{"id":22865,"date":"2025-07-11T15:48:28","date_gmt":"2025-07-11T13:48:28","guid":{"rendered":"https:\/\/www.mio.osupytheas.fr\/?p=22865"},"modified":"2025-07-11T16:32:36","modified_gmt":"2025-07-11T14:32:36","slug":"les-derniers-resultats-du-projet-hope","status":"publish","type":"post","link":"https:\/\/www.mio.osupytheas.fr\/fr\/les-derniers-resultats-du-projet-hope\/","title":{"rendered":"Plong\u00e9e au c\u0153ur de la pompe biologique \u00e0 carbone en milieu tropical !"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"22865\" class=\"elementor elementor-22865\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c6dab04 e-flex e-con-boxed e-con e-parent\" data-id=\"c6dab04\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e3e8378 elementor-widget elementor-widget-text-editor\" data-id=\"e3e8378\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: justify;\">Les premiers r\u00e9sultats de la bou\u00e9e\u00a0HOPE\u00a0sont l\u00e0\u2026 et\u00a0nous montrent que le pi\u00e9geage du carbone par l\u2019oc\u00e9an tropical est un processus hautement dynamique\u00a0!<\/p><p style=\"text-align: justify;\">Gr\u00e2ce \u00e0 un \u00e9chantillonnage\u00a0horaire\u00a0in\u00e9dit, la bou\u00e9e HOPE nous r\u00e9v\u00e8le une\u00a0variabilit\u00e9 insoup\u00e7onn\u00e9e\u00a0au sein de l\u2019\u00e9cosyst\u00e8me marin. En l\u2019espace de quelques heures seulement, la quantit\u00e9 de plancton en surface \u2013 ces micro-organismes qui fixent le CO\u2082 \u2013 peut\u00a0\u00eatre multipli\u00e9e par 4, entra\u00eenant des variations importantes dans la qualit\u00e9 et la quantit\u00e9 de la\u00a0neige marine\u00a0(ces particules riches en carbone qui coulent vers les abysses),\u00a0modulant \u00e0 l&#8217;\u00e9chelle du jour la quantit\u00e9 de carbone pi\u00e9g\u00e9e dans les profondeurs\u2026<\/p><p style=\"text-align: justify;\">L\u2019aventure ne fait que commencer, et la bou\u00e9e HOPE, \u00e9l\u00e9gamment op\u00e9r\u00e9e par <a href=\"https:\/\/www.linkedin.com\/in\/ACoAADmJREIBK8MF1onF7RsvTdkCXSqAZLNCYi0\" target=\"_blank\" rel=\"noopener\">Jordan Duch\u00eane-Candido<\/a>, promet de nous livrer des pr\u00e9cieuses connaissances pour mieux comprendre le tr\u00e8s complexe processus de pompe biologique \u00e0 carbone sur ces dynamiques fines encore largement m\u00e9connues.<\/p><p style=\"text-align: justify;\"><strong>Objectif<\/strong> : mieux comprendre, mod\u00e9liser et pr\u00e9voir la pompe biologique \u00e0 carbone, un processus cl\u00e9 dans la r\u00e9gulation du climat.<\/p><p style=\"text-align: justify;\">Dans l\u2019oc\u00e9an tropical, les diazotrophes jouent un r\u00f4le majeur, notamment en \u00e9t\u00e9 austral (Novembre-avril), o\u00f9 ces organismes g\u00e9n\u00e8rent de majestueuses efflorescences, et agissent comme un engrais naturel, boostant la chaine alimentaire et la pompe \u00e0 carbone.<\/p><p style=\"text-align: justify;\"><strong>Derni\u00e8re surprise en date<\/strong> : des efflorescences spectaculaires de Trichodesmium, un diazotrophe tropical, observ\u00e9es en plein hiver austral, autour de la bou\u00e9e HOPE\u2026 Des \u00e9v\u00e9nements rares en hiver, probablement li\u00e9s \u00e0 une vague de chaleur marine durable en Nouvelle-Cal\u00e9donie (cf. carte Mercator Ocean)*. Ce ph\u00e9nom\u00e8ne pourrait profond\u00e9ment impacter l\u2019\u00e9cosyst\u00e8me marin hauturier, ce que nous cherchons \u00e0 d\u00e9terminer en partenariat avec le <a href=\"https:\/\/mahewa.fr\" target=\"_blank\" rel=\"noopener\">projet PPR maHeWa<\/a>, co-pilot\u00e9 par Sophie Cravatte.<\/p><p style=\"text-align: justify;\">Cette efflorescence nous a permis de lancer des exp\u00e9riences en laboratoire avec les doctorants <a href=\"https:\/\/www.linkedin.com\/in\/ACoAAEdUM6ABx6AXY4f0RXrYZL7bWVtOqVZeqas\" target=\"_blank\" rel=\"noopener\">Ambroise Delis\u00e9e<\/a>, <a href=\"https:\/\/www.linkedin.com\/in\/ACoAADRoS_wBXabJ6kGINxOznOg5c2tPLWkcj8I\" target=\"_blank\" rel=\"noopener\">Matthieu Savarino<\/a> et notre coll\u00e8gue microbiologiste <a href=\"https:\/\/www.linkedin.com\/in\/ACoAAAgEqRYB6_w66yAhnz3wawO26ocap8v907k\" target=\"_blank\" rel=\"noopener\">Mercedes Camps<\/a> pour\u00a0\u00e9tudier la fa\u00e7on dont ces organismes forment la neige marine, \u00e0 quelle vitesse elle coule, et \u00e0 quelle vitesse elle est recycl\u00e9e, afin d\u2019\u00e9valuer la part de carbone issue de ces organismes qui est stock\u00e9e durablement au fond de l\u2019oc\u00e9an.<\/p><p style=\"text-align: justify;\"><strong>Une histoire de science<\/strong>, de collaborations, et d\u2019oc\u00e9an en transformation.<\/p><p style=\"text-align: justify;\">La suite au prochain num\u00e9ro\u2026<\/p><p style=\"text-align: justify;\">*Mercator Ocean, Copernicus marine Service, en partenariat avec le projet maHeWa effectue des pr\u00e9visions des vagues de chaleur marines \u00e0 l&#8217;\u00e9chelle globale, et fournissent dans le cadre de maHeWa des &#8220;zoom&#8221; NC, en analyse de la situation actuelle, et en pr\u00e9vision\u00a0: <a href=\"https:\/\/lnkd.in\/gFT-TvXM\" target=\"_blank\" rel=\"noopener\">https:\/\/lnkd.in\/gFT-TvXM<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element 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dynamique\u00a0!Gr\u00e2ce \u00e0 un \u00e9chantillonnage\u00a0horaire\u00a0in\u00e9dit, la bou\u00e9e HOPE nous r\u00e9v\u00e8le [&hellip;]<\/p>\n","protected":false},"author":319,"featured_media":22867,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[28],"tags":[],"class_list":["post-22865","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-avancees-scientifiques"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/posts\/22865","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/users\/319"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/comments?post=22865"}],"version-history":[{"count":15,"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/posts\/22865\/revisions"}],"predecessor-version":[{"id":22890,"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/posts\/22865\/revisions\/22890"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/media\/22867"}],"wp:attachment":[{"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/media?parent=22865"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/categories?post=22865"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mio.osupytheas.fr\/fr\/wp-json\/wp\/v2\/tags?post=22865"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}