{"id":1175,"date":"2012-12-09T23:00:00","date_gmt":"2012-12-09T22:00:00","guid":{"rendered":"http:\/\/www.laterredufutur.com\/wordpress\/?p=1175"},"modified":"2012-12-09T23:00:00","modified_gmt":"2012-12-09T22:00:00","slug":"pendant-la-periode-glaciaire-les-icebergs-descendaient-jusqua-miami","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/pendant-la-periode-glaciaire-les-icebergs-descendaient-jusqua-miami\/","title":{"rendered":"Pendant la p\u00e9riode glaciaire les icebergs descendaient jusqu&rsquo;\u00e0 Miami"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\"><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"348\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/la-couche-de-glace-setend-sur-la-planete\/banquise\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/06\/banquise.jpg?fit=450%2C298&amp;ssl=1\" data-orig-size=\"450,298\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"banquise\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/06\/banquise.jpg?fit=450%2C298&amp;ssl=1\" class=\" alignleft size-full wp-image-348\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/wordpress\/wp-content\/uploads\/2011\/06\/banquise.jpg?w=120\" border=\"0\" alt=\"banquise\"  style=\"float: left;\" \/>Il y a 20 000 ans il faisait si froid que les icebergs descendaient de l&rsquo;Arctique jusqu&rsquo;au niveau de Miami. Les chercheurs ont fait cette d\u00e9couverte gr\u00e2ce aux marques que les antiques gla\u00e7ons ont laiss\u00e9 sur les fonds marins floridiens. D&rsquo;immenses inondations d&rsquo;eau douce en provenance de lacs arctiques auraient permis d&rsquo;apporter ces icebergs aussi loin dans la zone tropicale.<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">   <br \/><\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">Bien s\u00fbr qu\u2019il faisait froid pendant la derni\u00e8re glaciation, mais jusqu\u2019o\u00f9 s\u2019\u00e9tendait l\u2019emprise de la glace? Visiblement pas grand monde devait \u00eatre \u00e9pargn\u00e9 puisque des chercheurs de Caroline du Sud ont retrouv\u00e9 des traces d\u2019icebergs\u2026 \u00e0 Miami! Ces monstres flottants ont racl\u00e9 les fonds marins et laiss\u00e9 de v\u00e9ritables tranch\u00e9es au large de la Floride. La nouvelle a \u00e9t\u00e9 annonc\u00e9e jeudi 6 d\u00e9cembre au congr\u00e8s annuel de l\u2019union am\u00e9ricaine de g\u00e9ophysique.<\/span><\/span><\/p>\n<p> <script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script> <!-- TDF2 --> <ins class=\"adsbygoogle\"      style=\"display:inline-block;width:336px;height:280px\"      data-ad-client=\"ca-pub-2860849627502538\"      data-ad-slot=\"1340140919\"><\/ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); <\/script> <\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">Les chercheurs ont pris en compte le niveau de la mer d\u2019il y a 20 000 ans pour estimer que ces icebergs devaient mesurer entre 100 et 200 m\u00e8tres. Pour l\u2019instant une centaine de marques ont \u00e9t\u00e9 d\u00e9couvertes dans le nord de la Floride et quatre au sud. Celles-ci font entre 10 et 50 m\u00e8tres de large pour un maximum de 5 m\u00e8tres de profondeur. Elles ont \u00e9t\u00e9 d\u00e9couvertes gr\u00e2ce \u00e0 des sonars apr\u00e8s la d\u00e9couverte en 2006 de cas similaires, mais plus nombreux, sur la c\u00f4te de la Caroline du Sud.<\/span><\/span><\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">Des crues d\u2019eau douce responsables<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">Il semblerait que des d\u00e9bordements gigantesques dans les lacs glaciaires de l\u2019Arctique aient provoqu\u00e9 la descente de courants froids jusqu\u2019aux c\u00f4tes atlantiques de la Floride. Des grands apports en eau douce dans les oc\u00e9ans de l\u2019\u00e2ge glaciaire ont en effet \u00e9t\u00e9 constat\u00e9s \u00e0 plusieurs reprises.<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">Cela aurait repr\u00e9sent\u00e9 une quantit\u00e9 d\u2019eau non sal\u00e9e sup\u00e9rieure \u00e0 celle contenue dans les grands lacs am\u00e9ricains. Selon les chercheurs, l\u2019apparition d\u2019un tel courant d\u2019eau froide a certainement perturb\u00e9 et d\u00e9vi\u00e9 le Gulf Stream de l\u2019\u00e9poque, ce qui a d\u00fb modifier profond\u00e9ment le climat en Am\u00e9rique du Nord et jusqu\u2019en Europe.<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">\u00ab\u00a0Plus nous pourrons faire de cartographie, mieux nous connaitrons le plancher oc\u00e9anique, explique Jenna Hill, professeur \u00e0 l\u2019universit\u00e9 c\u00f4ti\u00e8re de Caroline du Sud. Nous ne pensions \u00e0 la base pas trouver des traces de raclement d\u2019iceberg. Cela ouvre la porte \u00e0 de nombreuses autres informations \u00e0 propos des mod\u00e8les du climat et de la circulation des oc\u00e9ans du pass\u00e9.\u00a0\u00bb Son \u00e9quipe cherchait \u00e0 la base des traces d\u2019\u00e9ruptions sous-marines de gaz quand elle a trouv\u00e9 ces intrigantes balafres sur les fonds marins.<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">source :\u00a0http:\/\/www.maxisciences.com<\/span><\/span><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"1175\">(309)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\"><img decoding=\"async\" class=\" alignleft size-full wp-image-348\" src=\"http:\/\/www.laterredufutur.com\/wordpress\/wp-content\/uploads\/2011\/06\/banquise.jpg\" border=\"0\" alt=\"banquise\" width=\"120\" style=\"float: left;\" \/>Il y a 20 000 ans il faisait si froid que les icebergs descendaient de l&rsquo;Arctique jusqu&rsquo;au niveau de Miami. Les chercheurs ont fait cette d\u00e9couverte gr\u00e2ce aux marques que les antiques gla\u00e7ons ont laiss\u00e9 sur les fonds marins floridiens. D&rsquo;immenses inondations d&rsquo;eau douce en provenance de lacs arctiques auraient permis d&rsquo;apporter ces icebergs aussi loin dans la zone tropicale.<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\"> <\/p>\n","protected":false},"author":1,"featured_media":348,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[20],"tags":[1497,298,242,156,333,393,267,157,396,1495,1496,1498],"class_list":["post-1175","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climat","tag-20000-ans","tag-arctique","tag-atlantique","tag-banquise","tag-eau","tag-fonte","tag-glace","tag-glaciers","tag-gulf-stream","tag-iceberg","tag-miami","tag-salee","wpcat-20-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/06\/banquise.jpg?fit=450%2C298&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-iX","jetpack-related-posts":[{"id":4729,"url":"https:\/\/www.laterredufutur.com\/accueil\/antarctique-icebergs-et-rechauffement-climatique-coup-de-froid\/","url_meta":{"origin":1175,"position":0},"title":"Antarctique : Icebergs et r\u00e9chauffement climatique : coup de froid","author":"Admin","date":"14 janvier 2009","format":false,"excerpt":"Dans le th\u00e8me de l'Antarctique qui se refroidit, voici un nouvel article tr\u00e8s objectif: Icebergs et r\u00e9chauffement climatique : un coup de froid sur les id\u00e9es re\u00e7ues : Autour de l\u2019antarctique, les icebergs seraient de plus en plus nombreux et remonteraient de plus en plus au nord ? Le tout\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/Antarctica1.jpeg?fit=540%2C450&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/Antarctica1.jpeg?fit=540%2C450&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/Antarctica1.jpeg?fit=540%2C450&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":3826,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-grande-debacle-glaciaire\/","url_meta":{"origin":1175,"position":1},"title":"La Grande D\u00e9bacle Glaciaire","author":"Admin","date":"23 janvier 2007","format":false,"excerpt":"Ce n'est un paradoxe qu'en apparence. Que 2007 cumule les titres de l'ann\u00e9e la plus chaude de puis cent cinquante ans et d'Ann\u00e9e polaire internationale n'a rien d'\u00e9tonnant pour les sp\u00e9cialistes. Il s'agit encore et toujours de climat, et en cette mati\u00e8re froid et chaud sont intimement li\u00e9s. De mars\u2026","rel":"","context":"Dans &quot;Courants Marins&quot;","block_context":{"text":"Courants Marins","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/circulation-oceanique\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/plaque.jpg?fit=468%2C324&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2573,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-groenland-se-refroidit\/","url_meta":{"origin":1175,"position":2},"title":"Le Groenland se refroidit","author":"Admin","date":"12 d\u00e9cembre 2004","format":false,"excerpt":"Pendant que l'on parle de r\u00e9chauffement global, que l'on parle de la fonte du permafrost autour du cercle polaire, que l'on parle de la fonte de la banquise dans l'artique, le Groenland montre des signes de refroidissement. Que se passe t-il ? Que se cache t-il derri\u00e8re ces faits ?\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/groenland.jpeg?fit=450%2C332&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2968,"url":"https:\/\/www.laterredufutur.com\/accueil\/du-givre-a-gogo\/","url_meta":{"origin":1175,"position":3},"title":"Du Givre \u00e0 Gogo","author":"Admin","date":"8 juillet 2005","format":false,"excerpt":"Nous avons vu il y a quelques temps que de forts contrastes de temp\u00e9ratures existaient. L'exemple 1er est celui de l'Antarctique qui depuis 25 ans se refroidit. Depuis 1992, la calotte polaire de l'Est Antarctique s'est \u00e9paissie de 45 milliards de tonnes d'eau, soit une quantit\u00e9 \u00e9quivalente \u00e0 la fonte\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/givres-froid.jpg?fit=369%2C249&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2759,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-courant-du-labrador\/","url_meta":{"origin":1175,"position":4},"title":"Le Courant du Labrador","author":"Admin","date":"26 mars 2005","format":false,"excerpt":"Le courant du Labrador est moins populaire que le Gulf Stream et pourtant qui est il ? Quelle est son influence ?\u00a0 Son action est tr\u00e8s grande sur le climat, certains partent \u00e0 la conqu\u00eate de ce courant mal connu... \u00a0 Les icebergs restent de glace face au r\u00e9chauffement climatique.\u2026","rel":"","context":"Dans &quot;Courants Marins&quot;","block_context":{"text":"Courants Marins","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/circulation-oceanique\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/spaw\/images\/tmap.gif?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":5012,"url":"https:\/\/www.laterredufutur.com\/accueil\/vers-un-refroidissement-de-leurope\/","url_meta":{"origin":1175,"position":5},"title":"Vers un refroidissement de l&rsquo;europe ?","author":"Admin","date":"2 septembre 2009","format":false,"excerpt":"Les eaux profondes oc\u00e9aniques suivent un circuit bien identifi\u00e9 autour de la plan\u00e8te \u00d1 parcouru en pr\u00e8s de deux mille ans. L'analyse isotopique d'organismes marins fossiles a montr\u00e9 que la vitesse de ce flux avait vari\u00e9 dans le pass\u00e9, et qu'un ralentissement se traduisait par le refroidissement des r\u00e9gions auxquelles\u2026","rel":"","context":"Dans &quot;Courants Marins&quot;","block_context":{"text":"Courants Marins","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/circulation-oceanique\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/courant2.jpg?fit=500%2C372&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/1175","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=1175"}],"version-history":[{"count":0,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/1175\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/348"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=1175"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=1175"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=1175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}