{"id":2383,"date":"2024-06-06T13:28:45","date_gmt":"2024-06-06T11:28:45","guid":{"rendered":"https:\/\/svt-dalaine.fr\/svt\/?page_id=2383"},"modified":"2026-03-25T10:18:39","modified_gmt":"2026-03-25T09:18:39","slug":"bg-c12-latmosphere-et-locean","status":"publish","type":"page","link":"https:\/\/svt-dalaine.fr\/svt\/bg-c12-latmosphere-et-locean\/","title":{"rendered":"BG-C1&2 L’atmosph\u00e8re et l’oc\u00e9an"},"content":{"rendered":"\t\t
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Extrait du B.O.<\/p>

L\u2019atmosph\u00e8re et l\u2019hydrosph\u00e8re forment les enveloppes fluides de la Terre. L\u2019hydrosph\u00e8re et l\u2019atmosph\u00e8re, enveloppes externes fluides, sont stratifi\u00e9es. Leur structuration verticale d\u00e9pend de la densit\u00e9, comme pour les enveloppes solides.<\/p>

Les disparit\u00e9s temporelles et locales du bilan radiatif conduisent \u00e0 une in\u00e9gale r\u00e9partition de l\u2019\u00e9nergie \u00e0 la surface de la Terre. Les circulations troposph\u00e9riques et oc\u00e9aniques assurent principalement une redistribution latitudinale de l\u2019\u00e9nergie. Les \u00e9changes d\u2019\u00e9nergie ont lieu par transferts radiatifs, conductifs et convectifs incluant les variations d\u2019enthalpie li\u00e9s aux changements d\u2019\u00e9tat de l\u2019eau.<\/p>

La circulation de l\u2019atmosph\u00e8re repose sur l\u2019existence des cellules de convection. On distingue la circulation aux latitudes tropicales et la circulation aux latitudes temp\u00e9r\u00e9es.<\/p>

Le couplage entre l\u2019atmosph\u00e8re et l\u2019oc\u00e9an se fait par des \u00e9changes de quantit\u00e9 de mouvement, de transferts thermiques et de quantit\u00e9 d\u2019eau. La circulation de surface est \u00e9troitement coupl\u00e9e au r\u00e9gime des vents et aux gradients thermiques.\u00a0 La circulation g\u00e9n\u00e9rale de l\u2019oc\u00e9an se caract\u00e9rise par une circulation m\u00e9ridienne de retournement.\u00a0 Elle r\u00e9sulte principalement des variations de densit\u00e9 de l\u2019eau de mer li\u00e9es \u00e0 sa temp\u00e9rature et \u00e0 sa salinit\u00e9.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Extrait du B.O. L\u2019atmosph\u00e8re et l\u2019hydrosph\u00e8re forment les enveloppes fluides de la Terre. L\u2019hydrosph\u00e8re et l\u2019atmosph\u00e8re, enveloppes externes fluides, sont stratifi\u00e9es. Leur structuration verticale d\u00e9pend de la densit\u00e9, comme pour les enveloppes solides. Les disparit\u00e9s temporelles et locales du bilan… Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2383","page","type-page","status-publish","hentry"],"yoast_head":"\nBG-C1&2 L'atmosph\u00e8re et l'oc\u00e9an - Bienvenue sur le site de Sciences de la Vie et de la Terre<\/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:\/\/svt-dalaine.fr\/svt\/bg-c12-latmosphere-et-locean\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"BG-C1&2 L'atmosph\u00e8re et l'oc\u00e9an - Bienvenue sur le site de Sciences de la Vie et de la Terre\" \/>\n<meta property=\"og:description\" content=\"Extrait du B.O. L\u2019atmosph\u00e8re et l\u2019hydrosph\u00e8re forment les enveloppes fluides de la Terre. L\u2019hydrosph\u00e8re et l\u2019atmosph\u00e8re, enveloppes externes fluides, sont stratifi\u00e9es. Leur structuration verticale d\u00e9pend de la densit\u00e9, comme pour les enveloppes solides. 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