Ozone depletion
Lub Ob Hlis Ntuj 1985, lub British Antarctic Expedition Team Long Hair (J.Farman) tau qhia thawj zaug tias tus nqi tag nrho ntawm ozone tshaj Antarctica tau raug txo luv los ntawm ib nrab xyoo ntawm xyoo 1977 mus txog rau thaum lub Kaum Hlis Cuaj Hli, tsim ib lub "ozone hole" uas tseem rov pib dua lub Kaum Ib Hlis, ua rau lub ntiaj teb poob siab.
Ozone-depleting compounds, ntxiv rau cov hom daus, kuj siv tau rau hauv aerosol propellants, cov neeg ua kab, thiab cov khoom hluav taws xob hauv cov txheej txheem tu tsev kho mob. Lub neej ntev-uas muaj bromine tebchaw, xws li Al-Haroun (Haion) Hluav Taws Kub Taws Hluav Taws Xob, tseem ua lub luag haujlwm tseem ceeb nyob rau hauv ozone depletion.
Cov tshuaj chlorine thiab nitric oxide (TSIS TAU) tuaj yeem tshwm sim nrog lub cev thiab tsim tau thiab siv cov CFCs hauv lub ntiaj teb vim yog cov kua txob
Nws cov tshuaj ruaj khov yog qhov zoo (xws li lub neej atmospheric ntawm CFC12 rau 102 xyoos) tsis yooj yim hauv lub troposphere decomposition, los ntawm txoj kev ua hauv tsev rau hauv lub ozone txheej txheem ntawm lub stratosphere, nyob rau hauv lub luv luv yoj ultraviolet UV-C irradiation, decomposition ntawm CI dawb radicals, koom tes nyob rau hauv qhov noj ntawm ozone.
Ua ntej yuav ua rau nws ua kom tsis muaj zog, cov tshuaj no yuav tsum muaj ob yam: chlorine, bromine los yog lwm yam atom uas muaj ntsis zoo sib xws nrog cov tshuaj lom neeg lub cev ntawm cov pa oxygen, uas yuav tsum nyob ruaj khov rau hauv qab huab cua (piv txwv, lub ozone txheej txheem. Piv txwv, HFCs HCF22 thiab HCFC123, tag nrho cov muaj ib qho tshuaj chlorine, yuav noj nws, nws qhov atmospheric lub neej yog 12.1 thiab 14 raws li, thiab chlorine atoms kuj cus ciav, muaj peev xwm decompose nyob rau hauv lub chaw qis dua, tus naj npawb ntawm kev ncav lub ozone txheej tsis ntau . Yog li, HCFC22 thiab HCFC123 ua rau lub cev tsis muaj zog ntau dua li CFCs.
