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U-M divers retrieve 8,900-year-old piece of wood from Lake Huron
Annarbor.com (12/12)
University of Michigan researchers announced they have found a 5 1/2 foot long, pole-shaped piece of wood that is 8,900 years old in Lake Huron.
Superior researchers studying invasives, ballast water
Ashland Current (2/9)
Determining how clean a ship's ballast water must be to prevent the spread of aquatic invasive species is the goal of the latest research partnership between the Northeast-Midwest Institute and the Lake Superior Research Institute at the University of Wisconsin-Superior.
RIVERKEEPERS: Tending the waterways
Niagara Gazette (2/6)
The goal of the Buffalo Niagara Riverkeeper is two-fold: protecting the water quantity and the quality, as well as connecting people to the waterfront.
Internationally renowned ‘Ocean Doctor’ to speak in Grand Rapids
MLive.com (2/3)
Known as the “Ocean Doctor,” David Guggenheim will speak in Grand Rapids, Mich., about the many similarities between the threats to the oceans and to our Great Lakes.
SUNY Fredonia to lead Great Lakes pollution study
Wall Street Journal (2/3)
Plastic pollution in the Great Lakes will be the focus of a study this summer. Led by the State University of New York at Fredonia, researchers will try to quantify the amount of plastic polluting the fresh water Great Lakes.
SSC students taking part in marine science bowl
Arenac County Independent (1/31)
Teams of Michigan high school students will be heading to Ann Arbor this weekend to take part in the annual Great Lakes Bowl, a quiz event that focuses on questions about marine and freshwater systems and biology.
What's going on in your neighborhood this month? Meet other people and learn together at recreational and educational events! Our new dynamic calendar is updated daily with current educational events.
Do the Great Lakes have tides?
from Jean in Milton, Massachusetts and Thor in Davisburg, Michigan
The same forces are at work on lakes as on oceans -- the moon pulls on inland lakes, too. However, you won't find large tides on lakes as you do on oceans; lakes just don't have enough water in them for large tides to occur.
Dr. David Hollander -- a specialist in lake systems at Northwestern University -- was asked about tides on inland lakes. He said that the Great Lakes sometimes experience slight changes in water levels over short time scales, and in spring, there's a substantial influx of water due to melting of winter snows farther north. Yet, none these changes in water level can be called a true tide.
However, there is some disagreement on the subject. According to the Canadian Hydrologic/Hydrographic Service, the Great Lakes experience tides from 1 to 4 cm, the strongest being on Lakes Superior and Erie. These tides are often masked out by meteorologically induced phenomena, such as a seiche (pronounced "sayshe"). When wind pushes down on one part of a lake, the water surface rises in another part, producing waves (most noticeable on Lake Erie because the lake is so shallow).
Read TEACH's segment, Great Lakes water levels, for more information; if you'd like a more in depth explanation, download the Great Lakes Commission's Living with the Lakes brochure.
Thank you both for your question!
Answered on October 1, 2000