Uphononongo olutsha lubonisa ukuba umxholo we-oksijini kwiilwandle zakudala uyamangalisa ngokumangalisayo ukuchasana nokutshintsha kwemozulu.
Oosonzululwazi basebenzise iisampulu zejoloji ukuqikelela i-oksijini yolwandle ngexesha lokufudumala kwehlabathi kwiminyaka eyi-56 yezigidi eyadlulayo, kwaye bafumanisa "ukwandiswa okulinganiselweyo" kwe-hypoxia (hypoxia) emgangathweni wolwandle.
Kwixesha elidlulileyo kunye nangoku, ukufudumala kwehlabathi kudla i-oksijeni yolwandle, kodwa uphando olutshanje lubonisa ukuba ukufudumala kwe-5 ° C kwi-Paleocene Eocene Maximum Temperature (PETM) kubangele i-hypoxia ukuba ingabi ngaphezu kwe-2% yomgangatho wolwandle.
Nangona kunjalo, imeko yanamhlanje yahlukile kwi-PETM-imveliso yekhabhoni yanamhlanje ikhawuleza kakhulu, kwaye songeza ungcoliseko lwezondlo elwandle-zombini zinokukhokelela ekulahlekeni okukhawulezileyo kunye nokusasazeka kweoksijini.
Uphando lwenziwa liqela lamazwe ngamazwe eliquka abaphandi abavela kwi-ETH Zurich, iYunivesithi yase-Exeter kunye neYunivesithi yaseRoyal Holloway yaseLondon.
Umbhali okhokelayo we-ETH Zurich, uGqr. Matthew Clarkson, wathi: “Iindaba ezimnandi kuphando lwethu zezokuba nangona ukufudumala komhlaba sele kubonakala, inkqubo yomhlaba ayizange itshintshe kwiminyaka engama-56 yezigidi eyadlulayo.Iyakwazi ukumelana ne-deoxygenation emazantsi olwandle.
Ngokukodwa, sikholelwa ukuba i-Paleocene ine-oksijini ephezulu ye-atmospheric kunanamhlanje, eya kunciphisa ukuba nokwenzeka kwe-hypoxia.
Ukongeza, imisebenzi yabantu ibeka izondlo ezininzi elwandle ngesichumiso kunye nongcoliseko, olunokubangela ukulahleka kweoksijini kunye nokukhawulezisa ukonakaliswa kwendalo.
Ukuqikelela amanqanaba eoksijini yolwandle ngexesha le-PETM, abaphandi bahlalutya ukwakheka kwe-isotopic yeuranium kwintlenga yolwandle, elandelela ukuxinana kweoksijini.
Ukulinganisa kwekhompyuter okusekwe kwiziphumo kubonisa ukuba indawo yolwandle lwe-anaerobic yonyuke ukuya kuthi ga kwizihlandlo ezilishumi, nto leyo eyenza ukuba indawo iyonke ingabi ngaphezu kwe-2% yendawo ephantsi kolwandle.
Oku kusabalulekile, malunga neshumi lendawo ye-hypoxia yanamhlanje, kwaye ibangele ngokucacileyo iziphumo ezinobungozi kunye nokuphela kwezinto eziphilayo zaselwandle kwiindawo ezithile zolwandle.
Unjingalwazi uTim Lenton, uMalathisi we-Exeter Institute for Global Systems, wathi: “Olu hlolisiso lubonisa indlela ukuguquka kokutshintsha kwemozulu yomhlaba njengoko ixesha lihamba.
“Ulandelelwano apho singamalungu ezilwanyana ezanyisayo-iphuma kwi-PETM.Ngelishwa, njengoko iiprimates zethu ziye zakhula kwisithuba seminyaka ezizigidi ezingama-56 edlulileyo, ulwandle lubonakala lusiya lusiba ne-inelastic..”
Unjingalwazi uRenton wongezelela wathi: “Nangona ulwandle lwazimelela ngakumbi kunangaphambili, akukho nto inokusiphazamisa kwimfuno yethu engxamisekileyo yokunciphisa ukukhutshwa kwezinto ezikhutshwayo nokusabela kwingxaki yemozulu yanamhlanje.”
Eli phepha lapapashwa kwiphephancwadi iNature Communications elinesihloko esithi: “Umda ophezulu weqondo le-hypoxia ye-uranium isotopes ngexesha le-PETM.”
Olu xwebhu lukhuselwe yi-copyright.Ngaphandle kwayo nayiphi na intengiselwano efanelekileyo yokufunda yabucala okanye iinjongo zophando, akukho mxholo unokukotshwa ngaphandle kwemvume ebhaliweyo.Umxholo ubhekiselele kuphela.
Ixesha lokuposa: Jan-19-2021