Hoto - Hoton hoto
Arctic kankara ya narke, kuma yana yin hakan da sauri wanda zai iya ɓacewa gaba ɗaya cikin morean shekaru kaɗan. Kuma, yayin da duniya ke dumama, dusar kankara da ke yawo a kan Tekun Arctic da tekun da ke kewaye da ita ba zai iya ci gaba da wanzuwa ba.
Har zuwa yanzu mun san cewa ƙanƙarar kankara, wato, kankara wacce ba ta da yearsan shekaru kaɗan, ta narke cikin sauƙi a lokacin zafi mai zafi. Amma rashin alheri, shima tsohon ice din yana bacewa.
Matakan kankara na tekun Arctic bai cika ba, saboda haka masu binciken NASA sun yi amfani da hanyar da Jami'ar Colorado (Amurka) ta kirkira wanda zai basu damar samun cikakkiyar fahimta game da yadda tsarin ya samo asali na kankara daga 1984 har zuwa yanzu, tun iya auna gwargwadon yanayin zafi, gishiri, laushi da murfin dusar ƙanƙara wanda ya dogara kan kankara godiya ga kayan aikin tauraron dan adam mai amfani da tauraron dan adam.
Don haka, sun ƙirƙira rayarwa wanda ke nuna yadda kankara ke girma da kwantiragi a cikin shekaru 32 da suka gabata.
Babu irin adadin kankara. Kowace shekara, yana ƙaruwa a lokacin sanyi kuma yana raguwa a lokacin bazara. Wannan al'ada ce. Kankarar da ke rayuwa a lokacin hunturu tana yin kauri yayin da lokaci ya wuce, tana iya girma tsakanin mita 1 zuwa 3 a farkon shekarun, kuma tsakanin mita 3 zuwa 4 lokacin da suke "tsohuwar kankara". Wadannan na ƙarshe, saboda haka, sun fi jure tasirin tasirin raƙuman ruwa ko hadari; Koyaya, ba abin da ke kare su daga hauhawar yanayin zafi.
Walt Meier, wani mai bincike a NASA Goddard Center a Maryland, Amurka, ya fadi haka yawancin tsofaffin kankara sun ɓace, kuma kara da cewa:
A cikin 1980 yadudduka na shekaru masu yawa sun kasance sama da 20% na murfin kankara. A yau kawai sun isa 3%.
Idan yanayin bai canza ba, da alama Arctic zai sami rani mara kankara nan da nan.