Reference number : GC-2017-Q1-01499, amendment number : , agreement type : G, recipient legal name : Tortell, Philippe (The University of British Columbia), recipient country : CA, recipient province : nan, recipient city : British Columbia|Colombie-Britannique, recipient postal code : nan, program name english : Discovery Grants Program - Individual, program name french : Programme de subventions à la découverte - individuelles, program purpose english : Arctic and Subarctic marine waters play a large role in controlling the atmospheric concentration of various gases that influence Earth&rsquo;s climate. Methane (CH 4 ) and nitrous oxide (N 2 O) are potent greenhouse gases acting to warm the planet, while dimethylsulfide (DMS), a trace gas produced by marine microbes, promotes the formation of clouds and atmospheric aerosols that back-scatter incoming solar radiation and act to cool the planet. The concentration and sea-air exchange of these 'climate-active' gases are influenced through the interplay of physical, chemical and biological processes, and sensitive to climate-driven shifts in oceanic conditions. At present, the magnitude of these potential climate-dependent changes is poorly constrained by direct observations. The proposed research program will collect fundamental data on the concentrations and biological / chemical cycles of DMS, CH 4 and N 2 O in surface ocean waters. The principle research objectives are to: 1) quantify the spatial and temporal variability of these gases in Arctic and Subarctic marine waters across a range of oceanographic conditions; and 2) use isotope-labeling experiments to quantify the rates of key production and consumption in the DMS, CH 4 and N 2 O cycles. The results from this work will advance our understanding of potential climate-dependent changes in the oceanic production of these gases over the coming decades. 
 
Ship-based field surveys will be used to map the concentrations of CH 4 , N 2 O and DMS in coastal and offshore waters of the Subarctic Pacific, and in the Canadian Arctic Ocean. Measurements will be conducted using a suite of analytical methods we have developed over the past decade. Isotope labeling experiments will be used to follow the production and consumption of DMS through various pathways, and quantify the cycling of CH 4 and N 2 O through different precursor compounds. The results of the proposed work will provide new mechanistic insight into the factors regulating oceanic CH 4 , N 2 O and DMS concentrations, and their potential response to climate-sensitive variables. This, in turn, will be of great relevance to understanding the future evolution of the global climate system., program purpose french : Arctic and Subarctic marine waters play a large role in controlling the atmospheric concentration of various gases that influence Earth&rsquo;s climate. Methane (CH 4 ) and nitrous oxide (N 2 O) are potent greenhouse gases acting to warm the planet, while dimethylsulfide (DMS), a trace gas produced by marine microbes, promotes the formation of clouds and atmospheric aerosols that back-scatter incoming solar radiation and act to cool the planet. The concentration and sea-air exchange of these 'climate-active' gases are influenced through the interplay of physical, chemical and biological processes, and sensitive to climate-driven shifts in oceanic conditions. At present, the magnitude of these potential climate-dependent changes is poorly constrained by direct observations. The proposed research program will collect fundamental data on the concentrations and biological / chemical cycles of DMS, CH 4 and N 2 O in surface ocean waters. The principle research objectives are to: 1) quantify the spatial and temporal variability of these gases in Arctic and Subarctic marine waters across a range of oceanographic conditions; and 2) use isotope-labeling experiments to quantify the rates of key production and consumption in the DMS, CH 4 and N 2 O cycles. The results from this work will advance our understanding of potential climate-dependent changes in the oceanic production of these gases over the coming decades. 
 
Ship-based field surveys will be used to map the concentrations of CH 4 , N 2 O and DMS in coastal and offshore waters of the Subarctic Pacific, and in the Canadian Arctic Ocean. Measurements will be conducted using a suite of analytical methods we have developed over the past decade. Isotope labeling experiments will be used to follow the production and consumption of DMS through various pathways, and quantify the cycling of CH 4 and N 2 O through different precursor compounds. The results of the proposed work will provide new mechanistic insight into the factors regulating oceanic CH 4 , N 2 O and DMS concentrations, and their potential response to climate-sensitive variables. This, in turn, will be of great relevance to understanding the future evolution of the global climate system., agreement title english : Biogeochemical cycles of climate-active gases CH4, N2O and DMS in Arctic and Subarctic Marine Waters, agreement title french : Biogeochemical cycles of climate-active gases CH4, N2O and DMS in Arctic and Subarctic Marine Waters, agreement number : RGPIN, agreement value : 195000.0, agreement start date : 2017-05-10, agreement end date : nan, description english : nan, description french : nan, expected results english : nan, expected results french : nan, additional information english : Grant or Award spanning more than one fiscal year. (2017-2018 to 2022-2023), additional information french : Subvention ou bourse octroyée s'appliquant à plus d'un exercice financier. (2017-2018 à 2022-2023), owner organization : nserc-crsng, owner organization title : Natural Sciences and Engineering Research Council of Canada | Conseil de recherches en sciences naturelles et en génie du Canada