{"id":892,"date":"2007-09-21T10:08:00","date_gmt":"2007-09-21T08:08:00","guid":{"rendered":"https:\/\/kids.esa.int\/disappearing_arctic_ice\/"},"modified":"2026-10-08T00:33:27","modified_gmt":"2026-10-07T22:33:27","slug":"disappearing_arctic_ice","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/disappearing_arctic_ice\/","title":{"rendered":"Arktisen j\u00e4\u00e4n katoaminen"},"content":{"rendered":"<div class=\"lede\">\n<p>Jo yli 500 vuoden ajan merenkulkijat ovat etsineet j\u00e4\u00e4tt\u00f6m\u00e4\u00e4 reitti\u00e4 Kanadan pohjoisosan arktisten saarten v\u00e4lilt\u00e4. Monet tutkimusmatkailijat menettiv\u00e4t henkens\u00e4 etsiess\u00e4\u00e4n Luoteisv\u00e4yl\u00e4\u00e4, joka yhdist\u00e4isi Atlantin ja Tyynenmeren. Arktinen j\u00e4\u00e4peite on kuitenkin alkanut kutistua nopeasti. ESAn Envisat-satelliitin ottamat uudet tutkakuvat osoittavat, ett\u00e4 arktisen merij\u00e4\u00e4n pinta-ala on nyt pienimmill\u00e4\u00e4n sitten satelliittimittausten alkamisen l\u00e4hes 30 vuotta sitten. T\u00e4m\u00e4n seurauksena aiemmin kulkukelvoton Luoteisv\u00e4yl\u00e4 on v\u00e4liaikaisesti avautunut.<\/p>\n<\/div>\n<p>Arktinen j\u00e4\u00e4peite kasvaa pohjoisen talven aikana ja pienenee joka pohjoinen kes\u00e4. Kes\u00e4n aikana tapahtuvan sulamisen vauhti on kuitenkin kiihtym\u00e4ss\u00e4. Envisat-satelliitin syyskuussa 2007 ottamista l\u00e4hes 200 kuvasta koostuva mosaiikki osoitti, ett\u00e4 Luoteisv\u00e4yl\u00e4 oli t\u00e4ysin purjehduskelpoinen, kun taas Siperian rannikkoa pitkin kulkeva Koillisv\u00e4yl\u00e4 oli vain osittain tukossa.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1186\" data-credit=\"ESA\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/09\/A_2007_ice-free_portion_of_the_Northwest_Passage2\" 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\/2007\/09\/a_2007_ice-free_portion_of_the_northwest_passage2\/17885582-2-eng-GB\/A_2007_ice-free_portion_of_the_Northwest_Passage.jpg\" alt=\"A 2007 ice-free portion of the Northwest Passage\"><figcaption>Vuoden 2007 j\u00e4\u00e4tt\u00f6m\u00e4 osa Luoteisv\u00e4yl\u00e4st\u00e4<\/figcaption><\/figure>\n<p>Tanskalainen tutkija Leif Toudal Pedersen sanoi: \u201cOlemme havainneet, ett\u00e4 j\u00e4\u00e4peitteen pinta-ala on supistunut vain noin 3 miljoonaan neli\u00f6kilometriin, mik\u00e4 on noin 1 miljoona neli\u00f6kilometri\u00e4 v\u00e4hemm\u00e4n kuin vuosina 2005 ja 2006. J\u00e4\u00e4peitteen pinta-ala on pienentynyt viimeisten 10 vuoden aikana keskim\u00e4\u00e4rin noin 100 000 neli\u00f6kilometri\u00e4 vuodessa, joten 1 miljoonan neli\u00f6kilometrin lasku vain yhden vuoden aikana on \u00e4\u00e4rimm\u00e4isen suuri.\u201d<\/p>","protected":false},"excerpt":{"rendered":"<p>For more than 500 years, navigators have been seeking an ice-free route between the Arctic islands of northern Canada. Many explorers died in the quest to find a Northwest Passage [&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\/2007\/09\/2007_envisat_mosaic_of_arctic_ocean2\/17878848-2-eng-GB\/2007_Envisat_mosaic_of_Arctic_Ocean.jpg","esa_banner_description":"2007 Envisat mosaic of Arctic Ocean","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/09\/2007_Envisat_mosaic_of_Arctic_Ocean2","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":[64,42,10],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-892","post","type-post","status-publish","format-standard","hentry","category-climate-change","category-earth","category-learn"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/892","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=892"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/892\/revisions"}],"predecessor-version":[{"id":4724,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/892\/revisions\/4724"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=892"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=892"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=892"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=892"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=892"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=892"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=892"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=892"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=892"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}