{"id":4407,"date":"2008-05-02T20:19:42","date_gmt":"2008-05-02T18:19:42","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil1\/?p=4407"},"modified":"2015-04-12T20:21:05","modified_gmt":"2015-04-12T18:21:05","slug":"et-si-le-gulf-stream-sarretait","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/et-si-le-gulf-stream-sarretait\/","title":{"rendered":"Et si le Gulf Stream s\u2019arr\u00eatait ?"},"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 align=\"justify\"><span style=\"font-size: small;\">Le Gulf Stream, v\u00e9ritable fleuve marin apporte la vie et la chaleur. Il pourrait bient\u00f4t avoir quelques probl\u00e8mes li\u00e9s au r\u00e9chauffement climatique.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Bien avant les conquistadores, les s\u00e9minoles connaissaient l\u2019existence de ce courant. Bien plus tard, l\u2019infatigable Benjamin Franklin en fit une carte d\u00e9taill\u00e9e.<br \/>\nLe Gulf Stream est un v\u00e9ritable fleuve, large de 80 \u00e0 150 km, profond d\u2019un kilom\u00e8tre environ et coule \u00e0 la vitesse de 9 kilom\u00e8tres \u00e0 l\u2019heure.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Plusieurs th\u00e9ories ont \u00e9t\u00e9 avanc\u00e9es pour expliquer son perp\u00e9tuel mouvement allant de la Floride au P\u00f4le :<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Or le r\u00e9chauffement climatique provoque la fonte de la banquise, et l\u2019\u00e9coulement de millions de m\u00e8tres cubes d\u2019eau douce dans l\u2019eau sal\u00e9e, modifiant ainsi la vitesse de circulation du Gulf Stream.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Mais il y a plus grave. Le taux de CO2 dans l\u2019atmosph\u00e8re varie avec les temp\u00e9ratures. On a constat\u00e9 ainsi qu\u2019il avait doubl\u00e9 en un million d\u2019ann\u00e9es, et qu\u2019il devrait encore doubler en un si\u00e8cle pour atteindre 700 ppmv en 2050.<br \/>\nLa production de m\u00e9thane augmente exponentiellement, elle est li\u00e9e \u00e0 l\u2019activit\u00e9 humaine, et provoque le r\u00e9chauffement plan\u00e9taire et la lib\u00e9ration des millions de m\u00e8tres cube de m\u00e9thane pi\u00e9g\u00e9s dans le permafrost.<br \/>\nIl est a craindre que les \u00ab mod\u00e8les \u00bb imagin\u00e9s soient encore loin de la r\u00e9alit\u00e9 qui nous attend.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">D\u2019apr\u00e8s Richard Seager, climatologue de l\u2019Universit\u00e9 de Columbia, le Gulf Stream pourrait s\u2019arr\u00eater d\u2019ici 20 ou 200 ans, selon les mod\u00e8les.<\/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 align=\"justify\"><span style=\"font-size: small;\">Il est connu que la temp\u00e9rature a augment\u00e9 de 0,6% en un si\u00e8cle, et qu\u2019elle est en train de monter en puissance, or le r\u00e9chauffement de l\u2019eau provoque la mont\u00e9e du niveau des oc\u00e9ans. Ceci s\u2019ajoute \u00e0 la fonte des glaciers continentaux, et des glaciers de l\u2019arctique. Ces glaciers, lib\u00e9rant d\u2019\u00e9normes quantit\u00e9 d\u2019eau, douce refroidissent les courants. L\u2019effet de serre contribue aussi \u00e0 l\u2019augmentation de la pluviom\u00e9trie de l\u2019Atlantique Nord.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Tous ces ph\u00e9nom\u00e8nes conjugu\u00e9s pourraient provoquer l\u2019arr\u00eat pur et simple du Gulf Stream, puisqu\u2019un important apport d\u2019eau douce diminuerait d\u2019autant la densit\u00e9 de l\u2019eau entre l\u2019oc\u00e9an arctique et la mer de Norv\u00e8ge.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Au mieux, le Gulf Stream ne d\u00e9passerait pas le niveau des A\u00e7ores.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Le dernier refroidissement remonte \u00e0 8200 ans et il serait du, d\u2019apr\u00e8s l\u2019\u00e9tude s\u00e9dimentaire, \u00e0 un apport massif d\u2019eau douce dans l\u2019Atlantique Nord lequel aurait interrompu, ou ralenti la circulation des courants marins.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Or si le Gulf Stream ralentit, la mer absorbera moins de CO2, et cela augmentera la production de gaz a effet de serre, provoquant l\u2019acc\u00e9l\u00e9ration de la fonte des glaciers, et un apport suppl\u00e9mentaire d\u2019eau douce dans les eaux sal\u00e9es des oc\u00e9ans.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">C\u2019est le syndrome du serpent qui se mord la queue.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Alors pendant que les nations h\u00e9sitent \u00e0 prendre toutes les mesures qui s\u2019imposent, le r\u00e9chauffement climatique prend de l\u2019ampleur. Il y a l\u00e0 de quoi mal augurer de l\u2019avenir.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Car comme disait un vieil ami africain :<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">\u00ab Si vous nagez dans le bonheur, soyez prudent, restez l\u00e0 ou vous avez pied \u00bb.<br \/>\n<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">source : <a href=\"http:\/\/www.naturavox.fr\/\">http:\/\/www.naturavox.fr\/<\/a><\/span><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"4407\">(468)<\/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>Le Gulf Stream, v\u00e9ritable fleuve marin apporte la vie et la chaleur. Il pourrait bient\u00f4t avoir quelques probl\u00e8mes li\u00e9s au&#8230;<\/p>\n","protected":false},"author":1,"featured_media":4408,"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":[23],"tags":[395,3044,3393,3392,396,1725,3391],"class_list":["post-4407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-circulation-oceanique","tag-atlantique-nord","tag-courant-marins","tag-eaux-douces","tag-eaux-salees","tag-gulf-stream","tag-hypothese","tag-mer-norvege","wpcat-23-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/gulfstream05051.jpg?fit=350%2C264&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-195","jetpack-related-posts":[{"id":4899,"url":"https:\/\/www.laterredufutur.com\/accueil\/pour-le-climat-nous-sommes-tributaires-du-gulf-stream\/","url_meta":{"origin":4407,"position":0},"title":"Pour le climat, nous sommes tributaires du Gulf Stream","author":"Admin","date":"29 mai 2009","format":false,"excerpt":"Les grands courants marins parcourent les mers du globe comme des tapis roulants, ils \u00e9voluent en surface dans les mers chaudes, plongent lorsqu\u2019ils se heurtent aux mers froides et jouent un r\u00f4le majeur dans la r\u00e9gulation des temp\u00e9ratures hivernales, en faisant b\u00e9n\u00e9ficier certaines zones d\u2019un climat maritime, plus doux que\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\/gulf_stream.gif?fit=416%2C350&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2723,"url":"https:\/\/www.laterredufutur.com\/accueil\/lavertissement-de-hubert-reeves\/","url_meta":{"origin":4407,"position":1},"title":"L&rsquo;avertissement de Hubert Reeves","author":"Admin","date":"2 mars 2005","format":false,"excerpt":"Menaces sur le Gulf Stream \u00c9mission du 12 juin 2004 Le Gulf Stream est un courant marin de l'Atlantique-Nord. Il entra\u00eene les eaux ti\u00e8des de la mer des Antilles vers les c\u00f4tes de l'ouest africain. De l\u00e0, il remonte le long de l'Europe (Portugal, France, Angleterre, \u00c9cosse) et revient ensuite\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5762,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-poche-deau-douce-menace-le-gs\/","url_meta":{"origin":4407,"position":2},"title":"Une poche d&rsquo;eau douce menace le GS","author":"Admin","date":"11 avril 2011","format":false,"excerpt":"Une gigantesque poche d'eau douce dans l'oc\u00e9an Arctique pourrait gagner l'Atlantique et potentiellement affecter le Gulf Stream, courant oc\u00e9anique qui contribue de mani\u00e8re substantielle au climat temp\u00e9r\u00e9 de l'Europe de l'Ouest, ont d\u00e9clar\u00e9 mardi des oc\u00e9anographes \u00e0 l'Associated Press. Cette accumulation inhabituelle s'explique par une hausse des volumes d'eau rejet\u00e9s\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\/gulfstream.jpg?fit=250%2C215&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2670,"url":"https:\/\/www.laterredufutur.com\/accueil\/limportance-de-la-banquise\/","url_meta":{"origin":4407,"position":3},"title":"L&rsquo;importance de la Banquise","author":"Admin","date":"28 janvier 2005","format":false,"excerpt":"L'Europe poss\u00e8de un climat agr\u00e9able jusqu'\u00e0 des latitudes proche du cercle polaire. Ainsi on peut observer des vaches en Norv\u00e8ge. On peut voir des hivers en Grande Bretagne et en France qui ne ressemblent en aucun point \u00e0 ceux du Canada et de New York. Mais au del\u00e0 du Gulf\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\/polenord.jpg?fit=300%2C206&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":1850,"url":"https:\/\/www.laterredufutur.com\/accueil\/ralentissement-du-gulf-stream-ou-en-sommes-nous\/","url_meta":{"origin":4407,"position":4},"title":"Ralentissement du Gulf Stream : o\u00f9 en sommes nous ?","author":"Admin","date":"6 mars 2014","format":false,"excerpt":"Entretien avec le climatologue italien Vincenzo Ferrara \"Les mauvaises nouvelles viendraient de la confirmation que le Gulf Stream ralentit\". Cela signifie qu'il augmenterait le risque d'une nouvelle petite \u00e9poque glaciaire, c'est \u00e0 dire un changement soudain du climat qui a amen\u00e9 un petit age glaciaire, le pire \u00e9tant le Dryas\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":"","width":0,"height":0},"classes":[]},{"id":5905,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-fonte-de-linlandsis-groenlandais-est-rapide-et-ralentit-le-gulf-stream\/","url_meta":{"origin":4407,"position":5},"title":"La fonte de l&rsquo;inlandsis groenlandais est rapide et ralentit le Gulf Stream","author":"Admin","date":"20 avril 2015","format":false,"excerpt":"Selon la National Oceanic and Atmospheric Administration (NOAA), l'hiver 2014-15 dans l'H\u00e9misph\u00e8re Nord reste l'un des plus chauds \u00e0 l'\u00e9chelle mondiale. Mais si vous regardez de pr\u00e8s les cartes de la temp\u00e9rature mondiale, il devient clair qu'une zone de l'Atlantique Nord r\u00e9siste manifestement \u00e0 la tendance. Cette r\u00e9gion \u00e9tait, en\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\/groenland2.jpg?fit=544%2C352&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/groenland2.jpg?fit=544%2C352&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/groenland2.jpg?fit=544%2C352&ssl=1&resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4407","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=4407"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4407\/revisions"}],"predecessor-version":[{"id":4409,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4407\/revisions\/4409"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/4408"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=4407"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=4407"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=4407"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}