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March 7, 2005

Arctic Sea Ice -- Is it Disappearing?

Topics: General Science

While I'm always as concerned as the next guy(or gal) over the issue of global warming, and owing to the fact that it has long been recognized by climate modelers that CO2-induced global warming should be most noticeable in the polar regions, I've always been interested in SCIENTIFIC DATA that offers evidence for potential consequences of the changes in our "canary in the coal mine."

- Today, from Tech Central Station we have:
In most of the world, there is enough of the earth's dominant greenhouse gas -- water vapor -- to absorb the heat that radiates from the surface. Water vapor is scarcest where the air is coldest, however, because cold air can "hold" much less water vapor than warm air can.

Since temperatures are coldest in the polar regions, the driest air on earth occurs there. In those regions, the other greenhouse gases, especially CO2 and methane, take on a potentially much stronger role, and we would expect that increases in those gases would have their biggest impacts in those regions. As some scientists have said, the Arctic is "the canary in the coal mine" when it comes to global warming, and we should be watching there for early warnings of impending climate change.

Posted by Hyscience at March 7, 2005 2:09 PM

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