{"id":15140,"date":"2021-12-05T15:52:08","date_gmt":"2021-12-05T15:52:08","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/larctique-a-commence-a-se-rechauffer-des-decennies-plus-tot-questime-alertent-des-chercheurs"},"modified":"2021-12-05T17:16:43","modified_gmt":"2021-12-05T17:16:43","slug":"larctique-a-commence-a-se-rechauffer-des-decennies-plus-tot-questime-alertent-des-chercheurs","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/larctique-a-commence-a-se-rechauffer-des-decennies-plus-tot-questime-alertent-des-chercheurs","title":{"rendered":"L&rsquo;Arctique a commenc\u00e9 \u00e0 se r\u00e9chauffer des d\u00e9cennies plus t\u00f4t qu\u2019estim\u00e9, alertent des chercheurs"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Tchad. <\/strong><\/span>L&rsquo;oc\u00e9an Arctique se r\u00e9chauffe depuis le d\u00e9but du XXe si\u00e8cle, des d\u00e9cennies plus t\u00f4t que ce que les observations et calculs pr\u00e9c\u00e9dents ont laiss\u00e9 supposer, alertent des scientifiques de l&rsquo;universit\u00e9 de Cambridge dans une nouvelle \u00e9tude.<\/p>\n<p>La temp\u00e9rature de l&rsquo;eau de l&rsquo;oc\u00e9an Arctique a commenc\u00e9 \u00e0 monter des d\u00e9cennies plus t\u00f4t que pr\u00e9vu, ont conclu des scientifiques de l&rsquo;universit\u00e9 de Cambridge qui publient les r\u00e9sultats de leur \u00e9tude dans la revue Science Advances.<\/p>\n<p>L&rsquo;\u00e9quipe des chercheurs a reconstitu\u00e9 l&rsquo;histoire du r\u00e9chauffement de l&rsquo;oc\u00e9an dans la zone du d\u00e9troit de Fram, entre l&rsquo;\u00eele du Groenland et l&rsquo;archipel de Svalbard. L&rsquo;oc\u00e9an Atlantique, dont les eaux se jettent dans l&rsquo;oc\u00e9an Arctique, est \u00e0 l&rsquo;origine du r\u00e9chauffement et du changement de composition de l\u2019eau, selon eux. En cons\u00e9quence, les temp\u00e9ratures ont augment\u00e9 d&rsquo;environ 2\u00b0C depuis 1900, la glace de mer a recul\u00e9 et la salinit\u00e9 a augment\u00e9.<\/p>\n<p>Les auteurs de cette \u00e9tude pr\u00e9cisent que ce sont les eaux de l&rsquo;oc\u00e9an Arctique qui se r\u00e9chauffent le plus rapidement. Avec le r\u00e9chauffement, la glace de la r\u00e9gion polaire fond, ce qui fait monter le niveau des mers.<\/p>\n<p>La hausse continue des temp\u00e9ratures entra\u00eenera la disparition progressive du perg\u00e9lisol dans l&rsquo;Arctique, o\u00f9 d&rsquo;\u00e9normes quantit\u00e9s de m\u00e9thane se sont accumul\u00e9es. Il s&rsquo;agit d&rsquo;un gaz \u00e0 effet de serre plus n\u00e9faste que le dioxyde de carbone, ont averti les scientifiques.<\/p>\n<p>Ils pr\u00e9voient de poursuivre l&rsquo;\u00e9tude des mod\u00e8les climatiques afin de mieux comprendre l'\u00a0\u00bbatlantisation\u00a0\u00bb de l&rsquo;oc\u00e9an Arctique. Les scientifiques ne savent \u00e9galement pas exactement quel r\u00f4le, dans le cas o\u00f9 il y en aurait un, le changement climatique d&rsquo;origine humaine a jou\u00e9 dans le r\u00e9chauffement pr\u00e9coce de l&rsquo;Arctique, et des recherches suppl\u00e9mentaires sont n\u00e9cessaires.<\/p>\n<p>La fonte des glaces dans l&rsquo;Arctique avait d\u00e9j\u00e0 atteint des niveaux record au cours des deux derni\u00e8res ann\u00e9es, selon un rapport annuel sur l\u2019\u00e9tat des oc\u00e9ans, pr\u00e9par\u00e9 par 120 scientifiques de plus de 30 institutions europ\u00e9ennes et publi\u00e9 le 22 septembre dans le Journal of Operational Oceanography.<\/p>\n<p>Depuis 1979, les niveaux de glace enregistr\u00e9s en Arctique par d\u00e9cennie ont baiss\u00e9 en moyenne de 13%. Le r\u00e9chauffement de l&rsquo;oc\u00e9an Arctique contribue \u00e0 environ 4% du r\u00e9chauffement global des oc\u00e9ans.<\/p>\n<p>Le secr\u00e9taire g\u00e9n\u00e9ral de l&rsquo;Onu, Antonio Guterres, a \u00e9galement sonn\u00e9 l\u2019alarme le 17 septembre, avertissant que selon un rapport de la Convention-cadre des Nations unies sur les changements climatiques, \u00ab\u00a0le monde est sur un chemin catastrophique vers +2,7\u00b0C de r\u00e9chauffement\u00a0\u00bb.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/tchad\">Tchad<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Tchad. L&rsquo;oc\u00e9an Arctique se r\u00e9chauffe depuis le d\u00e9but du XXe si\u00e8cle, des d\u00e9cennies plus t\u00f4t que ce que les observations et calculs pr\u00e9c\u00e9dents ont laiss\u00e9 supposer, alertent des scientifiques de l&rsquo;universit\u00e9 de Cambridge dans une nouvelle \u00e9tude. La temp\u00e9rature de l&rsquo;eau de l&rsquo;oc\u00e9an Arctique a commenc\u00e9 \u00e0 monter des d\u00e9cennies plus t\u00f4t que [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":15139,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[37,292,2873,29],"class_list":["post-15140","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-tchad","tag-rechauffe","tag-tchad"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>L&#039;Arctique a commenc\u00e9 \u00e0 se r\u00e9chauffer des d\u00e9cennies plus t\u00f4t qu\u2019estim\u00e9, alertent des chercheurs - tchad<\/title>\n<meta name=\"description\" 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