{"id":939,"date":"2004-12-03T10:20:00","date_gmt":"2004-12-03T09:20:00","guid":{"rendered":"https:\/\/kids.esa.int\/losing_the_ozone_layer\/"},"modified":"2026-10-08T00:34:00","modified_gmt":"2026-10-07T22:34:00","slug":"losing_the_ozone_layer","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/losing_the_ozone_layer\/","title":{"rendered":"Otsonikerroksen ohentuminen"},"content":{"rendered":"
\n

Oletko koskaan k\u00e4rsinyt auringonpolttamasta? T\u00e4m\u00e4 ihon palaminen johtuu auringon ultraviolettis\u00e4teilyst\u00e4 (UV). Vakava auringonpolttama ei ole vain kivulias, vaan se voi my\u00f6s aiheuttaa ihosy\u00f6p\u00e4\u00e4.<\/p>\n<\/div>\n

Onneksi l\u00e4hes kaikki haitallinen UV-s\u00e4teily imeytyy otsonikerrokseen, joka sijaitsee 20\u201350 km:n korkeudella maanpinnasta. Otsoni on kuitenkin hapen muoto, joka tuhoutuu helposti tiettyjen ihmisen valmistamien kemikaalien vaikutuksesta.<\/p>\n

Vuonna 1987 johtavat teollisuusmaat sopivat n\u00e4iden kemikaalien k\u00e4yt\u00f6n lopettamisesta vaiheittain. T\u00e4st\u00e4 huolimatta satelliittikuvien perusteella otsonikerroksen oheneminen on jatkunut Etel\u00e4mantereen yl\u00e4puolella. Otsonireik\u00e4 saavutti enn\u00e4tyskokonsa vuonna 2000, jolloin se kattoi l\u00e4hes 30 miljoonaa neli\u00f6kilometri\u00e4, mik\u00e4 vastaa suunnilleen Pohjois-Amerikan mantereen kokoa. Vuonna 2006 ilmakeh\u00e4st\u00e4 h\u00e4visi viel\u00e4 suurempi m\u00e4\u00e4r\u00e4 otsonia, vaikka aukko oli hieman pienempi.<\/p>\n

My\u00f6s arktisen alueen yl\u00e4puolelle on ilmestynyt pienempi\u00e4 otsonikoloja. N\u00e4iden kolojen kautta enemm\u00e4n UV-s\u00e4teily\u00e4 p\u00e4\u00e4see Euroopan tihe\u00e4sti asutuille alueille.<\/p>\n

\"Ozone
Otsonikadon ennuste t\u00e4n\u00e4\u00e4n \u2013 9. syyskuuta<\/figcaption><\/figure>\n

ESA:n satelliitit, kuten MetOp ja Envisat, ovat keskeisess\u00e4 asemassa otsonikadon tutkimuksessa. Niiden avulla tutkijat voivat seurata otsonikadon kokoa ja selvitt\u00e4\u00e4 tarkemmin, mist\u00e4 syist\u00e4 se kasvaa tai pienenee.<\/p>\n

Euroopan ensimm\u00e4isess\u00e4 polaarikiertoradalla liikkuvassa s\u00e4\u00e4satelliitissa, MetOp-A:ssa, on edistyksellinen otsoninmittauslaite. Envisat-satelliitissa on kolme laitetta, joilla voidaan tutkia otsonia ja sit\u00e4 yl\u00e4ilmakeh\u00e4ss\u00e4 vahingoittavia ep\u00e4puhtauksia.<\/p>","protected":false},"excerpt":{"rendered":"

Have you ever suffered from sunburn? This burning of the skin is caused by ultraviolet (UV) light from the Sun. Serious burning is not only painful, but it may cause […]<\/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\/2004\/09\/ozone_sky2\/17877959-2-eng-GB\/ozone_sky.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/09\/ozone_sky2","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":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-939","post","type-post","status-publish","format-standard","hentry","category-climate-change","category-earth","category-learn","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/939","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=939"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/939\/revisions"}],"predecessor-version":[{"id":4749,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/939\/revisions\/4749"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=939"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=939"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=939"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=939"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=939"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=939"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=939"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=939"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=939"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=939"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}