Comments | shanex: Oceal level rise

shanex

Oceal level rise

Apr 06, 2009 00:25

I just got back from iCon28, a science fiction convention. Much fun was had by all. One thing I didn't expect was a seminar on global climate change, poking holes in the bad science used on both sides of the issue. It was really interesting and, I'll admit, nudged me a little toward believing humans had a non-negligable part to play. I remain a ( Read more... )

Comments 7

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mactavish April 7 2009, 17:16:29 UTC

Also: A lot of the floating ice around the edges of Antarctica essentially jams the ice on slopes above it into place. As that goes, ice slides more quickly into the sea, where it melts, and raises levels.

No Subject anonymous April 6 2009, 06:51:34 UTC

What you didn't mention is the non-negligible amount of ice on continental masses in the northern hemisphere. I do not know, and haven't checked, how much water this is compared to either the Artic or Antartic, but if it melts it will surely have some effect on water levels ( ... )

Not just melting sidebernie April 6 2009, 14:27:50 UTC

Your post doesn't seem to account for the possibility of some but not all of the Antarctic ice melting, but there's another more important issue that needs to be accounted for.

Water density is correlated to temperature. As the temperature goes up, water gets less dense. Essentially, it expands. And there's a LOT of water out there. Just a few degrees average increase can make the volume of the oceans noticeably greater.

There's an online water density calculator here if you want to play around with it yourself. But the experts (yes, I know, but assuming for the moment that they're smarter than we are) are giving estimates between one and two feet of sea level rise due to thermal expansion alone.

Remember, "simple, understandable science" proved that man would never fly, walk on the moon, etc. etc.

Re: Not just melting sidebernie April 7 2009, 17:17:46 UTC

Density also affects circulation, which affects variation in water temperatures and thus air temperatures, both of which affect where ice is more likely to melt.

Re: Not just melting mactavish April 7 2009, 17:18:52 UTC

(that was me)

landley April 17 2009, 06:48:56 UTC

Ok, I'll bite. How did the land bridges between siberia and alaska, or out to java and such, get exposed during ice ages? (It works if the temperature goes down, but not if the temperature goes up?)

Or are they now saying that didn't happen?

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