{"id":1017,"date":"2010-02-18T14:27:00","date_gmt":"2010-02-18T13:27:00","guid":{"rendered":"https:\/\/kids.esa.int\/cryosat_esa_s_eye_on_earth_s_ice\/"},"modified":"2026-10-08T00:34:55","modified_gmt":"2026-10-07T22:34:55","slug":"cryosat_esa_s_eye_on_earth_s_ice","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/cryosat_esa_s_eye_on_earth_s_ice\/","title":{"rendered":"CryoSat \u2013 L\u2019\u0153il de l\u2019ESA sur les glaces de la Terre"},"content":{"rendered":"<div class=\"lede\">\n<p>L\u2019ESA s\u2019appr\u00eate \u00e0 lancer le satellite le plus complexe jamais r\u00e9alis\u00e9 pour mesurer la couverture de glace de notre plan\u00e8te. La mission CryoSat reprend vie apr\u00e8s l\u2019\u00e9chec du lancement et la perte du premier satellite du nom en octobre 2005. Revu et am\u00e9lior\u00e9, le nouveau CryoSat-2 est pr\u00eat pour le lacement programm\u00e9 le 8 avril. Il sera plac\u00e9 en orbite polaire \u00e0 700 km au-dessus de la Terre par un lanceur russe Dnepr, depuis le cosmodrome de Ba\u00efkonour au Kazakhstan.<\/p>\n<\/div>\n<p>Des satellites comme Envisat cartographient d\u00e9j\u00e0 depuis de nombreuses ann\u00e9es la couverture glaciaire de la Terre. Les records de recul des glaces enregistr\u00e9s en \u00e9t\u00e9 dans la r\u00e9gion couverte par la glace de la mer Arctique montrent que des changements significatifs sont \u00e0 l'\u0153uvre au sommet du globe. Cela ne nous dit toutefois pas tout sur l\u2019influence du changement climatique sur les r\u00e9gions polaires. Les scientifiques souhaitent \u00e9galement conna\u00eetre l\u2019\u00e9volution de l'\u00e9paisseur de la glace. Les calottes glaciaires qui couvrent les terres mesurent plusieurs kilom\u00e8tres d\u2019\u00e9paisseur. Leur diminution pourrait entra\u00eener une hausse importante du niveau de la mer et d\u00e9terminer l\u2019inondation de zones c\u00f4ti\u00e8res et de villes importantes.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"4647\" data-credit=\"ESA\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2010\/01\/Canadian_Arctic_and_Greenland_as_seen_by_Envisat2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2010\/01\/canadian_arctic_and_greenland_as_seen_by_envisat2\/17912740-2-eng-GB\/Canadian_Arctic_and_Greenland_as_seen_by_Envisat.jpg\" alt=\"Canadian Arctic and Greenland as seen by Envisat\"><\/figure>\n<p>CryoSat est id\u00e9al pour observer la glace. Ce satellite emporte un instrument radar tous-temps qui r\u00e9ceptionne les \u00e9chos de br\u00e8ves impulsions radar r\u00e9fl\u00e9chies par la surface de la glace. Cet instrument est capable de mesurer avec une grande pr\u00e9cision toutes les variations d\u2019\u00e9paisseur de la glace qui flotte sur les oc\u00e9ans polaires. Il observera aussi de pr\u00e8s les vastes calottes glaciaires qui recouvrent le Groenland et l\u2019Antarctique. Pendant les trois \u00e0 cinq ann\u00e9es \u00e0 venir, il d\u00e9tectera les changements avec une pr\u00e9cision de l'ordre du centim\u00e8tre.<\/p>","protected":false},"excerpt":{"rendered":"<p>ESA is about to launch the most advanced satellite ever to measure Earth\u2019s ice cover. The CryoSat mission has come back from the dead after the first satellite was lost [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2009\/09\/cryosat2\/17868562-2-eng-GB\/CryoSat.jpg","esa_banner_description":"CryoSat","esa_banner_credit":"ESA\/P. 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