Gore Sea Levels?
blueoval57 at VERIZON.NET
Sat Aug 12 19:59:02 MDT 2006
>Gore Sea Levels?
>By Dennis Avery
>Al Gores movie An Inconvenient Truth says
>human-emitted CO2 will boost the earths
>temperatures enough to melt the Arctic ice
>capand suddenly raise sea levels by 20 feet.
>First of all, lets understand just how cold the
>Antarctic is. Winter temperatures on its high,
>cold interior plateau range from 40 to 95
>degrees F below zero! In the summer (December)
>it warms, with temperatures dipping only to 49
>degrees F below zeroand sometimes rising within
>25 degrees F of the melting point (32 degrees
>F). But even then, the ice reflects virtually
>all of the suns rays back out into space.
>However, the worlds warming in the past 150
>years has produced a change in Antarctica. The
>huge East Antarctic ice sheet, which contains
>nearly 90 percent of the worlds ice, has been
>thickening. European satellites measured the ice
>sheets thickness 347 million times between 1992
>and 2003, and found it is gaining about 45
>billion tons of water per year because the
>planet has warmed enough for snow to fall at the coldest place on earth.
>The study, Snowfall-driven Growth in East
>Antarctic Ice Sheet Mitigates Recent Sea-level
>Rise was led by Curt Davis of the University of
>Missouri, and reported in Science on June 24, 2005.
>Thickening ice in the Antarctic, in fact, is
>just about offsetting the meltwater being
>released from the edges of the Greenland ice
>sheetwhich has also been thickening in its
>center. This leaves us with a global warming sea
>level gain of about 1.8 millimeters per yearor
>4 inches per century. The rise has remained
>constant during the 20th century despite the
>moderate 0.6 degree C warming of the planet.
> In the movie, a whole Antarctic ice sheet
> shatters on Gores computer screen. In the real
> world, that isnt happening. It is only the
> Antarctic Peninsula2 percent of the
> continents land area that sticks up toward the
> far-off equatorthat is warming. It recently
> earned headlines by calving an ice floe as big
> as Rhode Island, not an unusual event.
>But the East Antarctic ice sheet is more than
>2,000 times bigger than Rhode Island, and the
>ice is two miles thick! John Stone of the
>University of Washington, reporting in Science
>on January 3, 2003 says the West Antarctic ice
>sheet has been retreating so slowly for the past
>10,000 years that it still has not fully
>accommodated the end of the last Ice Age, and
>apparently still has about 7,000 years of ice to
>meltand the East Antarctic ice sheet is melting even more slowly than that.
>So. Al Gore says Antarctic melting will suddenly
>raise the sea levels by 20 feet, and the experts
>say 4 inches per century. Seth Borenstein, an AP
>science writer, did a column on June 27
>headlined, Scientists OK Gores Movie for
>Accuracy. The dean of environmental studies at
>Duke is quoted as saying He got all the important material and got it right.
>Were they talking about the same movie I saw?
>Gore overstated the impact of global warming on
>the Antarctic glaciers by about 50-fold. Or did
>he mean that 7000 years was sudden? How can
>so-called scientists applaud his accuracy either way?
>Dennis T. Avery was a senior policy analyst for
>the U.S. State Department, where he won the
>National Intelligence Medal of Achievement. He
>is the co-author, with atmospheric physicist
>Fred Singer, of Unstoppable Global Warming:
>Every 1500 Years, due in October from Rowman & Littlefield.
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