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Re: Could a little warming raise oceans by 20 feet?

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the heat of fusion is tres largish

> >>> takes a long time, and we're still not sure how much additional
> >>> melting we've already committed to. An understanding of this
> >>> relationship in the past can help us understand both that and where
> >>> we're likely to be headed. As the authors put it, "Given the recent
> >>> increases in greenhouse gases and global mean temperature, the
> >>> present ice sheets are out of equilibrium with the climate, raising
> >>> important questions regarding their potential future contribution to
> >>> sea-level rise."
> >>>
> >>> The authors looked at three different warm periods. One was the
> >>> Mid-Pliocene warm period, which occurred three million years ago,
> >>> when atmospheric CO2 levels were similar to their present values.
> >>> Most climate records suggest temperatures were a few degrees warmer
> >>> than present (between 1 and 4 degrees Celsius), but some Arctic
> >>> records suggest elevated temperatures of up to 8 degrees Celsius,
> >>> which could have severe consequences for the Greenland ice sheet.
> >>> Coastal records suggest sea levels rose by more than 15 meters, while
> >>> models of the ice sheets in Greenland and Antarctica suggest those
> >>> contributed 13m to this rise.
> >>>
> >>> The second period considered was an unusually long interglacial
> >>> period about 400,000 years ago. Greenhouse gases reached levels
> >>> similar to those found in preindustrial times, while temperature
> >>> estimates suggest a climate that was 1 to 2 degrees Celsius warmer
> >>> than present. But pollen suggests that southern Greenland was covered
> >>> in a spruce forest, and sea level estimates suggest a rise of at
> >>> least 6 meters--the source of the 20 foot rise that made the
> >>> headlines.
> >>>
> >>> Another interglacial, coming about 120,000 years ago, saw global
> >>> temperatures only slightly warmer than present, but the Arctic and
> >>> Antarctic appeared to be unusually warm (in the area of 5 degrees
> >>> Celsius). Sea levels again reached at least six meters above present.
> >>> And some records suggest fluctuations of a meter or so occurred once
> >>> the high point was reached.
> >>>
> >>> So, *most of these estimates suggest* we're in for a lot higher sea
> >>> level given that we're committed to emitting enough carbon to easily
> >>> surpass the temperatures involved in the past warm periods. But it's
> >>> not entirely that simple. Those warm periods were caused by changes
> >>> in the pattern of sunlight that brings more to the Northern
> >>> Hemisphere--potentially explaining the high Arctic temperatures and
> >>> the severe impacts on Greenland. (That doesn't, of course, explain
> >>> the evidence of high Antarctic temperatures.) And, as noted above,
> >>> the error bars are still quite large.
> >>
> >>     Mom always said -- don build in the flood plain or near sea level.
> >
> > My Mom (2 yr more than Bert) lives in central Italy near the sea
> > (Adriatic) and there is a fine, light golden tinged sandy beach
> > (~50 m, difference in level is ~1 m): when the sea eats even one
> > meter (there are durable reference points) I could positively
> > tell you.
> >
> > regards
> > Angelo
> 
> So Angelo, as I understand it from "Professor" Wormley, global warming 
> cause a sea rise of more than a meter years ago! So tell us when you 
> noticed the beach was gone.
> 
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Could a little warming raise oceans by 20 feet? Sam Wormley <swormley1@gmail.com> - 2015-07-14 15:16 -0500
  Re: Could a little warming raise oceans by 20 feet? jimp@specsol.spam.sux.com - 2015-07-14 20:47 +0000
  Re: Could a little warming raise oceans by 20 feet? "hanson" <hanson@quick.net> - 2015-07-15 15:21 -0700
  Re: Could a little warming raise oceans by 20 feet? benj <nobody@gmail.com> - 2015-07-16 16:37 -0400
    Re: Could a little warming raise oceans by 20 feet? noTthaTguY <abu.kuanysh05@gmail.com> - 2015-07-16 14:13 -0700

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