Unprecedented warm temperatures in the High Arctic this past summer were so extreme that researchers have begun revising their forecasts.
“Everything has changed dramatically in the watershed we observed,” reports geography professor Scott Lamoureux, PhD, the leader of an International Polar Year project recently announced in Canada. “It’s something we’d envisioned for the future, but to see it happening now is quite remarkable.”
Dr. Lamoureux’s new four-year project on remote Melville Island in the northwest Arctic brings together scientists and educators from three Canadian universities and the territory of Nunavut. They are studying how the amount of water will vary as climate changes and how this affects the water quality and ecosystem sustainability of plants and animals that depend on it. This information will be key to improving models for predicting future climate change in the High Arctic, which is critical to the everyday living conditions of people living there, especially through the lakes and rivers where they obtain their drinking water.
From their camp on Melville Island last July, where they recorded air temperatures over 20ºC (in an area with July temperatures that average 5ºC), the team watched in amazement as water from melting permafrost a meter below ground lubricated the topsoil, causing it to slide down slopes, clearing everything in its path and thrusting up ridges at the valley bottom “that piled up like a rug,” says Dr. Lamoureux, an expert in hydroclimatic variability and landscape processes. “The landscape was being torn to pieces, literally before our eyes. A major river was dammed by a slide along a 200-meter length of the channel. River flow will be changed for years, if not decades to come.”
Comparing this summer’s observations against aerial photos dating back to the 1950s, and the team’s monitoring of the area for the last five years, the research leader calls the present conditions “unprecedented” in scope and activity. What’s most interesting, he says, is that their findings represent the impact of just one exceptional summer.
“A considerable amount of vegetation has been disturbed, and we observed a sharp rise in erosion and a change in sediment load in the river,” Dr. Lamoureux says. “With warmer conditions and greater thaw depth predicted, the cumulative effect of this happening year after year could create huge problems for both the aquatic and land populations. This kind of disturbance also has important consequences for existing and future infrastructure in the region, like roads, pipelines and air strips.”
If this were to occur in more inhabited parts of Canada, it would be “catastrophic” in terms of land use and resources, he continues. “It would be like taking an area the size of Kingston and having 15% of it disappear into Lake Ontario.”
The researchers are working with other groups to investigate the impact of climate change on water in the Arctic and the impact of global warming.
For more information about the International Polar Year, click here.
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