{"id":3063,"date":"2024-02-04T12:48:41","date_gmt":"2024-02-04T11:48:41","guid":{"rendered":"http:\/\/thibault-svt.fr\/index.php\/terminales\/specialite-2\/theme-2-atmosphere-hydrosphere-climats-du-passe-a-lavenir\/rappels-climato\/"},"modified":"2024-02-04T13:11:22","modified_gmt":"2024-02-04T12:11:22","slug":"rappels-climato","status":"publish","type":"page","link":"http:\/\/thibault-svt.fr\/index.php\/terminales\/specialite-2\/theme-2-atmosphere-hydrosphere-climats-du-passe-a-lavenir\/rappels-climato\/","title":{"rendered":"Rappels Climato"},"content":{"rendered":"<h2 style=\"text-align: center;\"><span style=\"text-decoration: underline;\"><span style=\"color: #800080;\"><strong>QUELQUES RAPPELS EN CLIMATOLOGIE<\/strong><\/span><\/span><\/h2>\n<p><span style=\"text-decoration: underline;\"><span id=\"actualisme\" style=\"color: #ff00ff;\"><strong>PRINCIPE D&rsquo;ACTUALISME<\/strong><\/span><\/span><\/p>\n<p>Pour d\u00e9terminer des <strong>pal\u00e9oclimats <\/strong>(= climats anciens), diff\u00e9rents indices peuvent \u00eatre utilis\u00e9s (pollens, fossiles, indices isotopiques, indices g\u00e9ologiques \u2026)<\/p>\n<p>Pour d\u00e9duire les climats anciens \u00e0 partir de ces indices, on utilise souvent <strong>le principe d\u2019actualisme <\/strong>(aussi appel\u00e9 <strong>principe d\u2019uniformitarisme<\/strong>), qui pose que <strong>\u00ab\u00a0les lois qui r\u00e9gissaient les processus biologiques et g\u00e9ologiques dans le pass\u00e9 sont les m\u00eames que dans le pr\u00e9sent\u00a0\u00bb<\/strong><\/p>\n<p>Cela signifie par exemple que :<\/p>\n<p>&#8211; Un \u00eatre vivant pass\u00e9 avait les m\u00eames conditions de vie que les \u00eatres vivants d\u2019esp\u00e8ce proche aujourd\u2019hui<\/p>\n<p>&#8211; Une formation g\u00e9ologique du pass\u00e9 s\u2019est form\u00e9e dans les m\u00eames conditions que la m\u00eame formation g\u00e9ologique aujourd\u2019hui \u2026<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\"><strong><span id=\"alb\u00e9do\" style=\"color: #ff00ff; text-decoration: underline;\">ALBEDO <\/span><\/strong><\/span><br \/>\nQuantit\u00e9 d\u2019\u00e9nergie r\u00e9fl\u00e9chie par la surface terrestre.<br \/>\nD\u00e9pends du type de surface : la glace r\u00e9fl\u00e9chit plus que la foret par exemple, donc si la Terre est recouverte de glace elle aura tendance \u00e0 se refroidir.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-3067\" src=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2024\/02\/albedo.jpg\" alt=\"\" width=\"1140\" height=\"817\" srcset=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2024\/02\/albedo.jpg 1140w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2024\/02\/albedo-300x215.jpg 300w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2024\/02\/albedo-1024x734.jpg 1024w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2024\/02\/albedo-768x550.jpg 768w, http:\/\/thibault-svt.fr\/wp-content\/uploads\/2024\/02\/albedo-900x645.jpg 900w\" sizes=\"auto, (max-width: 1140px) 100vw, 1140px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><u><b><span id=\"serre\" style=\"color: #ff00ff;\">EFFET DE SERRE\u00a0<\/span><br \/>\n<\/b><\/u><u><b> <img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3068 alignleft\" src=\"http:\/\/thibault-svt.fr\/wp-content\/uploads\/2024\/02\/effet-de-serre.jpg\" alt=\"\" width=\"166\" height=\"136\" \/><\/b><\/u>Quantit\u00e9 d\u2019\u00e9nergie renvoy\u00e9e sur Terre par les gaz atmosph\u00e9riques (CO2 ou H20 par exemple)<br \/>\nD\u00e9pends de la [CO2]atmosph\u00e9rique qui d\u00e9pends elle-m\u00eame du cycle du carbone<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>QUELQUES RAPPELS EN CLIMATOLOGIE PRINCIPE D&rsquo;ACTUALISME Pour d\u00e9terminer des pal\u00e9oclimats (= climats anciens), diff\u00e9rents indices peuvent \u00eatre utilis\u00e9s (pollens, fossiles, indices isotopiques, indices g\u00e9ologiques \u2026) Pour d\u00e9duire les climats anciens \u00e0 partir de ces indices, on utilise souvent le principe d\u2019actualisme (aussi appel\u00e9 principe d\u2019uniformitarisme), qui pose que \u00ab\u00a0les lois qui r\u00e9gissaient les processus biologiques [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":145,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3063","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - 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