=?UNKNOWN?Q?=28fwd?= from =?UNKNOWN?Q?N=E9stor=29?= 2003 ozone layer event
schaffer at optonline.net
Tue Aug 26 12:32:49 MDT 2003
speaking of over-emphasised risk, Nestor sent this to me earlier.
What follows is quite archetypal of the slanted ways in which the press
"informs" on the ozone layer. Please note references to harmful UV-B, skin
cancer et al. and absolute silence as to the seasonal characteristics of the
phenomenon even though the whole body of the article points to this fact
(also, the mention of 10,5 m sq. mi. without adequate description of
"population density" over the area under "risk" is misleading). It is these
tricks by the press which make people think that ozone layer depletion is
On a second thought, I believe that this might make its way into the list.
You decide. Originally, meant for you only.
[R-G] 2003 Ozone Hole May Be Record Size, Australia Says
usman majeed rad-green at lists.econ.utah.edu
Sun, 24 Aug 2003 20:16:27 -0700
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2003 Ozone Hole May Be Record Size, Australia Says
Fri August 22, 2003 02:57 AM ET
By Michael Perry
SYDNEY (Reuters) - The ozone hole over the Antarctic is growing at a rate
that suggests it could be headed for a record size this year, Australian
scientists said on Friday.
A study by Australian Antarctic bases attributed the development to colder
temperatures in the stratosphere where the ozone hole forms.
"The growth at the moment is similar to 2000 when the hole was a record
size," Australian Antarctic Division scientist Andrew Klekociuk told Reuters
Ozone is a protective layer in the atmosphere that shields the Earth from
the sun's rays, in particular ultraviolet-B radiation that can cause skin
cancer, cataracts and can harm marine life. In 2000, NASA said the ozone
hole expanded to a record 10.9 million square miles, three times the size of
Australia or the United States, excluding Alaska.
"This is in contrast to the situation in 2002 when unusually warm conditions
produced the smallest ozone hole since 1988," Klekociuk said.
The ozone hole in 2003 presently covers all of the Antarctic.
Klekociuk said scientists at Australia's Davis Antarctic base saw the first
signs of cooling of the lower stratosphere, 15 to 25 km (nine to 15 miles)
up, about six weeks earlier than usual.
In a visual sign the ozone hole would grow rapidly this year, scientists at
Australia's Mawson base have reported the early appearance of stratospheric
clouds, which create a spectacular lightshow by defracting sunlight around
Chemical reactions in these clouds convert normally inert man-made
chlorofluorocarbons (CFCs) into ozone destroyers. CFCs are commonly used as
propellants in spray cans.
The 1997 Kyoto treaty set in place a global process to reduce greenhouse
gases which deplete the ozone layer, but the world's biggest polluter the
United States has yet to sign.
Clouds do not usually form in the stratosphere due to its extreme dryness,
but during some winters temperatures become low enough to allow their
"In 2000 we didn't see the stratospheric clouds until the beginning of July.
This year we saw them about the middle of May which is the earliest we have
seen them," Klekociuk said.
The full extent of the 2003 ozone hole will not be known until the end of
September, as August and September are the coldest months for the South
Pole. Temperatures begin to warm by early October and the ozone layer will
then start to recover.
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