{"id":436,"date":"2015-10-06T00:00:00","date_gmt":"2015-10-05T22:00:00","guid":{"rendered":"https:\/\/site.uit.no\/cage\/2015\/10\/06\/aleksey-portnov-defends-thesis-on-permafrost\/"},"modified":"2023-04-04T10:33:52","modified_gmt":"2023-04-04T08:33:52","slug":"aleksey-portnov-defends-thesis-on-permafrost","status":"publish","type":"post","link":"https:\/\/site.uit.no\/cage\/2015\/10\/06\/aleksey-portnov-defends-thesis-on-permafrost\/","title":{"rendered":"Aleksey Portnov defends thesis on permafrost"},"content":{"rendered":"<h4>Congratulations to Dr. Portnov who recently defended his thesis\u00a0<em>Role of subsea permafrost and gas hydrate in postglacial Arctic methane releases<\/em>.<\/h4>\n<h6>Text: Maja Sojtaric<\/h6>\n<p><!--more--><\/p>\n<p>Focus area of research in the doctoral thesis defended by CAGE candidate Aleksey Portnov\u00a0at <strong><a href=\"https:\/\/uit.no\/startsida\" target=\"_blank\" rel=\"noopener\">UiT The Arctic University of Troms\u00f8<\/a><\/strong>, is subsea permafrost in South Kara Sea, more specifically the\u00a0shallow area offshore Siberian West Yamal Peninsula.\u00a0It was previously proposed that the permafrost in the Kara Sea, and other Arctic areas, extends to water depths up to 100 meters, creating a seal that methane stored underneath\u00a0cannot bypass. Portnov and collegues have found that <strong><a href=\"https:\/\/site.uit.no\/cage\/news\/methane-leaking-permafrost-seal-offshore-siberia\/\" target=\"_blank\" rel=\"noopener\">the West Yamal shelf is leaking, profoundly, at depths much shallower than that.\u00a0<\/a><\/strong><\/p>\n<p>Significant amount of methane gas\u00a0is leaking at depths between 20 and 50 meters. This suggests that a continuous permafrost seal is much smaller than proposed. Close to the shore the permafrost seal may be few hundred meters thick, but tapers off towards 20 meters water depth. And it is fragile.\u00a0Portnov used mathematical models to map the evolution of the permafrost, and thus calculate its degradation since the end of the last ice age. The evolution of permafrost gives indication to what may happen to it in the future.<\/p>\n<div>For his trial talk Aleksey Portnov focused on the role of permafrost, permafrost-related gas hydrate, and continental shelf methane emission in climate change.<\/div>\n<div><\/div>\n<div>Committee:<\/div>\n<div>\n<div>1st opponent: Prof. Christian Berndt, <a href=\"http:\/\/www.geomar.de\" target=\"_blank\" rel=\"noopener\">GEOMAR<\/a>, Kiel, Germany<\/div>\n<div>2nd opponent: Dr. Tatiana Matveeva, <a href=\"http:\/\/en.vniio.ru\" target=\"_blank\" rel=\"noopener\">VNIIOkeangeologia<\/a>, St. Petersburg, Russia<\/div>\n<div>Head of the committee: Prof. Alfred Hansen, UiT The Arctic University of\u00a0Norway.<\/div>\n<div><\/div>\n<\/div>\n<div>Supervisor for Aleksey Portnov was CAGE director, Prof. J\u00fcrgen Mienert.<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Congratulations to Dr. Portnov who recently defended his thesis\u00a0Role of subsea permafrost and gas hydrate &hellip; <\/p>\n<p class=\"read-more-link\"><a href=\"https:\/\/site.uit.no\/cage\/2015\/10\/06\/aleksey-portnov-defends-thesis-on-permafrost\/\">Read more<span class=\"screen-reader-text\"> \u00abAleksey Portnov defends thesis on permafrost\u00bb<\/span><\/a><\/p>\n","protected":false},"author":123546,"featured_media":437,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,146],"tags":[],"class_list":["post-436","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-phd-defenses"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aleksey Portnov defends thesis on permafrost - 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\/10\/06\/aleksey-portnov-defends-thesis-on-permafrost\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aleksey Portnov defends thesis on permafrost - CAGE, Centre for Arctic Gas Hydrate, Environment and Climate\" \/>\n<meta property=\"og:description\" content=\"Congratulations to Dr. Portnov who recently defended his thesis\u00a0Role of subsea permafrost and gas hydrate &hellip; 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