Lakabka ozone, ee inaga ilaaliya shucaaca ultraviolet, ayaa sii wiiqmaya. In kasta oo daloolka Antarctica uu xirmayo, meelaha ugu badan ee meeraha ka soo horjeedka ayaa ka dhacaya: isku-uruurinta ozone-ka ayaa hoos u dhacaya.
In kasta oo aysan wali caddayn sababta ay tani u dhaceyso, khubaradu waxay yiraahdaan qofka mas'uulka ka ah waa bani'aadamnimada, ama si ka sii saxan, qiiqa wasakheynta ah ee uu ku sii daayo hawada.
Ozone waa gaas aad u awood badan oo, siyaado ah, u sababi kara dhimasho dhicis ah dad aad u tiro badan, laakiin lakabyada ugu sareeya ee jawiga, masaafo dhan 15 ilaa 50 kiilomitir, waa gaashaanka ugu fiican ee difaaca anaga Dunida. Halkaas ayaa loo yaqaan 'ozone molecules', oo ka kooban saddex atam oo oksijiin ah, dabin ilaa 99% ee shucaaca ultraviolet iyo ku dhowaad dhammaan shucaaca infrared. Haddii aysan ahayn lakabkan, nolol ma jiri lahayn maadaama shucaaca uu macno ahaan u gubayo maqaarka iyo dhirta.
Tan anigoo og, layaab malahan tan iyo sanadkii 1985, sanadka godka lakabkan laga helay Antarctica, dhamaan hogaamiyaasha aduunka waxay isku raaceen in la mamnuuco chlorofluorocarbons (CFC). CFC-yada, oo ku jira aerosols iyo qaboojiyeyaasha, iyo kuwo kale, waxay daciifiyaan lakabka ozone. Si kastaba ha noqotee, in kasta oo mamnuucidan ay hoos u dhigtay isticmaalkeeda, ku guuldareystay inuu lakabka sii xoogeysto.
Sida laga soo xigtay daraasad, taas oo ku saleysneyd cabbiraadaha dayax gacmeedyada, buufinnada cimilada ku jira iyo moodellada cimilada-cimilada, fiirsashada ozone ee lakabyada dhexe iyo hoose ee stratosphere ayaa si joogto ah hoos u dhacday. Xaqiiqdii, hoos u dhac ayaa ku yimid 2,6 unugyo Dobson ah. Intaa waxaa sii dheer, lakabka hoose ee jawiga culeyska ayaa kordhay, taas oo ah dhibaato aad u daran maxaa yeelay, sidaan soo sheegnay, xad dhaafka ozone wuxuu u dhintaa nolosha.
Wixii macluumaad dheeraad ah, samee halkan guji.