{"id":26242,"date":"2024-09-22T12:00:41","date_gmt":"2024-09-22T10:00:41","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=26242"},"modified":"2024-09-16T08:57:41","modified_gmt":"2024-09-16T06:57:41","slug":"le-jet-stream-glisse-de-plus-en-plus-vers-le-pole-nord","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/le-jet-stream-glisse-de-plus-en-plus-vers-le-pole-nord\/","title":{"rendered":"Le jet-stream glisse de plus en plus vers le p\u00f4le Nord"},"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>L\u2019hypoth\u00e8se selon laquelle le jet stream, ou courant-jet, se serait rapproch\u00e9 des p\u00f4les de notre plan\u00e8te au cours des derni\u00e8res d\u00e9cennies, se renforce. Ce \u00ab d\u00e9placement \u00bb accro\u00eetra in\u00e9vitablement les canicules et les s\u00e9cheresses dans les r\u00e9gions qui d\u00e9pendent de ces vents en haute altitude pour diriger \u2014ou non\u2014 les pr\u00e9cipitations dans leur direction.<\/p>\n<p>On appelle courant-jet, ou courant d\u2019air en haute altitude, des ph\u00e9nom\u00e8nes atmosph\u00e9riques qui prennent la forme de rubans sinueux. Circulant d\u2019ouest en est, les courants-jets polaires agissent comme une barri\u00e8re entre les masses d\u2019air des zones froides et celles des r\u00e9gions temp\u00e9r\u00e9es. Ils sont plus forts en hiver, lorsque les \u00e9carts de temp\u00e9rature entre leurs deux flancs sont plus grands.<\/p>\n<p>Lorsque le courant-jet polaire de l\u2019h\u00e9misph\u00e8re nord glisse anormalement vers le sud, on assiste, dans des r\u00e9gions qui n\u2019en ont pas l\u2019habitude, \u00e0 des temp\u00e9ratures anormalement froides en hiver \u2014c\u2019est ce qu\u2019on s\u2019est mis \u00e0 appeler ces derni\u00e8res ann\u00e9es le vortex polaire. S\u2019il devait se confirmer que ce courant-jet est en train, \u00e0 l\u2019\u00e9chelle des d\u00e9cennies, de glisser progressivement vers le nord, cela pourrait entra\u00eener un nombre croissant de temp\u00e9ratures anormalement chaudes, y compris assez loin au nord.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"26230\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/jet-stream-septembre-2024\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/09\/jet-stream-septembre-2024.webp?fit=620%2C413&amp;ssl=1\" data-orig-size=\"620,413\" 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=\"jet stream septembre 2024\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/09\/jet-stream-septembre-2024.webp?fit=620%2C413&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/09\/jet-stream-septembre-2024.webp?resize=620%2C413&#038;ssl=1\" alt=\"\" width=\"620\" height=\"413\" class=\"alignnone size-full wp-image-26230\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/09\/jet-stream-septembre-2024.webp?w=620&amp;ssl=1 620w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/09\/jet-stream-septembre-2024.webp?resize=300%2C200&amp;ssl=1 300w\" sizes=\"auto, (max-width: 620px) 100vw, 620px\" \/><\/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>Cela fait au moins 10 ans que des experts \u00e9mettent l\u2019hypoth\u00e8se que le d\u00e9placement ou l&rsquo;affaiblissement des courants-jets serait une cause du r\u00e9chauffement climatique \u2014et aurait un effet amplificateur dans les r\u00e9gions touch\u00e9es. Mais leur forme sinueuse, leurs variations saisonni\u00e8res et le fait que les satellites ne les observent que depuis quelques d\u00e9cennies, rendent difficile les pr\u00e9dictions.<\/p>\n<p>Dans une recherche parue en ao\u00fbt dans la revue Geophysical Research Letters, quatre chercheurs du Coll\u00e8ge universitaire de Londres affirment qu\u2019on commence \u00e0 voir se d\u00e9gager des tendances. Ils estiment que, depuis 1980, au-dessus de l\u2019oc\u00e9an Pacifique, le courant-jet polaire de l\u2019h\u00e9misph\u00e8re nord s\u2019est d\u00e9plac\u00e9, l\u2019hiver, de 30 \u00e0 80 km par d\u00e9cennie.<\/p>\n<p>Dans une \u00e9tude parue en avril dernier, une autre \u00e9quipe avait \u00e9galement conclu \u00e0 une tendance nette, mais sans se risquer \u00e0 la quantifier.<\/p>\n<p>Cela peut se traduire par des temp\u00e9ratures tropicales qui remontent vers le nord au fur et \u00e0 mesure que le courant-jet remonte lui aussi vers le nord, augmentant progressivement dans ces r\u00e9gions la moyenne annuelle des canicules et des temp\u00eates.<\/p>\n<p>Source : <a href=\"https:\/\/www.sciencepresse.qc.ca\/actualite\/2024\/09\/12\/jet-stream-glisse-vers-pole-nord\" rel=\"noopener\" target=\"_blank\">https:\/\/www.sciencepresse.qc.ca\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"26242\">(494)<\/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>L\u2019hypoth\u00e8se selon laquelle le jet stream, ou courant-jet, se serait rapproch\u00e9 des p\u00f4les de notre plan\u00e8te au cours des derni\u00e8res&#8230;<\/p>\n","protected":false},"author":1,"featured_media":26244,"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":"","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},"jetpack_post_was_ever_published":false},"categories":[32],"tags":[4406,1204,55,262],"class_list":["post-26242","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteorologie","tag-deplacement","tag-jet-stream","tag-meteo","tag-pole-nord","wpcat-32-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/09\/jet-stream.jpg?fit=1024%2C1024&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-6Pg","jetpack-related-posts":[{"id":3187,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-jet-stream-polaire-mis-a-lepreuve\/","url_meta":{"origin":26242,"position":0},"title":"Le jet stream polaire mis \u00e0 l&rsquo;\u00e9preuve","author":"Admin","date":"21 d\u00e9cembre 2005","format":false,"excerpt":"Courant a\u00e9rien d'une force peu commune, ceinturant le globe terrestre sous la forme de deux anneaux situ\u00e9s au-dessus des h\u00e9misph\u00e8res nord et sud \u00e0 environ 10\u00a0000 m\u00e8tres d'altitude. La vitesse du vent, dans le Jet Stream, d\u00e9passe les 300 km\/h et r\u00e9sulte du contraste thermique existant \u00e0 cette altitude entre\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\/jetstream_canada.jpeg?fit=400%2C300&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2489,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-jet-stream-perd-le-nord\/","url_meta":{"origin":26242,"position":1},"title":"Le Jet-stream perd le nord","author":"Admin","date":"1 mars 2015","format":false,"excerpt":"Le d\u00e9r\u00e8glement du jet-stream, vent d'altitude pr\u00e9pond\u00e9rant sur la climatologie, pourrait bien avoir d\u00e9but\u00e9 sous l'effet de la fonte acc\u00e9l\u00e9r\u00e9e de l'Arctique selon les m\u00e9dias, mais la v\u00e9rit\u00e9 pourrait \u00eatre ailleurs. La question se pose, car les vents d'altitude sont anormalement d\u00e9cha\u00een\u00e9s et perturbent jusqu'\u00e0 la dur\u00e9e des vols transatlantiques.","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\/03\/laterredufutur.com_photos_ao-nov2014-mars2015.jpg?fit=600%2C254&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/03\/laterredufutur.com_photos_ao-nov2014-mars2015.jpg?fit=600%2C254&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/03\/laterredufutur.com_photos_ao-nov2014-mars2015.jpg?fit=600%2C254&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":3183,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-stratosphere-lozone-et-le-refroidissement\/","url_meta":{"origin":26242,"position":2},"title":"La stratosph\u00e8re, l&rsquo;ozone et le refroidissement","author":"Admin","date":"19 d\u00e9cembre 2005","format":false,"excerpt":"On pourrait minimiser le probl\u00e8me de l'ozone stratosph\u00e9rique et pourtant ! Nous voil\u00e0 donc confront\u00e9 \u00e0 un probl\u00e8me d\u00e9couvert il y a plus de 20 ans : l'Ozone stratosph\u00e9rique. Mais en cette ann\u00e9e 2005 : le record de temp\u00e9rature la plus basse a \u00e9t\u00e9 observ\u00e9e au sommet de l'ouragan Wilma\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\/courantJet.gif?fit=300%2C295&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":10238,"url":"https:\/\/www.laterredufutur.com\/accueil\/el-nino-rechauffe-le-pole-nord\/","url_meta":{"origin":26242,"position":3},"title":"El Nino r\u00e9chauffe le P\u00f4le nord","author":"Admin","date":"30 d\u00e9cembre 2015","format":false,"excerpt":"Des temp\u00e9ratures qui flirtent avec z\u00e9ro : la douceur plan\u00e9taire de ce d\u00e9but d\u2019hiver n\u2018\u00e9pargne pas le p\u00f4le nord. En cause : El Nino, un ph\u00e9nom\u00e8ne climatique qui perturbe la circulation des courants marins et atmosph\u00e9riques entre les p\u00f4les et l\u2018\u00e9quateur. \u201c L\u2019air chaud remonte vers le nord jusqu\u2019au Spitzberg,\u2026","rel":"","context":"Dans &quot;M\u00e9t\u00e9orologie&quot;","block_context":{"text":"M\u00e9t\u00e9orologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/meteorologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/temperatures-positive-pole-nord-30dec2015.jpg?fit=1200%2C835&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/temperatures-positive-pole-nord-30dec2015.jpg?fit=1200%2C835&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/temperatures-positive-pole-nord-30dec2015.jpg?fit=1200%2C835&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/temperatures-positive-pole-nord-30dec2015.jpg?fit=1200%2C835&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/12\/temperatures-positive-pole-nord-30dec2015.jpg?fit=1200%2C835&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":6777,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-courant-jet-trouve-un-raccourci-au-canada-et-le-refroidit\/","url_meta":{"origin":26242,"position":4},"title":"Le courant jet trouve un raccourci au Canada et le refroidit","author":"Admin","date":"26 mai 2015","format":false,"excerpt":"C'est une situation qui dure depuis des mois au Canada et les m\u00e9t\u00e9orologues parlent beaucoup des niveaux sup\u00e9rieurs de l'atmosph\u00e8re, et vous pouvez vous demandez pourquoi vous devriez vous soucier de ce qui se passe si loin au-dessus de la surface de la Terre.\u00a0Apr\u00e8s tout, nous passons la majorit\u00e9 de\u2026","rel":"","context":"Dans &quot;M\u00e9t\u00e9orologie&quot;","block_context":{"text":"M\u00e9t\u00e9orologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/meteorologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/05\/jet-stream-canada.jpg?fit=480%2C343&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":25052,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-jet-stream-actuel-est-deboussole\/","url_meta":{"origin":26242,"position":5},"title":"Le Jet stream actuel est \u00ab\u00a0d\u00e9boussol\u00e9\u00a0\u00bb","author":"Admin","date":"29 juin 2023","format":false,"excerpt":"Le jet-stream, ou courant-jet, fait le tour de l\u2019h\u00e9misph\u00e8re Nord, tourbillonnant jusqu\u2019\u00e0 15 km au-dessus de nos t\u00eates, comme une couronne pos\u00e9e sur la plan\u00e8te. S\u00e9parant l\u2019air froid de l\u2019Arctique, de l\u2019air plus chaud du Sud, il est l\u2019un des piliers du climat mondial. Pour les climatologues qui l\u2019observent sans\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\/2023\/06\/jet-stream-juin-2023.jpg?fit=1024%2C415&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/06\/jet-stream-juin-2023.jpg?fit=1024%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/06\/jet-stream-juin-2023.jpg?fit=1024%2C415&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/06\/jet-stream-juin-2023.jpg?fit=1024%2C415&ssl=1&resize=700%2C400 2x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/26242","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=26242"}],"version-history":[{"count":2,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/26242\/revisions"}],"predecessor-version":[{"id":26245,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/26242\/revisions\/26245"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/26244"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=26242"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=26242"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=26242"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}