Kutheni le nto kwabakho ubushushu behlabathi kwiminyaka engama-56 yezigidi eyadlulayo?

Kwiminyaka engama-56 yezigidi eyadlulayo kwabakho ubushushu behlabathi

Abanye abantu abasazi ukuba oku kufudumala kwehlabathi esikufumanayo namhlanje kokokuqala ukuba kwenzeke eMhlabeni. Nangona kunjalo, kuninzi ukufudumala kwehlabathi kunye notshintsho lwemozulu olwenzekileyo kwiplanethi yethu kuyo yonke imbali. Yintoni ebalulekileyo ekufuneka siyikhankanyile kukuba akukho kushushu kobushushu emhlabeni kuye kwenzeka ngaphambili ibilixesha elincinci elifana neli langoku. Ngamanye amagama, ngumntu othi, ngemisebenzi yakhe engcolisayo, akhawulezise inkqubo yokufudumeza umhlaba ngenxa yokukhutshwa kwegesi yendlu eluhlaza.

Malunga neminyaka engama-56 ezigidi eyadlulayo, uMhlaba wabethwa kukufudumala okungaginyisi mathe, nto leyo eyaziwayo njenge Ubuninzi bePaleocene-Eocene Thermal (MTPE, okanye i-PETM kwisifinyezo sayo ngesiNgesi). Ngaba uyafuna ukwazi ukuba yintoni ebangele ukunyuka kobushushu emhlabeni?

Ubushushu behlabathi kwiminyaka engama-56 yezigidi eyadlulayo

Ubushushu behlabathi kudala

Ngelo xesha, abantu babengekabikho, ngoko ke ngekhe sibengunobangela wokufudumala komhlaba. Kulabo bacinga ukuba oku kuyindalo kwaye uMhlaba uyabandezeleka amaxesha ngamaxesha ukufudumala kwehlabathi okukhokelela kutshintsho lwemozulu, kwaye oku kuyinto eqhelekileyo, akunjalo.

Kuyinyani ukuba ezinye izigidi zeminyaka, uMhlaba uye wabandezeleka kukunyuka okungalindelekanga kwamaqondo obushushu kunye notshintsho kwimozulu, kodwa ukwenzile oko ngamaxesha amawaka namawaka eminyaka. Kwinguqu yethu yemozulu yangoku, kunjalo Kuphele malunga neminyaka engama-250 okoko kwaqala uguquko kwimizi-mveliso kwaye kwaqala ukukhutshwa iigesi zegreenhouse.

Malunga neminyaka engama-56 ezigidi eyadlulayo isixa esikhulu sekharbhon diokside (CO2) esikhutshwe kwiatmosfera ephakamise kakhulu ubushushu kwihlabathi lonke. I-Paleocene-Eocene Thermal Maximum ngokungathandabuzekiyo sisiganeko esihambelana nayo okona kukhawulezayo kunye nobushushu obugqithisileyo ukuba iplanethi yethu ibinayo ngokwendalo kwiminyaka engama-66 yezigidi edlulileyo. Ubushushu behlabathi buqhubeke malunga neminyaka engama-150.000, kwaye ubushushu behlabathi bonyuke nge-5 degrees Celsius, ukonyuka okuthelekiswa nolunye uqikelelo olwenziwe kwimozulu yanamhlanje ngaphaya kokuphela kwale nkulungwane.

Isizathu sokufudumala kwehlabathi

Ukuqhuma kweentaba-mlilo sisizathu sokufudumala kwehlabathi

Oku kufudumala kwehlabathi kwenzeka ngesiquphe kwaye kwakungabangelwa ngabantu. Ke yintoni enokubangela ukunyuka kwamaqondo obushushu kwihlabathi liphela? Kucetyisiwe kwindawo yezenzululwazi ukuba ibangelwe ukujova ikhabhoni elwandle kunye neatmosfera, oyena nobangela wokugqibela, umthombo wale khabhoni, kunye nesixa esipheleleyo esikhutshiweyo, ukuza kuthi ga ngoku bekungaziwa.

Nangona kunjalo, zingavela phi ezo zixa ze-CO2 ekubeni iqondo lobushushu beplanethi iphela lenyuka nge-5 ° C ngokomndilili? Uphando olwenziwe liqela lehlabathi likaMarcus Gutjahr, ngaphambili kwi iYunivesithi yaseSouthampton e-UK kwaye ngoku i-GEOMAR (Iziko le-Helmholtz loPhando nge-Ocean) e-Kiel, eJamani linika umbono wokuba kusenokwenzeka ukuba kungenxa yokukhutshwa kwegesi ziintaba-mlilo.

Kude kube namhla, iintaba-mlilo azinaxanduva lokonyuka koxinaniso lweegesi zegreenhouse, ke yinto eqhelekileyo ukucinga ukuba kwixa elidlulileyo. Nangona kunjalo, kufuneka kuthathelwe ingqalelo ukuba umsebenzi wentaba-mlilo kwizigidi ezininzi zeminyaka eyadlulayo wawusenzeka rhoqo kwaye unamandla kunanamhlanje.

Uphando kunye nemilinganiselo

ukufudumala kwehlabathi

Ukufumanisa isizathu sokukhutshwa kwe-CO2, indibaniselwano yemilinganiselo entsha ye-geochemical kunye nemodeli yemozulu yehlabathi isetyenzisiwe, ukumisela ukuba oku kushushu kobushushu obugqithisileyo kubangelwe kukuphindaphindeka kokuphindaphindeka komhlaba kwe-CO2. Xa sithetha igama ngokukhawuleza sibhekisa kwixesha elingaphantsi kweminyaka engama-25.000 (Kungenxa yoko le nto singenako ukuthelekisa oku kufudumala kwehlabathi kunye nale ikhoyo ngoku, kude nayo), kunye neentaba-mlilo ezingoyena nobangela wale nto ikhutshiweyo.

Ukongeza, inokubuyiselwa ukubonga ngenxa yokuba eli xesha ngaphezulu okanye kancinci lihambelana nokwenziwa kwezandiso ezinkulu zebhedi yolwandle, ngenxa yemali enkulu yelava ethe yanwenwela emazantsi. Oku kwenzeka xa iGreenland yaqala ukwahlukana nomntla-ntshona weYurophu, isenza uLwandlekazi lweAtlantic.


Shiya uluvo lwakho

Idilesi yakho ye email aziyi kupapashwa. ezidingekayo ziphawulwe *

*

*

  1. Uxanduva lwedatha: UMiguel Ángel Gatón
  2. Injongo yedatha: Ulawulo lwe-SPAM, ulawulo lwezimvo.
  3. Umthetho: Imvume yakho
  4. Unxibelelwano lwedatha: Idatha ayizukuhanjiswa kubantu besithathu ngaphandle koxanduva lomthetho.
  5. Ukugcinwa kweenkcukacha
  6. Amalungelo: Ngalo naliphi na ixesha unganciphisa, uphinde uphinde ucime ulwazi lwakho.