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Mike Schoonveld: No more winter magic would be tragic for Great Lakes’ food web

Several years in the past decade, during milder-than-normal winters, a substantial portion of Lake Michigan’s and Lake Huron’s surface layers failed to cool to the 39.2 degrees needed to cause the fall overturn of the lake water. Schoonveld writes that if that were to continue to occur over the course of several years, it would have major consequences to the food chain in these lakes. (Stock photo)

Top researchers are worried that warmer winters will end the annual magic that happens on lakes Michigan and Huron most years.
They don’t call it magic, but I do because one seemingly unbreakable rule of physics gets broken all the time by the most abundant substance on earth – water. The rule is that as things get warmer, they expand and conversely, as they get cooler, they shrink. As stuff swells or shrinks, it becomes more or less dense. This expansion or contraction works at the atomic level and only a physicist could explain it.

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