{"id":935,"date":"2004-12-03T09:37:00","date_gmt":"2004-12-03T08:37:00","guid":{"rendered":"https:\/\/kids.esa.int\/lakes\/"},"modified":"2026-10-08T00:33:57","modified_gmt":"2026-10-07T22:33:57","slug":"lakes","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/sv\/lakes\/","title":{"rendered":"Sj\u00f6ar"},"content":{"rendered":"
\n

Sj\u00f6ar \u00e4r v\u00e4rdefulla k\u00e4llor till vatten och mat, s\u00e4rskilt i fattiga l\u00e4nder. De skadas dock l\u00e4tt av \u00f6verutnyttjande, f\u00f6roreningar och klimatf\u00f6r\u00e4ndringar. F\u00f6r\u00e4ndringar i sj\u00f6arnas storlek och strandlinjer syns tydligt fr\u00e5n rymden.<\/p>\n<\/div>\n

S\u00e5dan information \u00e4r mycket v\u00e4rdefull i avl\u00e4gsna omr\u00e5den och fattiga l\u00e4nder. Den visar hur vattenniv\u00e5erna p\u00e5verkas av jordbruk och v\u00e4der. Den varnar ocks\u00e5 m\u00e4nniskor som bor i n\u00e4rheten f\u00f6r \u00f6versv\u00e4mningar.<\/p>\n

Satelliter ger ocks\u00e5 viktig information om sj\u00f6arnas tillst\u00e5nd, bland annat om vattentemperatur, f\u00e4rg och f\u00f6roreningar.<\/p>\n

Ett av de mest dramatiska exemplen \u00e4r Aralsj\u00f6n i Kazakstan. Den var en g\u00e5ng v\u00e4rldens fj\u00e4rde st\u00f6rsta sj\u00f6, men har under de senaste 45 \u00e5ren krympt till mindre \u00e4n h\u00e4lften av sin ursprungliga storlek.
Bilder fr\u00e5n satelliter, s\u00e5som ESA:s Envisat, visar hur m\u00e4nsklig verksamhet har f\u00e5tt floderna som rinner ut i Aralsj\u00f6n att minska till en liten str\u00f6m. Som en f\u00f6ljd av detta har sj\u00f6n faktiskt delats i tv\u00e5 delar. Runt dess kanter finns nu en 40 000 kvadratkilometer stor \u00f6ken av vit, salt jord.<\/p>\n

Radarinstrument i rymden kan ocks\u00e5 m\u00e4ta f\u00f6r\u00e4ndringar i vattenniv\u00e5n i sj\u00f6ar och de floder som mynnar ut i dem. I st\u00f6rre delen av Aralsj\u00f6n har vattenniv\u00e5n sjunkit med 14 meter sedan 1960-talet. Insatserna f\u00f6r att h\u00f6ja vattenniv\u00e5n och minska salthalten i sj\u00f6ns norra del har dock gett vissa resultat under de senaste \u00e5ren.<\/p>","protected":false},"excerpt":{"rendered":"

Lakes are valuable sources of water and food, particularly in poor countries. However, they are easily damaged by overuse, pollution and climate change. Changes in the sizes and shorelines of […]<\/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\/2003\/07\/the_shrinking_aral_sea_seen_from_envisat_s_meris2\/17873002-2-eng-GB\/The_shrinking_Aral_Sea_seen_from_Envisat_s_MERIS.jpg","esa_banner_description":"The shrinking Aral Sea, seen from Envisat's MERIS","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/07\/The_shrinking_Aral_Sea_seen_from_Envisat_s_MERIS2","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":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-935","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-water-world","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/935","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/comments?post=935"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/935\/revisions"}],"predecessor-version":[{"id":2078,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/935\/revisions\/2078"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=935"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=935"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=935"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=935"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=935"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=935"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=935"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=935"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=935"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}