by Staff Writers
London (UPI) Nov 23, 2011
Arctic sea ice has declined at an unprecedented rate during the past 50 years, a study in the British journal Nature said.
The study, published online Wednesday, said both the duration and magnitude of the current decline in sea ice "seem to be unprecedented for the past 1,450 years."
By analyzing sea ice for chemicals such as salt and methanesulfonic acid and comparing findings to other data such as sediment cores and tree rings, the researchers were able to reconstruct the amount of sea ice across the Arctic in the past, the Canadian Broadcast Corp. reported Wednesday.
Christophe Kinnard, lead author of the report, said a number of different issues are driving the loss of sea ice.
"Everything is trending up -- surface temperature, the atmosphere is warming, and it seems also that the ocean is warming and there is more warm and saline water that makes it into the Arctic," the CBC quoted Kinnard said saying, "and so the sea ice is eroded from below and melting from the top."
Previously, sea ice loss was driven by changes in ocean currents and not necessarily by periods of warmer temperatures.
Beyond the Ice Age
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. 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 Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|