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background_hover_color_opacity=\u00a0\u00bb1&Prime; 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&Prime; width=\u00a0\u00bb5\/6&Prime; 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<h2><span style=\"color: #ff6b1a;\">L&rsquo;ATMOSPH\u00c8RE ANTARCTIQUE<\/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&Prime; 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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&Prime; background_hover_color_opacity=\u00a0\u00bb1&Prime; 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&Prime; width=\u00a0\u00bb1\/3&Prime; 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]<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-9372\" src=\"https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/03\/ATMO_01-300x120.png\" alt=\"\" width=\"300\" height=\"120\" srcset=\"https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/03\/ATMO_01-300x120.png 300w, https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/03\/ATMO_01.png 376w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>[\/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&Prime; background_hover_color_opacity=\u00a0\u00bb1&Prime; 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&Prime; width=\u00a0\u00bb2\/3&Prime; 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]Quelle belle surprise que d\u2019apercevoir au hasard des ciels nocturnes polaires, les fascinantes lueurs mouvantes des aurores polaires qui s&rsquo;\u00e9panouissent, ondulent et s&rsquo;\u00e9vanouissent dans le firmament, au rythme des flux de particules et des bouff\u00e9es magn\u00e9tiques qui nous viennent du soleil. Peut-\u00eatre les membres de l&rsquo;exp\u00e9dition seront-ils t\u00e9moins, sur les c\u00f4tes antarctiques, de halos iris\u00e9s qui font exploser la lumi\u00e8re solaire, ou de quelques mirages qui font na\u00eetre d&rsquo;imaginaires paysages dans le ciel polaire.[\/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&Prime; background_hover_color_opacity=\u00a0\u00bb1&Prime; 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&Prime; width=\u00a0\u00bb1\/1&Prime; 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<h2><span style=\"color: #ff6b1a;\">CE QU&rsquo;IL FAUT SAVOIR :<\/span><\/h2>\n<p><strong>Avez-vous d\u00e9j\u00e0 entendu parler du trou de la couche d\u2019ozone\u00a0?<\/strong> Ce \u00ab trou \u00bb, appara\u00eet au printemps dans l&rsquo;ozone atmosph\u00e9rique antarctique. L&rsquo;ozone est un gaz dont les mol\u00e9cules sont constitu\u00e9es par 3 atomes d&rsquo;oxyg\u00e8ne. Il est pr\u00e9sent en tr\u00e8s faible quantit\u00e9 dans les hautes couches de l&rsquo;atmosph\u00e8re (stratosph\u00e8re) et est r\u00e9parti essentiellement entre 10 et 20 km d&rsquo;altitude. S&rsquo;il \u00e9tait uniform\u00e9ment rassembl\u00e9 au niveau de la mer, ce gaz ne formerait pas une couche sup\u00e9rieure \u00e0 3 mm. Si, t\u00e9nue soit-elle, cette quantit\u00e9 d&rsquo;ozone arr\u00eate une partie des rayons ultra-violets \u00e9mis par le soleil, dangereux pour les \u00eatres vivants (alt\u00e9ration du code g\u00e9n\u00e9tique, cancers de la peau, cataracte&#8230;). Malheureusement, des ann\u00e9es 1980 \u00e0 1990, le taux d&rsquo;ozone stratosph\u00e9rique a diminu\u00e9 de moiti\u00e9 au-dessus de l&rsquo;Antarctique. Cette disparition \u00e9tait due au rejet de gaz appel\u00e9s CFC (Chloro-fluoro-carbones) contenus dans les bombes a\u00e9rosols et dans les r\u00e9frig\u00e9rateurs qui ont ensuite \u00e9t\u00e9 interdits par le protocole de Montr\u00e9al en 1987. Ces CFC, totalement inoffensifs au niveau du sol, montent dans la stratosph\u00e8re, se r\u00e9partissent autour de la Terre et sont d\u00e9truits par les ultra-violets en lib\u00e9rant du chlore actif. Une succession complexe de r\u00e9actions chimiques m\u00e8ne \u00e0 la destruction de l&rsquo;ozone par le chlore. Mais pourquoi au-dessus de l&rsquo;Antarctique ? Parce que, pendant la longue nuit d&rsquo;hiver, l&rsquo;air polaire est isol\u00e9 et priv\u00e9 d&rsquo;un apport d&rsquo;ozone \u00e9quatorial ; de plus, le froid, intense en altitude (-90 \u00b0C), favorise la lib\u00e9ration de chlore au niveau des cristaux de glace pr\u00e9sents dans le ciel hivernal antarctique (nuages stratosph\u00e9riques). La lumi\u00e8re du printemps d\u00e9clenche la destruction de l&rsquo;ozone polaire par le chlore. Des lasers particuliers appel\u00e9s Lidars, permettent de mesurer l&rsquo;ozone au-dessus de la Terre Ad\u00e9lie. La d\u00e9perdition en ozone au-dessus de l\u2019Antarctique a atteint une superficie de 24 millions de km2 en 2014, le record datant de 2000 avec 29,9 millions de km2. Actuellement, le trou dans la couche d\u2019ozone est plus petit que durant la p\u00e9riode 1998-2006. En 2022, sa superficie \u00e9tait de 23,2 millions de km2.[\/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&Prime; background_hover_color_opacity=\u00a0\u00bb1&Prime; 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&Prime; width=\u00a0\u00bb2\/3&Prime; 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]<strong>L&rsquo;effet de serre<\/strong> est d\u00fb \u00e0 la pr\u00e9sence de certains gaz (gaz carbonique, m\u00e9thane, oxyde d&rsquo;azote, vapeur d&rsquo;eau&#8230;)dans l&rsquo;atmosph\u00e8re. Cet effet est totalement naturel et nous permet d\u2019enregistrer sur notre Terre une temp\u00e9rature moyenne de +15\u00b0C, mais qui serait de -18\u00b0C sans effet de serre. Pourtant, \u00e0 travers nos activit\u00e9s humaines, nous rajoutons en permanence des gaz \u00e0 effet de serre dans l\u2019atmosph\u00e8re et avons ainsi, depuis la r\u00e9volution industrielle, augment\u00e9 la temp\u00e9rature de notre plan\u00e8te de +1,2\u00b0C. Cet effet de serre est li\u00e9 \u00e0 l\u2019absorption des rayons infra-rouge (li\u00e9s \u00e0 la temp\u00e9rature d\u2019un corps, ici la surface de la Terre chauff\u00e9e par le soleil) par ces gaz et la r\u00e9\u00e9mission dans l\u2019atmosph\u00e8re. On peut imaginer donc que l\u2019atmosph\u00e8re joue le r\u00f4le d\u2019une couverture qui s\u2019\u00e9paissirait autour de la Terre et lui donnerait plus chaud. Cette augmentation de la temp\u00e9rature entra\u00eene une fonte partielle des glaces, une augmentation du niveau marin, une amplification du cycle de l\u2019eau et des \u00e9v\u00e8nements extr\u00eames (inondations, p\u00e9riodes de s\u00e9cheresse etc\u2026). Le futur de notre climat et des r\u00e9gions polaires d\u00e9pend maintenant des mesures que nous prendrons (ou non) pour faire \u00e9voluer ces \u00e9missions qui sont de plus en plus importantes chaque ann\u00e9e.[\/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&Prime; background_hover_color_opacity=\u00a0\u00bb1&Prime; 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&Prime; width=\u00a0\u00bb1\/3&Prime; 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]<img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-9373 aligncenter\" src=\"https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/03\/ATMO02-300x295.png\" alt=\"\" width=\"300\" height=\"295\" srcset=\"https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/03\/ATMO02-300x295.png 300w, https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/03\/ATMO02.png 764w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><em>Figure 1: Sch\u00e9ma de fonctionnement de l&rsquo;effet de serre. \u00a9 Office for Climate Education<\/em>[\/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&Prime; background_hover_color_opacity=\u00a0\u00bb1&Prime; 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&Prime; width=\u00a0\u00bb1\/3&Prime; 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]<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-9374\" src=\"https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/03\/ATMO03-271x300.png\" alt=\"\" width=\"271\" height=\"300\" srcset=\"https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/03\/ATMO03-271x300.png 271w, https:\/\/www.polarpod.fr\/wp-content\/uploads\/2026\/03\/ATMO03.png 521w\" sizes=\"auto, (max-width: 271px) 100vw, 271px\" \/>[\/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&Prime; background_hover_color_opacity=\u00a0\u00bb1&Prime; 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&Prime; width=\u00a0\u00bb2\/3&Prime; 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]Les mirages n\u2019existent pas que dans les d\u00e9serts chauds ! Quelques ph\u00e9nom\u00e8nes particuliers naissent \u00e9galement dans l&rsquo;atmosph\u00e8re antarctique. Dans les conditions de grand froid, l&rsquo;inversion des temp\u00e9ratures pr\u00e8s du sol d\u00e9vie le trajet des rayons lumineux qui ainsi forment des mirages au-dessus de l&rsquo;horizon. Les cristaux de glace en suspens dans l&rsquo;air et les nuages donnent aussi lieu \u00e0 de magnifiques jeux de lumi\u00e8re : des halos iris\u00e9s autour du soleil (parh\u00e9lie, et m\u00eame de \u00ab faux soleils \u00bb ). Des ph\u00e9nom\u00e8nes identiques peuvent se produire autour de la lune. Mais le spectacle des nuits antarctiques est, par excellence, l&rsquo;apparition d&rsquo;une aurore australe. Sans aucun lien avec la naissance du jour, ces lueurs changeantes qui illuminent le ciel nocturne des hautes latitudes trouvent leur origine dans les particules \u00e9lectris\u00e9es \u00e9ject\u00e9es dans l&rsquo;espace par le soleil (vent solaire arrivant au niveau de la Terre, \u00e0 quelque 500 km\/s) et qui, guid\u00e9es jusque dans la haute atmosph\u00e8re australe et bor\u00e9ale par le champ magn\u00e9tique terrestre, ionisent l&rsquo;air sur leur passage, entre 100 et 1000 km d&rsquo;altitude (les couleurs de la lumi\u00e8re \u00e9mise d\u00e9pendent des atomes ionis\u00e9s, par exemple rouge et vert pour l&rsquo;oxyg\u00e8ne). Dans la haute atmosph\u00e8re, ces particules \u00e9lectris\u00e9es qui entourent notre plan\u00e8te guident les ondes \u00e9lectromagn\u00e9tiques radio et permettent les t\u00e9l\u00e9communications, que les orages magn\u00e9tiques auroraux peuvent grandement perturber.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner 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 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&Prime; background_hover_color_opacity=\u00a0\u00bb1&Prime; 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&Prime; width=\u00a0\u00bb1\/1&Prime; 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<div id=\"propositions-d-activites\" class=\"pt-header\">\n<h3 class=\"text-primary\">Propositions d\u2019activit\u00e9s:<\/h3>\n<div id=\"propositions-d-activites\" class=\"pt-header\">\n<p><strong>L&rsquo;atmosph\u00e8re antarctique<\/strong><\/p>\n<ul>\n<li>En quoi l&rsquo;effet de serre concerne-t-il l&rsquo;Antarctique ?<\/li>\n<li>Est-ce que vous pouvez imaginer une exp\u00e9rience avec quelques saladiers et des lampes de bureau pour recr\u00e9er l\u2019effet de serre ?<\/li>\n<li>Pourquoi l\u2019Antarctique est-elle la zone du globe o\u00f9 la couche d\u2019ozone est la plus fragile ?<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div id=\"pour-plus-de-details\" class=\"pt-header\">\n<h3 class=\"text-primary\"><i class=\"icon icon-pp-add\"><\/i>\u00a0Pour plus de d\u00e9tails :<\/h3>\n<p>Livres\u00a0:<\/p>\n<ul>\n<li>Atmosph\u00e8re \u2013 D. Hauglustaine, J. Jouzel, V. Masson-Delmotte<\/li>\n<li>Atmosph\u00e8re, oc\u00e9an et climat \u2013 R. Delmas, S. Chauzy, JM. Verstraete, H. Ferr\u00e9<\/li>\n<\/ul>\n<p>Divers :<\/p>\n<ul>\n<li>Animation \u00e9volution du trou de la couche d\u2019ozone, <a href=\"https:\/\/web.archive.org\/web\/20240914095139\/https:\/\/www.youtube.com\/watch?v=2TmQ-iHdPZQ\">ici<\/a><\/li>\n<li>Ressources p\u00e9dagogiques de l\u2019Office for Climate Education : <a href=\"https:\/\/web.archive.org\/web\/20240914095139\/https:\/\/www.oce.global\/fr\/ressources\">oce.global<\/a><\/li>\n<\/ul>\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&Prime; 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