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Posts tagged Northwest Territories

Sediments in Southern Part of Great Slave Lake’s Main Basin, Canada

62.6N 110.5W

June 25th, 2013 Category: Lakes, Sediments MODISTerra

Canada – June 24th, 2013

The Great Slave Lake is an enormous, complex body of water. It is the fourth largest lake in Canada and was formed as a result of glacial scouring. The lake has a large, open western basin and a narrow eastern arm with many islands.

Great Slave Lake is drained by the MacKenzie River and has many inflows, of which the Slave River from Lake Athabasca is the largest. Each day in the summer, the Slave River dumps 54,000 metric tons of dissolved minerals and 36,000 metric tons of silt into the southern part of the main lake basin, as can be seen here, which has a mineral content of 160 ppm.

The eastern arm and northern shore of the main basin have a lower dissolved mineral content (22-82 ppm) as a result of dilution by stream inflow off the Pre-Cambrian Shield. The large bays of the eastern arm are extremely deep (e.g. Christie Bay 614 m) and permafrost covers most of the north shore.

This extremely oligotrophic lake has low standing planktonic crops, a limited benthic invertebrate community (six species), and sparse populations of fish. The short summer in this subarctic climate is reflected by the condensed two-week period of yearly growth in whitefish during August (click here for more information).

Global Warming and Sea Ice by Northern Canada

69.9N 120.1W

June 13th, 2013 Category: Climate Change MODISTerra

Canada – June 12th, 2013

Bodies of water in the Arctic, in Canada’s Northwest Territories and the province of Nunavut are covered in ice: the Great Bear Lake (below), Amundsen Gulf (upper left) and Queen Maud Gulf (upper right). Most of the sea ice breaks up in July during a normal year, with some areas only breaking up in August. Here, ice can be seen breaking up in Amundsen Gulf, near the left edge.

Ongoing changes in the climate of the Arctic include rising temperatures, loss of sea ice, and melting of the Greenland ice sheet. The Arctic ocean will likely be free of summer sea ice before the year 2100. Because of the amplified response of the Arctic to global warming, it is often seen as a high-sensitivity indicator of climate change.

Wildfires West of Great Slave Lake, Canada

59.6N 120.3W

September 26th, 2012 Category: Fires, Lakes

Canada – September 25th, 2012

A string of days with no new forest fires in Canada came to an end on Tuesday September 24. Plumes of smoke from fires west and southwest of the Great Slave Lake (upper right quadrant), in Canada, blow to the south and the southeast. The fires are located in the country’s Northwest Territories (above) as well as in the provinces of British Columbia (lower left) and Alberta (lower right).

While the fire hazard has diminished greatly in provinces such as Ontario, other Canadian provinces are still receiving hot weather that is driving up the fire danger. Ontario will be providing 33 personnel to Alberta on Monday September 24 to assist with the fire hazard in that province.

Fires in Northwestern Canada Near Great Slave Lake

61.6N 113.7W

August 20th, 2012 Category: Fires

Canada – August 18th, 2012

While wildfires continue to burn in western USA, here some can also be seen in Canada, near the border of British Columbia (lower left), Alberta (lower center and right) and the Northwest Territories (above). Smoke from the fires creates a hazy veil over the Great Slave Lake, visible in the upper right quadrant.

Fires in Alberta, Canada, South of Great Slave Lake

58.4N 117.4W

July 18th, 2012 Category: Fires

USA – July 13th, 2012

Fires in the Canadian province of Alberta, just south of the border with the Northwest Territories (above), can be seen near the left edge and center of this image. A thick cloud of smoke released by the fires covers much of the lower half of the image. Visible in the Northwest Territories above the image center is the Great Slave Lake, tan and green from sediments. Upon opening the full image, the Great Bear Lake can also be seen, further north.