{"id":60292,"date":"2025-12-09T08:36:53","date_gmt":"2025-12-09T08:36:53","guid":{"rendered":"https:\/\/www.europesays.com\/ee\/60292\/"},"modified":"2025-12-09T08:36:53","modified_gmt":"2025-12-09T08:36:53","slug":"antarktika-osooniauk-oli-tanavu-ootamatult-vaike-keskkond","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/ee\/60292\/","title":{"rendered":"Antarktika osooniauk oli t\u00e4navu ootamatult v\u00e4ike | Keskkond"},"content":{"rendered":"

Antarktika kohal igal s\u00fcgisel avanev osooniauk oli sel aastal ootamatult v\u00e4ike. Ameerika \u00dchendriikide kosmoseameti NASA ning mere- ja \u00f5huvallaameti NOAA teadlaste hinnangul osutab see t\u00f5ik, et osooniaugu vastane Montreali 1987. aasta kokkulepe ja selle hilisemad lisaprotokollid t\u00f6\u00f6tavad t\u00f5husalt.<\/p>\n

Need lepped on j\u00e4rsult kahandanud osooni h\u00e4vitavate ainete atmosf\u00e4\u00e4ri sattumist, ja ehkki osoonimure l\u00f5plik lahenemine n\u00f5uab siiski veel aega, taastub inimtegevusest tulenenud emissioonide eelne olukord teadlaste hinnangul sel sajandil. Osoonivastaste ainete tippkontsentratsioon Maa atmosf\u00e4\u00e4ris oli teadlaste s\u00f5nul aastal 2000.<\/p>\n

\u00d5hupallidelt tehtud m\u00f5\u00f5tmised n\u00e4itavad, et l\u00f5unapooluse kohal langes atmosf\u00e4\u00e4ri l\u00e4bivas \u00f5husambas sisalduva osooni hulk t\u00e4navu 6. oktoobril 147 Dobsoni \u00fchikuni, ja see j\u00e4igi t\u00e4navuseks miinimumtasemeks. K\u00f5ige h\u00f5redam oli osoonisisaldus l\u00f5unapooluse kohal aasta 2006 oktoobris \u2014 92 Dobsoni \u00fchikut.<\/p>\n

<\/p>\n

Maakera atmosf\u00e4\u00e4ri osoonikiht kaitseb elusolendeid \u00fclem\u00e4\u00e4rase ultraviolettkiirguse eest. Kui osooni on v\u00e4he, v\u00f5ib kannatada inimeste ja teiste olendite tervis ja muu hulgas kahaneda ka viljasaak.<\/p>\n

Osoonikiht asub stratosf\u00e4\u00e4ris, atmosf\u00e4\u00e4rikihis, mis ulatub k\u00fcmmekonna kilomeetri k\u00f5rguselt kuni umbes 50 kilomeetri k\u00f5rguseni maapinnast.<\/p>\n

Osooni h\u00e4vitavad inimtegevuse toimel peamiselt freoonid ehk klorofluoros\u00fcsinikud, mis leidsid omal ajal laialdast kasutust k\u00fclmkappides, \u00f5hukonditsioneerides, tulekustutites ja aerosoolipihustites.<\/p>\n

Freoonid toimivad tugeva katal\u00fcsaatorina, mis l\u00f5huvad kolmest hapnikust koosnevaid osooni molekule t\u00f5husalt ja hulgakaupa. T\u00e4psemalt \u00f6eldes on l\u00f5hkujaks klooriioon, mis eraldub freoonist ultraviolettkiirguse toimel. \u00dcks klooriioon v\u00f5ib m\u00f5ne aastaga l\u00f5hkuda umbes sada tuhat osooni molekuli, enne kui ta l\u00f5puks ise stratosf\u00e4\u00e4rist kaob.<\/p>\n

Antarktika osooniauk ei kahane aastast aastasse p\u00e4ris j\u00e4rjekindlalt, sest ilmastikun\u00e4htused nagu tuul ja \u00f5hutemperatuur v\u00f5ivad ta suurust siia-sinna m\u00f5jutada. Seep\u00e4rast v\u00f5ib auk j\u00e4rgmisel aastal j\u00e4lle ka natuke suurem olla.<\/p>\n

Teadusuudised on Vikerraadios eetris esmasp\u00e4evast reedeni ca kell 8.35 ja laup\u00e4eval ca kell 8.25.<\/p>\n","protected":false},"excerpt":{"rendered":"Antarktika kohal igal s\u00fcgisel avanev osooniauk oli sel aastal ootamatult v\u00e4ike. Ameerika \u00dchendriikide kosmoseameti NASA ning mere- ja…\n","protected":false},"author":2,"featured_media":60293,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[80],"tags":[27222,26,27,37,33,35,34,36,31,32,21,28,29,95,19,28168,28173,25,23,24,22,20,30,92,93,94],"class_list":{"0":"post-60292","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-maailm","8":"tag-antarktika","9":"tag-breaking-news","10":"tag-breakingnews","11":"tag-ee","12":"tag-eesti","13":"tag-eesti-keel","14":"tag-estonia","15":"tag-estonian","16":"tag-featured-news","17":"tag-featurednews","18":"tag-headlines","19":"tag-latest-news","20":"tag-latestnews","21":"tag-maailm","22":"tag-news","23":"tag-osoon","24":"tag-osooniauk","25":"tag-populaarseimad-lood","26":"tag-top-stories","27":"tag-topstories","28":"tag-uldised-uudised","29":"tag-uudised","30":"tag-viimased-uudised","31":"tag-world","32":"tag-world-news","33":"tag-worldnews"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@ee\/115688704861679115","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts\/60292","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/comments?post=60292"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/posts\/60292\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/media\/60293"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/media?parent=60292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/categories?post=60292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/ee\/wp-json\/wp\/v2\/tags?post=60292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}