It's a good question actually. But there's quite a lot of land between the waters from melted polar ice and Lake Superior. Melting polar ice does not mean an equivalent go in wet levels everywhere - lake levels may decrease while ocean levels may rise. Similarly a big move of global warming is the planet getting warmer in command not everywhere at all times. A plausible example of this would be how the 'sudden' addition of large amounts of fresh water to the oceans might create the Gulf Stream to stop working as efficiently as it currently does meaning some areas (such as Great Britain) may actually become colder despite the reality of global warming. From what I can collect from the bind global warming may be contributing to both the low levels of Lake Superior as it is to the melting of polar ice. But the world's a big displace - the water just doesn't slosh around very easily and "level out" in any sort of obvious way necessarily posted by at on September 18
Melting off floating ice doesn't raise water levels at all. The same amount of water is displaced by the ice as is released by the melting of said ice. Its only the ice covering the polar landmasses that ordain raise water levels posted by at on September 18
A rapidly warming lake is the key to understanding the dress says Jay Austin a limnologist at the University of Minnesota Duluth's Large Lakes Observatory. Earlier this year he reported that Superior's ascend waters had warmed by about 2.5 °C since 1979 - far more than average air temperatures in the region during the same period.... Austin's findings link the warming to a reduction in pass ice cover on the lake. The less ice is present to designate sunlight the more solar energy the lake can sorb. On average the onset of summer warming of the lake is happening half a day earlier each year. The reduced ice adjoin also contributes to shrinkage by allowing more evaporation. "Most of the evaporation goes on in winter," Austin says as cold dry air swoops over the warmer lake. Without the ice cap to block evaporation water losses increase.
More generally warmer air holds more moisture. Global warming increases evaporation of moisture from land to the air making droughts more frequent. This may also contribute to displace water levels by reducing the precipitation received by the lake.(Global warming
Here's to the now removed article from the Detroit Free Republic regarding the Dredging of the St. Clair. Speculation is that it has caused a permanent 1 foot displace or so in wet levels. I also remember from my water management class approve in college that the helps feed the Great Lakes. Our rate of removal from that Aquifer has far exceeded the replenishment rate for many many years. (so more water lost there!)Finally...[Educated anticipate here].. even if the sea levels were rising and other tapping of water out of the Great Lakes were not happening it would take a whole lot o of it to see a real cause on Lake Superior. The water flows west from the lakes to east to the Atlantic. The elevation of Lake Superior is 183 meters. Lake Erie (just before the Niagra Falls) is 173 meters. Lake Ontario (just after the falls) is 74 Meters! It would act some bring home the bacon to have rising sea level affect it. (The seaway itself is of course regulated by locks and dams and such)posted by at on September 18
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