Peb tuaj yeem tau txais txiaj ntsig kev koom tes thaum koj yuav los ntawm kev sib txuas ntawm peb lub xaib.Nov yog qhov nws ua haujlwm li cas.
Ib txoj kev tshawb fawb tshiab tau qhia tias North Ncej tab tom tig mus rau Siberia los ntawm nws lub tsev ib txwm nyob hauv Canadian Arctic raws li ob pawg loj loj zais hauv qab hauv qab ntawm lub hauv paus-mantle ciam teb koom nrog kev sib ntaus sib tua.
Cov chaw no, thaj chaw ntawm qhov tsis zoo ntawm cov hlau nplaum tam sim no nyob rau hauv Canada thiab Siberia, tau koom nrog hauv kev sib tw yeej-tau-tag nrho kev sib ntaus.Raws li cov tee hloov cov duab thiab lub zog ntawm cov hlau nplaum, muaj tus yeej;Cov kws tshawb fawb tau pom tias thaum cov dej loj hauv Canada tsis muaj zog los ntawm 1999 txog 2019, cov dej hauv qab Siberia tau nce me ntsis los ntawm 1999 txog 2019. "Ua ke, cov kev hloov pauv no tau ua rau qhov tseeb tias Arctic tau hloov mus rau Siberia," cov kws tshawb fawb sau. hauv kev kawm.
Phil Livermore, tus thawj coj tshawb fawb thiab tus pab xibfwb ntawm geophysics ntawm University of Leeds hauv tebchaws United Kingdom, hais rau Live Science hauv email.
Thaum cov kws tshawb fawb thawj zaug pom lub North Ncej (qhov twg lub koob lub ntsiab lus) nyob rau hauv 1831, nws nyob rau sab qaum teb Canadian thaj chaw ntawm Nunavut.Cov kws tshawb fawb tsis ntev los no pom tau hais tias sab qaum teb magnetic ncej tended mus, tab sis feem ntau tsis deb heev.Nyob nruab nrab ntawm xyoo 1990 thiab 2005, tus nqi ntawm cov ncej hlau nplaum txav tau dhia ntawm keeb kwm ceev tsis tshaj 9 mais (15 mais) ib xyoos mus rau 37 mais (60 mais) ib xyoos, cov kws tshawb fawb sau hauv lawv txoj kev tshawb fawb.
Thaum Lub Kaum Hli 2017, cov hlau nplaum sab qaum teb hla txoj kab hnub thoob ntiaj teb nyob rau sab hnub tuaj hemisphere, hla hauv 242 mais (390 mais) ntawm thaj chaw sab qaum teb.Ces sab qaum teb magnetic ncej pib txav mus rau sab qab teb.Ntau npaum li cas tau hloov pauv tias xyoo 2019, geologists raug yuam kom tso tawm ib lub xyoo ntxov ntawm cov qauv hlau nplaum tshiab ntawm lub ntiaj teb, ib daim ntawv qhia uas suav nrog txhua yam ntawm lub dav hlau navigation mus rau smartphone GPS.
Ib tug tsuas tuaj yeem kwv yees vim li cas Arctic tawm Canada rau Siberia.Qhov ntawd yog kom txog rau thaum Livermore thiab nws cov npoj yaig pom tau tias kev poob qis yuav raug liam.
Lub magnetic teb yog generated los ntawm cov kua hlau rotating nyob rau hauv lub ntiaj teb no sib sib zog nqus core.Yog li, kev hloov pauv ntawm qhov loj ntawm lub viav vias hlau hloov txoj haujlwm ntawm cov hlau nplaum sab qaum teb.
Txawm li cas los xij, qhov chaw sib nqus tsis txwv rau lub hauv paus.Raws li Livermore, cov kab hluav taws xob sib nqus "bulge" tawm ntawm lub ntiaj teb.Nws hloov tawm tias cov tee no tshwm sim qhov twg cov kab no tshwm sim.Nws tau hais tias "Yog tias koj xav txog cov kab hlau nplaum sib nqus zoo li cov spaghetti mos, cov pob zeb zoo li cov pob zeb spaghetti tawm ntawm lub ntiaj teb," nws hais.
Cov kws tshawb fawb pom tau tias txij li xyoo 1999 txog 2019, ib qho slick nyob rau hauv Canada stretched los ntawm sab hnub tuaj mus rau sab hnub poob thiab faib ua ob lub me me txuas nrog slicks, tej zaum yuav yog vim muaj kev hloov pauv ntawm cov qauv ntawm cov dej ntws tseem ceeb ntawm xyoo 1970 thiab 1999. Ib qho ntawm cov chaw muaj zog tshaj qhov Lwm yam, tab sis tag nrho, qhov elongation "ua rau qhov tsis muaj zog ntawm Canadian qhov chaw ntawm lub ntiaj teb," cov kws tshawb fawb tau sau rau hauv txoj kev tshawb no.
Tsis tas li ntawd, qhov chaw Canadian khaus ntau dua los ze rau Siberian ib qho vim kev sib cais.Qhov no, nyob rau hauv lem, ntxiv dag zog rau lub Siberian chaw, cov kws tshawb fawb sau.
Txawm li cas los xij, ob lub blocks no nyob rau hauv qhov sib npaug me me, yog li "tsuas yog kev hloov kho me me rau qhov kev teeb tsa tam sim no tuaj yeem thim rov qab qhov tam sim no ntawm North Ncej mus rau Siberia," cov kws tshawb fawb sau hauv txoj kev tshawb no.Hauv lwm lo lus, kev thawb mus rau ib qho lossis lwm qhov tuaj yeem xa cov hlau nplaum sab qaum teb rov qab mus rau Canada.
Kev tsim kho dua tshiab ntawm kev sib nqus ncej yav dhau los ntawm North Ncej qhia tau hais tias ob tee, thiab qee zaum peb, tau cuam tshuam txoj haujlwm ntawm North Ncej dhau sijhawm.Tshaj li 400 xyoo dhau los, cov te tau ua rau North Ncej nyob rau sab qaum teb Canada, cov kws tshawb fawb hais tias.
"Tab sis dhau 7,000 xyoo dhau los, [Ntiaj Teb Ncej] zoo li tau tsiv mus nyob ib puag ncig tus ncej geographic tsis pom qhov chaw nyiam," cov kws tshawb fawb tau sau rau hauv txoj kev tshawb fawb.Raws li tus qauv, los ntawm 1300 BC tus ncej kuj hloov mus rau Siberia.
Nws nyuaj rau hais tias yuav muaj dab tsi tshwm sim tom ntej.Livermore tau hais tias "Peb qhov kev kwv yees yog tias cov ncej yuav txuas ntxiv mus rau Siberia, tab sis kev kwv yees yav tom ntej yog qhov nyuaj thiab peb tsis tuaj yeem paub tseeb," Livermore tau hais.
Cov kev kwv yees yuav ua raws li "kev saib xyuas kom meej ntawm geomagnetic teb ntawm lub ntiaj teb saum npoo thiab hauv qhov chaw nyob rau ob peb xyoos tom ntej no," cov kws tshawb fawb tau sau rau hauv kev tshawb fawb luam tawm online May 5 hauv phau ntawv journal Nature Geoscience.
Rau ib lub sijhawm txwv, koj tuaj yeem sau npe rau ib qho ntawm peb cov ntawv xov xwm kev tshawb fawb saum toj kawg nkaus rau tsawg li $ 2.38 ib hlis lossis 45% ntawm tus nqi li niaj zaus rau thawj peb lub hlis.
Laura yog tus editor ntawm Live Science rau archaeology thiab lub neej me ntsis paub tsis meej.Nws kuj qhia txog kev tshawb fawb dav dav, suav nrog paleontology.Nws txoj haujlwm tau nthuav tawm hauv New York Times, Scholastic, Nrov Science, thiab Spectrum, lub vev xaib tshawb fawb txog kev puas hlwb.Nws tau txais ntau yam khoom plig los ntawm Association of Professional Journalists thiab Washington Newspaper Publishers Association rau nws tshaj tawm hauv xov xwm txhua lub lim tiam ze Seattle.Laura tau txais BA hauv Lus Askiv Literature thiab Psychology los ntawm Washington University hauv St. Louis thiab MA hauv Science Writing los ntawm New York University.
Live Science yog ib feem ntawm Future US Inc, ib pawg xov xwm thoob ntiaj teb thiab cov tshaj tawm digital.Mus saib peb lub vev xaib tuam txhab.