Great Lakes Environmental Directory Great Lakes Great Lakes environment Great Lakes grants exotic species water pollution water export drilling environment Great Lakes pollution Superior Michigan Huron Erie Ontario ecology Great Lakes issues wetlands Great Lakes wetlands Great Lakes Great Lakes environment Great Lakes watershed water quality exotic species Great Lakes grants water pollution water export oil gas drilling environment environmental Great Lakes pollution Lake Superior Lake Michigan Lake Huron Lake Erie Lake Ontario Great Lakes ecology Great Lakes issues Great Lakes wetlands Great Lakes Resources Great Lakes activist Great Lakes environmental organizations Great Lakes Aquatic Habitat air pollution alien species threatened rare endangered species ecological Great Lakes information Success Stories Great Lakes Directory Home/News Great Lakes Calendar Great Lakes jobs/volunteering Search Great Lakes Organizations Take Action! Contact Us Resources/Links Great Lakes Issues Great Lakes News Article About Us Networking Services

Great Lakes Article:

Cold snap saves Lake Erie from further declines
Tom Henry
The Toledo Blade
01/26/2003


The cold snap has been a blessing to the Great Lakes, because it has frozen much of the water south of Lake Superior and has sealed off the lower lakes from further evaporation at a critical time of year.

But officials are leery about the summer outlook, predicting an eight-inch decline in Lake Erieís water level this June and proportionate declines elsewhere.

They blame roller-coaster temperatures that led up to the recent blast of arctic-like weather, plus a long drought in the upper lakes that replenish Erie. The Great Lakes region had a relatively dry fall. Those in the region may have shoveled a fair amount of snow this winter, but, in some parts, much of whatís fallen is viewed by hydrologists as a mirage because it was lake-effect.

That is snow formed by cold air masses that rob moisture from the lakes before they freeze over, Cynthia Sellinger, a National Oceanic and Atmospheric Administration hydrologist in Ann Arbor, explained. The lakes do not get that water back in a quick snow-and-melt cycle: Unless it is part of a snow-pack that thaws gradually, the stuff usually evaporates before it can replenish a water body, she said.

The good news to her and other Great Lakes watchers is that the evaporation cycle has been broken by the cold snap.

"Absolutely," Ms. Sellinger said. "[Having Lake Erie freeze] is the best thing that could have happened."

The bad news: The National Weather Service is predicting above-average temperatures and below-average precipitation in the coming months. If that proves to be true, she said, lake levels will invariably be lower than they were last summer - the only questions will be by how much and what effect that will have on recreational boaters and the shipping industry, both vital cogs to the regionís economy.

"There could be a tremendous amount of boat repairs from boaters hitting old hot-water tanks and other debris that all of a sudden are in propeller range because the water level dropped," predicted Macomb County marina owner George Czeisperger.

Chuck Brockman, a Lake St. Clair boater for 50 years, said he copes with changing levels by reading charts more carefully and avoiding unfamiliar spots. "Experienced boaters will be OK. The newer boater will have to learn," he said.

Shippers must haul lighter loads when lake levels decline, which increases costs.

The driving force of the Great Lakes is Lake Superior, by far the deepest lake. It is so deep that its temperature fluctuates only a few degrees, despite its northern latitude.

Ray Assel, a NOAA physical scientist who has spent years studying Great Lakes ice patterns, said he cannot cite a single year in which Superior has formed a thick block of ice across the lake. "I would hesitate to say it ever freezes over completely," he said.

A lot of what happens to Lake Erie this summer depends on how much ice forms and snow falls in the upper Great Lakes the rest of the winter, he said.

"Itís been very dry in the Michigan-Huron [lakes] basin the past six months," said Marie Strum, water resources engineer with the U.S. Army Corps of Engineers in Detroit.
This information is posted for nonprofit educational purposes, in accordance with U.S. Code Title 17, Chapter 1,Sec. 107 copyright laws.
For more information go to: http://www.law.cornell.edu/uscode/17/107.shtml. If you wish to use copyrighted material from this site for
purposes of your own that go beyond "fair use," you must obtain permission from the copyright owner.


Great Lakes environmental information

Return to Great Lakes Directory Home/ Site Map