Navigation Links
Global warming in the Canadian Arctic

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

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:
(Date:5/9/2016)... UAE, May 9, 2016 Elevay ... comes to expanding freedom for high net worth professionals ... in today,s globally connected world, there is still no ... could ever duplicate sealing your deal with a firm ... passports by taking advantage of citizenship via investment programs ...
(Date:4/26/2016)... and LONDON , April ... part of EdgeVerve Systems, a product subsidiary of ... today announced a partnership to integrate the Onegini ...      (Logo: ) ... their customers enhanced security to access and transact ...
(Date:4/15/2016)... 15, 2016 Research and ... Biometrics Market 2016-2020,"  report to their offering.  , ... , ,The global gait biometrics market is expected ... the period 2016-2020. Gait analysis generates ... be used to compute factors that are not ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... , June 23, 2016 A person commits a ... crime scene to track the criminal down. An ... Food and Drug Administration (FDA) uses DNA evidence to track ... Sound far-fetched? It,s not. The FDA has increasingly ... support investigations of foodborne illnesses. Put as simply as possible, ...
(Date:6/23/2016)...   EpiBiome , a precision microbiome engineering company, ... financing from Silicon Valley Bank (SVB). The financing will ... its drug development efforts, as well as purchase additional ... has been an incredible strategic partner to us – ... would provide," said Dr. Aeron Tynes Hammack , ...
(Date:6/23/2016)... 23, 2016  Blueprint Bio, a company dedicated to ... medical community, has closed its Series A funding round, ... "We have received a commitment from Forentis ... need to meet our current goals," stated Matthew ... runway to complete validation on the current projects in ...
(Date:6/23/2016)... ... June 23, 2016 , ... Velocity Products, a ... designed, tuned and optimized exclusively for Okuma CNC machining centers at The International ... a collaboration among several companies with expertise in toolholding, cutting tools, machining dynamics ...
Breaking Biology Technology: