{"id":25255,"date":"2023-10-17T12:00:15","date_gmt":"2023-10-17T10:00:15","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=25255"},"modified":"2023-10-10T13:12:35","modified_gmt":"2023-10-10T11:12:35","slug":"une-etude-revele-pourquoi-et-quand-le-desert-du-sahara-est-devenu-vert","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/une-etude-revele-pourquoi-et-quand-le-desert-du-sahara-est-devenu-vert\/","title":{"rendered":"Une \u00e9tude r\u00e9v\u00e8le pourquoi et quand le d\u00e9sert du Sahara est devenu vert"},"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>Notre plan\u00e8te a beaucoup \u00e9volu\u00e9 au cours de milliards d&rsquo;ann\u00e9es, de l&#8217;emplacement des continents \u00e0 la composition de l&rsquo;atmosph\u00e8re. Une nouvelle \u00e9tude examine en d\u00e9tail l&rsquo;histoire du d\u00e9sert du Sahara, qui n&rsquo;a pas toujours \u00e9t\u00e9 une r\u00e9gion sauvage et aride.<\/p>\n<p>Des chercheurs finlandais et britanniques ont reconstitu\u00e9 les transformations p\u00e9riodiques du Sahara sur 800 000 ans \u00e0 l&rsquo;aide d&rsquo;un nouveau mod\u00e8le climatique.<\/p>\n<p>Gr\u00e2ce \u00e0 l&rsquo;am\u00e9lioration de la pr\u00e9cision du mod\u00e8le, notamment en ce qui concerne la convection atmosph\u00e9rique et la propagation de la v\u00e9g\u00e9tation, l&rsquo;\u00e9quipe a pu combler certaines lacunes dans ce que nous savons de l&rsquo;histoire de la r\u00e9gion saharienne.<\/p>\n<p>\u00ab\u00a0La transformation cyclique du d\u00e9sert du Sahara en \u00e9cosyst\u00e8mes de savane et de for\u00eat est l&rsquo;un des changements environnementaux les plus remarquables de la plan\u00e8te\u00a0\u00bb, explique le climatologue Edward Armstrong, de l&rsquo;universit\u00e9 d&rsquo;Helsinki, en Finlande.<\/p>\n<p>\u00ab\u00a0Notre \u00e9tude est l&rsquo;une des premi\u00e8res \u00e9tudes de mod\u00e9lisation climatique \u00e0 simuler les p\u00e9riodes humides africaines avec une ampleur comparable \u00e0 ce que les observations pal\u00e9oclimatiques indiquent, r\u00e9v\u00e9lant pourquoi et quand ces \u00e9v\u00e9nements se sont produits.\u00a0\u00bb<\/p>\n<figure id=\"attachment_25256\" aria-describedby=\"caption-attachment-25256\" style=\"width: 642px\" class=\"wp-caption alignnone\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"25256\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/une-etude-revele-pourquoi-et-quand-le-desert-du-sahara-est-devenu-vert\/evolution-du-sahara-de-la-verdure-au-desert\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/Evolution-du-Sahara-de-la-verdure-au-desert.jpg?fit=642%2C459&amp;ssl=1\" data-orig-size=\"642,459\" 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=\"Evolution du Sahara de la verdure au desert\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Le Sahara n&amp;rsquo;a pas toujours \u00e9t\u00e9 aussi d\u00e9sertique. (Jani N\u00e4rhi\/Universit\u00e9 d&amp;rsquo;Helsinki)&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/Evolution-du-Sahara-de-la-verdure-au-desert.jpg?fit=642%2C459&amp;ssl=1\" class=\"size-full wp-image-25256\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/Evolution-du-Sahara-de-la-verdure-au-desert.jpg?resize=642%2C459&#038;ssl=1\" alt=\"\" width=\"642\" height=\"459\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/Evolution-du-Sahara-de-la-verdure-au-desert.jpg?w=642&amp;ssl=1 642w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/Evolution-du-Sahara-de-la-verdure-au-desert.jpg?resize=300%2C214&amp;ssl=1 300w\" sizes=\"auto, (max-width: 642px) 100vw, 642px\" \/><figcaption id=\"caption-attachment-25256\" class=\"wp-caption-text\">Le Sahara n&rsquo;a pas toujours \u00e9t\u00e9 aussi d\u00e9sertique. (Jani N\u00e4rhi\/Universit\u00e9 d&rsquo;Helsinki)<\/figcaption><\/figure>\n<p>Les chercheurs se sont particuli\u00e8rement int\u00e9ress\u00e9s \u00e0 ce que l&rsquo;on appelle les p\u00e9riodes humides africaines, des p\u00e9riodes au cours desquelles le continent africain \u00e9tait beaucoup plus humide et verdoyant qu&rsquo;il ne l&rsquo;est aujourd&rsquo;hui. Le mod\u00e8le climatique a \u00e9t\u00e9 utilis\u00e9 pour \u00e9tudier le calendrier et les forces motrices de ces p\u00e9riodes.<\/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>La mod\u00e9lisation a confirm\u00e9 une hypoth\u00e8se de longue date selon laquelle les p\u00e9riodes d&rsquo;humidit\u00e9 africaine sont d\u00e9termin\u00e9es par la pr\u00e9cession orbitale de la Terre : la fa\u00e7on dont elle oscille sur son axe au cours d&rsquo;un cycle de 21 000 ans, qui affecte \u00e0 son tour la variation entre les quatre saisons et la force du syst\u00e8me m\u00e9t\u00e9orologique de la mousson africaine.<\/p>\n<p>Comme le confirment d&rsquo;autres donn\u00e9es et tests, les pr\u00e9cessions auraient entra\u00een\u00e9 des \u00e9t\u00e9s plus chauds dans l&rsquo;h\u00e9misph\u00e8re nord, des moussons plus intenses en Afrique de l&rsquo;Ouest et, partant, des pr\u00e9cipitations plus abondantes dans le Sahara.<\/p>\n<p>Un autre r\u00e9sultat notable de l&rsquo;\u00e9tude est que pendant les p\u00e9riodes glaciaires &#8211; avec des glaciers g\u00e9ants couvrant les latitudes les plus \u00e9lev\u00e9es &#8211; les effets des oscillations de l&rsquo;orbite terrestre ont \u00e9t\u00e9 quelque peu annul\u00e9s, maintenant les r\u00e9gions septentrionales plus fra\u00eeches et limitant les moussons africaines.<\/p>\n<p>Savoir quand le Sahara \u00e9tait humide, vert et peupl\u00e9 d&rsquo;animaux tels que les hippopotames peut \u00e9galement nous en apprendre davantage sur l&rsquo;expansion de l&rsquo;humanit\u00e9 \u00e0 travers le monde. Ces p\u00e9riodes de verdure ont sans doute permis aux hommes (et \u00e0 d&rsquo;autres esp\u00e8ces) de se d\u00e9placer sur des \u00e9tendues du Sahara qui \u00e9taient habituellement tr\u00e8s difficiles \u00e0 traverser.<\/p>\n<p>\u00ab\u00a0Notre capacit\u00e9 \u00e0 mod\u00e9liser les p\u00e9riodes humides de l&rsquo;Afrique du Nord est une r\u00e9ussite majeure\u00a0\u00bb, d\u00e9clare Miikka Tallavaara, g\u00e9oscientifique \u00e0 l&rsquo;universit\u00e9 d&rsquo;Helsinki, \u00ab\u00a0et signifie que nous sommes d\u00e9sormais mieux \u00e0 m\u00eame de mod\u00e9liser les r\u00e9partitions humaines et de comprendre l&rsquo;\u00e9volution de notre genre en Afrique\u00a0\u00bb.<\/p>\n<p>La recherche a \u00e9t\u00e9 publi\u00e9e dans <a href=\"https:\/\/www.nature.com\/articles\/s41467-023-41219-4\" target=\"_blank\" rel=\"noopener\">Nature Communications<\/a>.<\/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:\/\/www.sciencealert.com\/hippos-in-the-desert-study-reveals-why-and-when-the-sahara-desert-turned-green\" target=\"_blank\" rel=\"noopener\">https:\/\/www.sciencealert.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"25255\">(661)<\/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>Notre plan\u00e8te a beaucoup \u00e9volu\u00e9 au cours de milliards d&rsquo;ann\u00e9es, de l&#8217;emplacement des continents \u00e0 la composition de l&rsquo;atmosph\u00e8re. Une&#8230;<\/p>\n","protected":false},"author":1,"featured_media":25257,"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":[33,20],"tags":[332,355,314,6523,636,329,1795],"class_list":["post-25255","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archeologie","category-climat","tag-desert","tag-evolution","tag-foret","tag-humide","tag-sahara","tag-secheresse","tag-verdure","wpcat-33-id","wpcat-20-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/desert-du-sahara.jpg?fit=1024%2C415&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-6zl","jetpack-related-posts":[{"id":14934,"url":"https:\/\/www.laterredufutur.com\/accueil\/et-si-le-sahara-etait-la-consequence-dune-agriculture-desastreuse-au-neolithique\/","url_meta":{"origin":25255,"position":0},"title":"Et si le Sahara \u00e9tait la cons\u00e9quence d&rsquo;une agriculture d\u00e9sastreuse au n\u00e9olithique ?","author":"Admin","date":"31 mars 2017","format":false,"excerpt":"Est-ce la s\u00e9dentarisation des humains dans les terres fertiles du d\u00e9sert qui aurait provoqu\u00e9 sa s\u00e9cheresse? C'est la nouvelle th\u00e9orie d'un arch\u00e9ologue. Le d\u00e9sert du Sahara, l'un des plus importants au monde, s'\u00e9tend sur quelque 9 millions de kilom\u00e8tres carr\u00e9s. Difficile d'imaginer que l'homme puisse en \u00eatre en partie \u00e0\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\/2017\/03\/Sahara-desert.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\/2017\/03\/Sahara-desert.jpg?fit=1024%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/03\/Sahara-desert.jpg?fit=1024%2C415&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/03\/Sahara-desert.jpg?fit=1024%2C415&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":25445,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-desert-du-sahara-etait-autrefois-une-savane-verdoyante\/","url_meta":{"origin":25255,"position":1},"title":"Le d\u00e9sert du Sahara \u00e9tait autrefois une savane verdoyante","author":"Admin","date":"22 d\u00e9cembre 2023","format":false,"excerpt":"Le plateau alg\u00e9rien du Tassili N'Ajjer est le plus grand parc national d'Afrique. Parmi ses vastes formations de gr\u00e8s se trouve peut-\u00eatre le plus grand mus\u00e9e d'art du monde. Plus de 15 000 gravures et peintures y sont expos\u00e9es, dont certaines datent de 11 000 ans selon les techniques de\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\/2021\/08\/sahara-vert.jpg?fit=1000%2C667&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/sahara-vert.jpg?fit=1000%2C667&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/sahara-vert.jpg?fit=1000%2C667&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/08\/sahara-vert.jpg?fit=1000%2C667&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":13262,"url":"https:\/\/www.laterredufutur.com\/accueil\/en-egypte-une-foret-a-pousse-au-coeur-du-sahara\/","url_meta":{"origin":25255,"position":2},"title":"En \u00c9gypte, une for\u00eat a pouss\u00e9 au c\u0153ur du Sahara","author":"Admin","date":"18 septembre 2016","format":false,"excerpt":"Faire pousser une for\u00eat au coeur du Sahara, c\u2019est possible. En Egypte, pays particuli\u00e8rement aride, des scientifiques ont fait le pari de transformer une partie du d\u00e9sert en terre fertile. Mission accomplie \u00e0 deux heures du Caire o\u00f9 une for\u00eat a vu le jour gr\u00e2ce aux eaux us\u00e9es. En r\u00e9gion\u2026","rel":"","context":"Dans &quot;Solutions&quot;","block_context":{"text":"Solutions","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/solutions\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":7740,"url":"https:\/\/www.laterredufutur.com\/accueil\/voila-4-900-ans-le-sahara-est-abruptement-passe-du-vert-au-jaune\/","url_meta":{"origin":25255,"position":3},"title":"Voil\u00e0 4.900 ans, le Sahara est abruptement pass\u00e9 du vert au jaune","author":"Admin","date":"18 ao\u00fbt 2015","format":false,"excerpt":"Le Sahara \u00e9tait couvert de prairies voici plus de 4.900 ans, durant la p\u00e9riode humide africaine. Des poussi\u00e8res emport\u00e9es par des vents, et d\u00e9pos\u00e9es dans l\u2019Atlantique, viennent de pr\u00e9ciser l\u2019histoire de cet \u00e9pisode marqu\u00e9 par d\u2019abrupts changements climatiques. Le nord de l\u2019Afrique \u00e9met chaque ann\u00e9e plus d\u2019un million de tonnes\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"pluie afrique","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":16123,"url":"https:\/\/www.laterredufutur.com\/accueil\/quand-le-sahara-etait-rempli-dherbe-darbres-et-dhommes\/","url_meta":{"origin":25255,"position":4},"title":"Quand le Sahara \u00e9tait rempli d&rsquo;herbe, d&rsquo;arbres et d&rsquo;Hommes","author":"Admin","date":"23 d\u00e9cembre 2017","format":false,"excerpt":"Il n\u2019y a que 6\u2009000 ans \u2014 qui \u00e0 l\u2019\u00e9chelle de l\u2019histoire de la Terre est presque n\u00e9gligeable \u2014 de la pluie tombait en abondance sur le nord du continent africain. Oui, il fut un temps o\u00f9 de la v\u00e9g\u00e9tation digne des jungles tropicales dominait ces espaces, aujourd\u2019hui parmi les\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\/2017\/12\/afrique-sahara-vert.jpg?fit=750%2C375&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/12\/afrique-sahara-vert.jpg?fit=750%2C375&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/12\/afrique-sahara-vert.jpg?fit=750%2C375&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/12\/afrique-sahara-vert.jpg?fit=750%2C375&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":24542,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-poussiere-du-sahara-entre-bienfaisance-et-nocivite\/","url_meta":{"origin":25255,"position":5},"title":"La poussi\u00e8re du Sahara entre bienfaisance et nocivit\u00e9","author":"Admin","date":"12 novembre 2022","format":false,"excerpt":"Tous les composants de notre plan\u00e8te ont de l\u2019importance, qu\u2019il s\u2019agisse des plus hautes montagnes ou des plus petits grains de poussi\u00e8re. 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