{"id":181030,"date":"2025-11-11T15:05:00","date_gmt":"2025-11-11T14:05:00","guid":{"rendered":"https:\/\/cms-articles.softonic.io\/es\/?p=401558"},"modified":"2025-11-11T16:01:54","modified_gmt":"2025-11-11T15:01:54","slug":"ils-viennent-de-decouvrir-un-morceau-de-glace-vieux-de-6-millions-dannees-en-antarctique","status":"publish","type":"post","link":"https:\/\/cms-articles.softonic.io\/fr\/ils-viennent-de-decouvrir-un-morceau-de-glace-vieux-de-6-millions-dannees-en-antarctique\/","title":{"rendered":"Ils viennent de d\u00e9couvrir un morceau de glace vieux de 6 millions d&#039;ann\u00e9es en Antarctique"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Une \u00e9quipe de scientifiques a r\u00e9ussi \u00e0 extraire des \u00e9chantillons de glace vieux de 6 millions d&#8217;ann\u00e9es dans les collines Allan gel\u00e9es, \u00e0 l&#8217;est de l&#8217;Antarctique, marquant une \u00e9tape importante dans l&#8217;histoire de la recherche climatique.<\/p>\n\n\n<p class=\"wp-block-paragraph\">Cette d\u00e9couverte, la plus ancienne jamais dat\u00e9e directement, a \u00e9t\u00e9 men\u00e9e par Sarah Shackleton de l&#8217;Institut oc\u00e9anographique Woods Hole et John Higgins de l&#8217;Universit\u00e9 de Princeton, et a \u00e9t\u00e9 publi\u00e9e dans la revue PNAS le 28 octobre.<\/p>\n\n\n<p class=\"wp-block-paragraph\">Les bulles d&#8217;air pi\u00e9g\u00e9es dans la glace, provenant d&#8217;une \u00e9poque o\u00f9 la Terre \u00e9tait remarquablement plus chaude, ont servi de capsule temporelle, offrant un aper\u00e7u unique du climat terrestre durant le Mioc\u00e8ne.<\/p>\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-twitter wp-block-embed-twitter\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\"><p lang=\"en\" dir=\"ltr\">An untouched world under Antarctica hasn\u2019t seen sunlight in 34 million years.<br><br>Buried beneath 1.2 miles (2 kilometers) of ice in East Antarctica, scientists have revealed an ancient terrain sculpted by rivers and preserved through eons. By combining satellite radar with airborne\u2026 <a href=\"https:\/\/t.co\/EDZxpA1JcG\">pic.twitter.com\/EDZxpA1JcG<\/a><\/p>&mdash; Massimo (@Rainmaker1973) <a href=\"https:\/\/twitter.com\/Rainmaker1973\/status\/1985008279185969484?ref_src=twsrc%5Etfw\">November 2, 2025<\/a><\/blockquote><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script>\n<\/div><\/figure>\n\n\n<h2 class=\"wp-block-heading\">Une enqu\u00eate qui ouvre de nombreuses possibilit\u00e9s<\/h2>\n\n\n<p class=\"wp-block-paragraph\"><strong>Les chercheurs ont d\u00e9termin\u00e9 l&#8217;\u00e2ge de la glace en utilisant la datation par isotopes d&#8217;argon dans ces bulles<\/strong>, une m\u00e9thode qui permet une datation directe sans avoir besoin d&#8217;analyser le sol ou les roches environnantes.<\/p>\n\n\n<p class=\"wp-block-paragraph\">Les analyses ont r\u00e9v\u00e9l\u00e9 que <strong>la r\u00e9gion des Allan Hills s&#8217;est refroidie d&#8217;environ 12 \u00b0C au cours des 6 derniers millions d&#8217;ann\u00e9es<\/strong>, offrant ainsi la premi\u00e8re preuve quantifi\u00e9e du refroidissement en Antarctique depuis cette ancienne p\u00e9riode chaude.<\/p>\n\n\n<p class=\"wp-block-paragraph\">Ed Brook, directeur de COLDEX et pal\u00e9oclimatologue \u00e0 l&#8217;Universit\u00e9 d&#8217;\u00c9tat de l&#8217;Oregon, a soulign\u00e9 l&#8217;importance de ces carottes de glace, car elles serviront de \u00ab clich\u00e9s climatiques \u00bb, doublant l&#8217;anciennet\u00e9 des enregistrements pr\u00e9c\u00e9dents.<\/p>\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-twitter wp-block-embed-twitter\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\"><p lang=\"en\" dir=\"ltr\">More than 5 miles of glacial ice in Antarctica vanished in only two months, retreating 10 times faster than the previous record, with possible implications for the stability of other glaciers and the pace of sea-level rise.<a href=\"https:\/\/t.co\/hH5130nvvA\">https:\/\/t.co\/hH5130nvvA<\/a><\/p>&mdash; The Washington Post (@washingtonpost) <a href=\"https:\/\/twitter.com\/washingtonpost\/status\/1986078808768737779?ref_src=twsrc%5Etfw\">November 5, 2025<\/a><\/blockquote><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script>\n<\/div><\/figure>\n\n\n<p class=\"wp-block-paragraph\">Cette d\u00e9couverte se pr\u00e9sente \u00e0 un moment critique, car le r\u00e9chauffement climatique, aliment\u00e9 par les \u00e9missions humaines de gaz \u00e0 effet de serre, modifie rapidement le climat terrestre.<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>Les scientifiques esp\u00e8rent que l&#8217;\u00e9tude de ces anciennes bulles d&#8217;air les aidera \u00e0 reconstruire les concentrations de gaz \u00e0 effet de serre du pass\u00e9 <\/strong>et \u00e0 identifier les facteurs naturels derri\u00e8re le changement climatique tout au long de l&#8217;histoire de la plan\u00e8te.<\/p>\n\n\n<p class=\"wp-block-paragraph\">Avec cette d\u00e9couverte r\u00e9ussie, l&#8217;\u00e9quipe de COLDEX pr\u00e9voit de retourner \u00e0 Allan Hills entre 2026 et 2031 pour effectuer d&#8217;autres forages et r\u00e9cup\u00e9rer des \u00e9chantillons encore plus anciens, \u00e9largissant ainsi notre compr\u00e9hension du climat de la Terre \u00e0 des \u00e9poques lointaines.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une \u00e9quipe de scientifiques a r\u00e9ussi \u00e0 extraire des \u00e9chantillons de glace vieux de 6 millions d&#8217;ann\u00e9es dans les collines gel\u00e9es Allan, \u00e0 l&#8217;est de l&#8217;Antarctique, marquant un jalon dans l&#8217;histoire de la recherche climatique. Cette d\u00e9couverte, la plus ancienne jamais dat\u00e9e directement, a \u00e9t\u00e9 dirig\u00e9e par Sarah Shackleton de l&#8217;Institut oc\u00e9anographique Woods Hole et John Higgins de l&#8217;Universit\u00e9 de Princeton, et a \u00e9t\u00e9 publi\u00e9e dans la revue PNAS le 28 octobre. Les bulles d&#8217;air pi\u00e9g\u00e9es dans la glace, provenant d&#8217;une \u00e9poque o\u00f9 la Terre \u00e9tait remarquablement plus chaude, ont servi de capsule [&hellip;]<\/p>\n","protected":false},"author":9317,"featured_media":181031,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","wpcf-pageviews":0},"categories":[16761],"tags":[17057],"usertag":[],"vertical":[],"content-category":[],"class_list":["post-181030","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-ciencia"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/posts\/181030","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/users\/9317"}],"replies":[{"embeddable":true,"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/comments?post=181030"}],"version-history":[{"count":2,"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/posts\/181030\/revisions"}],"predecessor-version":[{"id":181040,"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/posts\/181030\/revisions\/181040"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/media\/181031"}],"wp:attachment":[{"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/media?parent=181030"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/categories?post=181030"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/tags?post=181030"},{"taxonomy":"usertag","embeddable":true,"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/usertag?post=181030"},{"taxonomy":"vertical","embeddable":true,"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/vertical?post=181030"},{"taxonomy":"content-category","embeddable":true,"href":"https:\/\/cms-articles.softonic.io\/fr\/wp-json\/wp\/v2\/content-category?post=181030"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}