{"id":19729,"date":"2019-10-23T17:00:27","date_gmt":"2019-10-23T15:00:27","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=19729"},"modified":"2019-09-30T11:32:59","modified_gmt":"2019-09-30T09:32:59","slug":"et-si-locean-indien-compensait-la-faiblesse-du-gulf-stream","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/et-si-locean-indien-compensait-la-faiblesse-du-gulf-stream\/","title":{"rendered":"Et si l&rsquo;oc\u00e9an indien compensait la faiblesse du Gulf Stream ?"},"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>Depuis plusieurs d\u00e9cennies, les scientifiques s\u2019attendent \u00e0 ce que la fonte des glaces de l\u2019Arctique perturbe significativement la circulation oc\u00e9anique dans le nord-atlantique. Un ph\u00e9nom\u00e8ne qui commencerait \u00e0 \u00eatre visible et qui devrait s\u2019accentuer \u00e0 l\u2019avenir avec la poursuite du r\u00e9chauffement global. \u00c0 moins que l\u2019oc\u00e9an Indien n\u2019en d\u00e9cide autrement\u2026<\/p>\n<p>Le syst\u00e8me de courants marins dans le bassin atlantique \u2013 appel\u00e9 AMOC en anglais \u2013 est en partie pilot\u00e9 par la densit\u00e9 des eaux. Si elles deviennent assez denses, elles plongent vers les profondeurs en cr\u00e9ant un appel de masse depuis le sud. C\u2019est ainsi qu\u2019est maintenue l\u2019extension vers le nord du Gulf Stream. On parle plus pr\u00e9cis\u00e9ment de d\u00e9rive nord-atlantique.<\/p>\n<p>Actuellement, la plong\u00e9e se produit pr\u00e8s des mers entourant le Groenland et le Svalbard, l\u00e0 o\u00f9 l\u2019oc\u00e9an est suffisamment froid et sal\u00e9. Or, avec le changement climatique, l\u2019oc\u00e9an se r\u00e9chauffe et \u2013 surtout \u2013 la glace fond en lib\u00e9rant de l\u2019eau douce. De ce fait, la couche oc\u00e9anique sup\u00e9rieure tend \u00e0 devenir moins dense dans cette zone critique. On s\u2019attend ainsi \u00e0 ce que la plong\u00e9e oc\u00e9anique soit de plus en plus difficile et que la circulation oc\u00e9anique ralentisse.<\/p>\n<p>Si ce ralentissement devient suffisamment important, il aura des cons\u00e9quences certaines pour le climat des continents adjacents \u2013 dont l\u2019Europe.<\/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>Cependant, une nouvelle \u00e9tude avance qu\u2019une force de compensation plut\u00f4t inattendue pourrait intervenir. Publi\u00e9 dans la revue Nature Climate Change, le papier explique que le r\u00e9chauffement acc\u00e9l\u00e9r\u00e9 de l\u2019oc\u00e9an Indien serait en mesure de contrebalancer l\u2019affaiblissement de l\u2019AMOC. Pour arriver \u00e0 ces conclusions, les auteurs ont coupl\u00e9 observations et mod\u00e8le climatique de haute r\u00e9solution.<\/p>\n<p>Le m\u00e9canisme de r\u00e9troaction identifi\u00e9 par les chercheurs est le suivant. Comme la temp\u00e9rature de l\u2019oc\u00e9an Indien augmente vite par rapport aux autres oc\u00e9ans, les pr\u00e9cipitations s\u2019y intensifient fortement. Ce faisant, l\u2019air \u00e0 grande \u00e9chelle circule plus rapidement pour alimenter les ascendances pluvio-orageuses.<\/p>\n<p>Au niveau de l\u2019Atlantique tropical, cela se traduit par une baisse des pluies et, en cons\u00e9quence, par des eaux de surface plus sal\u00e9es. Par ailleurs, les vents d\u2019ouest se renforcent dans le nord du bassin ce qui refroidit plus efficacement la surface oc\u00e9anique.<\/p>\n<p>R\u00e9sultat : il devient plus facile pour les masses d\u2019eau circulant vers le nord de se densifier et, ce faisant, de maintenir l\u2019AMOC. Ce processus m\u00e9connu et r\u00e9v\u00e9l\u00e9 par les simulations num\u00e9riques pourrait m\u00eame d\u00e9j\u00e0 \u00eatre \u00e0 l\u2019\u0153uvre, indique l\u2019\u00e9tude. Toutefois, ceci serait transitoire&#8230;<\/p>\n<p>extrait et source : <a href=\"https:\/\/sciencepost.fr\/ralentissement-du-gulf-stream-locean-indien-a-la-rescousse\/\" rel=\"noopener noreferrer\" target=\"_blank\">https:\/\/sciencepost.fr\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"19729\">(639)<\/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>Depuis plusieurs d\u00e9cennies, les scientifiques s\u2019attendent \u00e0 ce que la fonte des glaces de l\u2019Arctique perturbe significativement la circulation oc\u00e9anique&#8230;<\/p>\n","protected":false},"author":1,"featured_media":5907,"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_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":"Et si l'oc\u00e9an indien compensait la faiblesse du Gulf Stream ? @laterredufutur.com Terra  Projects","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[23],"tags":[4865,41,188,396,1380],"class_list":["post-19729","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-circulation-oceanique","tag-amoc","tag-climat","tag-europe","tag-gulf-stream","tag-ocean-indien","wpcat-23-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/gulf-stream-avril-2015.jpg?fit=900%2C472&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-58d","jetpack-related-posts":[{"id":27772,"url":"https:\/\/www.laterredufutur.com\/accueil\/comment-un-changement-du-gulf-stream-pourrait-signaler-leffondrement-dun-systeme-de-courant-oceanique-majeur\/","url_meta":{"origin":19729,"position":0},"title":"Comment un changement du Gulf Stream pourrait signaler l&rsquo;effondrement d&rsquo;un syst\u00e8me de courant oc\u00e9anique majeur","author":"Admin","date":"13 mars 2026","format":false,"excerpt":"Les variations du Gulf Stream, un puissant courant oc\u00e9anique de l'Atlantique, pourraient constituer un signal d'alarme pr\u00e9coce annon\u00e7ant l'effondrement imminent de la circulation m\u00e9ridienne de retournement atlantique (AMOC). L'AMOC est un vaste syst\u00e8me de courants oc\u00e9aniques qui agit comme un tapis roulant, transportant la chaleur des tropiques vers l'Atlantique Nord.\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\/2021\/02\/gulfstream.jpg?fit=1200%2C747&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/gulfstream.jpg?fit=1200%2C747&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/gulfstream.jpg?fit=1200%2C747&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/gulfstream.jpg?fit=1200%2C747&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/gulfstream.jpg?fit=1200%2C747&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":23894,"url":"https:\/\/www.laterredufutur.com\/accueil\/dossier-de-nouvelles-donnees-montrent-que-le-gulf-stream-continue-de-ralentir-leau-douce-a-cree-un-desequilibre-et-le-rapproche-dun-point-deffondrement\/","url_meta":{"origin":19729,"position":1},"title":"Dossier : De nouvelles donn\u00e9es montrent que le Gulf Stream continue de ralentir, l&rsquo;eau douce a cr\u00e9\u00e9 un d\u00e9s\u00e9quilibre et le rapproche d&rsquo;un point d&rsquo;effondrement","author":"Admin","date":"6 avril 2022","format":false,"excerpt":"Le Gulf Stream s'est consid\u00e9rablement affaibli au cours des derni\u00e8res d\u00e9cennies, comme le r\u00e9v\u00e8lent les derni\u00e8res donn\u00e9es et de nouvelles \u00e9tudes. Le temps aux \u00c9tats-Unis et en Europe d\u00e9pend fortement de ce courant oc\u00e9anique, il est donc important de comprendre les changements en cours et ce qu'ils signifient pour notre\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\/2022\/04\/hemisphere-nord-ocean-salinite-concentration-amoc-gulf-stream.png?fit=1200%2C862&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/04\/hemisphere-nord-ocean-salinite-concentration-amoc-gulf-stream.png?fit=1200%2C862&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/04\/hemisphere-nord-ocean-salinite-concentration-amoc-gulf-stream.png?fit=1200%2C862&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/04\/hemisphere-nord-ocean-salinite-concentration-amoc-gulf-stream.png?fit=1200%2C862&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/04\/hemisphere-nord-ocean-salinite-concentration-amoc-gulf-stream.png?fit=1200%2C862&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":21986,"url":"https:\/\/www.laterredufutur.com\/accueil\/anomalie-inhabituelle-dans-latlantique-nord\/","url_meta":{"origin":19729,"position":2},"title":"Anomalie inhabituelle dans l&rsquo;Atlantique Nord","author":"Admin","date":"15 f\u00e9vrier 2021","format":false,"excerpt":"Une anomalie oc\u00e9anique inhabituelle est d\u00e9tect\u00e9e dans le Gulf Stream, non observ\u00e9e depuis au moins 150 ans, ce qui rev\u00eat une importance alors que nous affrontons les prochaines saisons m\u00e9t\u00e9orologiques. Les zones des oc\u00e9ans du globe se r\u00e9chauffent et se refroidissent constamment. Mais r\u00e9cemment, une anomalie inhabituellement forte s'est d\u00e9velopp\u00e9e\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\/2021\/02\/gulfstream.jpg?fit=1200%2C747&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/gulfstream.jpg?fit=1200%2C747&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/gulfstream.jpg?fit=1200%2C747&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/gulfstream.jpg?fit=1200%2C747&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/02\/gulfstream.jpg?fit=1200%2C747&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":22094,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-gulf-stream-continue-son-ralentissement\/","url_meta":{"origin":19729,"position":3},"title":"Le Gulf Stream continue son ralentissement","author":"Admin","date":"2 mars 2021","format":false,"excerpt":"Selon une \u00e9tude parue dans la revue Nature G\u00e9oscience fin f\u00e9vrier, le courant oc\u00e9anique est sujet \u00e0 un ralentissement in\u00e9dit depuis un mill\u00e9naire. Et on devrait plut\u00f4t s\u2019en inqui\u00e9ter\u2026 Alarmant : c\u2019est le mot ad\u00e9quat, pour r\u00e9sumer et qualifier l\u2019\u00e9tude men\u00e9e par le Groupe d\u2019experts intergouvernemental sur l\u2019\u00e9volution du climat\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\/2019\/10\/gulf-stream.jpg?fit=930%2C558&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/10\/gulf-stream.jpg?fit=930%2C558&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/10\/gulf-stream.jpg?fit=930%2C558&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/10\/gulf-stream.jpg?fit=930%2C558&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":17775,"url":"https:\/\/www.laterredufutur.com\/accueil\/dans-latlantique-nord-lequilibre-de-la-circulation-oceanique-atlantique-amoc-est-altere\/","url_meta":{"origin":19729,"position":4},"title":"Dans l\u2019Atlantique Nord, l\u2019\u00e9quilibre de la circulation oc\u00e9anique Atlantique (Amoc) est alt\u00e9r\u00e9","author":"Admin","date":"15 janvier 2019","format":false,"excerpt":"Approcherait-on du sc\u00e9nario catastrophe du film le Jour d\u2019apr\u00e8s, sorti en 2004 ? La modification des courants marins qui influencent la m\u00e9t\u00e9o en Europe comme en Am\u00e9rique du Nord est un effet redout\u00e9 du bouleversement climatique en cours. Un point de bascule majeur, c\u2019est-\u00e0-dire l\u2019un de ces changements abrupts et\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\/2019\/01\/atlantique-nord-ocean.jpg?fit=1057%2C694&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/atlantique-nord-ocean.jpg?fit=1057%2C694&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/atlantique-nord-ocean.jpg?fit=1057%2C694&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/atlantique-nord-ocean.jpg?fit=1057%2C694&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/atlantique-nord-ocean.jpg?fit=1057%2C694&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":18659,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-circulation-de-locean-atlantique-au-point-le-plus-faible-depuis-plus-de-1500-ans\/","url_meta":{"origin":19729,"position":5},"title":"La circulation de l&rsquo;oc\u00e9an Atlantique au point le plus faible depuis plus de 1500 ans","author":"Admin","date":"18 avril 2019","format":false,"excerpt":"Une nouvelle \u00e9tude men\u00e9e par l'University College London (UCL) et la Woods Hole Oceanographic Institution (WHOI) prouve qu'un des rouages \u200b\u200bessentiels du syst\u00e8me de la circulation oc\u00e9anique mondiale n'a pas atteint sa puissance maximale depuis le milieu des ann\u00e9es 1800 et qu'il est actuellement \u00e0 son point le plus faible\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\/2019\/03\/atlanticocea.jpg?fit=800%2C480&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/atlanticocea.jpg?fit=800%2C480&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/atlanticocea.jpg?fit=800%2C480&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/03\/atlanticocea.jpg?fit=800%2C480&ssl=1&resize=700%2C400 2x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/19729","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=19729"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/19729\/revisions"}],"predecessor-version":[{"id":19730,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/19729\/revisions\/19730"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/5907"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=19729"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=19729"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=19729"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}