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Lake Superior
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Lake Superior
Lake Superior is a lake in central North America. The northernmost, westernmost, and highest of the Great Lakes, Lake Superior straddles the Canada–United States border with the Canadian province of Ontario to the north and east and the U.S. states of Minnesota to the west and Michigan and Wisconsin to the south. It is the largest freshwater lake in the world by surface area and the third-largest freshwater lake by volume. It drains into Lake Huron via St. Marys River, then through the lower Great Lakes to the St. Lawrence River and ultimately the Atlantic Ocean.
The Ojibwe name for the lake is gichi-gami (in syllabics: ᑭᒋᑲᒥ, pronounced gitchi-gami or kitchi-gami in different dialects), meaning "great sea". Henry Wadsworth Longfellow wrote this name as "Gitche Gumee" in the poem The Song of Hiawatha, as did Gordon Lightfoot in his song "The Wreck of the Edmund Fitzgerald".
According to other sources, the full Ojibwe name is ᐅᒋᑉᐧᐁ ᑭᒋᑲᒥ Ojibwe Gichigami ("Ojibwe's Great Sea") or ᐊᓂᐦᔑᓈᐯ ᑭᒋᑲᒥ Anishinaabe Gichigami ("Anishinaabe's Great Sea"). The 1878 dictionary by Father Frederic Baraga, the first one written for the Ojibway language, gives the Ojibwe name as Otchipwe-kitchi-gami (a transliteration of Ojibwe Gichigami).
In the 17th century, the first French explorers approached the great inland sea by way of the Ottawa River and Lake Huron; they referred to their discovery as le lac supérieur (the upper lake, i.e., above Lake Huron in elevation). Some 17th-century Jesuit missionaries referred to it as Lac Tracy (for Alexandre de Prouville de Tracy). After taking control of the region from the French in the 1760s, following their defeat in the French and Indian War, the British anglicized the lake's name to Superior, "on account of its being superior in magnitude to any of the lakes on that vast continent".
Lake Superior empties into Lake Huron via the St. Marys River and the Soo Locks (Sault Ste. Marie locks). Lake Superior is the largest freshwater lake in the world by area and the third largest in volume, behind Lake Baikal in Siberia and Lake Tanganyika in East Africa. The Caspian Sea, while larger than Lake Superior in both surface area and volume, is brackish.
Lake Superior has a surface area of 31,700 square miles (82,103 km2), which is approximately the size of South Carolina or Austria. It has a maximum length of 350 statute miles (560 km; 300 nmi) and maximum breadth of 160 statute miles (257 km; 139 nmi). Its average depth is 80.5 fathoms (483 ft; 147 m) with a maximum depth of 222.17 fathoms (1,333 ft; 406 m). Lake Superior contains 2,900 cubic miles (12,100 km3) of water. There is enough water in Lake Superior to cover the entire land mass of North and South America to a depth of 30 centimetres (12 in). The shoreline of the lake stretches 2,726 miles (4,387 km) (including islands). The lake boasts a very small ratio (1.55) of catchment area to surface area, which indicates minimal terrestrial influence.
American limnologist J. Val Klump was the first person to reach the lowest depth of Lake Superior on July 30, 1985, as part of a scientific expedition, which at 122 fathoms 1-foot (733 ft or 223 m) below sea level is the second-lowest spot in the continental interior of the United States and the third-lowest spot in the interior of the North American continent after Great Slave Lake in the Northwest Territories of Canada (1,503 ft or 458 m below sea level) and Iliamna Lake in Alaska 942 ft or 287 m. (Though Crater Lake is the deepest lake in the United States and deeper than Lake Superior, Crater Lake's elevation is higher and consequently its deepest point is 4,229 feet (1,289 m) above sea level.)
While the temperature of the surface of Lake Superior varies seasonally, the temperature below 110 fathoms (660 ft; 200 m) is an almost constant 39 °F (4 °C). This variation in temperature makes the lake seasonally stratified. Twice per year, however, the water column reaches a uniform temperature of 39 °F (4 °C) from top to bottom, and the lake waters thoroughly mix. This feature makes the lake dimictic. Because of its volume, Lake Superior has a retention time of 191 years.
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Lake Superior
Lake Superior is a lake in central North America. The northernmost, westernmost, and highest of the Great Lakes, Lake Superior straddles the Canada–United States border with the Canadian province of Ontario to the north and east and the U.S. states of Minnesota to the west and Michigan and Wisconsin to the south. It is the largest freshwater lake in the world by surface area and the third-largest freshwater lake by volume. It drains into Lake Huron via St. Marys River, then through the lower Great Lakes to the St. Lawrence River and ultimately the Atlantic Ocean.
The Ojibwe name for the lake is gichi-gami (in syllabics: ᑭᒋᑲᒥ, pronounced gitchi-gami or kitchi-gami in different dialects), meaning "great sea". Henry Wadsworth Longfellow wrote this name as "Gitche Gumee" in the poem The Song of Hiawatha, as did Gordon Lightfoot in his song "The Wreck of the Edmund Fitzgerald".
According to other sources, the full Ojibwe name is ᐅᒋᑉᐧᐁ ᑭᒋᑲᒥ Ojibwe Gichigami ("Ojibwe's Great Sea") or ᐊᓂᐦᔑᓈᐯ ᑭᒋᑲᒥ Anishinaabe Gichigami ("Anishinaabe's Great Sea"). The 1878 dictionary by Father Frederic Baraga, the first one written for the Ojibway language, gives the Ojibwe name as Otchipwe-kitchi-gami (a transliteration of Ojibwe Gichigami).
In the 17th century, the first French explorers approached the great inland sea by way of the Ottawa River and Lake Huron; they referred to their discovery as le lac supérieur (the upper lake, i.e., above Lake Huron in elevation). Some 17th-century Jesuit missionaries referred to it as Lac Tracy (for Alexandre de Prouville de Tracy). After taking control of the region from the French in the 1760s, following their defeat in the French and Indian War, the British anglicized the lake's name to Superior, "on account of its being superior in magnitude to any of the lakes on that vast continent".
Lake Superior empties into Lake Huron via the St. Marys River and the Soo Locks (Sault Ste. Marie locks). Lake Superior is the largest freshwater lake in the world by area and the third largest in volume, behind Lake Baikal in Siberia and Lake Tanganyika in East Africa. The Caspian Sea, while larger than Lake Superior in both surface area and volume, is brackish.
Lake Superior has a surface area of 31,700 square miles (82,103 km2), which is approximately the size of South Carolina or Austria. It has a maximum length of 350 statute miles (560 km; 300 nmi) and maximum breadth of 160 statute miles (257 km; 139 nmi). Its average depth is 80.5 fathoms (483 ft; 147 m) with a maximum depth of 222.17 fathoms (1,333 ft; 406 m). Lake Superior contains 2,900 cubic miles (12,100 km3) of water. There is enough water in Lake Superior to cover the entire land mass of North and South America to a depth of 30 centimetres (12 in). The shoreline of the lake stretches 2,726 miles (4,387 km) (including islands). The lake boasts a very small ratio (1.55) of catchment area to surface area, which indicates minimal terrestrial influence.
American limnologist J. Val Klump was the first person to reach the lowest depth of Lake Superior on July 30, 1985, as part of a scientific expedition, which at 122 fathoms 1-foot (733 ft or 223 m) below sea level is the second-lowest spot in the continental interior of the United States and the third-lowest spot in the interior of the North American continent after Great Slave Lake in the Northwest Territories of Canada (1,503 ft or 458 m below sea level) and Iliamna Lake in Alaska 942 ft or 287 m. (Though Crater Lake is the deepest lake in the United States and deeper than Lake Superior, Crater Lake's elevation is higher and consequently its deepest point is 4,229 feet (1,289 m) above sea level.)
While the temperature of the surface of Lake Superior varies seasonally, the temperature below 110 fathoms (660 ft; 200 m) is an almost constant 39 °F (4 °C). This variation in temperature makes the lake seasonally stratified. Twice per year, however, the water column reaches a uniform temperature of 39 °F (4 °C) from top to bottom, and the lake waters thoroughly mix. This feature makes the lake dimictic. Because of its volume, Lake Superior has a retention time of 191 years.
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