Asayansi ku Institute for Marine Research ku Tromsø, Norway, apeza kusintha kwanyengo mofulumira komanso modabwitsa kumpoto kwa Barents Sea. Malinga ndi ochita kafukufuku, dera lino likuwonongeka chifukwa cha nyanja ya Arctic ndipo posakhalitsa likhala gawo la nyengo ya Atlantic. Komanso, izi zitha kusokoneza chilengedwe chomwe nyama zomwe zimadalira ayezi zimakhala ndikuwedza malonda. Nkhani ya asayansi idasindikizidwa mu nyuzipepala ya Nature Climate Change.
Nyanja ya Barents ili ndi zigawo ziwiri zomwe zimakhala ndi nyengo zosiyanasiyana. Kumpoto kuli nyengo yozizira komanso malo okhala ndi ayezi, pomwe kum'mwera kumayang'aniridwa ndi Atlantic. Kulekanaku kumachitika chifukwa chakuti madzi ofunda ndi amchere a Atlantic amalowa gawo limodzi la nyanja, pomwe enawo amakhala ndi madzi ozizira komanso ozizira a ku Arctic, omwe chaka chilichonse amakakamizidwa ndi omwe kale anali kubwerera kumpoto.
Asayansi akukhulupirira kuti gawo lalikulu pantchitoyi limaseweredwa ndi kusokonekera kwa kusanjika kwa madzi chifukwa chakuchepa kwa madzi abwino omwe amalowa munyanja nthawi yayikulu ikasungunuka. Pazizolowezi zonse, madzi oundana akasungunuka, nyanja yamadzi imalandira madzi ozizira abwino, zomwe zimapangitsa kuti madzi oundana atsopano apange nyengo yozizira yotsatira. Madzi oundana omwewo amateteza malo osanjikiza a Arctic kuti asakhudzidwe ndi mlengalenga, komanso amalipira mphamvu yakuya kwa nyanja ya Atlantic, ndikukhalabe ndi stratification.
Ngati mulibe madzi osungunuka okwanira, stratification imayamba kusokonezedwa, ndipo kutentha ndi kuwonjezeka kwa mchere m'mbali yonse yamadzi kumayambitsa mayankho abwino omwe amachepetsa chivundikiro cha ayezi ndipo, moyenera, zimathandizira kusintha kwakukulu pakukhazikika kwa zigawo, kulola kuti madzi ofunda akwere kwambiri ndikukwera. Asayansi akutchula kuchepa kwakukulu kwa madzi oundana ku Arctic chifukwa cha kutentha kwanyengo monga chifukwa chotsika kwamadzi osungunuka.
Ofufuzawo akuti kutha kwa madzi osungunuka kwatsopano kunayambitsa zochitika zingapo zomwe pamapeto pake zidapangitsa kuti pakhale "malo otentha" ku Arctic. Nthawi yomweyo, kusinthaku sikungasinthike, ndipo Nyanja ya Barents posachedwa idzakhala gawo la nyengo ya Atlantic. Kusintha kumeneku kunachitika kokha m'zaka zapitazi za ayezi.
