. Earth Science News .
Weakening of Gulf Stream Linked To Europe's "Little Ice Age"

Satellite image of the 'Gulf Stream'. Credit: NASA.
by Staff Writers
Paris (AFP) Nov 29, 2006
Four hundred and seventy years ago, England's King Henry VIII travelled on the surface of the River Thames -- by horse. Legend has it that the monarch was pulled all the way from central London to Greenwich on a sleigh on the icy surface of the river, which had frozen from bank to bank that winter because of bitter cold.

London's so-called Frost Fairs, in which carnivals were occasionally held on the thickly frozen river, were a hallmark of the "Little Ice Age" that gripped Northwestern Europe from around 1200 to 1850.

And a new study, published on Thursday in the British scientific journal Nature, explains why this phenomenon occurred.

It puts the blame on a weakening of the Gulf Stream, the current which takes warm water from the tropical mid-Atlantic up to Europe's western coastline and provides those countries with balmy weather even though they are on the same latitude as chilly Labrador.

The evidence comes from sediment cores from the region where the Gulf Stream enters the North Atlantic Ocean, called the Florida Straits.

The cores hold a calcified species of plankton called foraminifera, whose presence is detectable by levels of the isotope oxygen 18.

This isotope, in turn, is dependent on the salinity and temperature of the seawater, which in turn indicate the seawater's density and thus its flow.

During the Little Ice Age, the Gulf Stream's flow was 10 percent lower in volume than today's, according to the study, lead-authored by David Lund of the Californian Institute of Technology (Caltech).

A year ago, a paper also published in Nature by oceanographers at Britain's University of Southampton found that a key branch of the Gulf Stream system, the North Atlantic Drift, had lost 30 percent of its flow since 1998.

Those findings were made by a survey ship, which travelled along 24 degrees latitude north on a line from the Bahamas to tropical West Africa, measuring salinity and temperature every 50 kilometers (31 miles).

Previous research was conducted along the same line, in 1957, 1981, 1992 and 1998.

The paper revived fears that global warming could paradoxically plunge Northwestern Europe into a mini Ice Age.

Under this doomsday scenario, freshwater from melting Greenland ice and Siberian permafrost would rush into the North Atlantic, braking the Gulf Stream's conveyor belt of circulating warm water.

Other scientists, though, criticised the Southampton University study, saying its data was too narrow to permit any firm conclusion.

Source: Agence France-Presse

Related Links
Californian Institute of Technology
Beyond the Ice Age

Scientists Study 'Snowball Earth'
Victoria (UPI) Nov 28, 2006
Canadian scientists have determined the factors involved in ending a severe ice age 750 million years ago that nearly completely froze Earth's oceans. Since the factors initiating a so-called "Snowball Earth" era have been the subject of much study, Jeffrey Lewis and colleagues at the University of Victoria focused on determining the factors that pulled Earth from its snowball state.







  • Red Cross Calls For Disaster Cash Boost
  • Red Cross Calls For Stronger Alliances To Fight Disasters
  • NIST Test Fans The Flames For High-Rise Fire Safety
  • UN Official Laments Darfur Aid

  • Farm Animals More Damaging To Climate Than Cars
  • Prominent Researchers Advocate Creation Of National Climate Service
  • Lessons Learnt From Drought Deaths 40,000 Years Ago
  • 'Divided' Countries Could Leave Climate Deal In 'Tatters'

  • Tiger Workshop Highlights Project Results
  • 'Enact Space Law To Govern Use Of Remote Sensing Data'
  • European Space Agency And Google Earth Showcase Our Planet
  • GeoEye-1 Will Use SGI Technology To Process Image Data

  • Last LHC Superconducting Main Magnet Completes The Suite At CERN
  • Scientists Solve Mystery of How Largest Cellular Motor Protein Powers Movement
  • DRS Receives Contract To Develop High-Speed Electric Generator For The USN
  • China Moves Ahead With Project To Rival Three Gorges In Size

  • Africa Urged To Break Deafening Silence On AIDS
  • Flu Vaccines Plentiful Amid Low Demand
  • Setting The Stage To Find Drugs Against SARS
  • Pattern Of Human Ebola Outbreaks Linked To Wildlife And Climate

  • Night Of The Living Enzyme
  • Fragmentation Rapidly Erodes Amazonian Biodiversity
  • Could Global Warming Be Crushing Blow To Crocodiles
  • Ethiopia's Famed Black-Maned Lions Being Stuffed For Lack Of Cash

  • Borneo Mud Outflow Contains Toxic Chemicals
  • Ivory Coast Appeals For Help To Clean-Up Toxic Waste
  • Chinese Pollution A Rising Health Threat
  • UN Seeks Help To Clean Up Deadly Ivorian Toxic Waste Dumps

  • First Map Of Structural Variation In The Human Genome Under Construction
  • Genetic Variation Shows We're More Different Than We Thought
  • Neanderthal Genome Sequencing Yields Surprising Results
  • Dad Inspired 'Jurassic Park,' Son Inspires 'Jurassic Poop'

  • The content herein, unless otherwise known to be public domain, are Copyright 1995-2006 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA PortalReports are copyright European Space Agency. All NASA sourced material is public domain. Additionalcopyrights 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