{"id":41931,"date":"2013-11-18T21:26:16","date_gmt":"2013-11-19T02:26:16","guid":{"rendered":"https:\/\/dev.inrs.ca\/?p=41931"},"modified":"2021-01-14T21:28:09","modified_gmt":"2021-01-15T02:28:09","slug":"thaw-ponds-an-unaccounted-source-of-greenhouse-gas","status":"publish","type":"post","link":"https:\/\/dev.inrs.ca\/en\/news\/thaw-ponds-an-unaccounted-source-of-greenhouse-gas\/","title":{"rendered":"Thaw ponds: an unaccounted source of greenhouse gas"},"content":{"rendered":"\n

Ph.D. student Karita Negandhi and professor Isabelle Laurion<\/a> from INRS\u2019Eau Terre Environnement Research Centre<\/a>, in collaboration with other Canadian, U.S., and French researchers, have been studying methane emissions produced by thawing permafrost in the Canadian Arctic.<\/strong><\/p>\n\n\n\n

<\/div>\n\n\n\n

These emissions are greatly underestimated in current climate models. Their findings, published in the journal PLoS ONE<\/a>, <\/em>illustrate the importance of taking into account greenhouse gases emitted by small thaw ponds, as they could have a significant impact on climate.<\/p>\n\n\n\n

\u201cWe 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,\u201d notes water sciences doctoral student Karita Negandhi.<\/p>\n\n\n\n

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

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\u2019s 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.<\/p>\n\n\n\n

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 C02<\/sub>. Consequently, longer summers could lead to an increase in these emissions.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n


About the article<\/h3>\n\n\n\n

The article entitled \u201cSmall thaw ponds: an unaccounted source of methane in the Canadian High Arctic<\/a>\u201d appeared in PLoS ONE<\/em> on November 13, 2013. The authors are Karita Neghandhi and Isabelle Laurion from Centre Eau Terre Environnement at INRS and Centre d\u2019\u00e9tudes nordiques, Michael J. Whiticar from the University of Victoria, Pierre E. Galand from Observatoire oc\u00e9anologique de Banyuls-sur-mer, Xiaomei Xu from the University of California, and Connie Lovejoy from Universit\u00e9 Laval.<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Ph.D. student Karita Negandhi and professor Isabelle Laurion from INRS\u2019Eau 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.<\/p>\n","protected":false},"author":3,"featured_media":2214,"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-41931","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":"\nThaw ponds: an unaccounted source of greenhouse gas | News | INRS<\/title>\n<meta name=\"description\" content=\"Ph.D. student Karita Negandhi and professor Isabelle Laurion from INRS\u2019Eau Terre Environnement Research Centre, in collaboration with other 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