[net-gold] WEATHER : SCIENCE : ENVIRONMENT: GLOBAL WARMING AND CLIMATE CHANGE: Wavier Jet Stream 'May Drive Weather Shift'.
- From: "David P. Dillard" <jwne@xxxxxxxxxx>
- To: Net-Gold -- Educator Gold <Educator-Gold@xxxxxxxxxxxxxxx>, net-gold@xxxxxxxxxxxxx, Net-Gold <Net-Gold@xxxxxxxxxxxxxxx>, NetGold <netgold@xxxxxxxxxxxxxxx>, K-12ADMINLIFE <K12ADMIN@xxxxxxxxxxxxxxxxxxx>, K12AdminLIFE <K12AdminLIFE@xxxxxxxxxxxxxxx>, MediaMentor <mediamentor@xxxxxxxxxxxxxxx>, Nabble Groups Net-Gold <ml-node+s3172864n3172864h56@xxxxxxxxxxxxx>, Net-Platinum <net-platinum@xxxxxxxxxxxxxxx>, Sean Grigsby <myarchives1@xxxxxxxxxxxxxxx>, Net-Gold <NetGold_general@xxxxxxxxxxxxxxxxx>, Temple Gold Discussion Group <TEMPLE-GOLD@xxxxxxxxxxxxxxxxxxx>, Temple University Net-Gold Archive <net-gold@xxxxxxxxxxxxxxxxxxx>, "Net-Gold @ Wiggio.com" <netgold@xxxxxxxxxxxxxx>, Health Lists -- Health Diet Fitness Recreation Sports <healthrecsport@xxxxxxxxxxxxxxx>, HEALTH-RECREATION-SPORTS-TOURISM@xxxxxxxxxxxxxxxxxxx
- Date: Mon, 17 Feb 2014 06:09:27 -0500 (EST)
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WEATHER :
SCIENCE :
ENVIRONMENT: GLOBAL WARMING AND CLIMATE CHANGE:
Wavier Jet Stream 'May Drive Weather Shift'
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Wavier Jet Stream 'May Drive Weather Shift'
By Pallab Ghosh Science correspondent,
BBC News
Chicago
http://www.bbc.co.uk/news/science-environment-26023166
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New research suggests that the main system that helps determine the
weather over Northern Europe and North America may be changing.
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The study shows that the so-called jet stream has increasingly taken a
longer, meandering path.
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This has resulted in weather remaining the same for more prolonged
periods.
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The work was presented at the annual meeting of the American Association
for the Advancement of Science (AAAS) in Chicago.
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The observation could be as a result of the recent warming of the Arctic.
Temperatures there have been rising two to three times faster than the
rest of the globe.
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According to Prof Jennifer Francis of Rutgers University in New Jersey:
"This does seem to suggest that weather patterns are changing and people
are noticing that the weather in their area is not what it used to be."
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The meandering jet stream has accounted for the recent stormy weather over
the UK and the bitter winter weather in the US Mid-West remaining longer
than it otherwise would have.
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"We can expect more of the same and we can expect it to happen more
frequently," says Prof Francis
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The jet stream, as its name suggests, is a high-speed air current in the
atmosphere that brings with it the weather.
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It is fuelled partly by the temperature differential between the Arctic
and the mid-latitudes.
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If the differential is large then the jet stream speeds up, and like a
river flowing down a steep hill, it ploughs through any obstacles - such
as areas of high pressure that might be in its way.
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If the temperature differential reduces because of a warming Arctic then
the jet stream weakens and, again, like a river on a flat bed, it will
meander every time it comes across an obstacle.
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This results in weather patterns tending to becoming stuck over areas for
weeks on end. It also drives cold weather further south and warm weather
further north. Examples of the latter are Alaska and parts of Scandinavia,
which have had exceptionally warm conditions this winter.
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The complete article may be read at the URL above.
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Sincerely,
David Dillard
Temple University
(215) 204 - 4584
jwne@xxxxxxxxxx
http://workface.com/e/daviddillard
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