Navigation Links
Arctic warmth unprecedented in 44,000 years, reveals ancient moss
Date:1/21/2014

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 are 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. 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 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."


'/>"/>

Contact: Ben Norman
Sciencenewsroom@wiley.com
44-012-437-70375
Wiley
Source:Eurekalert

Page: 1

Related biology news :

1. New sea anemone species discovered in Antarctica
2. Arctic cyclones more common than previously thought
3. Ice-loving sea anemones discovered in Antarctica
4. Pilot program to let US high-school students experience Antarctic science at a Chilean station
5. 7 new species of nearctic wasps described and illustrated
6. Virginia Tech research overturns assumption about mercury in the Arctic
7. New DRI project aimed at understanding Mercury dynamics in the Arctic tundra
8. New actors in the Arctic ecosystem
9. UF researchers experiment is first to simulate warming of Arctic permafrost
10. Antarctic fjords are climate-sensitive hotspots of diversity in a rapidly warming region
11. Rainfall to blame for decline in Arctic peregrines
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/31/2016)... -- Genomics firm Nabsys has completed a financial  restructuring under ... M.D., who returned to the company in October 2015. ... including Chief Technology Officer, John Oliver , Ph.D., ... Vice President of Software and Informatics, Michael Kaiser ... Bready served as CEO of Nabsys from 2005-2014 and ...
(Date:3/22/2016)... March 22, 2016 ... Sensors Market for Consumer Industry by Type (Image, ... Application (Communication & IT, Entertainment, Home Appliances, ... Forecast to 2022", published by MarketsandMarkets, the ... to reach USD 26.76 Billion by 2022, ...
(Date:3/18/2016)... , March 18, 2016 --> ... of Biometrics, ICT, Manned & Unmanned Vehicles, Physical infrastructure and ... security companies in the border security market and the continuing ... and Europe has led visiongain to ... improved success. --> defence & security companies ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... Epic Sciences unveiled a liquid biopsy ... PARP inhibitors by targeting homologous recombination deficiency (HRD) ... test has already been incorporated into numerous clinical ... Over 230 clinical trials are investigating ... PARP, ATM, ATR, DNA-PK and WEE-1. Drugs targeting ...
(Date:6/23/2016)... Wausau, WI (PRWEB) , ... June 23, 2016 ... ... probiotic supplements, is pleased to announce the launch of their brand, UP4™ Probiotics, ... supplements for over 35 years, is proud to add Target to its list ...
(Date:6/23/2016)... 2016 Houston Methodist Willowbrook Hospital has ... Association to serve as their official health care ... Willowbrook will provide sponsorship support, athletic training services, ... coaches, volunteers, athletes and families. "We ... Association and to bring Houston Methodist quality services ...
(Date:6/23/2016)... FRANCISCO , June 23, 2016   EpiBiome ... has secured $1 million in debt financing from Silicon ... ramp up automation and to advance its drug development ... its new facility. "SVB has been an ... beyond the services a traditional bank would provide," said ...
Breaking Biology Technology: