Phuputso e tebileng e etelletsoeng pele ke bafuputsi ba Univesithi ea Arizona e ka 'na eaba e rarolotse liphiri tse peli tseo e leng khale li makalitse litsebi tsa boemo ba leholimo ba paleo: Leqhoa le neng le le teng mehleng ea ho qetela ea leqhoa lilemong tse fetang 100,000 XNUMX tse fetileng le ne le ka hōla joang? kapele hakaalo?
Ho utloisisa hore na ke eng e tsamaisang potoloho ea leqhoa ea Lefatše - tsoelo-pele ea nako le nako ea leqhoa karolong e ka Leboea ea Lefatše - ha se ntho e bonolo, 'me bafuputsi ba entse boiteko bo matla ho hlalosa katoloso le ho fokotseha ha leqhoa le leholo ka lilemo tse likete. Boithuto bona, bo phatlalalitsoeng koranteng ea Nature Geoscience, bo fana ka tlhaloso bakeng sa katoloso e potlakileng ea maqhoa a neng a koahela karolo e kholo ea Lefatše la Leboea nakong ea mehla ea leqhoa ea morao-rao, 'me liphuputso li ka sebetsa le linakong tse ling tsa leqhoa ho pholletsa le nalane ea Lefatše.
Hoo e ka bang lilemong tse 100,000 10,000 tse fetileng, ha liphoofolo tse khōlōhali li ne li solla Lefatšeng, Karolo ea Lefatše e ka Leboea ea leholimo e ile ea theohela lehoatateng le tebileng hoo leqhoa le ileng la etsa hore ho be le leqhoa le leholo. Nakong ea lilemo tse ka bang XNUMX XNUMX, maqhoa a leqhoa a sebakeng seo a ile a hōla ’me a etsa leqhoa le leholo le koahelang karolo e khōlō ea kajeno ea Canada, Siberia le Europe leboea.
Le hoja ho ’nile ha amoheloa ka bophara hore “ho sisinyeha” ha nako le nako ho potoloha ha Lefatše ho potoloha letsatsi ho ile ha etsa hore ho be le serame karolong e ka Leboea ea Lefatše e ileng ea baka ho qhoma ha leqhoa le atileng, bo-rasaense ba ’nile ba thatafalloa ke ho hlalosa leqhoa le koahelang boholo ba Scandinavia le Europe leboea. moo mocheso o leng bobebe haholo.
Ho fapana le Canadian Arctic Archipelago e batang moo leqhoa le bang teng habonolo, Scandinavia e ne e lokela ho lula e se na leqhoa ka lebaka la North Atlantic Current, e tlisang metsi a futhumetseng mabōpong a leboea-bophirimela ho Europe. Le hoja libaka tsena tse peli li le libakeng tse tšoanang tsa latitudes, mocheso oa lehlabula oa Scandinavia o ka holimo ho leqhoa, ha thempereichara likarolong tse kholo tsa Arctic ea Canada e lula e le ka tlas'a leqhoa ho pholletsa le lehlabula, ho latela bafuputsi. Ka lebaka la ho se tšoane hona, mehlala ea boemo ba leholimo e 'nile ea thatafalloa ho ikarabella bakeng sa leqhoa le leholo le ileng la tsoela pele karolong e ka leboea ea Europe 'me le tšoaea qaleho ea mehla ea ho qetela ea leqhoa, ho boletse mongoli ea ka sehloohong oa phuputso eo, Marcus Lofverstrom.
"Bothata ke hore ha re tsebe hore na liqhomane tseo (tse Scandinavia) li tsoa hokae le hore na ke eng e entseng hore li atolohe ka nako e khutšoane hakana," ho boletse Lofverstrom, motlatsi oa moprofesa oa thuto ea mahlale le hlooho ea UArizona Earth System Dynamics. Lab.
Ho fumana likarabo, Lofverstrom o ile a thusa ho theha mohlala o rarahaneng oa Earth-system, o tsejoang ka hore ke Community Earth System Model, e ileng ea lumella sehlopha sa hae ho bopa maemo a neng a le teng qalong ea nako ea morao tjena ea leqhoa. Ka ho hlakileng, o ile a atolosa sebaka sa mohlala oa leqhoa ho tloha Greenland ho akaretsa boholo ba Lefatše la Leboea ka boitsebiso bo phahameng ba sebaka.
Ba sebelisa tlhophiso ena e ntlafalitsoeng ea mohlala, bafuputsi ba ile ba supa menyako ea leoatle sebakeng sa Canadian Arctic Archipelago e le sebaka se bohlokoa se laolang boemo ba leholimo ba North Atlantic mme qetellong ba etsa qeto ea hore na leqhoa le ka hola Scandinavia kapa che.
Lipapiso li senotse hore ha feela liheke tsa leoatle tsa Canadian Arctic Archipelago li ntse li bulehile, tlhophiso ea orbital ea Lefatše e ile ea pholisa Karolo e ka Leboea ea Lefatše ka mokhoa o lekaneng ho lumella leqhoa hore le ahe Northern Canada le Siberia, empa eseng Scandinavia.
Tekong ea bobeli, bafuputsi ba ile ba etsisa boemo bo neng bo e-s'o bonoe moo leqhoa la leoatleng le neng le thibile litsela tsa metsi Sehlekehlekeng sa Canadian Arctic Archipelago. Tekong eo, metsi a batlang a le macha a Arctic le North Pacific - a atisang ho feta Canadian Arctic Archipelago - a ile a khelosoa ka bochabela ho Greenland, moo metsi a tebileng a hlahang hangata. Phetoho ena e lebisitse ho pholiso le ho fokolisa ho potoloha ha botebo ba Leoatle la Atlantic, katoloso ea leqhoa la leoatleng, le maemo a pholileng a Scandinavia.
Lofverstrom o itse: "Re sebelisa lipapiso tsa boemo ba leholimo le ho hlahloba matsoapo a leoatleng, re bonts'a hore leqhoa le ka leboea la Canada le ka sitisa likeiti tsa leoatle le ho khelosa lipalangoang tsa metsi ho tloha Arctic ho ea North Atlantic," ho boletse Lofverstrom, "'me seo se lebisa ho fokotseheng ho potoloha ha leoatle. le maemo a batang a haufi le lebōpo la Scandinavia, a lekaneng ho qala ho mela leqhoa sebakeng seo.”
Diane Thompson, motlatsi oa moprofesa Lefapheng la UArizona la Geoscience, Diane Thompson o itse: "Litlaleho tsa seretse li boetse li bontša bopaki bo matla ba ho potoloha ha metsi a tebileng a leoatle pele ho qhoma ha leqhoa Scandinavia, ho tšoana le liphetho tsa rona tsa mohlala."
Hammoho, liteko li fana ka maikutlo a hore ho thehoa ha leqhoa la leoatle karolong e ka leboea ea Canada e ka 'na ea e-ba selelekela se hlokahalang sa glaciation ea Scandinavia, bangoli ba ngola.
Ho sutumelletsa mehlala ea boemo ba leholimo ho feta ts'ebeliso ea bona ea setso ea ho bolela esale pele maemo a leholimo a tlang ho fana ka monyetla oa ho tseba litšebelisano tse neng li sa tsejoe nakong e fetileng tsamaisong ea Lefatše, joalo ka tšebelisano e rarahaneng le ka linako tse ling e hanyetsanang pakeng tsa leqhoa le boemo ba leholimo, Lofverstrom o itse.
O ile a re: "Ho ka etsahala hore mekhoa eo re e khethileng mona e sebetsa nakong e 'ngoe le e 'ngoe ea leqhoa, eseng feela ea morao tjena. E ka ba ea thusa ho hlalosa linako tse batang tsa nakoana tse kang ho fetoha ha serame sa Younger Dryas (lilemong tse 12,900 11,700 ho ea ho tse XNUMX XNUMX tse fetileng) tse ileng tsa tšoaea ho futhumala ho akaretsang qetellong ea mehla ea leqhoa e fetileng.”
Thuto e hatisitsoeng qalong ka Tlhaho ea Geoscience. Phuptjane 09, 2022.
