Earth Science News  





.
WEATHER REPORT
Scientists find 'drastic' weather-related Atlantic shifts

Scientists have pointed to a disruption or shifts in the oscillation as an explanation for moist or harsh winters in Europe, or severe summer droughts such as in Russia, in recent years.
by Staff Writers
Geneva (AFP) Jan 4, 2011
Scientists have found evidence of a "drastic" shift since the 1970s in north Atlantic Ocean currents that usually influence weather in the northern hemisphere, Swiss researchers said on Tuesday.

The team of biochemists and oceanographers from Switzerland, Canada and the United States detected changes in deep sea Atlantic corals that indicated the declining influence of the cold northern Labrador Current.

They said in the US National Academy of Science journal PNAS that the change "since the early 1970s is largely unique in the context of the last approximately 1,800 years," and raised the prospect of a direct link with global warming.

The Labrador Current interacts with the warmer Gulfstream from the south.

They in turn have a complex interaction with a climate pattern, the North Atlantic Oscillation, which has a dominant impact on weather in Europe and North America.

Scientists have pointed to a disruption or shifts in the oscillation as an explanation for moist or harsh winters in Europe, or severe summer droughts such as in Russia, in recent years.

One of the five scientists, Carsten Schubert, of the Swiss Federal Institute of Acquatic Sciences and Technology (EAWAG), underlined that for nearly 2,000 years the sub polar Labrador current off northern Canada and Newfoundland was the dominant force.

However that pattern appeared to have only been repeated occasionally in recent decades.

"Now the southern current has taken over, it's really a drastic change," Schubert told AFP, pointing to the evidence of the shift towards warmer water in the northwest Atlantic.

The research was based on nitrogen isotope signatures in 700 year old coral reefs on the ocean floor, which feed on sinking organic particles.

While water pushed by the Gulfstream is salty and rich in nutrients, the colder Arctic waters carried by the Labrador current contain fewer nutrients.

Changes could be dated because of the natural growth rings seen in corals.

"The researchers suspect there is a direct connection between the changes in oceanic currents in the North Atlantic and global warming caused by human activities," said EAWAG in a statement.




Share This Article With Planet Earth
del.icio.usdel.icio.us DiggDigg RedditReddit
YahooMyWebYahooMyWeb GoogleGoogle FacebookFacebook



Related Links
Weather News at TerraDaily.com



Tempur-Pedic Mattress Comparison

Newsletters :: SpaceDaily Express :: SpaceWar Express :: TerraDaily Express :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News
WEATHER REPORT
China to step up efforts to control Mother Nature
Beijing (AFP) Dec 17, 2010
China plans to step up a weather-manipulation programme that has stirred debate about tinkering with Mother Nature, state media said on Friday. Zheng Guoguang, director of the China Meteorological Administration, said chronic water shortages in parts of the country will worsen in the decades ahead and "thus we need to control the weather," Xinhua news agency reported. China last year beg ... read more

.
Get Our Free Newsletters Via Email
  


WEATHER REPORT
No date yet for Haiti vote run-off: official

In squalid Haiti camps, rape stalks women: Amnesty

Crippling 'indecision' blamed for slow Haiti recovery

Floods take economic toll on Queensland

WEATHER REPORT
Team Develops Functionally Graded Shape Memory Polymers

Graphene Grains Make Atom-Thick Patchwork Quilts

New Intel chip a coup for Hollywood

Recycled Haitian Concrete Can Be Safe, Strong And Less Expensive

WEATHER REPORT
Study backs community management to save world's fisheries

Cold suspected in Chesapeake fish kill

U.K. rivers cleanest in a century

Looking At Beavers' Role In River Restoration

WEATHER REPORT
Russia frees two of five ships trapped in ice floes

Polar Bears No Longer On Thin Ice

H.K. duck's epic Arctic trip sheds light on migration

Obama gives 'lump of coal' to polar bears: activists

WEATHER REPORT
Another death in land protest in China: state media

'Contaminated' German eggs exported to Netherlands

University Of Illinois Research Makes Plant Breeding Easier

Taiwan wants pigs potty-trained to curb pollution

WEATHER REPORT
Australia's Great Barrier reef under threat from floods

Australian mayor says flood recovery may take a year

Death toll from Philippine rains rises to 25: government

Australian floods spread to 40 towns, threaten Barrier Reef

WEATHER REPORT
Sudan braces for secession poll trouble

China to send observers to Sudan for referendum

African migrants feared drowned off Yemen

West Africa faces dilemma over I.Coast military plan

WEATHER REPORT
Modern dialect linked to ancient Greek

Fueling The Body On Fat

Greece to build fence to stop migrants

Spanish judge to probe Iraq refugee camp killings - lawyer


The content herein, unless otherwise known to be public domain, are Copyright 1995-2010 - SpaceDaily. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement