Sezvatinoziva, shanduko yemamiriro ekunze iri kukurumidza uye kumhanya kunoita kuti mapango adzokorore zvakare. Boka renyika dzakawanda revatsvakurudzi rakagadzirazve nhoroondo ichangopfuura yekudziya kwegungwa pagedhi reActic Ocean munharaunda inonzi Fram Strait, pakati peGreenland neSvalbard. Vachishandisa masiginecha emakemikari anowanikwa muzvipembenene zvemugungwa, vaongorori vakawana kuti Arctic Ocean yakatanga kudziya nekukurumidza pakutanga kwezana ramakore rapfuura sezvo mvura inodziya uye ine munyu yaiyerera kubva kuAtlantic, chiitiko chinonzi. Atlantisation, uye kuti kuchinja uku kungangodaro kwakatangira kudziya.
Muchinyorwa chino tichakuudza zvese nezve tsvakiridzo yekunyungudika kwematanda.
Investigation
Chikwata chevaongorori vepasi rese chakavakazve nhoroondo ichangoburwa yekudziya kwegungwa pamusuwo weArctic Ocean muFram Strait pakati peGreenland neSvalbard. Vatsvakurudzi vakashandisa masiginecha emakemikari anowanikwa mumakungwa emugungwa ndokuona kuti Arctic Ocean yakatanga kudziya nekukurumidza sezvo mvura yegungwa inodziya, ine munyu yaiyerera ichibuda muAtlantic Ocean kutanga kwezana ramakore rapfuura. Chiitiko ichi chinonzi Atlantisation. Shanduko iyi yakakosha zvikuru. Kubva 1900, tembiricha yemugungwa yakwira neinosvika 2 madhigirii celsiusnepo aizi yegungwa yadzikira uye munyu wakawedzera.
Mhedzisiro yakaburitswa mujenari "Science Advances" inopa yekutanga nhoroondo yekuona nezve Atlanticization yeArctic Ocean uye inoratidza kuti kubatana neNorth Atlantic kwakasimba kupfuura zvaimbofungwa.
Kubatana uku kunogona kuumba shanduko yemamiriro ekunze eArctic, uye sezvo mazaya echando ari kuramba achinyunguduka, izvi zvinogona kukanganisa zvikuru aizi yegungwa iri kupera uye kukwira kwemakungwa epasirese. Nekuda kwekushanduka kwemamiriro ekunze, makungwa ose enyika ari kudziya, Asi Arctic Ocean ndiyo gungwa diki uye risina kudzika pasi rose, iro rinodziya zvakanyanya.
Atlantisation
Nekuda kwemaitiro emhinduro, mwero wekudziya weArctic unodarika zvakapetwa kaviri paavhareji yenyika. Zvichienderana nezviyero zvesetiraiti, tinoziva kuti Arctic Ocean yanga ichidziya zvishoma nezvishoma, kunyanya mumakore makumi maviri apfuura, asi isu tinoda kuisa kudziya kwemazuva ano munzvimbo yakafara. Atlantisation chimwe chezvikonzero zvekudziya kweArctic, asi zvinyorwa zvezviridzwa zvinokwanisa kuongorora izvi, zvakadai semasetiraiti, zvinongogara makore makumi mana apfuura. Sezvo Arctic Ocean inodziya, ichaita kuti chando chiri munzvimbo dzepasi rinyunguduke, izvo zvinozokanganisa huwandu hwegungwa repasi rose.
Nekuda kwemaitiro emhinduro, mwero wekudziya muArctic unodarika kaviri avhareji yepasi rose. Zvichienderana nezviyero zvesatellite, tinoziva kuti gungwa parinonyunguduka, rinoisa pachena nzvimbo yegungwa kuzuva, kuburitsa kupisa uye kuwedzera tembiricha yemhepo. Sezvo Arctic inoramba ichidziya, ichanyungudutsa permafrost, Inochengeta methane yakawanda, gasi regreenhouse rinokuvadza kupfuura carbon dioxide. Vatsvakurudzi vakashandisa geochemical uye ecological data kubva mumvura yegungwa kuti vagadzirisezve shanduko muzvinhu zvegungwa remvura mumvura mumakore 800 apfuura.
Tinovimba tichine nguva yekumisa shanduko yemamiriro ekunze.