[QODLink]
Archive
Global warming may cause big chill
Global warming could lead to a big chill in the North Atlantic, at least if history is anything to go by, researchers reported. 
Last Modified: 04 Dec 2004 12:25 GMT
Global warming is believed to cause drastic climate changes
Global warming could lead to a big chill in the North Atlantic, at least if history is anything to go by, researchers reported. 

Experts published evidence on Friday to support a popular theory that rising temperatures caused a big melt of polar ice 8200 years ago, causing a freshwater flood into the salty North Atlantic. 

This would have changed the flow of the balmy Gulf Stream and, in just a few years, average temperatures plummeted, ushering in a deep freeze that lasted a century or more, researchers have proposed. 

Writing in the 11 December issue of Geophysical Research Letters, Torbjorn Tornqvist, an assistant professor of earth and environmental sciences at the University of Illinois at Chicago, says he has evidence that this happened. 

"Few would argue it's the most dramatic climate change in the last 10,000 years," Tornqvist said. "We're now able to show the first sea-level record that corresponds to that event." 

Evidence found

Tornqvist and some graduate students found the evidence along the Gulf of Mexico off the southern US coast. 

They found peat deposits that would have been formed under rising sea levels. Working with researchers in the Netherlands, they dated the material to 8200 years ago. 

Their composition suggested they were made when a saltwater marsh was abruptly flooded and turned into a lagoon. 

"Climatologists urgently need this type of information to run their climate models in order to understand the conditions that can produce such an abrupt climate change," Tornqvist said. 

Source:
Reuters
Topics in this article
People
Featured on Al Jazeera
Muslim volunteers face questioning and threat of arrest, while aid has been disrupted or blocked, charities say.
Six months on, outrage and sorrow over the mass schoolgirl abduction has disappeared - except for families in Nigeria.
ISIL combatants seeking an 'exit strategy' from Mideast conflict need positive reinforcement back home, analysts say.
European nation hit by a wave of Islamophobia as many young fighters join ISIL in Syria and Iraq.
Featured
Lacking cohesive local ground forces to attack in tandem, coalition air strikes will have limited effect, experts say.
Hindu right-wing groups run campaign against what they say is Muslim conspiracy to convert Hindu girls into Islam.
Six months on, outrage and sorrow over the mass schoolgirl abduction has disappeared - except for families in Nigeria.
Muslim caretakers maintain three synagogues in eastern Indian city, which was once home to a thriving Jewish community.
Amid fresh ISIL gains, officials in Anbar province have urged the Iraqi government to request foreign ground troops.