{"id":555,"date":"2013-12-13T08:49:00","date_gmt":"2013-12-13T07:49:00","guid":{"rendered":"https:\/\/kids.esa.int\/thinning_ice_and_rising_sea_levels\/"},"modified":"2026-10-08T00:29:35","modified_gmt":"2026-10-07T22:29:35","slug":"thinning_ice_and_rising_sea_levels","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/nb\/thinning_ice_and_rising_sea_levels\/","title":{"rendered":"Tynnere is og stigende havniv\u00e5"},"content":{"rendered":"
\n

Siden oppskytingen i april 2010 har ESAs romfart\u00f8y CryoSat fl\u00f8yet over Nord- og S\u00f8rpolen p\u00e5 v\u00e5r planet. Oppdraget best\u00e5r i \u00e5 observere endringer i tykkelsen p\u00e5 isen som dekker disse omr\u00e5dene.<\/p>\n

Etter tre \u00e5rs observasjoner har CryoSat bekreftet at isvolumet i Arktis (Nordpolen) er i ferd med \u00e5 avta. CryoSat har ogs\u00e5 vist at den vestantarktiske iskappen (S\u00f8rpolen) mister mer enn 150 kubikkilometer is hvert \u00e5r. Det tilsvarer en isblokk som er 1 km bred, 1 km dyp og 150 km lang!<\/p>\n<\/div>\n

De enorme isdekkene som dekker Jordens polaromr\u00e5der, er ikke permanente. De vokser i kaldere perioder, kjent som istider, og de krymper n\u00e5r temperaturene stiger eller lokale forhold endrer seg. Selv isdekket i Antarktis, som er nesten 3 km tykt, kan p\u00e5virkes.<\/p>\n

\"Change
Endring i isdekkets tykkelse per \u00e5r<\/figcaption><\/figure>\n

Vest-Antarktis opplever for tiden et raskt is tap. CryoSat har vist at det meste av dette skjer i isbreene som renner ut i Amundsenhavet. Isen blir tynnere i et tempo p\u00e5 hele 4\u20138 meter per \u00e5r der isbreene Pine Island, Thwaites og Smith l\u00f8sner fra land og begynner \u00e5 flyte ut over havet.<\/p>\n

Man antok tidligere at smeltingen i Vest-Antarktis hadde for\u00e5rsaket en global havniv\u00e5stigning p\u00e5 0,28 mm hvert \u00e5r mellom 2005 og 2010. Nye resultater fra CryoSat tyder imidlertid p\u00e5 at regionens bidrag til havniv\u00e5stigningen er enda st\u00f8rre! Dette kan enten skyldes at isen blir tynnere raskere enn forskerne tidligere antok, eller at CryoSat gir et mer n\u00f8yaktig bilde enn andre satellitter!<\/p>","protected":false},"excerpt":{"rendered":"

Since its launch in April 2010, ESA\u2019s CryoSat spacecraft has been flying over the North and South Poles of our planet. Its mission is to observe changes in the thickness […]<\/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\/2010\/01\/esa_s_ice_mission2\/17894573-2-eng-GB\/ESA_s_ice_mission.jpg","esa_banner_description":"ESA's ice mission","esa_banner_credit":"ESA\/AOES Medialab","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2010\/01\/ESA_s_ice_mission2","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-555","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\/nb\/wp-json\/wp\/v2\/posts\/555","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/comments?post=555"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/555\/revisions"}],"predecessor-version":[{"id":4547,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/555\/revisions\/4547"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/media?parent=555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/categories?post=555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/tags?post=555"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/panel?post=555"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/language?post=555"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/age?post=555"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/duration?post=555"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/resource_type?post=555"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/audience?post=555"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/wf_post_folders?post=555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}