space borne, airborne and terrestrial platforms, in concert with coordinated domestic and international efforts on the ground.
- Gardner and 15 others. Science, 340 (2013).
- Marshall and 7 seven others. Canadian Water Resources Journal 36(2): 109-134. (2011)
- Ostrem, G., and Brugman, M. Environment Canada, National Hydrology Research Institute (NHRI) Science Report 4, 224p. (1991)
- Shepard and 47 others. Science, 338 (2012).
- Extreme melt on Canada’s Arctic ice caps in the 21st century.
- Historically unprecedented global glacier decline in the early 21st century
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