{"id":904,"date":"2004-12-03T10:03:00","date_gmt":"2004-12-03T09:03:00","guid":{"rendered":"https:\/\/kids.esa.int\/ice_caps\/"},"modified":"2026-10-08T00:33:35","modified_gmt":"2026-10-07T22:33:35","slug":"ice_caps","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/ice_caps\/","title":{"rendered":"J\u00e4\u00e4tik\u00f6t"},"content":{"rendered":"<div class=\"lede\">\n<p>Maa on niin sanottu \u2018Goldilocks\u2019-planeetta. Se ei ole liian kuuma eik\u00e4 liian kylm\u00e4. T\u00e4m\u00e4n vuoksi maapallomme on ainoa tiedossamme oleva paikka, jossa vesi voi esiinty\u00e4 kaasuna, nesteen\u00e4 tai kiinte\u00e4n\u00e4 aineena (j\u00e4\u00e4n\u00e4).<\/p>\n<\/div>\n<p>Talvella kohtaamme yleens\u00e4 j\u00e4\u00e4t\u00e4, mutta navoilla ja korkeiden vuorten huipuilla j\u00e4\u00e4t\u00e4 on ymp\u00e4ri vuoden.<\/p>\n<p>Maan suurimmat j\u00e4\u00e4peitteet peitt\u00e4v\u00e4t Antarktiksen ja Gr\u00f6nlannin. My\u00f6s arktisella alueella on valtava j\u00e4\u00e4alue, mutta se on melko ohut ja kelluu meren pinnalla. J\u00e4\u00e4peitteet ja vuoristoj\u00e4\u00e4tik\u00f6t kasvavat tai kutistuvat usein. Nyky\u00e4\u00e4n monet tutkijat katsovat, ett\u00e4 ilmaston l\u00e4mpeneminen aiheuttaa j\u00e4\u00e4n sulamista ja merenpinnan nousua, mik\u00e4 lis\u00e4\u00e4 tulvavaaran.<\/p>\n<p>Pitk\u00e4ll\u00e4 aikav\u00e4lill\u00e4 esimerkiksi ESA:n ERS- ja Envisat-satelliiteista saatavat tiedot antavat meille k\u00e4sityksen siit\u00e4, mit\u00e4 on tapahtumassa.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"341\" data-credit=\"AP Photo\/Rachel D&#x27;Oro\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/12\/antactica_012\" 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\/2004\/12\/antactica_012\/17876220-2-eng-GB\/antactica_01.jpg\" alt=\"\"><\/figure>\n<p>Avaruudesta otetut kuvat osoittavat j\u00e4\u00e4peitteiden hajoamisen ja j\u00e4\u00e4vuorien liikkumisen. Niiden avulla havaitaan my\u00f6s meren l\u00e4mp\u00f6tilan ja v\u00e4rin muutoksia. Tutkalaitteet osoittavat j\u00e4\u00e4n paksuuden ja maailmanlaajuisen merenpinnan tason muutoksia. Lis\u00e4ksi ne auttavat aluksia purjehtimaan turvallisesti j\u00e4\u00e4peitteiden l\u00e4pi talvella.<\/p>","protected":false},"excerpt":{"rendered":"<p>Earth is the &#8216;Goldilocks&#8217; planet. It is neither too hot nor too cold. As a result, our world is the only place we know where water can take the form [&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\/2004\/12\/antarctica3\/17874407-2-eng-GB\/antarctica.jpg","esa_banner_description":"","esa_banner_credit":"AP Photo\/Al Grillo","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/12\/antarctica3","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[42,10,66],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-904","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-water-world","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/904","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=904"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/904\/revisions"}],"predecessor-version":[{"id":4732,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/904\/revisions\/4732"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=904"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=904"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=904"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=904"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=904"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=904"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=904"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=904"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=904"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=904"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}