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Quotes
….of South America. "Shifts in precipitation patterns would have obvious implications for agriculture and water resources and could present serious hardships in marginal areas" the authors wrote
...Administration. "Those storm tracks are linked with the position of the jet stream, which is one way we use to delineate the width of the tropics" Seidel said by telephone...
...Washington. "The jet streams are moving poleward, and so, presumably, would the storm tracks." This poleward migration…
Portends More Weather Extremes America's Jet Stream Creeping North
The Associated Press, April 19, 2008
The jet stream -- America's stormy weather maker -- is creeping northward and weakening, new research shows. That potentially means less rain in the already dry South and Southwest and more storms in the North.
And it could also translate into more and stronger since the jet stream suppresses their formation. The study's authors said they have to do more research to pinpoint specific consequences.
From 1979 to 2001, the Northern Hemisphere's jet stream moved northward on average at a rate of about 1.25 miles a year, according to the paper published Friday in the journal Geophysical Research Letters. The authors suspect global warming is the cause, but have yet to prove it.
The jet stream is a high-speed, constantly shifting river of air about 30,000 feet above the ground that guides storm systems and cool air around the globe. And when it moves away from a region, high pressure and clear skies predominate.
Two other jet streams in the Southern Hemisphere are also shifting poleward, the study found.
Jet Stream Shifts May Spur More Powerful Hurricanes
Willie Drye
The greenhouse effect is causing Earth's tropics to creep towards the poles
Quotes
...predict for this century,' it says. "The observed widening appears to have occurred faster than climate models predict in their projections of anthropogenic [man-made] climate change." The five datasets variously find expansion...
<>[12/02/2007] AFP - Global warming is pushing edges of tropics towards poles: study
"Your not expanding the tropical jungles, what youre expanding is the area of desertification" Weaver said
<>[12/02/2007] WHEC TV-10 -
Earths
Tropics Belt Expands
[12/02/2007] Nine MSN - Creeping tropics could trouble Australia
Tropics are spreading towards the poles thanks to global warming
The world's tropical regions have expanded dramatically since the late 1970s, bringing the threat of more droughts to Europe, according to a study. Scientists say there is powerful evidence that the tropical belt that surrounds the equator has spread 175 miles towards the poles over the last 25 years because of climate change. Some experts believe that the Sahara desert could be nudged hundreds of miles further north. Although climate change models predicted that the tropics…
U.N. climate chief: World should watch poles. Previous reports didn't factor in 'frightening' possibility of significant melt
Climate Change Hitting Arctic Faster, Harder
Wednesday 30 April 2008 Climate change is having a greater and faster impact on the Arctic than previously thought, according to a new study by the global conservation organization WWF.
The new study found that change was occurring in all arctic systems, impacting on the atmosphere and oceans, sea ice and ice sheets, snow and permafrost, as well as species and populations, food webs, ecosystems and human societies.
Melting of arctic sea ice and the Greenland Ice Sheet was found to be severely accelerated, now even prompting the expert scientists to discuss whether both may be close to their "tipping point" (the point where, because of climate change, natural systems may experience sudden, rapid and possibly irreversible change).
· Older sea ice in the Arctic giving way to younger, thinner ice · · Scientists warn Arctic might be ice-free by 2013 · Unprecedented 5 degree heating of part of Arctic Ocean due to global warming
The Arctic ice cap melted this summer to the greatest extent on record.
Scientists say oceans are losing some ability to absorb
atmospheric carbon dioxide, the chief industrial emission blamed for warming. And the
world's power plants, factories, automobiles and jetliners are spewing
carbon at a faster rate than anticipated.
September 7, 2007 (Runs 6:42) (CBC News Video) The summer ice in the Arctic is disappearing at alarming rates, and levels are at a record low. Kelly Crowe investigates why
Artic Melting faster than predicted by models video
Arctic Sea Ice Gone in Summer Within Five Years?
Seth Borenstein in
Washington December 12, 2007 An already relentless melting of the Arctic greatly accelerated this summer—a sign that some scientists worry could mean global warming has passed an ominous tipping point.
One scientist even speculated that summer sea ice could be gone in five years.
THE ARCTIC IS SCREAMING ... BUT WHAT IS IT SAYING?
Arctic sea ice has long been considered a proverbial "canary in a coal mine" for climate change, and scientists have observed declining sea ice amounts for many years. As predicted by our Arctic Regional Ice Forecasting System, sea ice melted to a new record low in the summer of 2007. But the real story of 2007 isn't that we simply set a new record low, but rather, it is the magnitude of the record low, which was well beyond our prediction. The September ice extent for 2007 ended up at 4.28 million square kilometers, which was 23% lower than the previous record set in 2005.
Quotes
[12/13/2007] Owen Sound Sun Times - Arctic sea ice took a dangerous hit this summer
This week, after reviewing his own new data, NASA climate scientist H Jay Zwally said: "At this rate, the Arctic Ocean could be nearly ice-free at the end of summer by 2012, much faster than previous predictions. 'The Arctic is often cited as the canary in the coal mine for climate warming,' said Zwally, who as a teenager hauled coal. 'Now as a sign of climate warming, the canary has died. It is time to start getting out of the coal mines.' 'The Arctic is screaming,' says Mark Serreze, senior scientist at the National Snow and Ice Data Center."
[12/12/2007] Los Angeles Times - Researchers say summer sea ice could soon vanish
SAN FRANCISCO - Arctic ice at the North Pole melted at a record rate during the northern summer of 2007, the latest sign that climate change has accelerated in recent years, climate scientists said. 'In 2007, we had off-the-charts warming,' Michael Steele, an oceanographer at the University of Washington, said at the 2007 meeting of the American Geophysical Union, where 15,000 researchers have gathered to discuss earthquakes, water resources, and climate change.
Reported by New Zealand Herald: It was an ominous summer for the Arctic region, where for the first time in recorded history, ships sailed across the Arctic Ocean in water that had been part of the polar icecap, said Donald Perovich of the US Army Cold Regions Research and Engineering Laboratory in New Hampshire. Reported by The Age and 4 more sources
While in the summer of 1980 the North Pole was covered by an ice sheath about the size of the continental United States, this summer the ice would not have covered the states west of the Mississippi River, he added. 'It's a tremendous decrease, but of course, the mystery is how did it happen?' Perovich said. Scientists said two principal factors are accelerating the vanishing of the polar ice pack, which helps cool the Earth by reflecting the sun's rays back into the atmosphere. Reported by New Zealand Herald and 2
more sources
Arctic Warming Faster Above Ground Level, Study Finds
Richard A. Lovett January 2, 2008 Global warming in the Arctic is mysteriously occurring more quickly 1.2 miles (2 kilometers) above the surface than at ground level, a new study says.
Arctic warming warning sounded
If Arctic sea ice melts rapidly –- like it did last summer, when an all-time low was recorded -- temperatures could rise dramatically over much of northern Alaska, Canada and Russia, a new study reports. "Arctic land warming and permafrost thaw are likely to accelerate," and the rate of warming could triple in coming years, says lead author David Lawrence of the National Center for Atmospheric Research. Warming has melted large areas of permafrost in the Arctic, leading to buckled highways, destabilized houses and "drunken forests" of trees that lean at wild angles. The study appears Friday in the journal Geophysical Research Letters.
Greenland ice sheet is meeeelllting,it's meeelllting!Posted at 10:17 AM on 11 Dec 2007The Greenland ice sheet is melting at an alarming rate! As in, faster than it has since satellite measurements began in 1979, and with 10 percent more melting in 2007 than in the previous record year of 2005. Allow researcher Konrad Steffen to put it into perspective for you: "The amount of ice lost by Greenland over the last year is the equivalent of two times all the ice in the Alps, or a layer of water more than one-half mile deep covering Washington D.C." Yes, we think that qualifies as alarming.
Greenland faces extreme ice melt due to record warm summers · · Glacial ice sheets existed on Earth even during ancient global warming
Greenland experiencing global warming again after 90 years
· · Greenland's landmass rising due to shrinking ice cap · · Hotspot under Earth’s crust dangerously melting Greenland’s ice: Experts
Scientists zero in on causes of glacier acceleration
Greenland ice melting fast too: reportReported 01/16/2008 by The Australian
JUST days after the revelation that Antarctica is melting faster than predicted comes news that the Greenland ice sheet is also shrinking fast. In fact, last northern summer Greenland's ice sheet melted more than at anytime in the last 50 years, international ...
Greenland’s rising air temperatures drive ice loss at surface and beyond
A new NASA study confirms that the surface temperature of Greenland's massive ice sheet has been rising, stoked by warming air temperatures, and fueling loss of the island's ice at the surface and throughout the mass beneath.
Study confirms Greenland ice sheet melt due to global warmingGlobal warming is behind the melting of the Greenland ice sheet, new research from an international team of glaciologists and climatologists confirms. The scientists, from the UK, Belgium, Denmark and the US, arrived at their conclusion after analyzing glaciological and meteorological records going back some five decades. Their findings are published in the Journal of Climate. Their investigations revealed that between the 1960s and 1990s, changes in the Greenland ice sheet were...
Record high melt in Greenland high places in 2007
The high places of icy Greenland set a new record in 2007 for snow melt. Marco Tedesco is a research scientist at NASA’s Goddard Space Flight Center. He said that at altitudes above 2,000 meters in Greenland – a little over a mile high – snow melted for up to 30 days longer than the 20-year average. Marco Tedesco: This is about 150 percent greater than the previous average. Data from satellites indicated surface temperatures over the Greenland ice sheet were up to four to six degrees Celsius above average in 2007. And as Greenland melts, sea level continues to rise. Marco Tedesco: When the snow melts, you have two major factors. The first thing, melting snow produces liquid water that can directly flow, at low elevation, into the sea, and so contributing directly to sea-level rise, or it can percolate through the ice sheet, eventually lubricating the ice-bedrock interface and accelerating the speed of glaciers flowing into the sea. What’s more, as fresh, brighter snow melts away, older, darker snow lies exposed, absorbing more sunlight and getting even warmer.
Video of a huge glacier falling apart
Updated Jakobshavn Glacier Calving
[12/12/2007] A2 Mediagroup - Greenland Melt Accelerating, According To CU-Boulder Study
Documents in this Story
Arctic sea
ice took a dangerous hit this summer - Owen Sound Sun Times [12/13/2007]
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