{"id":985,"date":"2005-09-09T10:02:00","date_gmt":"2005-09-09T08:02:00","guid":{"rendered":"https:\/\/kids.esa.int\/swollen_ozone_hole_over_south_pole\/"},"modified":"2026-10-08T00:34:32","modified_gmt":"2026-10-07T22:34:32","slug":"swollen_ozone_hole_over_south_pole","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/swollen_ozone_hole_over_south_pole\/","title":{"rendered":"Etel\u00e4navan yl\u00e4puolella oleva laajentunut otsonikato"},"content":{"rendered":"
\n

Korkealla Antarktiksen j\u00e4isen mantereen yl\u00e4puolella ESA:n Envisat-avaruusluotain tarkkailee tilannetta \u2013 ja sen laitteiden havainnot ovat varsin huolestuttavia.<\/p>\n<\/div>\n

Pakkasl\u00e4mp\u00f6tilat ja ihmisen tuottamat kemikaalit aiheuttavat yhdess\u00e4 \u2018aukon\u2019 otsonikerroksessa. Ja t\u00e4m\u00e4n vuoden otsoniaukko n\u00e4ytt\u00e4\u00e4 olevan yksi suurimmista, mit\u00e4 on koskaan mitattu.<\/p>\n

Elokuun puoliv\u00e4liin 2005 menness\u00e4 se oli jo laajentunut 10 miljoonan neli\u00f6kilometrin alueeksi \u2013 suunnilleen Euroopan kokoiseksi. Sen odotettiin laajenevan viel\u00e4 lis\u00e4\u00e4 syyskuun aikana.<\/p>\n

Otsonikato havaittiin ensimm\u00e4isen kerran 1980-luvun puoliv\u00e4liss\u00e4, ja ESA:n satelliitit ovat tutkineet otsonikatoa jatkuvasti vuodesta 1995 l\u00e4htien. Niiden mittaustietojen mukaan vain vuosien 1996 ja 2000 otsonikadot olivat suurempia t\u00e4h\u00e4n aikaan vuodesta.<\/p>\n

\"ESA's
ESAn Envisat-ymp\u00e4rist\u00f6satelliitti<\/figcaption><\/figure>\n

Otsoni on hapen muoto. Pieni\u00e4 m\u00e4\u00e4ri\u00e4 otsonia esiintyy stratosf\u00e4\u00e4riss\u00e4, 20\u201350 km:n korkeudella maanpinnasta.<\/p>\n

Onneksemme otsonikerros suojaa meit\u00e4 auringon ultraviolettis\u00e4teilylt\u00e4, joka voi aiheuttaa ihosy\u00f6p\u00e4\u00e4. Ihmisen tuottaman kloorin aiheuttamat kemialliset reaktiot korkealla sijaitsevissa pilviss\u00e4 tuhoavat kuitenkin otsonia.<\/p>\n

Polaarisen kev\u00e4\u00e4n saapuessa palaavan auringonvalon ja kloorin kemiallisten reaktioiden yhteisvaikutuksesta otsonimolekyylit hajoavat hapeksi. Yksi ainoa kloorimolekyyli voi hajottaa tuhansia otsonimolekyylej\u00e4.<\/p>\n

Envisat-satelliitin toimittamat tiedot ovat elint\u00e4rkeit\u00e4 t\u00e4m\u00e4n suojakerroksen kausivaihteluiden seurannalle. Satelliittitiedot sy\u00f6tet\u00e4\u00e4n l\u00e4hes reaaliaikaiseen otsonin seuranta- ja ennustespalveluun, johon osallistuu yli 30 kumppania 11 maasta.<\/p>","protected":false},"excerpt":{"rendered":"

High above the icy continent of Antarctica, ESA\u2019s Envisat spacecraft is keeping watch – and what its instruments see is rather disturbing. Freezing temperatures and man-made chemicals are combining to […]<\/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\/2005\/09\/ozone_forecast_for_9_september2\/17880735-2-eng-GB\/Ozone_forecast_for_9_September.jpg","esa_banner_description":"Ozone forecast for 9 September","esa_banner_credit":"KNMI\/ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2005\/09\/Ozone_forecast_for_9_September2","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":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-985","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/985","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=985"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/985\/revisions"}],"predecessor-version":[{"id":4777,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/985\/revisions\/4777"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=985"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=985"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=985"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=985"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=985"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=985"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=985"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=985"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=985"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=985"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}