{"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\/fi\/cryosat_esa_s_eye_on_earth_s_ice\/","title":{"rendered":"CryoSat \u2013 ESA:n silm\u00e4 maapallon j\u00e4\u00e4ll\u00e4"},"content":{"rendered":"<div class=\"lede\">\n<p>ESA on aikeissa laukaista avaruuteen kaikkien aikojen edistyneimm\u00e4n satelliitin, jonka teht\u00e4v\u00e4n\u00e4 on mitata maapallon j\u00e4\u00e4peitett\u00e4. CryoSat-projekti on her\u00e4nnyt henkiin sen j\u00e4lkeen, kun ensimm\u00e4inen satelliitti menetettiin laukaisuraketin vian seurauksena lokakuussa 2005. Nyt uusi ja paranneltu CryoSat-2 on valmis laukaisuun 8. huhtikuuta. Se sijoitetaan polaarikiertoradalle 700 km:n korkeuteen maanpinnasta ven\u00e4l\u00e4isell\u00e4 Dnepr-raketilla, joka laukaistaan Baikonurin avaruuskeskuksesta Kazakstanista.<\/p>\n<\/div>\n<p>J\u00e4\u00e4peitett\u00e4 on kartoitettu avaruudesta jo vuosien ajan esimerkiksi Envisat-satelliittien avulla. Viimeaikaiset enn\u00e4tyksellisen pienet kes\u00e4iset arktisen merij\u00e4\u00e4n peitt\u00e4m\u00e4 pinta-ala osoittavat, ett\u00e4 maailman pohjoisosassa on meneill\u00e4\u00e4n merkitt\u00e4vi\u00e4 muutoksia. T\u00e4m\u00e4 ei kuitenkaan kerro koko totuutta siit\u00e4, miten ilmastonmuutos saattaa vaikuttaa napa-alueisiin. Tutkijat ovat kiinnostuneita selvitt\u00e4m\u00e4\u00e4n my\u00f6s, miten j\u00e4\u00e4n paksuus muuttuu. Maalla sijaitsevat j\u00e4\u00e4peitteet ovat useita kilometrej\u00e4 paksuja. Jos ne alkavat kadota, merenpinta voi nousta huomattavasti, mik\u00e4 voi aiheuttaa tulvia rannikkoalueilla, my\u00f6s suurkaupungeissa.<\/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 on ihanteellinen j\u00e4\u00e4n tarkkailija. Siin\u00e4 on s\u00e4\u00e4olosuhteista riippumaton mikroaaltoradarlaite, joka havaitsee j\u00e4\u00e4n pinnasta heijastuvat lyhyiden tutkapulssien kaiut. Laitteella voidaan mitata eritt\u00e4in tarkasti polaarisilla merill\u00e4 kelluvan j\u00e4\u00e4n paksuuden vaihteluita. Se seuraa my\u00f6s tarkasti Gr\u00f6nlannin ja Antarktiksen peitt\u00e4vi\u00e4 valtavia j\u00e4\u00e4peitteit\u00e4. Seuraavien kolmen\u2013viiden vuoden aikana satelliitti havaitsee jopa yhden senttimetrin vuosittaiset muutokset.<\/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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