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Antarctic Ozone Hole

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Antarctic Ozone Hole

Old 19th Oct 2006, 21:06
  #1 (permalink)  
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Thumbs down Antarctic Ozone Hole

I don't have the link to this, purely copied and pasted from elsewhere...apologies for that..

Oct. 19, 2006

Erica Hupp/Dwayne Brown
Headquarters, Washington

NOAA, Earth System Research Laboratory, Boulder, Colo.

RELEASE: 06-338


NASA and National Oceanic and Atmospheric Administration (NOAA)
scientists report this year's ozone hole in the polar region of the
Southern Hemisphere has broken records for area and depth.

The ozone layer acts to protect life on Earth by blocking harmful
ultraviolet rays from the sun. The "ozone hole" is a severe depletion
of the ozone layer high above Antarctica. It is primarily caused by
human-produced compounds that release chlorine and bromine gases in
the stratosphere.

"From September 21 to 30, the average area of the ozone hole was the
largest ever observed, at 10.6 million square miles," said Paul
Newman, atmospheric scientist at NASA's Goddard Space Flight Center,
Greenbelt, Md. If the stratospheric weather conditions had been
normal, the ozone hole would be expected to reach a size of about 8.9
to 9.3 million square miles, about the surface area of North America.

The Ozone Monitoring Instrument on NASA's Aura satellite measures the
total amount of ozone from the ground to the upper atmosphere over
the entire Antarctic continent. This instrument observed a low value
of 85 Dobson Units (DU) on Oct. 8, in a region over the East
Antarctic ice sheet. Dobson Units are a measure of ozone amounts
above a fixed point in the atmosphere. The Ozone Monitoring
Instrument was developed by the Netherlands' Agency for Aerospace
Programs, Delft, The Netherlands, and the Finnish Meteorological
Institute, Helsinki, Finland.

Scientists from NOAA's Earth System Research Laboratory in Boulder,
Colo., use balloon-borne instruments to measure ozone directly over
the South Pole. By Oct. 9, the total column ozone had plunged to 93
DU from approximately 300 DU in mid-July. More importantly, nearly
all of the ozone in the layer between eight and 13 miles above the
Earth's surface had been destroyed. In this critical layer, the
instrument measured a record low of only 1.2 DU., having rapidly
plunged from an average non-hole reading of 125 DU in July and

"These numbers mean the ozone is virtually gone in this layer of the
atmosphere," said David Hofmann, director of the Global Monitoring
Division at the NOAA Earth System Research Laboratory. "The depleted
layer has an unusual vertical extent this year, so it appears that
the 2006 ozone hole will go down as a record-setter."

Observations by Aura's Microwave Limb Sounder show extremely high
levels of ozone destroying chlorine chemicals in the lower
stratosphere (approximately 12.4 miles high). These high chlorine
values covered the entire Antarctic region in mid to late September.
The high chlorine levels were accompanied by extremely low values of

The temperature of the Antarctic stratosphere causes the severity of
the ozone hole to vary from year to year. Colder than average
temperatures result in larger and deeper ozone holes, while warmer
temperatures lead to smaller ones. The NOAA National Centers for
Environmental Prediction (NCEP) provided analyses of satellite and
balloon stratospheric temperature observations. The temperature
readings from NOAA satellites and balloons during late-September 2006
showed the lower stratosphere at the rim of Antarctica was
approximately nine degrees Fahrenheit colder than average, increasing
the size of this year's ozone hole by 1.2 to 1.5 million square

The Antarctic stratosphere warms by the return of sunlight at the end
of the polar winter and by large-scale weather systems
(planetary-scale waves) that form in the troposphere and move upward
into the stratosphere. During the 2006 Antarctic winter and spring,
these planetary-scale wave systems were relatively weak, causing the
stratosphere to be colder than average.

As a result of the Montreal Protocol and its amendments, the
concentrations of ozone-depleting substances in the lower atmosphere
(troposphere) peaked around 1995 and are decreasing in both the
troposphere and stratosphere. It is estimated these gases reached
peak levels in the Antarctica stratosphere in 2001. However, these
ozone-depleting substances typically have very long lifetimes in the
atmosphere (more than 40 years).

As a result of this slow decline, the ozone hole is estimated to
annually very slowly decrease in area by about 0.1 to 0.2 percent for
the next five to 10 years. This slow decrease is masked by large
year-to-year variations caused by Antarctic stratosphere weather

The recently completed 2006 World Meteorological Organization/United
Nations Environment Programme Scientific Assessment of Ozone
Depletion concluded the ozone hole recovery would be masked by annual
variability for the near future and the ozone hole would fully
recover in approximately 2065.

"We now have the largest ozone hole on record," said Craig Long of
NCEP. As the sun rises higher in the sky during October and November,
this unusually large and persistent area may allow much more
ultraviolet light than usual to reach Earth's surface in the southern
colmac747 is offline  
Old 19th Oct 2006, 21:38
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Forgive my cynicism, but "ON RECORD"......................how long ago did records on this actually start?

"I say Captain Cook, that damn Ozone Hole seems a little bigger this trip".
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Old 19th Oct 2006, 22:53
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Hardly Never Not Unwilling
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Have you ever considered that if the time comes to bail out of this planet and for survival colonize the cosmos, those lucky enough to have the means will be...Americans?
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Old 19th Oct 2006, 23:12
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Have you ever considered that if the time comes to bail out of this planet and for survival colonize the cosmos, those lucky enough to have the means will be...Americans?
I dunno, I hear a lot of them wouldn't fit in a spaceship.


Does beg the hypothetical question though: If, say, we as a planet had ten years warning of a massive, unavoidable moon-sized meteorite hit and enough wherewithal, technology and resources to construct a small fleet of Mars-bound liferafts, who'd be on 'em?

Those with the best genetic potential of furthering humanity's march to the stars, or those with the most cash?

Last edited by Polikarpov; 19th Oct 2006 at 23:34.
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Old 20th Oct 2006, 06:07
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Ecce Homo! Loquitur...
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NASA: Earth's ozone layer appears to be on the road to recovery.
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Old 20th Oct 2006, 07:25
  #6 (permalink)  
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On the liferafts... Id say it would be the genetic elite, would money really be of any use after the end of the world?
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Old 20th Oct 2006, 07:45
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Always seemed a bit daft to me, this concept of humanity abandoning the environmentally ruined Earth, and voyaging for decades to some other planet in order to terraform it, and then colonise it.

Presumably the same technology (and the same patient waiting) that would be needed to terraform the Planet Plop could just as easily be applied to terraforming the broken Earth. And in the meantime, everyone could live in glass bubbles, wear spacesuits when travelling, and generally pretend that they're not on Earth, but are in actual fact living on Mars. It'd definitely be cheaper, anyway.

Hmm, could be a good plot for some sci-fi movie.

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Old 20th Oct 2006, 07:55
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We are a proscribed species, we will never be allowed to leave this world, do you think it is a accident that nobody has visited us yet?,tiz forbiden,here be dragons the star charts say.
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Old 20th Oct 2006, 11:39
  #9 (permalink)  
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Hmm! So which article is correct? Talk about opposites.
colmac747 is offline  
Old 20th Oct 2006, 11:43
  #10 (permalink)  
Stercus Accidit
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There's no hole in the ozone.
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Old 20th Oct 2006, 11:44
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Quoting Mr Tony Draper: "We are a proscribed species, we will never be allowed to leave this world, do you think it is a accident that nobody has visited us yet?,tiz forbiden,here be dragons the star charts say."

Actually, those of us from Betelgeuse run tourist ships here to watch the Human Race, in much the same way as you lot go to the zoo. It's great because we know that when the Earth is totally fcuked up, we can always go home again!

And while I'm at it, can I say that the old "Take me to your Leader" stuff is total [email protected]! As hyper-intelligent beings, why would we want to see George and Tony?
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