{"id":9669,"date":"2021-05-20T12:12:38","date_gmt":"2021-05-20T10:12:38","guid":{"rendered":"https:\/\/www.culturalusa.com\/news\/?p=9669"},"modified":"2021-05-20T12:27:58","modified_gmt":"2021-05-20T10:27:58","slug":"climat-le-plus-gros-iceberg-existant-se-detache-de-lantarctique","status":"publish","type":"post","link":"https:\/\/www.culturalusa.com\/news\/technologie\/climat-le-plus-gros-iceberg-existant-se-detache-de-lantarctique\/","title":{"rendered":"Climat: le plus gros iceberg existant se d\u00e9tache de l&rsquo;Antarctique"},"content":{"rendered":"<p><strong>Un iceberg le plus gros au monde, d&rsquo;une taille \u00e9quivalente \u00e0 la moiti\u00e9 de l&rsquo;\u00eele de Corse<\/strong>,\u00a0 s&rsquo;est d\u00e9tach\u00e9 de la barri\u00e8re de glace de Ronne en Antarctique, selon des images d&rsquo;un satellite du programme europ\u00e9en Copernicus, a annonc\u00e9 l&rsquo;Agence spatiale europ\u00e9enne.<\/p>\n<h2>L&rsquo;iceberg, baptis\u00e9 A-76, fait environ 170 km de long sur 25 km de large, pour une surface totale de 4.320 km2. Il s&rsquo;est d\u00e9tach\u00e9 dans la mer de Weddell, selon un communiqu\u00e9 de l&rsquo;Agence Spatiale Europ\u00e9enne.<\/h2>\n<p>Il a \u00e9t\u00e9 rep\u00e9r\u00e9 initialement par le British Antarctic Survey (BAS), un organisme de recherches britannique sur les zones polaires qui a une base non loin.<\/p>\n<p>Jusqu&rsquo;au A-76, le plus gros iceberg \u00e9tait le A-23A, d&rsquo;une surface de 3.380 km2, d\u00e9rivant dans la mer de Weddell, selon l&rsquo;ESA.<\/p>\n<blockquote><p>Les images de l&rsquo;\u00e9norme bloc de glace A-76 ont \u00e9t\u00e9 prises par le satellite Sentinel-1 dans le cadre du programme europ\u00e9en d&rsquo;observation de la Terre Copernicus.<\/p><\/blockquote>\n<p>Selon le Centre national am\u00e9ricain sur les glaces, cet iceberg A-76 avait commenc\u00e9 \u00e0 se s\u00e9parer le 13 mai de la barri\u00e8re de Ronne.<\/p>\n<p>La station polaire britannique situ\u00e9e sur la banquise de Brunt, toujours sur la mer de Weddell, avait d\u00e9j\u00e0 \u00e9t\u00e9 le t\u00e9moin en f\u00e9vrier de la rupture d&rsquo;un iceberg de 1.270 km2.<\/p>\n<p>En novembre 2020, un autre iceberg g\u00e9ant, qui avait \u00e9t\u00e9 en son temps le plus grand du monde en 2017, s&rsquo;\u00e9tait dangereusement approch\u00e9 d&rsquo;une \u00eele recul\u00e9e de l&rsquo;Atlantique Sud, mena\u00e7ant des colonies de manchots et de phoques, finalement sans cons\u00e9quence d\u00e9sastreuse.<\/p>\n<p>Cet iceberg, appel\u00e9 A68, s&rsquo;\u00e9tait s\u00e9par\u00e9 d&rsquo;une gigantesque plateforme de glace, nomm\u00e9e Larsen C, la privant de 12 % de sa superficie et la rendant ainsi plus instable. D&rsquo;autres parties de cette barri\u00e8re de Larsen, \u00e0 la pointe de la p\u00e9ninsule antarctique, s&rsquo;\u00e9taient d\u00e9sint\u00e9gr\u00e9es en quelques semaines en 1995 et en 2002.<\/p>\n<h3>La plan\u00e8te s&rsquo;est r\u00e9chauff\u00e9e de plus de 1\u00b0C depuis l&rsquo;\u00e8re pr\u00e9-industrielle en raison de l&rsquo;augmentation des \u00e9missions de gaz \u00e0 effet de serre provoqu\u00e9es par les activit\u00e9s humaines. Mais l&rsquo;Antarctique s&rsquo;est r\u00e9chauff\u00e9 deux fois plus vite.<\/h3>\n<p>La formation des icebergs est un processus naturel que le r\u00e9chauffement de l&rsquo;air et des oc\u00e9ans contribue cependant \u00e0 acc\u00e9l\u00e9rer, selon les scientifiques.<\/p>\n<p>Les icebergs sont traditionnellement baptis\u00e9s par une lettre correspondant \u00e0 la partie de l&rsquo;Antarctique o\u00f9 ils sont originellement d\u00e9tect\u00e9s, suivie d&rsquo;un num\u00e9ro.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un iceberg le plus gros au monde, d&rsquo;une taille \u00e9quivalente \u00e0 la moiti\u00e9 de l&rsquo;\u00eele de Corse,\u00a0 s&rsquo;est d\u00e9tach\u00e9 de la barri\u00e8re de glace de Ronne en Antarctique, selon des images d&rsquo;un satellite du programme europ\u00e9en Copernicus, a annonc\u00e9 l&rsquo;Agence spatiale europ\u00e9enne. L&rsquo;iceberg, baptis\u00e9 A-76, fait environ 170 km de long sur 25 km de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9670,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[1238,1163,208,1162],"class_list":["post-9669","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologie","tag-agence-spatiale-europeenne","tag-antarctique","tag-climat","tag-iceberg"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Un iceberg le plus gros au monde, d&#039;une taille \u00e9quivalente \u00e0 la moiti\u00e9 de l&#039;\u00eele de Corse, s&#039;est d\u00e9tach\u00e9 de la barri\u00e8re de glace de Ronne en Antarctique, selon des images d&#039;un satellite du programme europ\u00e9en Copernicus, a annonc\u00e9 l&#039;Agence spatiale europ\u00e9enne. 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