Ice Might Trigger Sudden 16ft Rise In Sea Levels, page 1


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Topic started on 2-2-2005 @ 02:19 PM by Hellmutt
A massive ice sheet in the Antarctic is in danger of collapsing. Its collapse would raise sea levels around the earth by more than 16 feet (5 meters).

From: The Independent: Dramatic change in West Antarctic ice could produce 16ft rise in sea levels

British scientists have discovered a new threat to the world which may be a result of global warming. Researchers from the Cambridge-based British Antarctic Survey (BAS) have discovered that a massive Antarctic ice sheet previously assumed to be stable may be starting to disintegrate, a conference on climate change heard yesterday. Its collapse would raise sea levels around the earth by more than 16 feet.

Professor Chris Rapley, the BAS director, told the conference at the UK Meteorological Office in Exeter, which was attended by scientists from all over the world, that their discovery had reactivated worries about the ice sheet's collapse.

Professor Rapley said: "The last IPCC report characterised Antarctica as a slumbering giant in terms of climate change. I would say it is now an awakened giant. There is real concern."


5 meters! FIVE! This is a huge disaster which could happen any moment...


reply posted on 3-2-2005 @ 11:27 AM by Nygdan
The ice sheet will have to have a volume corresponding to the increase in sea level, ie whatever volume of water you'd have over 16 feet applied across the world coastlines.

This sort of thing has certainly happened before, or at least enourmous peices of ice have slowly plopped into the artic oceans before. Its thought that, if into the atlantic, it'd desalinate the water, thus shutting down the Mid Oean Current, a density driven transoceanic cycling of water. I don't know if that specifically alters weather globally, but it does seem to be associated with Ice Ages.

Threat? Absolutely, positively, and completely and entirely plausible.

But is it actually occuring? Thats vitally important. Everyone has to be certain that its happening before they start evacuating coastal areas below "6 feet above sea level"
Originally posted by Hellmutt
It is disintegrating right now.

The report you cite states it may be. How long have they been recording melt data or whatever for that sheet?
they have found ice to be flowing into the sea at the enormous rate of 250 cubic kilometres a year.

And what is this relative to it former melt rate? And to other ice sheets in the region?

djohnsto77
it would probably cause devestating tsunamis worldwide at the time of collapse, no?

I'd think no, not actual tsunamis anyway, but it'd be a rush of water I'd think.

I would like to know which countries and land masses are at 16 feet sea level.

Hell, most. A 16 foot rise in sea level would pretty drastically change the coastlines of the world. Lots of micronesian/polynesian/indonesian countrys are only a few feet above sea level to begin with.


reply posted on 3-2-2005 @ 06:50 PM by Gools
Originally posted by Crakeur
...these guys should devote more time to more important areas of science like why men go bald.


I hope you are being sarcastic. Or do you think we should not have people monitoring conditions in the arctic and reporting back what is going on? If so, how do you justify your tax dollars for US and other country's installations there?

Think about this one...

If you drop an ice cube into a bathtub the water displacement is invisible to the naked eye. But it happens. It raises the level and it affects surface tension. If you could view the planet on the same scale as your bathtub and the ice sheet as the ice cube, would sixteen feet be visible to the naked eye?

I imagine the volume of ice is calculated based on density, surface area and estimated uniformness and thickness. That volume converted to liquid and spread all ove the earth's one ocean translates to what?

I'd like to see their calculation for how they arrived at 16 feet. Does it check out?

What's the surface area of the world's ocean?

I know that the density of ice is less than that of water. I also know that water's maximum density occurs around +4C and that the presence of salt affect's this number in relation to the concentration of salt. (surprising but true - water expands rather that contracts while freezing due to it's charged nature and resulting crystal formation). Damn those winter potholes!

What is the estimated volume of the ice sheet?

I think I can find the density numbers in an old text book. Anybody have the rest?

.
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