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2014-07-09
R.I.P. William 'Bill' Herbert Kelder - Intellpuke

2013-11-28
Gamers Donate 37,500 Pounds Of Food To Needy

2013-09-30
Statement From The Whitehouse Regarding The Government Shutdown

2013-09-29
An Open Response To 'Organizing for Action'

2013-08-26
Bayou Corne: The Biggest Ongoing Disaster In The U.S. You Have Not Heard Of

2013-04-21
Boston Mayor Hopes Feds 'Throw the Book' at Marathon Bombing Suspect

2013-04-19
Boston Police Closing In On Suspects

2013-04-15
2 Explosions At Boston Marathon. 2 Dead, Many Injured.

2013-01-03
The Press vs Citizens Rights and Privacy - Act 3

2012-12-30
CBS News - Year In Review 2012

Nature.com - 366 Days: 2012 In Review

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TruTV - The Biggest Conspiracy Theories of 2012

Colbert Nation: 2012: A Look Back

FIP Year In Review(s?)

2012-12-25
Happy Holidays

2012-12-21
Welcome To A New Era!

2012-12-16
An Open Letter To United Health Care, Medcom, And The Medical Insurance Industry In General

2012-11-17
Whitehouse Petition To Remove "Under God" and "In God" From Currency And The Pledge.

2012-11-15
December 21, 2012

2012-11-11
If Hillary Clinton Ran For President, She Would Probably Be The Best-prepared Candidate In American History

2012-11-10
CIA Director David Petraeus Resigns After FBI Investigation Uncovers Affair With High-Profile Journalist

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2012-11-07
Thank you for voting.

2012-11-06
Live Election Results

2012-09-30
FIP In Hiatus

2012-09-18
U.S.-Afghan Military Operations Suspended After Attacks

Iran Nuclear Chief Says IAEA Might Be Infiltrated By 'Terrorists And Saboteurs'

Romney Stands By Gaffe

2012-09-17
President Obama Says China Trade Practices Harm American Auto Parts Workers


Scientists Attribute Extreme Weather To Man-Made Climate Change
2012-07-10 20:08:07 (112 weeks ago)
Posted By: Intellpuke
Climate-change researchers have been able to attribute recent examples of extreme weather to the effects of human activity on the planet's climate systems for the first time, marking a major step forward in climate research.

The findings make it much more likely that we will soon – within the next few years – be able to discern whether the extremely wet and cold summer and spring so far experienced in the U.K. this year are attributable to human causes rather than luck, according to the researchers.

Last year's record warm November in the U.K. – the second hottest since records began in 1659 – was at least 60 times more likely to happen because of climate change than owing to natural variations in the earth's weather systems, according to the peer-reviewed studies by the National Oceanic and Atmospheric Administration (NOAA) in the U.S., and the Met Office in the U.K. The devastating heatwave that blighted farmers in Texas in the U.S. last year, destroying crop yields in another record "extreme weather event", was about 20 times more likely to have happened owing to climate change than to natural variation.

Attributing individual weather events, such as floods, droughts and heatwaves, to human-induced climate change – rather than natural variation in the planet's complex weather systems – has long been a goal of climate change scientists. The difficulty of separating the causation of events from the background "noise" of the variability in the earth's climate systems has until now made such attribution an elusive goal.

To attribute recent extreme weather events – rather than events 10 years ago or more – to human-caused climate change is a big advance, and will help researchers to provide better warnings of the likely effects of climate change in the near future. This is likely to have major repercussions on climate change policy and the ongoing efforts to adapt to the probable effects of global warming.

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Peter Stott, of the U.K.'s Met Office, said: "We are much more confident about attributing [weather effects] to climate change. This is all adding up to a stronger and stronger picture of human influence on the climate."

The researchers also said that not every extreme weather event could be attributed to climate change. For instance, the extremely cold British winter of 2012-11 - starkly exemplified by the satellite picture of the U.K. and Ireland covered in white on Christmas Eve, as snow gripped the nations – was owing to variations in the systems of ocean and air circulation. Although such cold winters are now only half as likely as they were several decades ago, owing to a generally warming climate across the world, extremely low temperatures of this type are still possible depending on circulation effects – in this case, a negative North Atlantic Oscillation, the circulation system that is a key determinant of European weather.

Floods in Thailand last year, another example studied in the research, were also not judged to be due to climate change but to other factors such as changes in the management of local river systems.

Following and predicting temperature rises tends to be much less complex than predicting – and attributing the causes of – changes in precipitation patterns.

This year's weather in the U.K. is an example. The Met Office has said the record wet conditions, which have brought serious flooding to regions from Yorkshire to the south-west, were owing to "a particularly disturbed jet stream". That is the weather system across the north Atlantic that normally lies at higher latitudes during the British summer, but has been lower in latitude than usual for several years running, bringing wet and sometimes cold conditions. Some research has suggested that the massive melting of Arctic ice has been responsible for this effect – by changing the patterns of warmer and colder winds in the upper atmosphere.

The key question – of whether man-made global warming is putting a dampener on British summers – will take several years to solve, according to Stott. "This is an open question in terms of research – it is too early days to be able to say," he said.

Intellpuke: You can read this article by Guardian Environment Correspondent Fiona Harvey in context here: www.guardian.co.uk/environment/2012/jul/10/extreme-weather-manmade-climate-change


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