South Carolina Ged

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Q. When did the ice age ever visit South Carolina? Any cites on this? I went to college in Michigan, and Michigan around 12,000 years ago was buried under glacial ice that was something like two miles thick. But I had never heard of the ice making it all the way south to the Carolinas. ICE AGES - HOW MUCH TEMPERATURE CHANGE IS NEEDED TO TRIGGER AN ICE AGE? uth Carolina was used to indicate the furthest South they believe the glaciation had gone, and that LATITUDE applied all around the Northern Hemisphere. Do you understand now?

A. You make the point that a shift between South Carolina during the ice age and South Carolina today has to be bigger than a shift of a few degrees F. Again, I'd never heard of South Carolina ever being visited by Ice Age glaciers. But I believe the way that ice ages begin is with slightly increased snowfall, or slightly colder temperatures, in the Arctic region. This causes a slight buildup of snow and ice from one winter to the next, so that eventually a huge mass of ice builds up in the north and starts to flow southward. As the mass of ice moves, it then causes changes local weather conditions to become much colder as it moves. Hence a relatively small change in average temperatures at the poles can have a relatively big impact on the world, over time. Hysterical - I don't think it's correct that the latitude applied all around the Northern Hemisphere, for one thing. Look around the world today, and you clearly don't see the temperatures or the climate conditions being identical for every location that's at the same lattitude north. Much of Western Europe is at roughly the same latitude as parts of Labrador, for example, but Europe tends to be warmer than Labrador because of the effects of the Gulf Stream. The tops of the Sierra Nevada mountains are at the same latitude as, say, the City of San Francisco, but San Francisco's climate is much warmer -- basically, I believe, because of the greenhouse effect, because the blanketing effect of greenhouse gases in the atmosphere means that more of the earth's radiated heat is present at sea level than at 14,000+ feet. Similarly, you have coastal vs. continental climates, where places at the same latitude have different average temperatures because of the buffering effects of the oceans on the climate of nearby land areas. So I don't believe the glaciers descended southwards to the same latitutes, everywhere around the globe.

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