Puas yog cov yau qhuav qhuav los ntawm dej nyab?

Cov txheej txheem:

Puas yog cov yau qhuav qhuav los ntawm dej nyab?
Puas yog cov yau qhuav qhuav los ntawm dej nyab?
Anonim

Zoo ntseeg tias qhov xwm txheej txias no tau tshwm sim los ntawm dej nyab ntawm cov dej tshiab uas tau nchuav rau sab qaum teb Atlantic (1) thiab cuam tshuam cov dej hiav txwv thermohaline (2).

Dab tsi ua rau tus Hluas Dryas?

Ua li cas rau Cov Hluas Dryas? Cov Hluas Dryas tau tshwm sim thaum lub sijhawm hloov pauv los ntawm lub sijhawm glacial kawg mus rau tam sim no interglacial (lub Holocene). Lub sijhawm no, North American, lossis Laurentide, daim ntawv dej khov tau nrawm nrawm thiab ntxiv dej tshiab rau dej hiav txwv.

Tus Hluas Dryas yog dab tsi thiab nws tshwm sim thaum twg?

Younger Dryas, tseem hu ua Younger Dryas stadial, lub sijhawm txias nruab nrab kwv yees li 12, 900 thiab 11, 600 xyoo dhau los uas cuam tshuam qhov kev kub ntxhov tshwm sim nyob rau sab qaum teb Hemisphere ntawm kawg ntawm Pleistocene Epoch (uas tau kav txij li 2.6 lab mus rau 11, 700 xyoo dhau los).

Yawg Dryas phem npaum li cas?

Qee cov kws tshawb fawb tau hais tias qhov xwm txheej no ua rau muaj kev kub ntxhov ntawm biomass, lub caij ntuj no luv luv thiab Cov Hluas Dryas hloov pauv huab cua sai sai, pab txhawb rau extinctions ntawm Pleistocene megafauna lig, thiab ua rau kawg ntawm Clovis kab lis kev cai. …

Tus Hluas Dryas txias npaum li cas?

Nws qhov kawg tau raug suav tias tau tshwm sim dhau ib xyoo caum lossis yog li ntawd, tab sis qhov pib yuav tau sai dua. Thermally fractionated nitrogen thiab argon isotope cov ntaub ntawv los ntawmGreenland ice core GISP2 qhia tias nws qhov ua siab tshaj yogncig 15 ° C (27 ° F) txias duathaum lub sij hawm Younger Dryas dua hnub no.

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