Chidzidzo chitsva chinoratidza kuti iyo oksijeni yemukati mumakungwa ekare zvinoshamisa inokwanisa kurwisa shanduko yemamiriro ekunze.
Masayendisiti akashandisa geological samples kufungidzira okisijeni yegungwa panguva yekudziya kwepasi makore 56 miriyoni apfuura, uye vakawana "kumwe kuwedzera kudiki" kwe hypoxia (hypoxia) pasi pegungwa.
Munguva yakapfuura uye ikozvino, kupisa kwepasi kunopedza mweya wegungwa, asi tsvakurudzo yazvino inoratidza kuti kudziya kwe5 ° C muPaleocene Eocene Maximum Temperature (PETM) yakakonzera hypoxia kuti irege kudarika 2% yepasi pegungwa repasi rose.
Nekudaro, mamiriro anhasi akasiyana nePETM-yanhasi kabhoni emissions inokurumidza, uye isu tiri kuwedzera kusvibiswa kwekudya kugungwa-zvose zvinogona kutungamirira mukukurumidzira uye kupararira kurasikirwa kweokisijeni.
Tsvagiridzo iyi yakaitwa nechikwata chepasi rose chinosanganisira vaongorori kubva kuETH Zurich, University of Exeter uye Royal Holloway University yeLondon.
Munyori anotungamirira weETH Zurich, Dr. Matthew Clarkson, akati: “Mashoko akanaka anobva mukunzvera kwedu ndeokuti kunyange zvazvo kudziya kwepasi kuri kutooneka, gadziriro yapasi yakaramba isina kuchinja makore ane mamiriyoni 56 apfuura.Inogona kuramba deoxygenation pasi pegungwa.
"Kunyanya, isu tinotenda kuti Paleocene ine yakakwira okisijeni yemuchadenga kupfuura nhasi, izvo zvinoderedza mukana we hypoxia.
"Uyezve, mabasa evanhu ari kuisa kudya kwakawanda mugungwa kuburikidza nefetereza uye kusvibiswa, izvo zvinogona kukonzera kurasikirwa kweokisijeni uye kukurumidza kukanganisa kwezvakatipoteredza."
Kufungidzira mwero weokisijeni yemugungwa panguva yePETM, vaongorori vakaongorora isotopic kuumbwa kweuranium mumakungwa egungwa, iyo yakateedzera kuwanda kweokisijeni.
Mienzaniso yemakombuta yakavakirwa pamhedzisiro inoratidza kuti nzvimbo yegungwa reanaerobic yakawedzera kusvika kagumi, zvichiita kuti nzvimbo yese isapfuure 2% yenzvimbo yepasi pegungwa.
Izvi zvichiri kukosha, ingangoita kagumi nzvimbo yemazuva ano hypoxia, uye zvakakonzera zvinokuvadza uye kuparara kwehupenyu hwemugungwa mune dzimwe nzvimbo dzegungwa.
Purofesa Tim Lenton, Mutungamiriri weExeter Institute for Global Systems, akati: “Kuongorora uku kunoratidza kuti kusachinjika kwemamiriro ekunze ePasi kunochinja sei nekufamba kwenguva.
“Kurongeka kwatinobva kumhuka dzinoyamwisa-maprimates-kwakabva kuPETM.Nehurombo, sezvo maprimate edu akasimukira mukati memakore 56 miriyoni apfuura, gungwa rinoratidzika kunge rave kuwedzera kusagadzikana..”
Purofesa Renton akawedzera kuti: “Kunyange zvazvo gungwa richigadzikana zvikuru kupfuura nakare kose, hapana chinogona kutitsausa pakuda kwedu kwokukurumidzira kuderedza utsi uye kuita maererano nedambudziko remamiriro ekunze ranhasi.”
Pepa racho rakabudiswa mujenari Nature Communications ine zita: "Muganho wepamusoro weiyo dhigirii ye hypoxia yeuranium isotopes panguva yePETM."
Gwaro iri rinodzivirirwa nekodzero.Kunze kwekuita chero kwakanaka kwekudzidza kwakavanzika kana zvinangwa zvekutsvagisa, hapana zvirimo zvinogona kukopwa pasina mvumo yakanyorwa.Zvirimo ndezvekutarisa chete.
Nguva yekutumira: Jan-19-2021