{"id":10540,"date":"2023-08-20T00:00:00","date_gmt":"2023-08-20T00:00:00","guid":{"rendered":"https:\/\/www.mercator-ocean.eu\/vagues-chaleur-europe-18-aout-2023\/"},"modified":"2023-08-20T00:00:00","modified_gmt":"2023-08-20T00:00:00","slug":"vagues-chaleur-europe-18-aout-2023","status":"publish","type":"post","link":"https:\/\/www.mercator-ocean.eu\/fr\/vagues-chaleur-europe-18-aout-2023\/","title":{"rendered":"Mercator Ocean Bulletin : vagues de chaleur marine au 18 Ao\u00fbt"},"content":{"rendered":"<div style=\"margin-top: 0px; margin-bottom: 0px;\" class=\"sharethis-inline-share-buttons\" ><\/div>\n<p>Les oc\u00e9anographes de Mercator Ocean International examinent les vagues de chaleur marine \u00e0 travers l&rsquo;oc\u00e9an mondial pour le mois d&rsquo;Ao\u00fbt. Ils analysent une vari\u00e9t\u00e9 d&rsquo;ensembles de donn\u00e9es allant des analyses d&rsquo;observation (cartes de temp\u00e9rature de surface de la mer par satellite) aux analyses de mod\u00e8les (assimilant les observations par satellite et in situ) et aux pr\u00e9visions de mod\u00e8les.<a href=\"#_ftn1\"><\/a><\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/www.mercator-ocean.eu\/wp-content\/uploads\/2023\/08\/categ_global_GLO12_ANA_2023-08-15-1024x561.jpg\" alt=\"\" class=\"wp-image-29929\"\/><figcaption><em>Figure 1: Carte des cat\u00e9gories de vagues de chaleur marine pour le 15 Ao\u00fbt 2023 dans l&rsquo;ensemble de l&rsquo;oc\u00e9an mondial. Analyse GLORYS 12. Source: Mercator Ocean Internationa<\/em>l<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/www.mercator-ocean.eu\/wp-content\/uploads\/2023\/08\/Anom_global_GLO12_FCST_2023-08-15-1024x637.jpg\" alt=\"\" class=\"wp-image-29931\"\/><figcaption><em>Figure 2: Anomalie de temp\u00e9rature de surface du syst\u00e8me d\u2019analyse et de pr\u00e9vision GLO12 (Mercator Ocean International) en moyenne sur les 7 jours pr\u00e9c\u00e9dant le 22 ao\u00fbt 2023. Source&nbsp;: Mercator Ocean International<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Bilan pour le 15 Ao\u00fbt&nbsp;&nbsp;<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Zone Europe&nbsp;:<ul><li>La vague de chaleur du bassin M\u00e9diterran\u00e9en a pratiquement disparu.<\/li><\/ul><ul><li>La vague de chaleur marine pr\u00e9sente dans l\u2019Atlantique \u00e0 l\u2019ouest de la p\u00e9ninsule ib\u00e9rique passe de niveau mod\u00e9r\u00e9 \u00e0 fort. Les anomalies hebdomadaires de temp\u00e9rature atteignent +1.5\u00b0C<\/li><\/ul><\/li><\/ul>\n\n\n\n<ul class=\"wp-block-list\"><li>Zone Globale&nbsp;:<ul><li>Le Pacifique tropical est toujours en condition de vague de chaleur mod\u00e9r\u00e9e \u00e0 forte atteignant l\u2019intensit\u00e9 forte pr\u00e8s des c\u00f4tes du P\u00e9rou, ce qui est coh\u00e9rent avec les conditions El Ni\u00f1o actuelles.<\/li><\/ul><ul><li>Les vagues de chaleur marines dans le Pacifique Nord ont diminu\u00e9 en \u00e9tendue et en intensit\u00e9 (condition de vague de chaleur marine mod\u00e9r\u00e9e actuellement)<\/li><\/ul><ul><li>La vague de chaleur de l\u2019Atlantique tropical nord est toujours pr\u00e9sente, d\u2019intensit\u00e9 mod\u00e9r\u00e9e \u00e0 forte.<\/li><\/ul><ul><li>Une vague de chaleur au sud de la mer d\u2019Arabie se d\u00e9veloppe et atteint la cat\u00e9gorie forte localement.<\/li><\/ul><ul><li>Les anomalies hebdomadaires de temp\u00e9rature atteignent +2\u00b0C, +1.5\u00b0C, +3\u00b0C pour respectivement les zones l\u2019Atlantique Nord (Mer du Labrador), Atlantique tropical et Pacifique tropical Est.<\/li><\/ul><ul><li>Les zones concern\u00e9es du Pacifique tropical et Atlantique tropical, ainsi que Pacifique Nord continuent de subir des temp\u00e9ratures extr\u00eames depuis plus de 30 jours.<\/li><\/ul><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"> Pr\u00e9visions pour le 22 Ao\u00fbt&nbsp;&nbsp;<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Zone Europe&nbsp;:<ul><li>Pour le 22 aout, il se pr\u00e9voit un renforcement de la vague de chaleur marine autour de la p\u00e9ninsule ib\u00e9rique, c\u00f4t\u00e9 Atlantique et c\u00f4t\u00e9 M\u00e9diterran\u00e9e, avec des intensit\u00e9s fortes \u00e0 s\u00e9v\u00e8res.<\/li><\/ul><ul><li>Les anomalies hebdomadaires de temp\u00e9rature seront proches de +2\u00b0C autour de la p\u00e9ninsule ib\u00e9rique<\/li><\/ul><\/li><\/ul>\n\n\n\n<ul class=\"wp-block-list\"><li>Zone Globale&nbsp;:<ul><li>Pour le 22 aout, Mercator Ocean International pr\u00e9voit le maintien des temp\u00e9ratures extr\u00eames dans le pacifique \u00e9quatorial et l\u2019Atlantique Nord (Mer du Labrador).<\/li><\/ul><ul><li>Dans l\u2019Atlantique tropical nord une augmentation d\u2019intensit\u00e9 de la vague de chaleur marine est pr\u00e9vue avec un niveau fort et m\u00eame atteignant localement la cat\u00e9gorie s\u00e9v\u00e8re.<\/li><\/ul><ul><li>Les anomalies hebdomadaires de temp\u00e9rature sont de l\u2019ordre de +2\u00b0C \u00e0 3\u00b0C, +1\u00b0C, +2 \u00e0 +3\u00b0C, +1\u00b0C pour respectivement les zones l\u2019Atlantique Nord (Mer du Labrador), Atlantique tropical, Pacifique tropical Est et mer d\u2019Arabie.<\/li><\/ul><\/li><\/ul>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Qu&rsquo;est-ce qu&rsquo;une vague de chaleur marine? <\/h2>\n\n\n\n<p>Les vagues de chaleur marine sont des hausses extr\u00eames de la temp\u00e9rature de l&rsquo;oc\u00e9an pendant une p\u00e9riode prolong\u00e9e. Elles peuvent se produire \u00e0 diff\u00e9rents endroits de l&rsquo;oc\u00e9an, et leur ampleur et leur fr\u00e9quence ont augment\u00e9 au cours des deux derni\u00e8res d\u00e9cennies, ce qui a eu des effets n\u00e9fastes sur les \u00e9cosyst\u00e8mes et les activit\u00e9s humaines. Selon le dernier rapport publi\u00e9 par le groupe d&rsquo;experts intergouvernemental sur l&rsquo;\u00e9volution du climat (GIEC AR6 SYR), on estime avec un degr\u00e9 de confiance \u00e9lev\u00e9 qu&rsquo;\u00e0 court terme, avec un r\u00e9chauffement plan\u00e9taire de 1,5 \u00b0C, la fr\u00e9quence croissante des vagues de chaleur marine augmentera les risques de perte de biodiversit\u00e9 dans les oc\u00e9ans, notamment en raison d&rsquo;\u00e9v\u00e9nements de mortalit\u00e9 massive.<a href=\"#_ftn1\"><\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comment sont calcul\u00e9es les vagues de chaleur marine\u202f?&nbsp;<\/h2>\n\n\n\n<p>Une vague de chaleur marine est un \u00e9pisode de chaleur durant lequel la temp\u00e9rature est nettement sup\u00e9rieure \u00e0 la normale pendant un minimum de 5 jours cons\u00e9cutifs.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/www.mercator-ocean.eu\/wp-content\/uploads\/2023\/07\/Picture2-4.png\" alt=\"\" class=\"wp-image-29802\" width=\"557\" height=\"365\"\/><\/figure><\/div>\n\n\n\n<p class=\"has-text-align-center\">F<em>igure adapt\u00e9e de Hobday et al. (2018)<\/em><\/p>\n\n\n\n<p>La normale est d\u00e9finie journali\u00e8rement selon une p\u00e9riode climatique suffisamment longue (ici 1993-2016). Ainsi, Pour un endroit et un jour donn\u00e9, connaissant toutes les temp\u00e9ratures de surface observ\u00e9es sur les 30 derni\u00e8res ann\u00e9es, on qualifie une situation de vague de chaleur lorsque la temp\u00e9rature mesur\u00e9e est comprise dans les 10% des valeurs maximales observ\u00e9es (c\u2019est \u00e0 dire au-dessus du 90\u00e8me quantile, voir sch\u00e9ma), et cela au moins 5 jours de suite. &nbsp;&nbsp;&nbsp;&nbsp;<\/p>\n\n\n\n<p>Les caract\u00e9ristiques principales des vagues de chaleur sont sa dur\u00e9e et son intensit\u00e9. L\u2019intensit\u00e9 pour un jour donn\u00e9 correspond \u00e0 la valeur en degr\u00e9 au-dessus du 90\u00e8me quantile (fl\u00e8che bleue), nous pouvons soit calculer l\u2019intensit\u00e9 cumul\u00e9e pendant toute l\u2019\u00e9v\u00e8nement de chaleur, ou relever l\u2019intensit\u00e9 maximale.<\/p>\n\n\n\n<p>Les vagues de chaleur sont cat\u00e9goris\u00e9es \u00e0 partir de leur \u00e9cart \u00e0 la temp\u00e9rature moyenne ou anomalie (fl\u00e8che verte)&nbsp;: un \u00e9cart sup\u00e9rieur \u00e0 2 fois l\u2019\u00e9cart entre le 90\u00e8me quantile et la moyenne correspond \u00e0 une vague de chaleur de cat\u00e9gorie forte&nbsp;; un \u00e9cart sup\u00e9rieur \u00e0 3 fois, de cat\u00e9gorie s\u00e9v\u00e8re&nbsp;; et un \u00e9cart sup\u00e9rieur \u00e0 4 fois de cat\u00e9gorie extr\u00eame. &nbsp;<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p><a href=\"https:\/\/www.mercator-ocean.eu\/wp-admin\/post.php?lang=fr&amp;action=edit&amp;post_type=post&amp;post=29627#_ftnref1\"><\/a> Analyse des cartes d\u2019analyse de SST OSTIA (Copernicus Marine Service), OISST (NOAA), GLO12 (Copernicus Marine Service \/ Mercator Ocean International), PSY4 (Copernicus Marine Service \/ Mercator Ocean International), et de pr\u00e9vision GLO12 et PSY4<\/p>\n\n\n\n<p><a href=\"#_ftnref1\"><\/a><a href=\"https:\/\/www.mercator-ocean.eu\/wp-admin\/post.php?post=29627&amp;action=edit#_ftnref1\"><\/a> IPCC AR6 SYR chapter 4.3 https:\/\/www.ipcc.ch\/report\/ar6\/syr\/downloads\/report\/IPCC_AR6_SYR_LongerReport.pdf<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les oc\u00e9anographes de Mercator Ocean International examinent les vagues de chaleur marine \u00e0 travers l&rsquo;oc\u00e9an mondial pour le mois d&rsquo;Ao\u00fbt. Ils analysent une vari\u00e9t\u00e9 d&rsquo;ensembles de donn\u00e9es allant des analyses d&rsquo;observation (cartes de temp\u00e9rature de surface de la mer par satellite) aux analyses de mod\u00e8les (assimilant les observations par satellite et in situ) et aux [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":7314,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"translation-status":[],"class_list":["post-10540","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mercator Ocean Bulletin : vagues de chaleur marine au 18 Ao\u00fbt - Mercator Ocean International<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mercator-ocean.eu\/fr\/vagues-chaleur-europe-18-aout-2023\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mercator Ocean Bulletin : vagues de chaleur marine au 18 Ao\u00fbt - Mercator Ocean International\" \/>\n<meta property=\"og:description\" content=\"Les oc\u00e9anographes de Mercator Ocean International examinent les vagues de chaleur marine \u00e0 travers l&rsquo;oc\u00e9an mondial pour le mois d&rsquo;Ao\u00fbt. Ils analysent une vari\u00e9t\u00e9 d&rsquo;ensembles de donn\u00e9es allant des analyses d&rsquo;observation (cartes de temp\u00e9rature de surface de la mer par satellite) aux analyses de mod\u00e8les (assimilant les observations par satellite et in situ) et aux [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.mercator-ocean.eu\/fr\/vagues-chaleur-europe-18-aout-2023\/\" \/>\n<meta property=\"og:site_name\" content=\"Mercator Ocean International\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/MercatorOcean\" \/>\n<meta property=\"article:published_time\" content=\"2023-08-20T00:00:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.mercator-ocean.eu\/wp-content\/uploads\/2024\/03\/MarineHeatWaveBulletin_BG2LogoBlanc-min.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1080\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Damien Goubeau\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@MercatorOcean\" \/>\n<meta name=\"twitter:site\" content=\"@MercatorOcean\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Damien Goubeau\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.mercator-ocean.eu\\\/fr\\\/vagues-chaleur-europe-18-aout-2023\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.mercator-ocean.eu\\\/fr\\\/vagues-chaleur-europe-18-aout-2023\\\/\"},\"author\":{\"name\":\"Damien Goubeau\",\"@id\":\"https:\\\/\\\/www.mercator-ocean.eu\\\/fr\\\/#\\\/schema\\\/person\\\/8707759d6e2641e91ea76ae3fc537134\"},\"headline\":\"Mercator Ocean Bulletin : vagues de chaleur marine au 18 Ao\u00fbt\",\"datePublished\":\"2023-08-20T00:00:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.mercator-ocean.eu\\\/fr\\\/vagues-chaleur-europe-18-aout-2023\\\/\"},\"wordCount\":970,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.mercator-ocean.eu\\\/fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.mercator-ocean.eu\\\/fr\\\/vagues-chaleur-europe-18-aout-2023\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.mercator-ocean.eu\\\/wp-content\\\/uploads\\\/2024\\\/03\\\/MarineHeatWaveBulletin_BG2LogoBlanc-min.png\",\"articleSection\":[\"Actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.mercator-ocean.eu\\\/fr\\\/vagues-chaleur-europe-18-aout-2023\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.mercator-ocean.eu\\\/fr\\\/vagues-chaleur-europe-18-aout-2023\\\/\",\"url\":\"https:\\\/\\\/www.mercator-ocean.eu\\\/fr\\\/vagues-chaleur-europe-18-aout-2023\\\/\",\"name\":\"Mercator Ocean Bulletin : vagues de chaleur marine au 18 Ao\u00fbt - 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