List: trawlers@lists.trawlering.com
From: Scott H.E. Welch
Re: T&T: sea levels, was diesel prices
Sun, Dec 13, 2009 3:40 PM
David H Sorenson writes:
>
>BTW, we keep hearing about rising sea levels because of global warming
>(i.e., melting polar ice). Seriously, has anybody actually witnessed
>higher water levels on the coasts. If you check out this website,
>http://nsidc.org/arcticseaicenews/ , you will notice that the artic ice
>cover is pretty close to normal. With all the hype about global warming
>and whether it is true, one would think that if sea levels were actually
>rising along the North American coasts, we would never hear the end of
>it. Personally, I think the allegation of "climate change" and rising sea
>levels is -- shall I say -- bogus.
This happens to be an area I know a little bit about... I grew up in the
Arctic, where my father was a scientist. Among other things, we started
taking climate records in 1968 and he was chief scientist on a year-long
expedition tho the Bering Sea about 10 years ago.
A couple of notes: first, melting sea ice will have no effect on ocean level
-- the displacement of the ice sees to that. It's only melting glaciers which
can raise the sea level. Second, before making such broad and sweeping
generalizations, you may want to look at charts such as this:
http://nsidc.org/images/arcticseaicenews/20091207_Figure3.png . And third,
the real problem is the lack of multi-year ice. This means that while the
EXTENT of the ice may remain the same, the VOLUME of the ice is much less.
See http://nsidc.org/news/press/20081002_seaice_pressrelease.html
The reason that this is important all of is pretty clear, and I quote from
the first line of the page: "Arctic sea ice reflects sunlight, keeping the
polar regions cool and moderating global climate." Sea ice is almost a
perfect reflector of heat energy, while sea water is an excellent absorber of
same.
What we think of a "normal" climate is no more that what we have observed
over the past few hundred years and applied to a bell curve. It's not cooling
or warning that is the real worry, it is the instability associated with the
change. Such additional heat inputs will accelerate the danger.
Scott Welch
"Things turn out best for people who make the best of the way things turn
out." - John Wooden