Izindaba neNhlanganoIndawo

Yini ngempela eholela ekuguqulweni kwesimo sezulu: imisebenzi yomuntu noma ukuqhuma kwentaba-mlilo?

Uqaphele ukuthi abaningi abanesimo sengqondo sezulu abaphika umqondo wokushintsha kwesimo sezulu ngesimo sezulu bavame ukusebenzisa ingxabano evamile emisebenzini yabo. Bakholelwa ukuthi ukuqhuma kwezintaba-mlilo kungaholela ekukhululweni kwe-carbon dioxide ngaphezulu emkhathini kunokusebenza komuntu, ngakho-ke ukukhishwa kwamagesi okushisa okushisa akuthinti isimo sezulu.

Enye ingxabano efanayo: ukuqhuma kwe-volcanic kubangela ukuphefumula okukhulu kwe-sulfur dioxide lapho, lapho kwenzeka ukuqhuma okukhulu ngokwanele, kuphuza isimo sezulu, ngaleyo ndlela kufinyelela umthelela wazo zonke izigesi zokushisa ezivela emthonjeni we-anthropogenic.

Akudingeki ukuthi, zombili lezi zizathu aziphikisi ukugxekwa? Futhi yingakho.

Yiziphi amagesi ezingena emkhathini ngesikhathi sokuqhuma?

Ake siqale sicabange ngomqondo wokuqala ukuthi izintaba-mlilo zikhiqiza i-carbon dioxide engaphezu kwesintu.

Okokuqala, yebo, kuyiqiniso: izintaba-mlilo zikhiqiza kakhulu i-carbon dioxide kunezinye izinqubo eziningi. Eqinisweni, zikhulula inqwaba yegesi eyaziwa ngokuthi yizinto ezivuthayo, okugxilwe kuyo okuxhomeke kwisitayela sokuqhuma (ngokuzumayo nokuqhuma noma isikhathi eside nokuzola) kanye ne-geochemistry yomthombo we-magma. Amagesi ajwayelekile kunawo wonke amamoya amanzi, i-carbon dioxide, i-carbon monoxide, i-hydrogen sulfide ne-sulphuri oxides, nezinye eziningi.

Abathengi bemvelo bavame ukuveza ukuthi umthombo wamanzi yi-greenhouse gas ebaluleke kunazo zonke, kodwa le mpikiswano isetshenziselwa ukufakazela ukuthi i-carbon dioxide ayiyona inkinga. Umphunga wamanzi uvimbela ukukhanya kwelanga ukungena emkhathini, kodwa ukugxila kwawo ngokuqondile kuxhomeke ekushiseni. Inani lemphunga yamanzi emkhathini lingase libe ngaphezulu noma ngaphansi, futhi asikwazi ukushintsha lokhu.

Kungani kushintshwa isimo sezulu?

Kodwa lapha singakwazi ukulawula inani le-carbon dioxide emkhathini. Nakuba kuqhathaniswa namanye ama-gesi, lokhu akusilo isicupho esinamandla kakhulu sokushisa, kodwa i-carbon dioxide iyakwazi ukuhlala emkhathini iminyaka engu-200. Lokhu kwenza kube yi-gesi ebamba ukushisa ebaluleke kakhulu.

Ama-volcano akhiqiza kakhulu i-carbon. Eqinisweni, ngezinye izikhathi kuholela ekuqothulweni kwabantu abaningi. Isibonelo, isicupho saseSiberia yisifundazwe se-volcanic, eminyakeni eyizigidi ezingama-252 ezedlule iminyaka eyizigidi eziyi-1 eshicilela ukugeleza kwe-lava yobukhulu bezwekazi. Lokhu kuqhuma kukhishwe amathani ayizigidi ezingu-85 trillion dioxide emkhathini, okwenza izinga lokushisa lomhlaba wonke likhule ngo-6-8 ° C esikhathini esifushane kakhulu. Lokhu kwaholela Ekuqothulweni Okukhulu, okwakuyi-96% kuwo wonke umhlaba eMhlabeni kwabhujiswa. Kufana kakhulu ne-apocalypse, akunjalo?

Izinga lokuphuma

Kodwa lesi senzakalo sasiyingqayizivele ngempela, futhi ngisho noma kwenzeka namuhla, kungaba nje ngethunzi elimnyama eliqhathaniswa nesilinganiso sekhabhoni dioxide esithwa yisintu emoyeni njalo, futhi yilokho okushiwo. Sikhuluma ngejubane lemikhiqizo, futhi kulokhu sihamba phambili ngisho nangemifudlana enamandla kakhulu.

Izicupho zaseSiberia ziye zaholela ekukhululweni kwenqwaba ye-carbon dioxide isikhathi esifushane, kodwa isintu sikhiqiza ngisho nangaphezulu, futhi isikhathi esasikwazi ngaso ukwenza lokhu, kusukela ekubukeni kwesimo sezwe, sibonakala umzuzwana nje. Ngonyaka olinganiselwe, izintaba-mlilo zanamuhla zikhiqiza amathani ayizigidi eziyizinkulungwane ezingu-0,3 ze-carbon dioxide. Abantu baphonsa okungenani izikhathi eziyi-100, futhi lokhu kubalwa njalo ngonyaka.

Eqinisweni, emakhulwini eminyaka edlule ukuqhuma kwentaba-mlilo ukulahlekelwa njalo kuloluhlelo lwemisebenzi yabantu. Ngokuqondene nekusasa, kufanele kuqashelwe ukuthi azikho izinqubo zemvelo lapho izintaba-mlilo ziyokhipha khona kaboni dioxide ngaphezu komuntu. Ngakho-ke, le mpikiswano yama-skeptics ngeke neze iqiniseke.

Singakwazi yini ukusindisa i-sulfur dioxide?

Ngokuqondene nengxabano yesibili, ekuboneni kuqala konke kubonakala kunengqiqo: izintaba-mlilo zikhiqiza inani elikhulu le-sulfur dioxide. Lesi yisidakamizwa esibonakalisayo, kanti nokuningi okukuyo emkhathini, ukukhanya kwelanga okuncane kuyifinyelela eMhlabeni, okwenza kube ukupholisa.

Ngandlela-thile, ezinye i-geo-engineers zikholelwa ukuthi singaphakamisa amathani eshubhu sulfur emoyeni ukuze sikhokhele ukufudumala komuntu. Nakuba lokhu kungasebenza ngempela, kodwa isisombululo esinjalo sigcina kuphela inkinga, futhi ayiyikuyixazulula. Ngaphezu kwalokho, ungakhohlwa ngemvula ye-asidi, okungenzeka ukuthi yaphendulela konke lesi sulfure. Ngakho-ke, kungcono ukushiya lo mbono.

Indlela isibabule esithinta ngayo isimo sezulu

Mayelana nokukhishwa kwamabhilikithi, isulfure dioxide inethonya elikhulu esimweni sethu sezulu. Isibonelo, lapho ngo-1991 ukuqhuma kwePinatubo kwenzeka, izinga lokushisa lomhlaba lonke lawa ngamadijithi amaningana.

Ngo-1815 kwakukhona ukuqhuma okukhulu kweTambor, okwaholela ekukhululweni kwesulfure okuningi kangangokuthi ngo-1816 izingxenye eziningi zomhlaba azizange zilinde ukushisa ezinyangeni zasehlobo. Empeleni, le nkathi yayibizwa ngokuthi "Unyaka ngaphandle kwehlobo".

Kodwa imiphumela yokuqhuma kwesicupho saseSiberia kwakunzima nakakhulu. Ngaphambi kokuba i-carbon dioxide ekhishwe yizintaba-mlilo yaqala ukusebenza, i-sulfur ayi-75 trillion, eyangena emkhathini, empeleni yavala i-Sun iminyaka eminingana (uma kungenamakhulu eminyaka). Ngenxa yalokho, izinga lokushisa eplanethi liye lahla kakhulu, i-photosynthesis yamisa, futhi izinketho zokudla emhlabeni jikelele zawa.

"Umhlaba-Snowball"

Umphumela ophawuleka kakhulu we-sulfur aerosols ungabonwa, mhlawumbe ngenkathi kwakhiwa umhlaba we-Snowy. Cishe eminyakeni eyizigidi ezingu-700 kuya ku-800 ezedlule kule planethi kwakunomuntu oyedwa kuphela obizwa ngokuthi i-Homeland. Phakathi nokukhona kwama-supercontinents, njengoba umthetho, kuqhutshwa izintaba-mlilo ezikhulula isulfure kakhulu kune-carbon dioxide.

Lapho ukuqhuma kwezintaba-mlilo ngamakhilomitha angu-3220 ubude buqala, ama-sulfur aerosol avimbela ukukhanya kwelanga kangangokuthi amakhulu eminyaka eminyaka emva kwalokho iplanethi yayigcwele ama-glaciers ezigodini nase-equator. Ngakho, uMhlaba wawufana nebhola leqhwa elikhulu.

Lokhu-ke, kuyingozi, ngaphandle kwesibabule kungene emkhathini isikhathi eside kakhulu. Kodwa uma ukuqhuma okunjalo kwenzeka namuhla, umphumela wokufudumala wamagesi okushisa, ngaphandle kokungabaza, ungadlula isulfure.

Isiphi isiphetho esingadonsela? Sakha carbon dioxide eningi kangangokuthi izimpikiswano zombili abaphikisanayo azivumelani nokugxeka. Sithemba, sikwazi ukukuqinisekisa ngalokhu.

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