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:11/17/2016)... -- Global Market Watch: Primarily supported by ownership ... and Academics) market is to witness a value of US$37.1 ... highest Compounded Annual Growth Rate (CAGR) of 10.75% is foreseen ... period 2014-2020. North America is not ... Europe at 9.56% respectively. Report Focus: ...
(Date:11/16/2016)... , Nov. 16, 2016 Sensory ... experience and security for consumer electronics, and ... financial and retail industry, today announced a global ... convenient way to authenticate users of mobile banking ... TrulySecure™ software which requires no specialized ...
(Date:11/15/2016)... Research and Markets has announced the addition of the ... their offering. ... The global bioinformatics market ... 6.21 Billion in 2016, growing at a CAGR of 21.1% during ... is driven by the growing demand for nucleic acid and protein ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... CARDIFF, UK (PRWEB) , ... December 08, 2016 ... ... high precision light to control cells — optogenetics — is key to exciting ... state of the art, spatially patterned light projected via free-space optics stimulates small, ...
(Date:12/8/2016)... , December 8, 2016 ... expanded its customisable SureSeq™ NGS panel range with the launch ... fast and cost-effective study of variants in familial hypercholesterolemia (FH). ... variation (CNV) detection on a single small panel and allows ... content. This includes all exons for LDLR , ...
(Date:12/8/2016)... Frederick, Maryland (PRWEB) , ... ... ... Inc announces the commercial launch of flexible packaging for their exceptionally ... (“SU”) disposable bag system extends RoosterBio’s portfolio of bioprocess media products engineered ...
(Date:12/8/2016)...  Soligenix, Inc. (OTCQB: SNGX) (Soligenix or the ... and commercializing products to treat rare diseases where ... the long-term follow-up data from its Phase 2 ... Defense Regulator (IDR), in the treatment of oral ... undergoing chemoradiation therapy (CRT).  The additional 12-month safety ...
Breaking Biology Technology: