Posted on 04/29/2008 8:05:43 AM PDT by RightWhale
Come on Mother Nature! Get those temps dropping beyond debate so we can shut down this global warming hoax before it’s too late.
Ozone Hole Recovery May Reshape Southern Hemisphere Climate Change
Boulder CO (SPX) Apr 29, 2008
A full recovery of the stratospheric ozone hole could modify climate change in the Southern Hemisphere and even amplify Antarctic warming, according to scientists from the University of Colorado at Boulder, the National Oceanic and Atmospheric Administration and NASA.
While Earth’s average surface temperatures have been increasing, the interior of Antarctica has exhibited a unique cooling trend during the austral summer and fall caused by ozone depletion, said Judith Perlwitz of the Cooperative Institute for Research in Environmental Sciences, a joint institute of CU-Boulder and NOAA. “If the successful control of ozone-depleting substances allows for a full recovery of the ozone hole over Antarctica, we may finally see the interior of Antarctica begin to warm with the rest of the world,” Perlwitz said.
Perlwitz is lead author of a new study on the subject to be published April 26 in Geophysical Research Letters. Co-authors include Steven Pawson and Eric Nielson of NASA’s Goddard Space Flight Center in Greenbelt, Md., and Ryan Fogt and William Neff of NOAA’s Earth System Research Laboratory in Boulder. The study was supported by NASA’s Modeling and Analysis Program.
The authors used a NASA supercomputer model that included interactions between the climate and stratospheric ozone chemistry to examine how changes in the ozone hole influence climate and weather near Earth’s surface, said Perlwitz.
The study authors calculated that when stratospheric ozone levels return to near pre-1969 levels by the end of the 21st century, large-scale atmospheric circulation patterns now shielding the Antarctic interior from warmer air masses to the north will begin to break down during the austral summer. The circulation patterns are collectively known as a positive phase of the Southern Annular Mode, or SAM.
The scientists found that as ozone levels recover, the lower stratosphere over the polar region will absorb more harmful ultraviolet radiation from the sun. This could cause air temperatures roughly 6 to 12 miles above Earth’s surface to rise by as much as 16 degrees Fahrenheit, reducing the strong north-south temperature gradient that currently favors the positive phase of SAM, said the research team.
The supercomputer modeling effort also indicated that ozone hole recovery would weaken the intense westerly winds that currently whip around Antarctica and block air masses from crossing into the continent’s interior. As a result, Antarctica would no longer be isolated from the warming patterns affecting the rest of the world.
NASA’s Pawson said ozone recovery over Antarctica would essentially reverse summertime climate and atmospheric circulation changes that have been caused by the presence of the ozone hole. “It appears that ozone-induced climate change occurred quickly, over 20 to 30 years, in response to the rapid onset of the ozone hole,” he said. “These seasonal changes will decay more slowly than they built up, since it takes longer to cleanse the stratosphere of ozone-depleting gases than it took for them to build up.”
The seasonal shift in large-scale circulation patterns could have repercussions for Australia and South America as well. Other studies have shown that the positive phase of SAM is associated with cooler temperatures over much of Australia and increased rainfall over Australia’s southeast coastline.
During late spring and early summer, the positive phase of SAM also is associated with drier conditions in South America’s productive agricultural areas like Argentina, Brazil, Uruguay and Paraguay, said Perlwitz. If ozone recovery induces a shift away from a positive SAM, Australia could experience warmer and drier conditions while South America could get wetter, she said.
But just how influential a full stratospheric ozone recovery will be on Southern Hemisphere climate largely depends on the future rate of greenhouse gas emissions, according to the GRL authors. Projected increases in human-emitted greenhouse gases like carbon dioxide will be the main driver for strengthening the positive phase of SAM.
“In running our model simulations, we assumed that greenhouse gases like carbon dioxide would double over the next 40 years and then slowly level off,” said Perlwitz. “If human activities cause more rapid increases in greenhouse gases, or if we continue to produce these gases for a longer period of time, then the positive SAM may dominate year-round and dwarf any climatic effects caused by ozone recovery.”
Computer simulations are inherently Aristotelian, that is, they discover nothing that wasn’t already in the premise; purely deduction. Repeal the Law of the Excluded Middle and dump Aristotle.
Of course, South America and Australia have been having record cold, so that Aussie and Kiwi climatologists are much more sceptical of ‘global warming’ than their Northern Hemisphere counterparts.
‘Global Warming’ may be less a hoax than an artifact of Americo-Eurasian provincialism.
When did the body of water surrounding Antarctica become the Southern Ocean? I don't remember this from 60's and 70's geography. I always was under the impression that the Atlantic, Pacific and Indian oceans were on Antarctica's shores.
About 10 years ago. Another discovery I made and didnt like was the changing of AD (Anno Domini) to CE (Common Era). How absurd, it is still based on the birth of Christ!
Suspect a translation artifact.
Then the idiots will switch to global cooling without a flinch and think nothing of it.. and keep right on going.. The truth is they don't really care.. its faux care.. or posturing.. You know like a RAPPER.. who makes noises, assumes postureing, and shakes verbal trees like a chimpanzee.. acting out emotional stress,,
Liberals are very primitive.. Yes I;m talking about your wife, mother, cousin, or best friend.. Socially, politically, and intellectually primitives.. Even a few freepers..
As miserable and long as this winter from hell has been, I'm thinking a few more like it may actually be a good thing in the long run, if that helps wake people up, and save us from carbon dictatorship.
I refuse to use CE = Common Era.
I made it CE = CHRISTIAN ERA.
Cool, eh?
Obligarory d@mn glowbull warming comment!!
Gee, we keep hearing all the ice flows melted...
That’s right. We should have stayed with Latin.
EXTRA EXTRA
Global warming put off till next week...
I would worry the weight of the new ice will cause earth’s crust to slip and plunge Europe into the deep Arctic.
Idiots.
They are not idiots. They are Aristotelians. Syllogisms are useless, but we must know them.
The enigma of global warming...it makes things colder....
This was posted here several days ago.
http://www.freerepublic.com/focus/f-news/2007316/posts
I think it covers the rest of the planet.
Hurrecanes are also caused by warmer ocean temps, high temps more hurrecanes, low temps low number of H’canes.
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