{"id":18496,"date":"2015-12-18T12:00:00","date_gmt":"2015-12-18T12:00:00","guid":{"rendered":"https:\/\/dev.inrs.ca\/ghg-emissions-from-canadian-arctic-aquatic-systems-dated-for-the-first-time\/"},"modified":"2020-11-02T15:18:32","modified_gmt":"2020-11-02T20:18:32","slug":"les-mares-et-les-lacs-de-lile-bylot-puits-ou-sources-de-ges","status":"publish","type":"post","link":"https:\/\/dev.inrs.ca\/en\/news\/ghg-emissions-from-canadian-arctic-aquatic-systems-dated-for-the-first-time\/","title":{"rendered":"GHG emissions from Canadian Arctic aquatic systems dated for the first time"},"content":{"rendered":"\n

For the first time, researchers have successfully dated the carbon dioxide (CO2) and methane (CH4) emitted by ponds and lakes on Bylot Island, Nunavut. <\/strong><\/strong><\/p>\n\n\n\n

\"Les<\/figure><\/div>\n\n\n\n

The research team observed significant variability in age and emission rates of greenhouse gases (GHG) from aquatic systems located in a continuous permafrost zone. The study, whose lead author is Fr\u00e9d\u00e9ric Bouchard affiliated to the\u00a0INRS Eau Terre Environnement Research Centre<\/a>\u00a0and the Geography Department of Universit\u00e9 de Montr\u00e9al, appeared in the international journal Biogeosciences.<\/strong><\/strong><\/p>\n\n\n\n

Ils ont observ\u00e9 des diff\u00e9rences significatives quant \u00e0 l’\u00e2ge et au taux d’\u00e9mission de ces gaz \u00e0 effet de serre (GES) provenant de ces \u00e9cosyst\u00e8mes aquatiques situ\u00e9s en zone de perg\u00e9lisol. Ces r\u00e9sultats sont publi\u00e9s dans un article de la revue internationale Biogeosciences, dont le premier auteur est le chercheur postdoctoral Fr\u00e9d\u00e9ric Bouchard du Centre Eau Terre Environnement de l\u2019INRS<\/a> et du D\u00e9partement de g\u00e9ographie de l\u2019Universit\u00e9 de Montr\u00e9al.\u00a0<\/p>\n\n\n\n

\"Les<\/figure><\/div>\n\n\n\n

Gas samples taken over the summer showed strikingly different ages and emission rates depending on the size and depth of the water bodies. Carbon-14 dating revealed that gas emitted by shallow ponds was a few centuries old, making it relatively \u201cyoung\u201d. Certain ponds, covered by cyanobacterial mats, were identified as CO2 sinks and sources of CH4; others, with eroded banks, were significant emitters of both GHG. Compared to ponds, arctic lakes were found to release much older GHG\u2014up to 3,500 years old in the case of CH4\u2014but at a much slower rate, at least in summer.\u00a0<\/p>\n\n\n\n

\u201cThis study demonstrates the significant impact of the combined geomorphological, limnological, and hydrological properties of aquatic systems on CO2 and CH4 emissions caused by thawing permafrost.\u201d\u00a0<\/p> Isabelle Laurion<\/cite><\/blockquote>\n\n\n\n

The research team approach enabled an estimation of GHG emissions caused by two distinct processes: diffusion and ebullition. Researchers found that diffusion can be a significant mode of emission, especially from ponds. Until now, ebullition had been considered the predominant mode of CH4 emissions in lake systems.\u00a0\u00a0\u201cThis study on the age of GHG emitted in the Canadian Arctic is one of very few using data from lakes outside of Siberia or Alaska. It sheds light on the specific role played by aquatic systems on carbon dynamics associated with thawing permafrost, and their potential impact on future climate change,\u201d stated researcher Fr\u00e9d\u00e9ric Bouchard.\u00a0<\/p>\n\n\n\n

This work sets the scene for further research that must not only measure gas exchange rates, but also account for the age of carbon emitted, since this will impact the systems\u2019 potential positive feedback effect on climate.\u00a0<\/p>\n\n\n\n

About the publication<\/strong><\/h2>\n\n\n\n
\"Les<\/figure><\/div>\n\n\n\n

This research was conducted by Fr\u00e9d\u00e9ric Bouchard,\u00a0Isabelle Laurion<\/a>, and Vilmantas Pr\u0117skienis, of the INRS Eau Terre Environnement Research Centre, along with Daniel Fortier of Universit\u00e9 de Montr\u00e9al, Xiaomei Xu of University of California, and Michael J. Whiticar of University of Victoria. The resulting article, \u201cModern to millennium\u2010old greenhouse gases emitted from ponds and lakes of the Eastern Canadian Arctic (Bylot Island, Nunavut),\u201d was recently published in the international journal Biogeosciences (DOI: 10.5194\/bg-12-7279-2015). Financial support for the research team was provided by ArcticNet, the Natural Sciences and Engineering Research Council of Canada (NSERC), Natural Resources Canada\u2019s Polar Continental Shelf Program, NSERC\u2019s Discovery Frontiers and EnviroNorth programs, and the W. Garfield Weston Foundation.\u00a0<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Pour la premi\u00e8re fois, des chercheurs ont d\u00e9termin\u00e9 l\u2019\u00e2ge du dioxyde de carbone (CO2) et du m\u00e9thane (CH4) \u00e9mis par les mares et les lacs de l\u2019\u00eele Bylot au Nunavut. <\/p>\n","protected":false},"author":1,"featured_media":3009,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[688],"tags":[],"sectors":[729,728],"class_list":["post-18496","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-innover-a-linrs-en","sectors-environnement-en","sectors-eau-en"],"acf":[],"yoast_head":"\nGHG emissions from Canadian Arctic aquatic systems dated for the first time | INRS<\/title>\n<meta name=\"description\" content=\"Pour la premi\u00e8re fois, des chercheurs ont d\u00e9termin\u00e9 l\u2019\u00e2ge du dioxyde de carbone (CO2) et du m\u00e9thane (CH4) \u00e9mis par les mares et les lacs de l\" \/>\n<meta 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