{"id":379,"date":"2015-04-08T00:00:00","date_gmt":"2015-04-07T22:00:00","guid":{"rendered":"https:\/\/site.uit.no\/cage\/2015\/04\/08\/blog-measuring-greenhouse-gases-in-the-arctic\/"},"modified":"2023-04-04T10:34:06","modified_gmt":"2023-04-04T08:34:06","slug":"blog-measuring-greenhouse-gases-in-the-arctic","status":"publish","type":"post","link":"https:\/\/site.uit.no\/cage\/2015\/04\/08\/blog-measuring-greenhouse-gases-in-the-arctic\/","title":{"rendered":"Blog: Measuring greenhouse gases in the Arctic"},"content":{"rendered":"

Our post. doc Anna Silyakova spent six weeks frozen into an ice floe in the Arctic Ocean on board the research vessel\u00a0Lance<\/em>. In this blog post you can read more about the experiments she conducted in the ice.<\/h4>\n
Text: Daiki Nomura ( Hokkaido University) and Anna Silyakova (CAGE). Blog was previously published\u00a0by Norwegian Polar Institute.<\/a><\/h6>\n

<\/p>\n

We are on the N-ICE2015<\/a> cruise to study the chemistry of greenhouse gases in seawater, sea ice, and the atmosphere. We are particularly interested in vertical fluxes through sea ice and snow, of such important greenhouse gases as carbon dioxide (CO2<\/sub>), methane (CH4<\/sub>) and bromoform (CHBr3<\/sub>).<\/p>\n

One of our primary tasks is to collect samples of seawater from the twice-weekly\u00a0CTD<\/abbr>\u00a0casts. These water samples will later be analyzed back home for concentration of dissolved gases, which will provide information on how carbon dioxide, methane, and bromoform are distributed in the water column under sea ice, down to a depth of 1000\u00a0metres.<\/p>\n

Collecting ice cores and brine<\/h2>\n

We also collect ice cores from different places around the ice floe, which varies in thickness from 40\u00a0cm to 3.6\u00a0meters. The cores are cut into 10\u00a0cm sections, melted at room temperature over a couple of days, and then the melted water is collected for analysis (see picture). After analyses are done, we get the vertical distribution of gasses throughout sea ice. Samples are also taken from melted snow and slush on top of the sea ice to see how the concentrations of these differ from the sea ice.<\/p>\n

\"We<\/a>
We pack ice sections into gas tight bag and evacuate air from it. We want the sections to melt in a vacuum in order to avoid any contamination of ambient air in our samples. Photo: Anna Silyakova \/ Norwegian Polar Institute<\/figcaption><\/figure>\n

In addition, we collect brine, which is a highly concentrated solution of many chemical elements including the dissolved gases which we are interested in. The salinity of the brine on our ice floe is more than 100\u00a0psu\u2014much higher than the concentration of seawater, which is 35\u00a0psu.<\/p>\n

Atmospheric measurements<\/h2>\n

In the atmosphere, we are measuring carbon dioxide and methane fluxes (from\/to snow and sea ice surface) using two different techniques. One technique is called\u00a0eddy covariance<\/em>. This method gives the flux from an area of 500\u00a0meters around the eddy covariance mast, where the gas analyzers are mounted.<\/p>\n

The other technique involves so-called\u00a0flux chambers<\/em>. Flux chambers look like big casserole dishes that are flipped over and put on top of ice and snow. If there is outgassing from the ice surface, gases (i.e. methane, carbon dioxide or bromoform) will accumulate under the chamber over time. The gas fluxes are determined by sampling the gas under the chamber every 10\u00a0minutes for a total of 30\u00a0minutes in order to detect changes in concentration over time.<\/p>\n

For all of this work, we must carry a small chemistry laboratory with us to each sampling site. Our laboratory fits into several boxes and includes different sorts of flasks, bottles, syringes, tubes, chemicals, pipettes, and of course; laboratory sterile gloves.<\/p>\n

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

Our post. doc Anna Silyakova spent six weeks frozen into an ice floe in the … <\/p>\n

Read more \u00abBlog: Measuring greenhouse gases in the Arctic\u00bb<\/span><\/a><\/p>\n","protected":false},"author":123546,"featured_media":381,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9],"tags":[],"class_list":["post-379","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"yoast_head":"\nBlog: Measuring greenhouse gases in the Arctic - CAGE, Centre for Arctic Gas Hydrate, Environment and Climate<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/site.uit.no\/cage\/2015\/04\/08\/blog-measuring-greenhouse-gases-in-the-arctic\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Blog: Measuring greenhouse gases in the Arctic - 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