Navigation Links
Global warming in the Canadian Arctic
Date:11/18/2013

Qubec City, November 18, 2013 Ph.D. student Karita Negandhi and professor Isabelle Laurion from INRS'Eau Terre Environnement Research Centre, in collaboration with other Canadian, U.S., and French researchers, have been studying methane emissions produced by thawing permafrost in the Canadian Arctic. These emissions are greatly underestimated in current climate models. Their findings, published in the journal PLOS ONE, illustrate the importance of taking into account greenhouse gases emitted by small thaw ponds, as they could have a significant impact on climate.

"We discovered that although the small shallow ponds we studied represent only 44% of the water-covered surface in a Bylot Island valley, they generate 83% of its methane emissions," notes water sciences doctoral student Karita Negandhi.

The researchers compared ponds of different shapes and sizes, and studied their physicochemical properties and microbial ecology. To analyze the samples taken on Bylot Island in Nunavut's Sirmilik National Park, they used various methods, including radiocarbon dating, as well as new-generation molecular tools to study the sediment and water microbial communities involved in carbon transformation processes.

The isotopic signatures of the methane emitted by these small ponds indicate that this greenhouse gas comes partly from old carbon reserves that have been sequestered in the permafrost for millennia. As the permafrost thaws, organic matter is becoming more abundant, promoting the proliferation of aquatic microbes such as methanogenic Archaea, which use various sources of carbon, then release it into the atmosphere in the form of methane and CO2. Consequently, longer summers could lead to an increase in these emissions.

These small thaw ponds have been studied very little up until now, primarily because of their remote location and the attendant logistical constraints. However in the context of global warming, they are worth examining more closely, as they could have an increasingly significant incidence on the transfer of greenhouse gases into the atmosphere in the future.


'/>"/>

Contact: Gisele Bolduc
gisele.bolduc@adm.inrs.ca
418-654-2501
INRS
Source:Eurekalert

Related biology news :

1. VW tops global R&D ranking, but EU companies put in mixed performance
2. Missing heat discovery prompts new estimate of global warming
3. Global map provides new insights into land use
4. Global change: Stowaways threaten fisheries in the Arctic
5. Next-generation global e-infrastructure for taxon names registry
6. University of Louisville researchers sign global licensing agreement
7. UCLA report urges new global policy effort to tackle crisis of plastic litter in oceans
8. ImageWare Systems Provides Next Generation Cloud Identity Management and Authentication Services to Global Payouts MoneyTracTM Consolidated Payment Gateway
9. Frost & Sullivan: Global Commercial Biometrics Market to Grow Considerably as Awareness Increases
10. Global ocean currents explain why Northern Hemisphere is the soggier one
11. Historic trends predict future global reforestation unlikely
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/23/2017)... , May 23, 2017  Hunova, the first robotic gym for ... has been officially launched in Genoa, Italy . The ... and the USA . The technology was ... the market by the IIT spin-off Movendo Technology thanks to a 10 ... Multimedia News Release, please click: ...
(Date:4/19/2017)... 2017 The global military biometrics ... marked by the presence of several large global players. ... five major players - 3M Cogent, NEC Corporation, M2SYS ... nearly 61% of the global military biometric market in ... global military biometrics market boast global presence, which has ...
(Date:4/11/2017)... PALM BEACH GARDENS, Fla. , April 11, ... biometric identity management and secure authentication solutions, today ... million contract by Intelligence Advanced Research Projects Activity ... technologies for IARPA,s Thor program. "Innovation ... the onset and IARPA,s Thor program will allow ...
Breaking Biology News(10 mins):
(Date:10/9/2017)... SAN DIEGO , Oct. 9, 2017 /PRNewswire/ ... a biological mechanism by which its ProCell stem ... of critical limb ischemia.  The Company, demonstrated that ... the amount of limbs saved as compared to ... of the molecule HGF resulted in reduction of ...
(Date:10/9/2017)... Charlotte, N.C. (PRWEB) , ... October 09, 2017 , ... ... Purple announced Dr. Christopher Stubbs, a professor in Harvard University’s Departments of Physics and ... Dr. Stubbs was a member of the winning team for the 2015 Breakthrough Prize ...
(Date:10/9/2017)... ... October 09, 2017 , ... ... October 5, 2017, in the medical journal, Epilepsia, Brain Sentinel’s SPEAC® System ... standard, video EEG, in detecting generalized tonic-clonic seizures (GTCS) using surface electromyography ...
(Date:10/7/2017)... WA (PRWEB) , ... October ... ... industry leader in Hi-C-based genomic technologies, launched its ProxiMeta™ Hi-C metagenome deconvolution ... ProxiMeta Hi-C kit and accompanying cloud-based bioinformatics software to perform Hi-C metagenome ...
Breaking Biology Technology: