{"id":5084,"date":"2025-09-23T01:45:02","date_gmt":"2025-09-22T23:45:02","guid":{"rendered":"https:\/\/www.polarpod.net\/?page_id=5084"},"modified":"2026-02-08T23:43:46","modified_gmt":"2026-02-08T22:43:46","slug":"encyclopedie-polaire-le-bilan-energetique-solaire","status":"publish","type":"page","link":"https:\/\/www.polarpod.fr\/fr\/encyclopedie-polaire\/encyclopedie-polaire-le-bilan-energetique-solaire\/","title":{"rendered":"Encyclop\u00e9die polaire \u2013 le bilan \u00e9nerg\u00e9tique solaire"},"content":{"rendered":"[vc_row type=\u00a0\u00bbfull_width_background\u00a0\u00bb full_screen_row_position=\u00a0\u00bbmiddle\u00a0\u00bb column_margin=\u00a0\u00bbdefault\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bg_color=\u00a0\u00bb#454156″ scene_position=\u00a0\u00bbcenter\u00a0\u00bb top_padding=\u00a0\u00bb4%\u00a0\u00bb 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LE BILAN \u00c9NERG\u00c9TIQUE SOLAIRE<\/span><\/h2>\n[\/vc_column_text][\/vc_column_inner][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/6″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb column_padding_type=\u00a0\u00bbdefault\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb][nectar_icon icon_family=\u00a0\u00bblinea\u00a0\u00bb icon_style=\u00a0\u00bbshadow-bg\u00a0\u00bb icon_color_type=\u00a0\u00bbcolor_scheme\u00a0\u00bb icon_color=\u00a0\u00bbAccent-Color\u00a0\u00bb open_new_tab=\u00a0\u00bbtrue\u00a0\u00bb icon_padding=\u00a0\u00bb5px\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb url=\u00a0\u00bbhttps:\/\/www.polarpod.net\/wp-content\/uploads\/2025\/09\/BILAN_ENERGETIQUE_SOLAIRE.pdf\u00a0\u00bb icon_size=\u00a0\u00bb40″ icon_linea=\u00a0\u00bbicon-basic-printer\u00a0\u00bb][\/vc_column_inner][\/vc_row_inner][vc_row_inner equal_height=\u00a0\u00bbyes\u00a0\u00bb column_margin=\u00a0\u00bbcustom\u00a0\u00bb column_margin_custom=\u00a0\u00bb2px\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bottom_padding=\u00a0\u00bb2%\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_position=\u00a0\u00bbdefault\u00a0\u00bb row_position_tablet=\u00a0\u00bbinherit\u00a0\u00bb row_position_phone=\u00a0\u00bbinherit\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/1″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\n
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LE SOLEIL, CHAUFFAGE DE LA TERRE<\/span><\/h3>\n
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Une formidable source d\u2019\u00e9nergie r\u00e9chauffe notre plan\u00e8te : le Soleil. Une partie des rayons qui arrivent sur la Terre est r\u00e9fl\u00e9chie ou absorb\u00e9e par l\u2019atmosph\u00e8re. Le reste atteint le sol, qui en r\u00e9fl\u00e9chit et en absorbe \u00e0 nouveau. Amosph\u00e8re et sol (ou oc\u00e9an) r\u00e9chauff\u00e9s, \u00e9mettent \u00e0 leur tour des rayonnements dits infrarouges vers l\u2019espace. La diff\u00e9rence entre l\u2019\u00e9nergie gagn\u00e9e par la Terre et la chaleur renvoy\u00e9e s\u2019appelle le bilan radiatif (r\u00e9gional ou pour toute la plan\u00e8te).<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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TROPIQUES CHAUDS, P\u00d4LES FROIDS<\/span><\/h3>\n

La Terre n\u2019est pas uniform\u00e9ment chauff\u00e9e par le Soleil : l\u2019Equateur re\u00e7oit plus d\u2019\u00e9nergie que les p\u00f4les. En effet, la Terre est ronde et \u201cpench\u00e9e\u201d sur son axe. Aux p\u00f4les, les rayons solaires sont donc rasants ; ils traversent une plus grande couche d\u2019atmosph\u00e8re, absorbant beaucoup d\u2019\u00e9nergie, et la \u201cchaleur\u201d re\u00e7ue se r\u00e9partit sur une surface plus grande.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner column_margin=\u00a0\u00bbcustom\u00a0\u00bb column_margin_custom=\u00a0\u00bb10px\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bottom_padding=\u00a0\u00bb2%\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_position=\u00a0\u00bbdefault\u00a0\u00bb row_position_tablet=\u00a0\u00bbinherit\u00a0\u00bb row_position_phone=\u00a0\u00bbinherit\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/1″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\n

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DEUX PUITS DE FROID<\/span><\/h3>\n
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En hiver, la nuit polaire est tr\u00e8s longue. Sans soleil, il fait froid ; de plus, la Terre continue \u00e0 renvoyer vers l\u2019espace son propre rayonnement : elle perd donc encore de la chaleur. En \u00e9t\u00e9, neige et glace renvoient comme un miroir une grande partie des rayons du Soleil sans les absorber (alb\u00e9do). Au total, les r\u00e9gions polaires perdent davantage d\u2019\u00e9nergie qu\u2019elles n\u2019en re\u00e7oivent.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner column_margin=\u00a0\u00bbcustom\u00a0\u00bb column_margin_custom=\u00a0\u00bb10px\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bottom_padding=\u00a0\u00bb2%\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_position=\u00a0\u00bbdefault\u00a0\u00bb row_position_tablet=\u00a0\u00bbinherit\u00a0\u00bb row_position_phone=\u00a0\u00bbinherit\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb2\/3″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb column_padding_type=\u00a0\u00bbdefault\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\n

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AUTOUR DU GLOBE : DES \u00c9CHANGES DE CHALEUR<\/span><\/h3>\n
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Les p\u00f4les devraient devenir de plus en plus froids et les zones tropicales plus chaudes ; mais cet exc\u00e8s de chaleur tropicale est absorb\u00e9 par l\u2019oc\u00e9an et l\u2019atmosph\u00e8re, qui le transportent vers les r\u00e9gions froides. Ainsi s\u2019\u00e9tablit un \u00e9quilibre global. Cependant, \u00e0 l\u2019\u00e9chelle plan\u00e9taire, si le bilan radiatif devient positif, la Terre se r\u00e9chauffe; s\u2019il est n\u00e9gatif, elle se refroidit.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/3″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\"\"[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner column_margin=\u00a0\u00bbcustom\u00a0\u00bb column_margin_custom=\u00a0\u00bb10px\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bottom_padding=\u00a0\u00bb2%\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_position=\u00a0\u00bbdefault\u00a0\u00bb row_position_tablet=\u00a0\u00bbinherit\u00a0\u00bb row_position_phone=\u00a0\u00bbinherit\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/3″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb column_padding_type=\u00a0\u00bbdefault\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\"\"[\/vc_column_text][\/vc_column_inner][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb2\/3″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\n

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VISIBLE OU INFRAROUGE ? \u00c0 CHACUN SON RAYONNEMENT<\/span><\/h3>\n
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Le Soleil \u00e9met essentiellement des ondes \u00e9lectromagn\u00e9tiques de longueurs d\u2019onde courtes (<4\u00b5m), dont la lumi\u00e8re visible. Une partie de cette \u00e9nergie est r\u00e9\u00e9mise par la Terre sous forme d\u2019ondes \u00e9lectromagn\u00e9tiques de grandes longueurs (>4\u00b5m) : c\u2019est-\u00e0-dire dans l\u2019infrarouge dit thermique ; car la Terre, comme tout corps \u201cchaud\u201d, se comporte comme un radiateur : elle rayonne vers l\u2019espace.
\nActuellement, le flux solaire mesur\u00e9 au sommet de l\u2019atmosph\u00e8re \u00e0 quelques dizaines de kilom\u00e8tres d\u2019altitude, est en moyenne de 340 watts par m2 (en fait, 1 368 W\/m2 sur une surface qui serait partout perpendiculaire au flux lumineux : mais la Terre est une sph\u00e8re\u2026). Sol et atmosph\u00e8re r\u00e9fl\u00e9chissent en moyenne 30% du flux solaire. Le reste, environ 240 watts par m2 absorb\u00e9s et transform\u00e9s en chaleur, est utilis\u00e9 pour maintenir la temp\u00e9rature, mettre en mouvement l\u2019atmosph\u00e8re et l\u2019oc\u00e9an, \u00e9vaporer l\u2019eau, etc., alimentant ainsi la \u201cmachine thermique\u201d que constitue la plan\u00e8te et r\u00e9glant les climats.
\nUn flux \u00e0 peu pr\u00e8s \u00e9quivalent aux 240 watts par m2 apport\u00e9 par le Soleil est r\u00e9\u00e9mis vers l\u2019espace.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner column_margin=\u00a0\u00bbcustom\u00a0\u00bb column_margin_custom=\u00a0\u00bb10px\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bottom_padding=\u00a0\u00bb2%\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_position=\u00a0\u00bbdefault\u00a0\u00bb row_position_tablet=\u00a0\u00bbinherit\u00a0\u00bb row_position_phone=\u00a0\u00bbinherit\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb2\/3″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb column_padding_type=\u00a0\u00bbdefault\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\n

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HIVER ET \u00c9T\u00c9 POLAIRES<\/span><\/h3>\n
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Aux hautes latitudes, en hiver, il n\u2019y a pas de rayonnement solaire : la nuit dure 6 mois au p\u00f4le, 4 mois \u00e0 80\u00b0 de latitude et 2 mois \u00e0 70\u00b0. Il fait donc tr\u00e8s froid, car il y a non seulement tr\u00e8s peu d\u2019apport calorifique, mais en plus, l\u2019\u00e9mission de rayonnement infrarouge \u201cthermique\u201d persiste (bien que neige et banquise forment un manteau isolant, qui limite cette perte).
\nEn \u00e9t\u00e9 au contraire, l\u2019ensoleillement 24 h sur 24 est tr\u00e8s favorable au r\u00e9chauffement : pendant 2 mois environ, aux alentours du solstice, le nombre de calories par m2 re\u00e7u par jour est plus important aux p\u00f4les qu\u2019\u00e0 la latitude de 40\u00b0 ! L\u2019effet est renforc\u00e9 par d\u2019autres facteurs (orientation, etc.), de sorte que, parfois, les temp\u00e9ratures sont relativement hautes pendant une petite partie de l\u2019ann\u00e9e. Cependant, le soleil demeure bas (moins de 150 watts\/m2 au sol), et neige et glace renvoient jusqu\u2019\u00e0 80% de la radiation solaire (alb\u00e9do) : l\u2019\u00e9nergie r\u00e9fl\u00e9chie par la Terre vers l\u2019espace est donc toujours tr\u00e8s importante aux p\u00f4les, m\u00eame en \u00e9t\u00e9. De ce fait, les calottes glaciaires restent en place et la fonte de la banquise est tardive.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/3″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\"\"[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner equal_height=\u00a0\u00bbyes\u00a0\u00bb column_margin=\u00a0\u00bbcustom\u00a0\u00bb column_margin_custom=\u00a0\u00bb2px\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bottom_padding=\u00a0\u00bb2%\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_position=\u00a0\u00bbdefault\u00a0\u00bb row_position_tablet=\u00a0\u00bbinherit\u00a0\u00bb row_position_phone=\u00a0\u00bbinherit\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/1″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb column_padding_type=\u00a0\u00bbdefault\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\n

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L\u2019\u00c9NERGIE R\u00c9FL\u00c9CHIE PAR LA TERRE (ALB\u00c9DO)<\/span><\/h3>\n\n\n\n\n\n\n\n\n\n\n
Neige fra\u00eeche froide<\/td>\njusqu’\u00e0 90 \u00e0 98%<\/td>\n<\/tr>\n
Neige fondante<\/td>\n50 \u00e0 60%<\/td>\n<\/tr>\n
Neige fondue, sale<\/td>\n40%<\/td>\n<\/tr>\n
Glacier<\/td>\n50%<\/td>\n<\/tr>\n
Oc\u00e9an<\/td>\n5 \u00e0 15%<\/td>\n<\/tr>\n
Glaces de mer<\/td>\n50 \u00e0 85%<\/td>\n<\/tr>\n
D\u00e9sert de sable<\/td>\njusqu’\u00e0 35%<\/td>\n<\/tr>\n
Roches nues<\/td>\n20 \u00e0 25%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner column_margin=\u00a0\u00bbcustom\u00a0\u00bb column_margin_custom=\u00a0\u00bb10px\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bottom_padding=\u00a0\u00bb2%\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_position=\u00a0\u00bbdefault\u00a0\u00bb row_position_tablet=\u00a0\u00bbinherit\u00a0\u00bb row_position_phone=\u00a0\u00bbinherit\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/3″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb column_padding_type=\u00a0\u00bbdefault\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\"\"[\/vc_column_text][\/vc_column_inner][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb2\/3″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\n
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EFFET DE SERRE ET BILAN RADIATIF<\/span><\/h3>\n
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Si l\u2019atmosph\u00e8re \u00e9tait totalement transparente au rayonnement infrarouge \u00e9mis par la Terre, il ferait beaucoup plus froid (en moyenne -18 \u00b0C) ; mais l\u2019atmosph\u00e8re (gaz, vapeur d\u2019eau) absorbe une partie de ce rayonnement et renvoie \u00e0 son tour un rayonnement infrarouge vers la Terre, qui conserve ainsi une temp\u00e9rature moyenne de +15 \u00b0C : c\u2019est l\u2019effet de serre.
\nLa temp\u00e9rature \u00e0 la surface due \u00e0 ce ph\u00e9nom\u00e8ne correspond \u00e0 un flux thermique IR ascendant de quelque 390 W\/m2 ; 240 seront perdus vers l\u2019espace, l\u2019atmosph\u00e8re en retenant 150 (effet de serre) ; \u00e0 cela, se rajoutent dans l\u2019atmosph\u00e8re 100 W\/m2 d\u2019\u00e9nergie non radiative \u201cremontant\u201d du sol (convection\u2026) et 80, absorb\u00e9s directement sur les 240 d\u2019\u00e9nergie solaire incidente. C\u2019est donc en fin de compte 330 W\/m2 qui se trouvent \u201cpris\u201d dans l\u2019atmosph\u00e8re et rayonnent vers le sol (flux thermique IR descendant).
\nToute augmentation de l\u2019effet de serre tend \u00e0 augmenter ce bilan, en diminuant l\u2019\u00e9nergie \u00e9mise.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner equal_height=\u00a0\u00bbyes\u00a0\u00bb column_margin=\u00a0\u00bbcustom\u00a0\u00bb column_margin_custom=\u00a0\u00bb2px\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bottom_padding=\u00a0\u00bb2%\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_position=\u00a0\u00bbdefault\u00a0\u00bb row_position_tablet=\u00a0\u00bbinherit\u00a0\u00bb row_position_phone=\u00a0\u00bbinherit\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/1″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb column_padding_type=\u00a0\u00bbdefault\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\n

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DES SATELLITES AU CHEVET DE LA TERRE<\/span><\/h3>\n

Le climat est la cons\u00e9quence du bilan radiatif plan\u00e9taire. Conna\u00eetre ce bilan avec le maximum de pr\u00e9cision est un enjeu essentiel pour surveiller l\u2019\u00e9volution des climats. Les satellites mesurent le bilan radiatif au sommet de l\u2019atmosph\u00e8re, en watts par m\u00e8tre carr\u00e9. Lorsque le bilan global est nul, la Terre reste en \u00e9quilibre thermique. Si ce bilan devient positif, la Terre se r\u00e9chauffe ; s\u2019il est n\u00e9gatif, elle se refroidit.
\nToutes les derni\u00e8res mesures semblent indiquer un bilan positif.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner equal_height=\u00a0\u00bbyes\u00a0\u00bb column_margin=\u00a0\u00bbcustom\u00a0\u00bb column_margin_custom=\u00a0\u00bb2px\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bottom_padding=\u00a0\u00bb2%\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_position=\u00a0\u00bbdefault\u00a0\u00bb row_position_tablet=\u00a0\u00bbinherit\u00a0\u00bb row_position_phone=\u00a0\u00bbinherit\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/1″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb column_padding_type=\u00a0\u00bbdefault\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\n

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LE COIN DES PHYSICIENS<\/span><\/h3>\n
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Tout corps \u00e9met une \u00e9nergie thermique W (en joules) \u00e9quivalente \u00e0 celle d\u2019un \u201ccorps noir\u201d, uniquement fonction de sa temp\u00e9rature absolue T (en Kelvin) selon la loi W=sT4, o\u00f9 s est un coefficient constant (loi de Stephan). Ainsi en est-il du Soleil, mais aussi de la Terre, de l\u2019oc\u00e9an, de la glace, etc.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner equal_height=\u00a0\u00bbyes\u00a0\u00bb column_margin=\u00a0\u00bbcustom\u00a0\u00bb column_margin_custom=\u00a0\u00bb2px\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb bottom_padding=\u00a0\u00bb2%\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_position=\u00a0\u00bbdefault\u00a0\u00bb row_position_tablet=\u00a0\u00bbinherit\u00a0\u00bb row_position_phone=\u00a0\u00bbinherit\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb pointer_events=\u00a0\u00bball\u00a0\u00bb][vc_column_inner column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/1″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb column_padding_type=\u00a0\u00bbdefault\u00a0\u00bb gradient_type=\u00a0\u00bbdefault\u00a0\u00bb][vc_column_text css=\u00a0\u00bb\u00a0\u00bb text_direction=\u00a0\u00bbdefault\u00a0\u00bb]\n

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LE SAVIEZ-VOUS ?<\/span><\/h3>\n

Notre plan\u00e8te n\u2019intercepte qu\u2019une toute petite partie (un milliardi\u00e8me) de l\u2019\u00e9nergie \u00e9mise par le Soleil. Ce qui correspond tout de m\u00eame \u00e0 10 000 fois plus de puissance (175 millions de m\u00e9gawatts) que celle consomm\u00e9e par l\u2019humanit\u00e9 ! Le flux g\u00e9othermique issu de la chaleur interne de notre globe est, quant \u00e0 lui, 4 000 fois inf\u00e9rieur (0,09 W\/m2).<\/p>\n

La glace de mer est capable de stopper presque totalement les \u00e9changes entre l\u2019oc\u00e9an et l\u2019atmosph\u00e8re. On parle de couvercle thermique. L\u2019\u00e9tanch\u00e9it\u00e9 de ce couvercle d\u00e9pend de sa distribution et de son \u00e9paisseur. Elle pr\u00e9sente cependant une certaine transparence vis-\u00e0-vis du rayonnement solaire qui rend possible la p\u00e9n\u00e9tration partielle de la lumi\u00e8re visible dans l\u2019oc\u00e9an et le d\u00e9veloppement d\u2019organismes marins sous la glace.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row type=\u00a0\u00bbin_container\u00a0\u00bb full_screen_row_position=\u00a0\u00bbmiddle\u00a0\u00bb column_margin=\u00a0\u00bbdefault\u00a0\u00bb column_direction=\u00a0\u00bbdefault\u00a0\u00bb column_direction_tablet=\u00a0\u00bbdefault\u00a0\u00bb column_direction_phone=\u00a0\u00bbdefault\u00a0\u00bb scene_position=\u00a0\u00bbcenter\u00a0\u00bb text_color=\u00a0\u00bbdark\u00a0\u00bb text_align=\u00a0\u00bbleft\u00a0\u00bb row_border_radius=\u00a0\u00bbnone\u00a0\u00bb row_border_radius_applies=\u00a0\u00bbbg\u00a0\u00bb overflow=\u00a0\u00bbvisible\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb shape_divider_position=\u00a0\u00bbbottom\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb][vc_column column_padding=\u00a0\u00bbno-extra-padding\u00a0\u00bb column_padding_tablet=\u00a0\u00bbinherit\u00a0\u00bb column_padding_phone=\u00a0\u00bbinherit\u00a0\u00bb column_padding_position=\u00a0\u00bball\u00a0\u00bb column_element_direction_desktop=\u00a0\u00bbdefault\u00a0\u00bb column_element_spacing=\u00a0\u00bbdefault\u00a0\u00bb desktop_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb tablet_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb phone_text_alignment=\u00a0\u00bbdefault\u00a0\u00bb background_color_opacity=\u00a0\u00bb1″ background_hover_color_opacity=\u00a0\u00bb1″ column_backdrop_filter=\u00a0\u00bbnone\u00a0\u00bb column_shadow=\u00a0\u00bbnone\u00a0\u00bb column_border_radius=\u00a0\u00bbnone\u00a0\u00bb column_link_target=\u00a0\u00bb_self\u00a0\u00bb column_position=\u00a0\u00bbdefault\u00a0\u00bb gradient_direction=\u00a0\u00bbleft_to_right\u00a0\u00bb overlay_strength=\u00a0\u00bb0.3″ width=\u00a0\u00bb1\/1″ tablet_width_inherit=\u00a0\u00bbdefault\u00a0\u00bb animation_type=\u00a0\u00bbdefault\u00a0\u00bb bg_image_animation=\u00a0\u00bbnone\u00a0\u00bb border_type=\u00a0\u00bbsimple\u00a0\u00bb column_border_width=\u00a0\u00bbnone\u00a0\u00bb column_border_style=\u00a0\u00bbsolid\u00a0\u00bb][nectar_global_section id=\u00a0\u00bb6550″][\/vc_column][\/vc_row]\n","protected":false},"excerpt":{"rendered":"

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