{"id":11736,"date":"2023-05-04T10:54:29","date_gmt":"2023-05-04T08:54:29","guid":{"rendered":"https:\/\/www.culturalusa.com\/news\/?p=11736"},"modified":"2023-05-04T10:54:29","modified_gmt":"2023-05-04T08:54:29","slug":"la-surface-des-oceans-bombe-a-retardement-du-rechauffement-climatique","status":"publish","type":"post","link":"https:\/\/www.culturalusa.com\/news\/actualite\/la-surface-des-oceans-bombe-a-retardement-du-rechauffement-climatique\/","title":{"rendered":"La surface des oc\u00e9ans, \u00ab\u00a0bombe \u00e0 retardement\u00a0\u00bb du r\u00e9chauffement climatique"},"content":{"rendered":"<h2>La surface des mers a battu en avril son record annuel et se maintient depuis \u00e0 des niveaux in\u00e9dits: le ph\u00e9nom\u00e8ne, alarmant mais sans surprise pour les scientifiques, illustre surtout comment les activit\u00e9s humaines ont transform\u00e9 les oc\u00e9ans en \u00ab\u00a0bombe \u00e0 retardement\u00a0\u00bb du r\u00e9chauffement climatique.<\/h2>\n<p>D\u00e9but avril, la temp\u00e9rature moyenne \u00e0 la surface des oc\u00e9ans, \u00e0 l&rsquo;exception des eaux polaires, a atteint 21,1\u00b0C, selon les donn\u00e9es de l&rsquo;observatoire am\u00e9ricain NOAA, battant le pr\u00e9c\u00e9dent record de 21\u00b0C en mars 2016.<\/p>\n<p>Si la moyenne a commenc\u00e9 \u00e0 redescendre un peu fin avril &#8212; cycle naturel \u00e0 la sortie de l&rsquo;hiver austral &#8211;, les temp\u00e9ratures se maintiennent depuis six semaines au-dessus des records de saison.<\/p>\n<p>Dans l&rsquo;imm\u00e9diat, cela \u00ab\u00a0se traduit au niveau r\u00e9gional par une multitude de vagues de chaleur marines\u00a0\u00bb qui \u00ab\u00a0agissent telles des incendies sous-marins, pouvant d\u00e9grader de mani\u00e8re irr\u00e9versible des milliers de kilom\u00e8tre carr\u00e9s de for\u00eats sous-marines, par exemple de laminaire, d&rsquo;herbiers de posidonie, ou de coraux\u00a0\u00bb, d\u00e9crit l&rsquo;oc\u00e9anologue du CNRS Jean-Baptiste Sall\u00e9e.<\/p>\n<p>\u00ab\u00a0Les temp\u00e9ratures les plus spectaculaires se trouvent dans le Pacifique le long de l&rsquo;Am\u00e9rique centrale\u00a0\u00bb, pointe le chercheur, mais l&rsquo;anomalie touche aussi de larges zones dans le nord du Pacifique ainsi que sur les c\u00f4tes atlantiques d&rsquo;Europe du Sud et d&rsquo;Afrique de l\u2019Ouest.<\/p>\n<p>\u00ab\u00a0Il n\u2019est pas surprenant que les oc\u00e9ans se r\u00e9chauffent, on l&rsquo;observe d&rsquo;ann\u00e9e en ann\u00e9e \u00e0 un rythme absolument faramineux\u00a0\u00bb, rappelle toutefois cet auteur du Giec joint par l&rsquo;AFP, car \u00ab\u00a0l&rsquo;oc\u00e9an, tel une \u00e9ponge, absorbe plus de 90% de l&rsquo;augmentation de chaleur caus\u00e9e par les activit\u00e9s humaines\u00a0\u00bb.<\/p>\n<p>Les effet ne se limitent pas \u00e0 la biodiversit\u00e9 marine. \u00ab\u00a0Il y aura une \u00e9vaporation accrue et un fort risque de cyclones plus intenses\u00a0\u00bb, explique \u00e0 l&rsquo;AFP l&rsquo;oc\u00e9anologue Catherine Jeandel, \u00ab\u00a0et peut \u00eatre des cons\u00e9quences sur les courants oc\u00e9aniques\u00a0\u00bb.<\/p>\n<p>Des eaux plus chaudes \u00ab\u00a0fonctionnent comme une barri\u00e8re qui freine les \u00e9changes de gaz\u00a0\u00bb, ajoute la g\u00e9ochimiste: \u00ab\u00a0la pompe \u00e0 oxyg\u00e8ne de l\u2019oc\u00e9an va moins bien fonctionner\u00a0\u00bb et \u00ab\u00a0il en ira de m\u00eame pour la pompe \u00e0 CO2\u00a0\u00bb, r\u00e9duisant l&rsquo;absorption des gaz \u00e0 effet de serre produits par l&rsquo;homme.<\/p>\n<h3>El Ni\u00f1o<\/h3>\n<p>Ce nouveau record ne surprend pas non plus Fr\u00e9d\u00e9ric Hourdin. \u00ab\u00a0Ils sont normaux, dans le cadre d&rsquo;une situation plus que pr\u00e9occupante, anticip\u00e9e depuis longtemps et qui n\u00e9cessite une transformation profonde de nos modes de fonctionnement\u00a0\u00bb. En clair, \u00ab\u00a0on ne prend pas suffisamment conscience que l&rsquo;objectif est de se passer totalement de p\u00e9trole et de charbon\u00a0\u00bb, conclut ce sp\u00e9cialiste des mod\u00e8les climatiques.<\/p>\n<p>Ce record fait-il craindre une sous-\u00e9valuation du r\u00e9chauffement? \u00ab\u00a0Impossible \u00e0 dire sur la base d&rsquo;un record\u00a0\u00bb, relativise le chercheur, compte-tenu de \u00ab\u00a0la part de variabilit\u00e9 naturelle du climat qui fait que \u00e7a peut chauffer davantage pendant quelques mois ou ann\u00e9es\u00a0\u00bb.<\/p>\n<p>En l\u2019occurrence, les oc\u00e9ans du globe ont connu trois ann\u00e9es cons\u00e9cutives de La Ni\u00f1a, ph\u00e9nom\u00e8ne cyclique-climatique qui refroidit les eaux de surface. Or le ph\u00e9nom\u00e8ne inverse, El Ni\u00f1o, semble s&rsquo;installer en 2023 et la transition, avec la fin de l&rsquo;effet refroidissant de La Ni\u00f1a, pourrait s&rsquo;\u00eatre conjugu\u00e9e au r\u00e9chauffement de long terme pour produire ce nouveau record.<\/p>\n<h3>\u00ab\u00a0Irr\u00e9versible, les oc\u00e9ans ayant absorb\u00e9 90% de l&rsquo;exc\u00e8s de chaleur du syst\u00e8me terrestre\u00a0\u00bb<\/h3>\n<p>\u00ab\u00a0Si nous int\u00e9grons la tendance s\u00e9culi\u00e8re d&rsquo;augmentation de la temp\u00e9rature de surface, l&rsquo;ann\u00e9e 2023 ne semble pas trop d\u00e9cal\u00e9e par rapport aux autres ann\u00e9es El Ni\u00f1o\u00a0\u00bb, a relativis\u00e9 le climatologue am\u00e9ricain David Ho sur Twitter, \u00ab\u00a0c&rsquo;est la tendance \u00e0 long terme qui devrait nous alarmer\u00a0\u00bb.<\/p>\n<p>Les oc\u00e9ans ayant absorb\u00e9 90% de l&rsquo;exc\u00e8s de chaleur du syst\u00e8me terrestre provoqu\u00e9 par l&rsquo;activit\u00e9 humaine au cours de l&rsquo;\u00e8re industrielle, les scientifiques estiment qu&rsquo;ils contiennent une \u00e9nergie colossale dans ses profondeurs, 10 zettajoules en 2022 soit 100 fois la production mondiale d&rsquo;\u00e9lectricit\u00e9. \u00ab\u00a0Pendant des ann\u00e9es El Ni\u00f1o, les profondeurs oc\u00e9aniques rel\u00e2chent de la chaleur en surface et r\u00e9chauffent l&rsquo;atmosph\u00e8re\u00a0\u00bb, avertit Jean-Baptise Sall\u00e9e.<\/p>\n<p>\u00ab\u00a0A force de le chauffer, l&rsquo;oc\u00e9an devient un peu comme une bombe \u00e0 retardement\u00a0\u00bb, r\u00e9sume Catherine Jeandel.<\/p>\n<p>Et \u00ab\u00a0les projections sugg\u00e8rent que le r\u00e9chauffement historique des oc\u00e9ans est irr\u00e9versible au cours de ce si\u00e8cle\u00a0\u00bb, abonde l&rsquo;oc\u00e9anographe du centre Mercator Oc\u00e9an, Karina Von Schuckmann. Car si la temp\u00e9rature de la surface des mers pourrait se stabiliser rapidement en cas de r\u00e9duction forte des \u00e9missions de l&rsquo;humanit\u00e9, en revanche \u00ab\u00a0l&rsquo;oc\u00e9an profond s&rsquo;ajuste sur des si\u00e8cles ou des mill\u00e9naires\u00a0\u00bb, souligne la chercheuse, sp\u00e9cialiste du d\u00e9s\u00e9quilibre \u00e9nerg\u00e9tique de la Terre.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La surface des mers a battu en avril son record annuel et se maintient depuis \u00e0 des niveaux in\u00e9dits: le ph\u00e9nom\u00e8ne, alarmant mais sans surprise pour les scientifiques, illustre surtout comment les activit\u00e9s humaines ont transform\u00e9 les oc\u00e9ans en \u00ab\u00a0bombe \u00e0 retardement\u00a0\u00bb du r\u00e9chauffement climatique. D\u00e9but avril, la temp\u00e9rature moyenne \u00e0 la surface des oc\u00e9ans, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11737,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[2748,2752,356,2751],"class_list":["post-11736","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualite","tag-el-nino","tag-oceans-ayant-absorbe-90-de-lexces-de-chaleur","tag-rechauffement-climatique","tag-surface-des-oceans"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"La surface des mers a battu en avril son record annuel et se maintient depuis \u00e0 des niveaux in\u00e9dits: le ph\u00e9nom\u00e8ne, alarmant mais sans surprise pour les scientifiques, illustre surtout comment les activit\u00e9s humaines ont transform\u00e9 les oc\u00e9ans en &quot;bombe \u00e0 retardement&quot; du r\u00e9chauffement climatique. 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