{"id":22965,"date":"2021-08-24T17:34:40","date_gmt":"2021-08-24T15:34:40","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=22965"},"modified":"2021-08-24T17:35:48","modified_gmt":"2021-08-24T15:35:48","slug":"depuis-20000-ans-le-niveau-des-oceans-a-fluctue-enormement-de-moins-de-120m-a-plus-de-90m","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/depuis-20000-ans-le-niveau-des-oceans-a-fluctue-enormement-de-moins-de-120m-a-plus-de-90m\/","title":{"rendered":"Depuis 20000 ans, le niveau des oc\u00e9ans a fluctu\u00e9 \u00e9norm\u00e9ment.. de moins de 120m \u00e0 plus de 90m"},"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>Une nouvelle \u00e9tude sugg\u00e8re que le niveau relatif de la mer en Colombie-Britannique (Canada) est rest\u00e9 10 m\u00e8tres plus haut qu&rsquo;aujourd&rsquo;hui jusqu&rsquo;\u00e0 ce qu&rsquo;il tombe \u00e0 son niveau actuel depuis 1800 ans.<\/p>\n<p>Deux autres nouvelles \u00e9tudes sugg\u00e8rent que le niveau des mers \u00e9tait encore de 0,8 \u00e0 1 m\u00e8tre plus \u00e9lev\u00e9 qu&rsquo;aujourd&rsquo;hui pendant la p\u00e9riode de r\u00e9chauffement m\u00e9di\u00e9val.<br \/>\nApr\u00e8s le pic de la derni\u00e8re glaciation, il y a environ 20 000 ans, le niveau relatif des mers est ensuite pass\u00e9 de 120 m\u00e8tres en dessous du niveau actuel des mers, puis il y a environ 14 500 ans \u00e0 des hauteurs de 90 m\u00e8tres au-dessus du niveau actuel, dans le canal Douglas, pr\u00e8s de la Colombie-Britannique, au Canada (<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0277379121001980\" target=\"_blank\" rel=\"noopener\">Letham et al., 2021<\/a>).<\/p>\n<p>Le niveau de la mer a ensuite baiss\u00e9 de 75 \u00e0 80 m\u00e8tres au cours des 3 000 ann\u00e9es suivantes, soit environ -2,5 m\u00e8tres par si\u00e8cle (-25 mm\/an), puis il est rest\u00e9 \u00e0 10-15 m au-dessus du niveau actuel pendant les 9 000 ans qui ont suivi.<\/p>\n<p>\u00a0\u00bb Nous d\u00e9terminons que le centre du canal Douglas \u00e9tait libre de glace apr\u00e8s le dernier maximum glaciaire vers -14 500 ans et que le niveau de la mer \u00e9tait au moins 90 m plus \u00e9lev\u00e9 qu&rsquo;aujourd&rsquo;hui. Le rebond isostatique a fait chuter le niveau de la mer \u00e0 21 m vers -11 500 ans, bien qu&rsquo;il ait pu y avoir une r\u00e9-avanc\u00e9e glaciaire qui aurait interrompu la chute du niveau de la mer vers le d\u00e9but du Dryas R\u00e9cent. Le niveau de la mer est tomb\u00e9 \u00e0 10-15 m vers -10 000 ans, et a continu\u00e9 \u00e0 baisser \u00e0 un rythme plus lent vers sa position actuelle, qu&rsquo;il a atteint il y a \u223c1800 ans.\u00a0\u00bb<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"22966\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/depuis-20000-ans-le-niveau-des-oceans-a-fluctue-enormement-de-moins-de-120m-a-plus-de-90m\/niveau-de-la-mer-14500-ans\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-14500-ans.jpg?fit=1110%2C537&amp;ssl=1\" data-orig-size=\"1110,537\" 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=\"niveau de la mer 14500 ans\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-14500-ans.jpg?fit=800%2C387&amp;ssl=1\" class=\"alignnone size-full wp-image-22966\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-14500-ans.jpg?resize=1110%2C537&#038;ssl=1\" alt=\"\" width=\"1110\" height=\"537\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-14500-ans.jpg?w=1110&amp;ssl=1 1110w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-14500-ans.jpg?resize=300%2C145&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-14500-ans.jpg?resize=800%2C387&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-14500-ans.jpg?resize=768%2C372&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>Image Source:&nbsp;<strong><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0277379121001980\">Letham et al., 2021<\/a><\/strong><\/p>\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0012821X20303873\" target=\"_blank\" rel=\"noopener\">Steffen et al<\/a>, 2020 ont propos\u00e9 que le niveau relatif de la mer atteigne un pic de 32 m\u00e8tres au-dessus du niveau actuel \u00e0 Nanotalik (sud du Groenland) pendant les derni\u00e8res \u00e9tapes de la derni\u00e8re p\u00e9riode glaciaire (il y a 13 800 ans).<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"22967\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/depuis-20000-ans-le-niveau-des-oceans-a-fluctue-enormement-de-moins-de-120m-a-plus-de-90m\/niveau-de-la-mer-32-m-10400-ans\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-32-m-10400-ans.jpg?fit=1110%2C665&amp;ssl=1\" data-orig-size=\"1110,665\" 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=\"niveau de la mer 32 m 10400 ans\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-32-m-10400-ans.jpg?fit=800%2C479&amp;ssl=1\" class=\"alignnone size-full wp-image-22967\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-32-m-10400-ans.jpg?resize=1110%2C665&#038;ssl=1\" alt=\"\" width=\"1110\" height=\"665\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-32-m-10400-ans.jpg?w=1110&amp;ssl=1 1110w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-32-m-10400-ans.jpg?resize=300%2C180&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-32-m-10400-ans.jpg?resize=800%2C479&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/niveau-de-la-mer-32-m-10400-ans.jpg?resize=768%2C460&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>Image Source:&nbsp;<strong><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0012821X20303873\">Steffen et al., 2020<\/a><\/strong><\/p>\n<p>Le niveau de la mer aurait \u00e9t\u00e9 environ 40 m\u00e8tres plus \u00e9lev\u00e9 qu&rsquo;aujourd&rsquo;hui il y a 15 000 ans le long des c\u00f4tes de l&rsquo;ouest de la Norv\u00e8ge (<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0277379119300253\" target=\"_blank\" rel=\"noopener\">Bondevik et al., 2019<\/a>).<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"22968\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/depuis-20000-ans-le-niveau-des-oceans-a-fluctue-enormement-de-moins-de-120m-a-plus-de-90m\/holocene-niveau-de-la-mer-40-metres-15000-ans\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-40-metres-15000-ans.jpg?fit=596%2C814&amp;ssl=1\" data-orig-size=\"596,814\" 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;1&quot;}\" data-image-title=\"Holocene-niveau de la mer 40 metres 15000 ans\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;credit https:\/\/www.ospo.noaa.gov\/&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-40-metres-15000-ans.jpg?fit=586%2C800&amp;ssl=1\" class=\"alignnone size-full wp-image-22968\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-40-metres-15000-ans.jpg?resize=596%2C814&#038;ssl=1\" alt=\"\" width=\"596\" height=\"814\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-40-metres-15000-ans.jpg?w=596&amp;ssl=1 596w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-40-metres-15000-ans.jpg?resize=220%2C300&amp;ssl=1 220w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-40-metres-15000-ans.jpg?resize=586%2C800&amp;ssl=1 586w\" sizes=\"auto, (max-width: 596px) 100vw, 596px\" \/><\/p>\n<p>Image Source:&nbsp;<strong><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0277379119300253\">Bondevik et al., 2019<\/a><\/strong><\/p>\n<p>Pour l&rsquo;h\u00e9misph\u00e8re sud, une \u00e9tude de 2011 (<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0277379111002320\" target=\"_blank\" rel=\"noopener\">Watcham et al.<\/a>) a indiqu\u00e9 que le niveau des mers de l&rsquo;Antarctique \u00e9tait au moins 15 m\u00e8tres au-dessus du niveau actuel il y a 9000 ans. La baisse du niveau des mers est continue depuis lors, avec une acc\u00e9l\u00e9ration particuli\u00e8rement prononc\u00e9e de la baisse du niveau des mers au cours des 500 derni\u00e8res ann\u00e9es.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"22969\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/depuis-20000-ans-le-niveau-des-oceans-a-fluctue-enormement-de-moins-de-120m-a-plus-de-90m\/holocene-niveau-de-la-mer-antarctique-15m\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-antarctique-15m.jpg?fit=1110%2C744&amp;ssl=1\" data-orig-size=\"1110,744\" 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=\"Holocene-niveau de la mer &amp;#8211; antarctique 15m\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-antarctique-15m.jpg?fit=800%2C536&amp;ssl=1\" class=\"alignnone size-full wp-image-22969\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-antarctique-15m.jpg?resize=1110%2C744&#038;ssl=1\" alt=\"\" width=\"1110\" height=\"744\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-antarctique-15m.jpg?w=1110&amp;ssl=1 1110w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-antarctique-15m.jpg?resize=300%2C201&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-antarctique-15m.jpg?resize=800%2C536&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/Holocene-niveau-de-la-mer-antarctique-15m.jpg?resize=768%2C515&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/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>Image Source:&nbsp;<strong><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0277379111002320\">Watcham et al., 2011<\/a><\/strong><\/p>\n<p>Deux nouvelles autres \u00e9tudes indiquent que le niveau relatif des mers le long des c\u00f4tes du Bangladesh (<a href=\"https:\/\/journals.sagepub.com\/doi\/full\/10.1177\/0959683621994671\" target=\"_blank\" rel=\"noopener\">Haque et Hoyanagi, 2021<\/a>) et de la mer de Chine m\u00e9ridionale (<a href=\"https:\/\/journals.sagepub.com\/doi\/full\/10.1177\/09596836211033215\" target=\"_blank\" rel=\"noopener\">Yan et al., 2021<\/a>) \u00e9tait encore sup\u00e9rieur d&rsquo;environ 0,8 \u00e0 1,2 m\u00e8tre \u00e0 celui d&rsquo;aujourd&rsquo;hui pendant la p\u00e9riode de r\u00e9chauffement m\u00e9di\u00e9val.<\/p>\n<p>Aucune de ces \u00e9tudes ne pr\u00e9sente de trajectoires du niveau de la mer qui s&rsquo;alignent, m\u00eame de loin, sur les changements de la concentration atmosph\u00e9rique de CO2 qui a vari\u00e9 de 230 ppm il y a 14 500 ans \u00e0 270 ppm pendant la p\u00e9riode de r\u00e9chauffement m\u00e9di\u00e9val.<\/p>\n<p><a href=\"https:\/\/journals.sagepub.com\/doi\/full\/10.1177\/0959683621994671\" target=\"_blank\" rel=\"noopener\">Haque et Hoyanagi, 2021<\/a><\/p>\n<p>\u00ab\u00a0Cette \u00e9tude illustre les influences du niveau de la mer sur le processus de d\u00e9p\u00f4t au cours des 1000 derni\u00e8res ann\u00e9es dans le delta sud-ouest du Bangladesh. &#8230; Pendant la p\u00e9riode 850-1300 AD, le RSL [niveau relatif de la mer] a \u00e9t\u00e9 atteint jusqu&rsquo;\u00e0 +80 cm plus haut que le niveau actuel o\u00f9 la boue jaune clair \u00e0 grise bioturb\u00e9e influenc\u00e9e par la mar\u00e9e s&rsquo;est d\u00e9pos\u00e9e dans la zone sup\u00e9rieure de la plaine du delta. Le RSL a chut\u00e9 jusqu&rsquo;\u00e0 -110 cm entre 1300 et 1850 apr\u00e8s J.-C.\u00a0\u00bb.<\/p>\n<p><a href=\"https:\/\/journals.sagepub.com\/doi\/full\/10.1177\/09596836211033215\" target=\"_blank\" rel=\"noopener\">Yan et al., 2021<\/a><\/p>\n<p>\u00ab\u00a0La roche de plage est consid\u00e9r\u00e9e comme une bonne archive pour les niveaux marins pass\u00e9s en raison de sa position de formation unique (zone intertidale). Pour \u00e9valuer l&rsquo;histoire du niveau de la mer dans le nord de la mer de Chine m\u00e9ridionale, trois affleurements rocheux de plage bien pr\u00e9serv\u00e9s (Beigang, Gongshanbei et Hengling) sur l&rsquo;\u00eele de Weizhou, dans le nord de la mer de Chine m\u00e9ridionale, ont \u00e9t\u00e9 s\u00e9lectionn\u00e9s pour examiner leur \u00e9l\u00e9vation relative et leurs caract\u00e9ristiques s\u00e9dimentologiques, min\u00e9ralogiques et g\u00e9ochimiques. Des branches d&rsquo;Acropora avec des micro-structures de surface bien pr\u00e9serv\u00e9es ont \u00e9t\u00e9 s\u00e9lectionn\u00e9es sur les beachrocks et utilis\u00e9es pour d\u00e9terminer les \u00e2ges de ces beachrocks par le biais de la datation de la s\u00e9rie U. Les r\u00e9sultats montrent que les branches d&rsquo;Acropora ont \u00e9t\u00e9 utilis\u00e9es pour d\u00e9terminer les \u00e2ges de ces beachrocks. Les r\u00e9sultats montrent que les beachrocks sont compos\u00e9s de s\u00e9diments de r\u00e9cifs coralliens, de clastiques terrig\u00e8nes, de clastiques volcaniques et de divers ciments de calcite. Ces s\u00e9diments accumul\u00e9s dans la zone intertidale de l&rsquo;\u00eele de Weizhou ont ensuite \u00e9t\u00e9 ciment\u00e9s dans un environnement d&rsquo;eau m\u00e9t\u00e9orique. Les \u00e2ges de la s\u00e9rie U des roches de plage de Beigang, Gongshanbei, et Hengling sont 1712-768 ca. BP, 1766-1070 ca. BP, et 1493-604 ca. BP (avant 1950 AD) respectivement. Leurs \u00e9l\u00e9vations sont respectivement de 0,91 \u00e0 1,16 m, 0,95 \u00e0 1,24 m et 0,82 \u00e0 1,17 m sup\u00e9rieures \u00e0 celles des zones s\u00e9dimentaires homologues modernes. Par cons\u00e9quent, nous avons conclu que le niveau de la mer \u00e0 l&rsquo;\u00e8re Meghalayan (1766-604 ca. BP) \u00e9tait de 0,82-1,24 m plus \u00e9lev\u00e9 que le niveau actuel, et que le niveau de la mer au cours de cette p\u00e9riode a montr\u00e9 une tendance \u00e0 la baisse.\u00a0\u00bb<\/p>\n<p>Adaptation <a href=\"https:\/\/www.laterredufutur.com\/accueil\/\" target=\"_blank\" rel=\"noopener\">Terra Projects<\/a><\/p>\n<p>Source : <a href=\"https:\/\/wattsupwiththat.com\/2021\/08\/24\/sea-levels-near-b-c-canada-were-90-meters-higher-than-today-14500-years-ago\/\" target=\"_blank\" rel=\"noopener\">https:\/\/wattsupwiththat.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"22965\">(8040)<\/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>Une nouvelle \u00e9tude sugg\u00e8re que le niveau relatif de la mer en Colombie-Britannique (Canada) est rest\u00e9 10 m\u00e8tres plus haut&#8230;<\/p>\n","protected":false},"author":1,"featured_media":22970,"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":"Depuis 20000 ans, le niveau des #oc\u00e9ans ont fluctu\u00e9 \u00e9norm\u00e9ment.. de moins de 120m \u00e0 plus de 90m @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":[33],"tags":[846,4074,1106,2190,241],"class_list":["post-22965","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archeologie","tag-fluctuations","tag-holocene","tag-mer","tag-niveau","tag-ocean","wpcat-33-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/plage-colombie-britanique.jpg?fit=1024%2C679&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-5Yp","jetpack-related-posts":[{"id":26790,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-niveau-des-mers-sest-eleve-de-38m-apres-la-derniere-periode-glaciaire\/","url_meta":{"origin":22965,"position":0},"title":"Le niveau des mers s&rsquo;est \u00e9lev\u00e9 de 38m apr\u00e8s la derni\u00e8re p\u00e9riode glaciaire","author":"Admin","date":"27 mars 2025","format":false,"excerpt":"De nouvelles recherches r\u00e9v\u00e8lent qu'apr\u00e8s la derni\u00e8re p\u00e9riode glaciaire, le niveau des mers s'est \u00e9lev\u00e9 rapidement sur une p\u00e9riode d'environ 8 000 ans. Des \u00e9chantillons pr\u00e9lev\u00e9s dans les profondeurs de la mer ont r\u00e9v\u00e9l\u00e9 \u00e0 quel point le niveau des mers a chang\u00e9 apr\u00e8s la derni\u00e8re p\u00e9riode glaciaire. La fonte\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/10\/groenland2015.jpg?fit=819%2C613&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/10\/groenland2015.jpg?fit=819%2C613&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/10\/groenland2015.jpg?fit=819%2C613&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/10\/groenland2015.jpg?fit=819%2C613&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":23177,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-mysterieuse-foret-de-mangrove-mexicaine-est-piegee-dans-le-temps-dune-epoque-ou-les-oceans-etaient-plus-eleves-quaujourdhui\/","url_meta":{"origin":22965,"position":1},"title":"La myst\u00e9rieuse for\u00eat de mangrove mexicaine est \u00abpi\u00e9g\u00e9e dans le temps\u00bb d&rsquo;une \u00e9poque o\u00f9 les oc\u00e9ans \u00e9taient plus \u00e9lev\u00e9s qu&rsquo;aujourd&rsquo;hui","author":"Admin","date":"13 octobre 2021","format":false,"excerpt":"Des scientifiques ont d\u00e9couvert l'origine d'une myst\u00e9rieuse for\u00eat de mangroves enclav\u00e9e au c\u0153ur de la p\u00e9ninsule du Yucat\u00e1n au Mexique. Les chercheurs se trouvaient \u00e0 plus de 160 km de la c\u00f4te, \u00e9cumant la rivi\u00e8re San Pedro Mart\u00edr non loin de la fronti\u00e8re entre le Mexique et le Guatemala, lorsqu\u2019ils\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/10\/mangrove-palutiviers-mexique-lagon-el-cachuate.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/10\/mangrove-palutiviers-mexique-lagon-el-cachuate.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/10\/mangrove-palutiviers-mexique-lagon-el-cachuate.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/10\/mangrove-palutiviers-mexique-lagon-el-cachuate.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/10\/mangrove-palutiviers-mexique-lagon-el-cachuate.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":25722,"url":"https:\/\/www.laterredufutur.com\/accueil\/quand-le-niveau-de-la-mer-a-t-il-ete-le-plus-eleve\/","url_meta":{"origin":22965,"position":2},"title":"Quand le niveau de la mer a-t-il \u00e9t\u00e9 le plus \u00e9lev\u00e9 ?","author":"Admin","date":"1 avril 2024","format":false,"excerpt":"Le niveau de la mer \u00e9tait exceptionnellement \u00e9lev\u00e9 pendant la derni\u00e8re p\u00e9riode de l'\u00e8re des dinosaures. Mais il est possible que le niveau des oc\u00e9ans ait \u00e9t\u00e9 encore plus \u00e9lev\u00e9 auparavant. Le niveau des mers s'\u00e9l\u00e8ve \u00e0 mesure que le climat fait fondre rapidement les glaciers et les calottes glaciaires\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/03\/vagues-cotieres.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/03\/vagues-cotieres.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/03\/vagues-cotieres.jpg?fit=1024%2C1024&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/03\/vagues-cotieres.jpg?fit=1024%2C1024&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":20563,"url":"https:\/\/www.laterredufutur.com\/accueil\/augmentation-extreme-du-niveau-de-la-mer-il-y-a-130-000-ans\/","url_meta":{"origin":22965,"position":3},"title":"Augmentation extr\u00eame du niveau de la mer il y a 130 000 ans","author":"Admin","date":"16 mars 2020","format":false,"excerpt":"La hausse des temp\u00e9ratures des oc\u00e9ans il y a plus de 100 000 ans a entra\u00een\u00e9 la fonte des calottes glaciaires de l'Antarctique et provoqu\u00e9 une \u00e9l\u00e9vation extr\u00eame du niveau de la mer, comme le montre une nouvelle \u00e9tude internationale impliquant l'Universit\u00e9 de Bonn. Selon les scientifiques, la situation actuelle\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\/2020\/02\/antarctique.jpg?fit=1024%2C768&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/02\/antarctique.jpg?fit=1024%2C768&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/02\/antarctique.jpg?fit=1024%2C768&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/02\/antarctique.jpg?fit=1024%2C768&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":3397,"url":"https:\/\/www.laterredufutur.com\/accueil\/changement-climatique-majeur\/","url_meta":{"origin":22965,"position":4},"title":"Changement Climatique Majeur","author":"Admin","date":"5 avril 2006","format":false,"excerpt":"L'oc\u00e9an et ses habitants seront affect\u00e9s de mani\u00e8re irr\u00e9versible par les effets du r\u00e9chauffement mondial et des changements climatiques. Les scientifiques expliquent que le r\u00e9chauffement de la plan\u00e8te augmente les temp\u00e9ratures de l'eau de la mer, va augmenter le niveau des mers et des oc\u00e9ans et modifier les courants oc\u00e9aniques.\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":"","width":0,"height":0},"classes":[]},{"id":4385,"url":"https:\/\/www.laterredufutur.com\/accueil\/et-si-leden-avait-ete-retrouve\/","url_meta":{"origin":22965,"position":5},"title":"Et si l&rsquo;Eden avait \u00e9t\u00e9 retrouv\u00e9 ?","author":"Admin","date":"11 avril 2008","format":false,"excerpt":"Le jardin d'\u00c9den (h\u00e9b. \u05d2\u05df \u05e2\u05d3\u05df, jardin des d\u00e9lices) est, selon les trois religions monoth\u00e9istes n\u00e9es au Moyen-Orient (juda\u00efsme, christianisme, islam et leurs variantes), un endroit parfait dans lequel arrivent les hommes justes apr\u00e8s leur mort, en guise de salaire pour leurs bonnes actions r\u00e9alis\u00e9es de leur vivant. Son existence\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/spaw\/images\/golf-12000.jpg?resize=350%2C200","width":350,"height":200},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/22965","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=22965"}],"version-history":[{"count":2,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/22965\/revisions"}],"predecessor-version":[{"id":22972,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/22965\/revisions\/22972"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/22970"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=22965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=22965"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=22965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}