Antarctica: continent
mostly south of the Antarctic Circle.
Antarctic Circle: area approximately south
of latitude 66°32' south of the Equator. The Antarctic Circle
is the southern area of Earth which experiences at least one day when the
Sun does not rise or set.
Antarctic Treaty:
area of the world south of 60 degrees south latitude to 90 degrees south
latitude. 90 degrees south latitude is the "South Pole," the southern
end of Earth's rotational axis.
Antarctica Continent: "Fifth-largest continent,
following Asia, Africa, North America, and South America, but larger than
Australia and the subcontinent of Europe."
-Factbook
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Antarctica,
Antarctic
ANTARCTICA News:
20080403
-
Global
- Climate
- Atmosphere
- Science
- Antarctic
- Ice
- History
- UN
- San
Diego - California
- Iowa
- US
- "Dust
plays huge role in climate change: Tiny particles
heat up the atmosphere faster than scientist once believed. The good news
is this dust can be cleaned up fairly quickly." ... "Scientists know that
dust affects climate. Tiny particles create veils that reflect sunlight
and cool the atmosphere. Dark particles absorb sunshine and warm things
up. But as scientists look deeper into the dust-climate connection, they
find that they have underestimated its importance." ... "Research published
April 3 in Nature reveals the tight linkage between atmospheric dust flows
and Antarctic temperatures during ice ages over the past 800,000 years.
A research review published March 23 in Nature Geoscience online shows
that black carbon particles in the atmosphere have a more powerful global-warming
effect than any of the greenhouse gases except carbon dioxide. And these
particles are 60 percent as effective as CO2 itself. That's far more powerful
than the estimate in last year's report of the UN-sponsored Intergovernmental
Panel on Climate Change (IPCC)." ... "The good news is that black carbon
particles such as diesel soot or wood-stove smoke only stay airborne for
weeks. (It takes a century to get rid of today's CO2 emissions.) This fact
offers an opportunity for instant payback, say study authors V. Ramanathan
at Scripps Institution of Oceanography in San Diego [California] and Gregory
Carmichael at the University of Iowa in Iowa City [Iowa]. In an announcement
from Scripps, the authors note that commercially available technologies
exist to cut back soot emissions substantially. Using them would rapidly
reduce black-carbon warming. " -By Robert C. Cowen
-CSMonitor
20080326
-
Antarctic
- Ice
- History
- Global
- Climate
- Science
- Space
- Cameras
- "Chunk
of Antarctic ice shelf collapses, putting larger area at risk:
Rapid melting on Wilkins Shelf is attributed to global warming." ... "A
chunk of Antarctic ice about seven times the size of Manhattan [island
borough of New York City, New York] has collapsed, scientists said Tuesday,
putting an even greater portion of glacial ice at risk." ... "Satellite
images show the runaway disintegration of a 160-square-mile chunk in western
Antarctica that started Feb. 28. It was the edge of the Wilkins Ice Shelf
and had been there for perhaps 1,500 years." ... "British
Antarctic Survey scientist David Vaughan attributed the melting to
rising sea temperature due to global warming." ... "Because scientists
noticed satellite images of the event within hours of its start, they diverted
satellite cameras and flew an airplane over the ongoing collapse to capture
rare
photos and video." -AP
via -LAtimes
20080114
-
Global
- Climate
- Wind
- Earth's
- Ice
- Science
- "Escalating
Ice Loss Found in Antarctica: Sheets Melting in an
Area Once Thought to Be Unaffected by Global Warming." ... "Climatic changes
appear to be destabilizing vast ice sheets of western Antarctica that had
previously seemed relatively protected from global warming, researchers
reported yesterday, raising the prospect of faster sea-level rise than
current estimates." ... "While the overall loss is a tiny fraction of the
miles-deep ice that covers much of Antarctica, scientists said the new
finding is important because the continent holds about 90 percent of Earth's
ice, and until now, large-scale ice loss there had been limited to the
peninsula that juts out toward the tip of South America. In addition, researchers
found that the rate of ice loss in the affected areas has accelerated over
the past 10 years -- as it has on most glaciers and ice sheets around the
world." ... ""Without doubt, Antarctica as a whole is now losing ice yearly,
and each year it's losing more," said Eric Rignot, lead author of a paper
published online in the journal Nature Geoscience." ... "The Antarctic
ice sheet is shrinking despite land temperatures for the continent remaining
essentially unchanged, except for the fast-warming peninsula." ... "The
cause, Rignot said, may be changes in the flow of the warmer water of the
Antarctic Circumpolar Current that circles much of the continent. Because
of changed wind patterns and less-well-understood dynamics of the submerged
current, its water is coming closer to land in some sectors and melting
the edges of glaciers deep underwater." (1, 2)
-By Marc Kaufman -WashingtonPost
20060727
-
Global
- Climate
- Science
- Earth
- Ecosystem
- History
- "Cold,
Hard Facts." ... "My research colleagues and I found
that from 1986 to 2000, one small, ice-free area of the Antarctic mainland
had actually cooled. Our report also analyzed temperatures for the mainland
in such a way as to remove the influence of the peninsula warming and found
that, from 1966 to 2000, more of the continent had cooled than had warmed.
Our summary statement pointed out how the cooling trend posed challenges
to models of Antarctic climate and ecosystem change." ... "Newspaper and
television reports focused on this part of the paper. And many news and
opinion writers linked our study with another bit of polar research published
that month, in Science, showing that part of Antarctica’s ice sheet had
been thickening — and erroneously concluded that the earth was not warming
at all. “Scientific findings run counter to theory of global warming,”
said a headline on an editorial in The San Diego Union-Tribune. One conservative
commentator wrote, “It’s ironic that two studies suggesting that a new
Ice Age may be under way may end the global warming debate.”" ... "In a
rebuttal in The Providence Journal, in Rhode Island, the lead author of
the Science paper and I explained that our studies offered no evidence
that the earth was cooling. But the misinterpretation had already become
legend, and in the four and half years since, it has only grown." ... "In
the meantime, I would like to remove my name from the list of scientists
who dispute global warming. I know my coauthors would as well." -By
Peter Doran ["Peter Doran is an associate professor of earth and environmental
sciences at the University of Illinois at Chicago."]
-NYTimes
20060319
-
Government
- Climate
- Fuel
- Air
- Ice
- Environment
- Science
- Politics
- "Rewriting
The Science." ... "As a government scientist, James
Hansen is taking a risk. He says there are things the White House doesn't
want you to hear but he's going to say them anyway." ... "Hansen is arguably
the world's leading researcher on global warming. He's the head of NASA's
top institute studying the climate. But this imminent scientist tells correspondent
Scott Pelley that the Bush administration is restricting who he can
talk to and editing what he can say. Politicians, he says, are rewriting
the science." ... "Asked if he believes the administration is censoring
what he can say to the public, Hansen says: "Or they're censoring whether
or not I can say it. I mean, I say what I believe if I'm allowed to say
it."" ... "What James Hansen believes is that global warming is accelerating.
He points to the melting arctic and to Antarctica, where new data show
massive losses of ice to the sea." ... "Those human changes, he says, are
driven by burning fossil fuels that pump out greenhouse gases like CO2,
carbon dioxide. Hansen says his research shows that man has just 10 years
to reduce greenhouse gases before global warming reaches what he calls
a tipping point and becomes unstoppable. He says the White House is blocking
that message." (1, 2,
3)
-Produced By Catherine Herrick and Bill Owens-60
Minutes -CBSNews
20051124
-
World
- Climate
- Air
- Ice
- Science
- History
- "Greenhouse-gas
levels highest for 650,000 years: Climate record
highlights extent of man-made change." ... "Current levels of greenhouse
gases in the atmosphere are higher than at any time in the past 650,000
years, say researchers who have finished cataloguing air bubbles trapped
for millennia inside Antarctic ice. The record, which extends back over
the past eight ice ages, shows that today's concentrations of carbon dioxide
and methane far outstrip those in the past." ... "The researchers studied
air bubbles preserved in ice drilled from the Antarctic ice sheet as part
of the European Project for Ice Coring in Antarctica (EPICA). The ice core
represents a logbook of the state of the world's climate [...] and goes
back 210,000 years further than previous records." -By
Michael Hopkin -Nature
20030214
-
-
-
- "World
Starts Marching Against War in Iraq." ... "Millions
of people are expected to take to the streets of towns and cities across
the globe at the weekend to demonstrate against a looming U.S.-led war
on Iraq in the biggest peace protests since the Vietnam war." ... "In the
Australian city of Melbourne 100,000 people kicked off the global series
of demonstrations which will spread to some 600 towns and cities stretching
from Antarctica to Iceland." -By Jeremy Lovell -Reuters
via -ABCNEWS.com
20020124
-
"Scientists
discover Antarctic lakes warming faster than air."
-By Lauran Neergaard -AP
via -NandoTimes
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