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"Great Lakes Ice Cover Has Been Decreasing Since the 1970s"
The ice cover on the Great Lakes begins each year along shallower coasts during late fall and early winter.
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- The trend for peak ice cover on all of the lakes has gone from about 70 percent in 1973 to roughly 40 percent by 2018.
- Lakes Superior, Huron and Erie have seen the greatest declines.
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Ice cover on the Great Lakes and Lake St. Clair has been decreasing since the 1970s, impacting everything from fishing to shipping, a new study says.
The ice cover on the Great Lakes begins each year along shallower coasts during late fall and early winter and typically peaks in late winter and early spring. Most lakes remain partially ice free even during the time of maximum ice cover.
Lake Michigan and Lake Ontario, for example, tend to remain 80 to 90 percent ice free, largely because they are so deep. Lake Erie, on the other hand, is shallower and is typically 70 percent ice-covered by late winter, according to a press release.
The amount of ice cover fluctuates year to year, but the overall trend is downward over the past four decades. The trend for peak ice cover on all of the lakes has gone from about 70 percent in 1973 to roughly 40 percent by 2018, according to data by the Great Lakes Environmental Research Laboratory (GLERL).
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weather.com/...
The Great Lakes are the largest group of freshwater lakes on Earth by total area, and second-largest by total volume, containing 21% of the world's surface fresh water by volume.[2][3][4] The total surface is 94,250 square miles (244,106 km2), and the total volume (measured at the low water datum) is 5,439 cubic miles (22,671 km3),[5] slightly less than the volume of Lake Baikal(5,666 cu mi or 23,615 km3, 22–23% of the world's surface fresh water). Due to their sea-like characteristics (rolling waves, sustained winds, strong currents, great depths, and distant horizons) the five Great Lakes have also long been referred to as inland seas.[6] Lake Superior is the second largest lake in the world by area, and the largest freshwater lake by area. Lake Michigan is the largest lake that is entirely within one country.[7][8][9][10]en.m.wikipedia.org/...
"Despite this fairly consistent seasonal pattern, some lakes are losing ice cover faster than others. The greatest declines have been in Lake Superior, Huron, St. Clair, and Erie. The decreasing maximum ice extent of Great Lakes ice is due to a combination of natural climate influences as well as influences from man-made climate change."
www.climate.gov/...
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Links:
NOAA
climate.gov
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