{"id":6578,"date":"2021-08-16T11:06:23","date_gmt":"2021-08-16T09:06:23","guid":{"rendered":"https:\/\/site.uit.no\/cage\/?p=6578"},"modified":"2023-04-04T10:29:09","modified_gmt":"2023-04-04T08:29:09","slug":"return-from-the-forest-of-the-10000-flares","status":"publish","type":"post","link":"https:\/\/site.uit.no\/cage\/2021\/08\/16\/return-from-the-forest-of-the-10000-flares\/","title":{"rendered":"Return from the forest of the 10,000 flares"},"content":{"rendered":"

Text and photos: Mauro Pau<\/p>\n

\"\"<\/p>\n

A fun moment during the working on the just acquired core.<\/em><\/p>\n

Here are some personal impressions from cruise CAGE21-4 to the central Barents Sea. Let’s start with the negatives. Unless this cruise was sponsored by a known milk brand, there is no excuse UiT cannot provide decent quality drinking water to its employees. A few of those big water jugs can only be beneficial for future cruises on R\/V Helmer Hanssen.<\/p>\n

\"\"<\/p>\n

Sediment for headspace gas analysis is sampled from the freshly exposed base of a core section.<\/em><\/p>\n

Apart from that, what a valuable experience it has been. I enjoyed the hands-on working, for instance when collecting sediment samples for headspace gas analysis, which I had never done before. I am also glad for the practice gained at multibeam water column image interpretation while picking gas flares (altogether we identified over ten thousand flares).<\/p>\n

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Henry brings a core section into the lab.<\/em><\/p>\n

\"\"<\/p>\n

Preparation of the core for storage.<\/em><\/p>\n

This cruise has been filled with many moments of awe. On one occasion, I was drawing porewater into vials containing mercury chloride (the most toxic chemical I have ever used), and saw them turning each a different shade of yellow, reflecting increasing sulphide concentration downcore. Sulphide is a product of the aerobic oxidation of methane in the sediments, so just by looking at the colour of the vials one can infer that there is a strong methane flux in that environment.<\/p>\n

\"\"<\/p>\n

Porewater is collected from cores using rhizon samplers, polymer tubes inserted into the sediment and fitted to low-pressurised syringes.<\/em><\/p>\n

\"\"<\/p>\n

Mercury chloride is an extremely toxic chemical, and we add it to stop microbial activity in porewater samples. Incidentally, it reacts with sulphide ions forming mercury sulphide, a solid precipitation of yellow colour. The darker the yellow, the higher concentration of sulphide.<\/em><\/p>\n

We spotted several whales and dolphins along our way. One memorable scene was when an oil sampling trip on the dinghy boat turned into a whale safari. A finback whale at least three times the size of the boat materialised out of the blue. We were struck by her sound; the photo does not do justice to how amazing it was to be there.<\/p>\n

\"\"<\/p>\n

A finback whale pays us a visit and inquires about our research.<\/em><\/p>\n

 <\/p>\n

Fishcakes and porridge for breakfast has been yet another experience, most likely a unique one, though I’m glad I can now brag about it.<\/p>\n","protected":false},"excerpt":{"rendered":"

Text and photos: Mauro Pau A fun moment during the working on the just acquired … <\/p>\n

Read more \u00abReturn from the forest of the 10,000 flares\u00bb<\/span><\/a><\/p>\n","protected":false},"author":123546,"featured_media":6583,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[120,141],"tags":[],"class_list":["post-6578","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cruise-blog","category-hopendjupet-cage21-4-cruise"],"acf":[],"yoast_head":"\nReturn from the forest of the 10,000 flares - 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\/2021\/08\/16\/return-from-the-forest-of-the-10000-flares\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Return from the forest of the 10,000 flares - 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