{"id":987,"date":"2006-02-27T10:08:00","date_gmt":"2006-02-27T09:08:00","guid":{"rendered":"https:\/\/kids.esa.int\/greenland_s_melting_glaciers\/"},"modified":"2026-10-08T00:34:33","modified_gmt":"2026-10-07T22:34:33","slug":"greenland_s_melting_glaciers","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/greenland_s_melting_glaciers\/","title":{"rendered":"Gr\u00f6nlannin sulavat j\u00e4\u00e4tik\u00f6t"},"content":{"rendered":"
\n

Nimest\u00e4\u00e4n huolimatta Gr\u00f6nlanti on l\u00e4hes kokonaan valtavan j\u00e4\u00e4peitteen peitossa. Useiden ESA:n satelliittien tuottamat tiedot viittaavat kuitenkin siihen, ett\u00e4 t\u00e4m\u00e4 valkoinen peite sulaa odotettua nopeammin.<\/p>\n<\/div>\n

Tuorein tutkimus Gr\u00f6nlannin j\u00e4\u00e4tik\u00f6ist\u00e4 perustuu tietoihin, jotka nelj\u00e4 maata kiert\u00e4v\u00e4\u00e4 satelliittia ker\u00e4si vuosina 1996\u20132005. ESAn eurooppalaiset kaukokartoitussatelliitit ERS-1 ja ERS-2, ESAn Envisat sek\u00e4 Kanadan Radarsat-1 on kaikki varustettu tutkalaitteilla, joilla voidaan tarkkailla maanpintaa p\u00e4iv\u00e4ll\u00e4 ja y\u00f6ll\u00e4, jopa tihe\u00e4n pilvipeitteen alla.<\/p>\n

Erityisesti NASA:n Jet Propulsion Laboratoryn Eric Rignot ja Kansasin yliopiston tutkija Pannir Kanagaratnam olivat kiinnostuneita mittaamaan Gr\u00f6nlannin j\u00e4\u00e4peitteen korkeuden muutoksia.<\/p>\n

\"Envisat
Envisat-kuva Rinks Isbrae -j\u00e4\u00e4tik\u00f6st\u00e4, Gr\u00f6nlanti<\/figcaption><\/figure>\n

Satelliittitietojen perusteella tutkijat havaitsivat, ett\u00e4 Etel\u00e4- ja Keski-Gr\u00f6nlannin j\u00e4\u00e4tik\u00f6t virtaavat entist\u00e4 nopeammin kohti merta. Ilmaston l\u00e4mpenemisen my\u00f6t\u00e4 n\u00e4iden j\u00e4\u00e4tik\u00f6iden Atlantin valtamereen laskeman j\u00e4\u00e4n m\u00e4\u00e4r\u00e4 on kaksinkertaistunut viimeisten 10 vuoden aikana. Tutkijoiden laskelmien mukaan Gr\u00f6nlanti vaikuttaa noin 0,5 mm vuodessa maailmanlaajuiseen merenpinnan nousuun, joka on noin 2,5 mm vuodessa.<\/p>\n

Tulevissa tutkimuksissa, joissa hy\u00f6dynnet\u00e4\u00e4n Envisat- ja ERS-kaltaisia satelliitteja, saadaan t\u00e4rke\u00e4\u00e4 tietoa siit\u00e4, miten j\u00e4\u00e4peite ja merenpinta muuttuvat pitk\u00e4ll\u00e4 aikav\u00e4lill\u00e4.<\/p>\n

Gr\u00f6nlanti on maailman suurin saari. Sen j\u00e4\u00e4peite kattaa l\u00e4hes 2 miljoonaa neli\u00f6kilometri\u00e4, ja sen keskim\u00e4\u00e4r\u00e4inen paksuus on 2,3 kilometri\u00e4. Jos kaikki j\u00e4\u00e4 sulaisi, maailman merenpinta nousisi jopa seitsem\u00e4n metri\u00e4.<\/p>","protected":false},"excerpt":{"rendered":"

Despite its name, Greenland is almost entirely covered by a huge sheet of ice. However, data from several ESA satellites suggest that this white blanket is melting faster than expected. […]<\/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\/2006\/02\/envisat_image_of_south_greenland2\/17899607-2-eng-GB\/Envisat_image_of_South_Greenland.jpg","esa_banner_description":"Envisat image of South Greenland","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2006\/02\/Envisat_image_of_South_Greenland2","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":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-987","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-water-world"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/987","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=987"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/987\/revisions"}],"predecessor-version":[{"id":4779,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/987\/revisions\/4779"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=987"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=987"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=987"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=987"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=987"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=987"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=987"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=987"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=987"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=987"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}