Guhindura inyanja guhangana n’imihindagurikire y’ikirere »TechnoCodex

Ubushakashatsi bushya bwerekana ko umwuka wa ogisijeni uri mu nyanja ya kera udasanzwe ushobora guhangana n’imihindagurikire y’ikirere.
Abahanga mu bya siyansi bakoresheje urugero rwa geologiya mu kugereranya umwuka wa ogisijeni wo mu nyanja mu gihe cy'ubushyuhe bukabije ku isi mu myaka miriyoni 56 ishize, kandi bavumbuye “kwaguka gukabije” kwa hypoxia (hypoxia) ku nyanja.
Mubihe byashize nubu, ubushyuhe bwisi butwara ogisijeni yo mu nyanja, ariko ubushakashatsi buheruka kwerekana bwerekana ko ubushyuhe bwa 5 ° C muri Paleocene Eocene Maximum Temperature (PETM) bwateje hypoxia kutarenza 2% byubutaka bwisi.
Nubwo bimeze bityo ariko, uko ibintu bimeze muri iki gihe bitandukanye na PETM-ibyuka byangiza imyuka ya karubone byihuta cyane, kandi twongeyeho umwanda w’intungamubiri mu nyanja-byombi bishobora gutuma habaho gutakaza ogisijeni byihuse kandi bikabije.
Ubushakashatsi bwakozwe nitsinda mpuzamahanga harimo abashakashatsi bo muri ETH Zurich, kaminuza ya Exeter na kaminuza ya Royal Holloway ya London.
Umwanditsi mukuru wa ETH Zurich, Dr. Matthew Clarkson, yagize ati: “Amakuru meza yavuye mu bushakashatsi bwacu ni uko nubwo ubushyuhe bw’isi bumaze kugaragara, gahunda y’isi ntiyahindutse mu myaka miriyoni 56 ishize.Irashobora kurwanya deoxygene munsi yinyanja.
Ati: "By'umwihariko, twizera ko Paleocene ifite ogisijeni yo mu kirere irenze iy'uyu munsi, bizagabanya amahirwe ya hypoxia.
Ati: “Byongeye kandi, ibikorwa by'abantu birimo gushyira intungamubiri nyinshi mu nyanja binyuze mu ifumbire no guhumana, bishobora gutera umwuka wa ogisijeni no kwangiza ibidukikije.”
Kugereranya urugero rwa ogisijeni yo mu nyanja mugihe cya PETM, abashakashatsi basesenguye imiterere ya isotopique ya uranium mu bishanga byo mu nyanja, yakurikiranaga ingufu za ogisijeni.
Kwigana mudasobwa ishingiye ku bisubizo byerekana ko ubuso bw’inyanja ya anaerobic bwiyongereyeho inshuro zigera ku icumi, bigatuma ubuso bwose butarenga 2% by’ubutaka bw’inyanja ku isi.
Ibi biracyafite akamaro, bikubye inshuro icumi ubuso bwa hypoxia igezweho, kandi byateje ingaruka mbi no kuzimangana mubuzima bwinyanja mubice bimwe na bimwe byinyanja.
Porofeseri Tim Lenton, Umuyobozi w'ikigo cya Exeter Institute for Global Systems, yagize ati: “Ubu bushakashatsi bwerekana uburyo imiterere y’imiterere y’ikirere y’isi ihinduka uko ibihe bigenda bisimburana.
"Urutonde turimo inyamaswa z’inyamabere-primates-zikomoka kuri PETM.Kubwamahirwe, nkuko primates zacu zateye imbere mumyaka miriyoni 56 ishize, inyanja isa nkaho yarushijeho gukomera.. ”
Porofeseri Renton yongeyeho ati: “Nubwo inyanja ishobora guhangana cyane kuruta ikindi gihe cyose, nta kintu na kimwe gishobora kutubuza gukenera byihutirwa kugabanya ibyuka bihumanya ikirere no guhangana n'ikibazo cy'ikirere cy'iki gihe.”
Uru rupapuro rwasohotse mu kinyamakuru Nature Communications gifite umutwe ugira uti: “Umupaka wo hejuru w’urwego rwa hypoxia ya isotopi ya uranium mu gihe cya PETM.”
Iyi nyandiko irinzwe nuburenganzira.Usibye ibikorwa byose biboneye byo kwiga wenyine cyangwa intego zubushakashatsi, ntakintu gishobora kwimurwa nta ruhushya rwanditse.Ibirimo ni ibyerekanwe gusa.