Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. Earth Science News .




ICE WORLD
Arctic Warmth Unprecedented in 44,000 Years
by Staff Writers
London, UK (SPX) Jan 24, 2014


File image - Baffin Island.

When the temperature rises on Baffin Island, in the Canadian high Arctic, ancient Polytrichum mosses, trapped beneath the ice for thousands of years, are exposed. Using radiocarbon dating, new research in Geophysical Research Letters has calculated the age of relic moss samples that have been exposed by modern Arctic warming.

Since the moss samples would have been destroyed by erosion had they been previously exposed, the authors suggest that the temperatures in the Arctic now must be warmer than during any sustained period since the mosses were originally buried.

The authors collected 365 samples of recently exposed biological material from 110 different locations, cutting a 1000 kilometer long transect across Baffin Island, with samples representing a range of altitudes. From their samples the authors obtained 145 viable measurements through radiocarbon dating.

They found that most of their samples date from the past 5000 years, when a period of strong cooling overtook the Arctic. However, the authors also found even older samples which were buried from 24,000 to 44,000 years ago.

The records suggest that in general, the eastern Canadian Arctic is warmer now than in any century in the past 5000 years, and in some places, modern temperatures are unprecedented in at least the past 44,000 years. The observations, the authors suggest, show that modern Arctic warming far exceeds the bounds of historical natural variability.

"The great time these plants have been entombed in ice, and their current exposure, is the first direct evidence that present summer warmth in the Eastern Canadian Arctic now exceeds the peak warmth there in the Early Holocene era", said Gifford Miller, from the University of Colorado.

"Our findings add additional evidence to the growing consensus that anthropogenic emissions of greenhouse gases have now resulted in unprecedented recent summer warmth that is well outside the range of that attributable to natural climate variability."

.


Related Links
Wiley
Beyond the Ice Age






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





ICE WORLD
Polar bear diet changes as sea ice melts
Washington DC (SPX) Jan 23, 2014
A series of papers recently published by scientists at the American Museum of Natural History suggests that polar bears in the warming Arctic are turning to alternate food sources. As Arctic sea ice melts earlier and freezes later each year, polar bears have a limited amount of time to hunt their historically preferred prey-ringed seal pups-and must spend more time on land. The new researc ... read more


ICE WORLD
Indonesia increases maritime patrols

Mayor of scandal-hit Italy quake town withdraws resignation

UK charity expands Philippine anti-trafficking work

Tornadoes, flood, drought cost US billions in 2013

ICE WORLD
Google says buys artificial intelligence firm DeepMind

'Gears of War' videogame will stay in Xbox arsenal

MDA awarded key development work for exploration and communications

Lenovo to buy IBM's low-end server business for $2.3bn

ICE WORLD
War on lionfish shows first promise of success

WTO sets up panel to rule on Mexico-US tuna label feud

Great Lakes study dispels many misconceptions

Australia's drinking water at risk from extreme weather events

ICE WORLD
Arctic Warmth Unprecedented in 44,000 Years

North and Tropical Atlantic Ocean bringing climate change to Antarctica

Polar bear diet changes as sea ice melts

New sea anemone species discovered in Antarctica

ICE WORLD
Pathogenic plant virus jumps to honeybees

Hong Kong to cull 20,000 chickens after H7N9 found

Halting crop destruction in India saves up to $309 million

No-till soybean fields give (even some rare) birds a foothold in Illinois

ICE WORLD
More Precise Hurricane Forecasts with NASA-NOAA Suomi NPP VIIRS Satellite Sensor

New, younger age determined for the Grand Canyon

Two dead, 27 missing as flood engulfs Indonesia boat

"Sedimentary Bathtub" Amplifies Earthquakes

ICE WORLD
Chinese ivory smuggler in Kenya to test tough new law

Talks to end Mozambique skirmishes resume

Mozambique president inaugurates Chinese-built palace

Sudan warplanes hit rebel-held town: Kordofan insurgents

ICE WORLD
Putting 'Adam' in his rightful place in evolutionary history

Finland's education success opens new business niches

Blue eyes and dark skin, that's how the European hunter-gatherer looked

Calcium absorption not the cause of evolution of milk digestion in Europeans




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