{"id":20931,"date":"2023-10-17T14:53:12","date_gmt":"2023-10-17T14:53:12","guid":{"rendered":"https:\/\/snipool.com\/?p=20931"},"modified":"2023-10-17T14:53:12","modified_gmt":"2023-10-17T14:53:12","slug":"un-hiver-volcanique","status":"publish","type":"post","link":"https:\/\/snipool.com\/fr\/un-hiver-volcanique\/","title":{"rendered":"Un hiver volcanique"},"content":{"rendered":"<p>Le volcan Toba<\/p>\n<p>L\u2019\u00e9ruption du volcan Toba, en Indon\u00e9sie, s\u2019est produite il y a 73 500 ans. Le volcan a \u00e9ject\u00e9 6 000 km<sup>3 <\/sup>de cendres et de d\u00e9bris. L\u2019\u00e9ruption a liber\u00e9 une grande quantit\u00e9 de dioxyde de soufre \u00e0 l\u2019\u00e9tat gazeux dans la stratosph\u00e8re. La combinaison avec l\u2019eau atmosph\u00e8rique a donn\u00e9 5 milliards de tonnes d\u2019acide sulfurique sous forme d\u2019a\u00e9rosols. Diffus\u00e9es sur toute la plan\u00e8te, ces gouttelettes auraient absorb\u00e9 le rayonnement silaire, en provoquant le refroidissement \u00e0 la surface de la Terre. Ce ph\u00e9nom\u00e8ne m\u00e9t\u00e9orologique a donn\u00e9 naissance \u00e0 un hiver \u00ab\u00a0volcanique\u00a0\u00bb froid, rigoureux et tr\u00e8s long, pendant lequel de nombreuses esp\u00e8ces animali\u00e8res et v\u00e9g\u00e9tales p\u00e9rirent.<\/p>\n<p>Le volcan Tambora<\/p>\n<p>Tambora est un petit volcan, nich\u00e9 dans une des \u00eeles de la Sonde, \u00e0 l\u2019est de Bali. Le 5 avril 1815, la r\u00e9gion est frapp\u00e9e par la premi\u00e8re de toute une s\u00e9rie de gigantesques explosions.<\/p>\n<p>Sir Stamfort Raffes, gouverneur britanique en poste \u00e0 Java, a d\u00e9crit le cataclysme\u00a0: les d\u00e9tonations \u00e9taient si fortes qu\u2019elles furent entendues sur l\u2019\u00eele de Sumatra, \u00e0 1 600 km de distance. Le gouverneur d\u00e9crit trois impressionnantes \u00ab\u00a0colonnes de flammes\u00a0\u00bb, qui s\u2019\u00e9l\u00e8vent tr\u00e8s haut. Des blocs de roches s\u2019abattent \u00e0 10 km du volcan. La nu\u00e9e de cendres est si importante, qu\u2019elle plonge la r\u00e9gion dans l\u2019obscurit\u00e9 totale, jusqu\u2019\u00e0 Java, situ\u00e9e \u00e0 plus de 500 km de distance.<\/p>\n<p>Cette gigantesque explosion a provoqu\u00e9 un refroidissement spectaculaire dans l\u2019h\u00e9misph\u00e8re nord de la plan\u00e8te. Et l\u2019\u00e9pais manteau de cendres, qui recouvrait Sumbawa, ne permettait pas de r\u00e9colter cette ann\u00e9e. L\u2019explosion elle-m\u00eame, la famine et les maladies, provoqu\u00e9es par Tambora, tu\u00e8rent environ 82 000 personnes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le volcan Toba L\u2019\u00e9ruption du volcan Toba, en Indon\u00e9sie, s\u2019est produite il y a 73 500 ans. Le volcan a \u00e9ject\u00e9 6 000 km3 de cendres et de d\u00e9bris. L\u2019\u00e9ruption a liber\u00e9 une grande quantit\u00e9 de dioxyde de soufre \u00e0 l\u2019\u00e9tat gazeux dans la stratosph\u00e8re. La combinaison avec l\u2019eau atmosph\u00e8rique a donn\u00e9 5 milliards de &hellip;<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1088],"tags":[6477,6471,6475,6478,6474,6476,6479,6472,1290,3488,6473],"class_list":["post-20931","post","type-post","status-publish","format-standard","hentry","category-interessant","tag-bali","tag-eruption","tag-explosion","tag-hiver","tag-iles","tag-java","tag-lhemisphere-nord-de-la-planete","tag-le-volcan-tambora","tag-planete","tag-volcan","tag-volcan-toba"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Un hiver volcanique - Snipool<\/title>\n<meta name=\"description\" content=\"L\u2019\u00e9ruption du volcan Toba, en Indon\u00e9sie, s\u2019est produite il y a 73 500 ans. 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