{"id":878,"date":"2005-09-09T13:37:00","date_gmt":"2005-09-09T11:37:00","guid":{"rendered":"https:\/\/kids.esa.int\/cryosat_europe_s_ice_explorer\/"},"modified":"2026-10-08T00:33:18","modified_gmt":"2026-10-07T22:33:18","slug":"cryosat_europe_s_ice_explorer","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/cryosat_europe_s_ice_explorer\/","title":{"rendered":"Cryosat: Euroopan j\u00e4\u00e4tutkimusalus"},"content":{"rendered":"
\n

Suurin osa tutkijoista on yht\u00e4 mielt\u00e4 siit\u00e4, ett\u00e4 maapallomme l\u00e4mpenee. T\u00e4m\u00e4n vuosisadan ensimm\u00e4iset 10 vuotta olivat mittaushistorian l\u00e4mpimin vuosikymmen. T\u00e4m\u00e4 aiheuttaa todenn\u00e4k\u00f6isesti merkitt\u00e4vi\u00e4 muutoksia Euroopan ilmastoon. Ent\u00e4p\u00e4 napaj\u00e4\u00e4tik\u00f6t? Sulavatko ne? Jos sulavat, millainen vaikutus t\u00e4ll\u00e4 on maailman ilmastoon ja merenpinnan korkeuteen?<\/p>\n<\/div>\n

Er\u00e4s eurooppalainen satelliitti tarjoaa nyt joitakin vastauksia. 8. huhtikuuta 2010 laukaisun saanut Cryosat lent\u00e4\u00e4 napojen yl\u00e4puolella 720 km:n korkeudessa.<\/p>\n

Cryosat mittaa huipputeknologian mukaisella tutkalaitteella j\u00e4\u00e4paksuuden pienimpi\u00e4kin muutoksia l\u00e4hett\u00e4m\u00e4ll\u00e4 radiosignaaleja pinnasta ja vastaanottamalla niiden kaikuja. Jos kaikuja palaa takaisin nopeammin, j\u00e4\u00e4pinnan on oltava korkeammalla.<\/p>\n

Cryosat pystyy havaitsemaan alle 2 cm:n vuosittaiset muutokset J\u00e4\u00e4merell\u00e4 kelluvan j\u00e4\u00e4n korkeudessa. Antarktiksen mantereen valtavien j\u00e4\u00e4peitteiden p\u00e4\u00e4ll\u00e4 se pystyy mittaamaan alle 2 mm:n vuosittaisia muutoksia.<\/p>\n

N\u00e4iden tulosten avulla tutkijat voivat selvitt\u00e4\u00e4, onko arktinen merij\u00e4\u00e4 hajoamassa ja sulamassa. Ne osoittavat my\u00f6s, ovatko Etel\u00e4mantereen maamassan ja sit\u00e4 ymp\u00e4r\u00f6iv\u00e4n meren peitt\u00e4v\u00e4t j\u00e4\u00e4peitteet kutistumassa vai kasvamassa. T\u00e4m\u00e4 on t\u00e4rke\u00e4\u00e4, sill\u00e4 merenpinta voi nousta useita metrej\u00e4, jos j\u00e4\u00e4peitteet sulavat. T\u00e4ll\u00f6in monet matalalla sijaitsevat kaupungit ja maat saattaisivat joutua tulvien alle.<\/p>\n

CryoSat on kolmas Earth Explorer -luotain, joka laukaistaan osana ESA:n Living Planet -ohjelmaa (GOCE:n, ESA:n painovoimaluotaimen, ja SMOS:n, ESA:n vesiluotaimen, j\u00e4lkeen).<\/p>","protected":false},"excerpt":{"rendered":"

Most scientists agree that our planet is getting warmer. The first 10 years of this century were the warmest decade on record. This is likely to cause important changes to […]<\/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\/2005\/06\/artist_s_impression_of_cryosat_in_orbit2\/17878071-2-eng-GB\/Artist_s_impression_of_CryoSat_in_orbit.jpg","esa_banner_description":"Artist's impression of CryoSat in orbit","esa_banner_credit":"ESA\/AOES Medialab","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2005\/06\/Artist_s_impression_of_CryoSat_in_orbit2","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-878","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\/878","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=878"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/878\/revisions"}],"predecessor-version":[{"id":2021,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/878\/revisions\/2021"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=878"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=878"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=878"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=878"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=878"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=878"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=878"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=878"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=878"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=878"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}