-Caveat Lector-
Amazing,
I have not read about it here in NZ LOL
Peter
We are about to go on a Journey. All Aboard
http://sites.netscape.net/gsussnzl/homepage
- Original Message -
From: Das GOAT [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Friday, September 10, 1999 9:30 PM
Subject: [CTRL] Nozone: UV Radiation Levels Up 12%
-Caveat Lector-
UV Rays in New Zealand Seen Rising
By PAUL RECER
.c The Associated Press
WASHINGTON (AP) - A decades-long study has confirmed that sunburn-causing
ultraviolet radiation in New Zealand has increased by about 12 percent in
the
last 20 years, probably as the result of a thinning ozone layer in the
atmosphere.
The study, to be published Friday in the journal Science, measured the
midday
level of ultraviolet radiation at Lauder, New Zealand from 1979 to last
summer and found a steady increase in the UV rays.
On several occasions last summer, the study found, the UV index in Lauder
exceeded 12.5. A UV index level of 10 or more is considered to be very
high
by the Environmental Protection Agency.
Ultraviolet radiation has been measured at a number of places around the
Earth over the last few years because of concern about the thinning ozone
layer. The erosion of ozone has been blamed on the decades-long use of
industrial gases, such as propellants in hair spray and some refrigerants,
that destroy the natural atmospheric gas. Use of the ozone-destroying
chemicals has been phased out or curtailed under an international
agreement,
but the effects are expected to last well into the next century.
Ozone is a natural gas in the atmosphere that blocks some of the
ultraviolet
radiation from the sun. When ozone is thinned, more UV reaches the Earth.
Ultraviolet-B radiation is a primary cause of sunburn and some forms of
skin
cancer. High levels of UV-B are thought to harm some plants and animals.
Some experts have estimated that a 1 percent reduction in ozone can lead
to a
3 percent increase in some types of skin cancer.
UV radiation measurements in New Zealand and other sites in the far South
Pacific are of particular interest because they are thought to be
influenced
by the ozone hole that develops each spring over the South Pole. A thinner
ozone layer in the southern hemisphere is thought possibly to be a factor
in
the high rates of skin cancer in New Zealand.
The study by Richard McKenzie, Brian Connor and Greg Bodeker of the
National
Institute of Water and Atmospheric Research in New Zealand shows a strong
connection between a decrease in ozone and an increase in UV radiation,
experts said.
William J. Randel of the National Center for Atmospheric Research in
Boulder,
Colo., said there has been about a 10 percent thinning in the
stratospheric
ozone over the last 30 years, but scientists have had problems in
connecting
that with actual, dependable measurements of UV radiation increases at the
ground level. He said weather and other conditions make the measurements
difficult.
The work by McKenzie and his group, said Randel, gives powerful support
for
the estimates of how ozone thinning affects the increase in UV. The study
is
important, said Randel, because it gives reliable information for a long
period of time and boosts scientific confidence in the theory that links
ozone loss to UV increases.
``This is a significant study. It shows there is a good agreement between
the
calculated UV and the observed UV,'' said Randel and helps to validate the
ozone-UV models.
Ozone-killing gases in the atmosphere have leveled out in recent years, he
said, but it will take decades before the effects of the manmade chemicals
disappear altogether.
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