{"id":443,"date":"2017-09-27T10:00:00","date_gmt":"2017-09-27T08:00:00","guid":{"rendered":"http:\/\/vandiepenbeeck.org\/?p=443"},"modified":"2017-09-27T10:00:00","modified_gmt":"2017-09-27T08:00:00","slug":"les-facteurs-qui-influencent-le-climat-partie-9","status":"publish","type":"post","link":"http:\/\/vandiepenbeeck.org\/?p=443","title":{"rendered":"Les facteurs qui influencent le climat &#8211; partie 9"},"content":{"rendered":"<h2>Causes des changements de climat \u00e0 grandes p\u00e9riodes \u2013 l\u2019obliquit\u00e9<\/h2>\n<p><!--more--><\/p>\n<p>L\u2019axe de rotation de la Terre est inclin\u00e9 par rapport au plan de translation de la Terre autour du Soleil. C\u2018est l\u2019obliquit\u00e9. Nous avons vu que c\u2019\u00e9tait la cause des saisons. Mais cette inclinaison varie au cours du temps. Actuellement elle est de 23\u00b0 26\u2019 13\u2019\u2019. Mais la valeur de l\u2019obliquit\u00e9 est comprise entre 22\u00b0 et 24,5\u00b0. Le temps pour passer d\u2019une position et revenir \u00e0 cette m\u00eame position est de 41&nbsp;000 ans (voir figue 11).<\/p>\n<p style=\"text-align: left;\"><a href=\"http:\/\/lameteo.blogs.lalibre.be\/media\/00\/02\/79560384.png\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" id=\"media-193389\" style=\"margin: 0.7em 0;\" title=\"\" src=\"http:\/\/lameteo.blogs.lalibre.be\/media\/00\/02\/3270801897.png\" alt=\"inclinaison_axe.png\" \/><\/a><\/p>\n<p>Figure 11 : variation de l&rsquo;obliquit\u00e9.<\/p>\n<p>&nbsp;<\/p>\n<p>Si l\u2019axe de la Terre n\u2019\u00e9tait pas inclin\u00e9, nous n\u2019aurions pas de saison car on aurait chaque jour de l\u2019ann\u00e9e des \u00e9quinoxes. Si l\u2019axe est peu inclin\u00e9, les saisons sont moins marqu\u00e9es, en revanche lorsque l\u2019axe est plus inclin\u00e9, les saisons sont plus contrast\u00e9es. Le cycle de l\u2019obliquit\u00e9 est repr\u00e9sent\u00e9 dans la figure 12.<\/p>\n<p style=\"text-align: left;\"><a href=\"http:\/\/lameteo.blogs.lalibre.be\/media\/00\/02\/2376020606.png\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" id=\"media-193390\" style=\"margin: 0.7em 0;\" title=\"\" src=\"http:\/\/lameteo.blogs.lalibre.be\/media\/00\/02\/1966171146.png\" alt=\"obliquite.png\" \/><\/a><\/p>\n<p>Figure 12: variation de l&rsquo;obliquit\u00e9 depuis 800 000 ans<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Causes des changements de climat \u00e0 grandes p\u00e9riodes \u2013 l\u2019obliquit\u00e9<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-443","post","type-post","status-publish","format-standard","hentry","category-meteo"],"_links":{"self":[{"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/posts\/443"}],"collection":[{"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=443"}],"version-history":[{"count":0,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=\/wp\/v2\/posts\/443\/revisions"}],"wp:attachment":[{"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=443"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=443"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/vandiepenbeeck.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=443"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}