Gilashin Pine Island, wanda ke kan Antarctic Glacier, yana ɗaya daga cikin ƙarancin kankara biyu da ba su da ƙarfi. Ita ce babbar madatsar ruwan kankara a yankin, kuma wannan Satumba 23 ta sha wahala mai girma. 267 murabba'in kilomita na fili an ware, kusan sau 4 girman Manhattan. A cewar Stef Lhermitte, farfesa a Geoscience da Remote Measurement a Delft Technical University, Netherlands, babban dutsen kankara ya bayyana daga baya ya fada cikin tsibiran kankara da yawa bayan an bi ta cikin Tekun Antarctic.
Lamarin ya faru ne sakamakon rushewar cikin gida a cikin kankara. Tsibirin Pine yana daya daga cikin kankara biyu da masu bincike suka ce sun fi saurin fuskantar saurin lalacewa, suna kawo karin kankara daga cikin layin zuwa tekun. A kowace shekara kankarar kan yi asarar tan miliyan 45.000 na kankara. Tun daga 2009, akwai masu riga manyan zaftarewar kasa biyu na wannan kankara. Daya a 2013 daya kuma a 2015. Hakanan yana da alhakin kwata na jimlar narkewar Antarctica.
Me zaku iya tsammanin daga duk wannan narkewar?
Tsawon watanni, masu bincike sun riga sun yi gargadi game da hadarin zaftarewar kasa kamar wacce ta faru. Narkewar kankirin zai iya ambaliya a bakin iyakar duniya. Ganin cewa Kudancin Kudu, Antarctic, ya ƙunshi kashi 90% na kankara a duniyaBaya ga kashi 70% na "tsaftataccen ruwa" na Duniya, an kiyasta hakan cikakken narkewar sa zai daga matakin teku zuwa mita 61. Ba lallai ba ne a faɗi, wannan zai zama bala'i.
Ba zai iya faruwa dare ɗaya ba. Sauƙin yana zama a hankali amma yana ci gaba, ba ya tsayawa. A duk tsawon shekara, a lokacin sanyi yana daskarewa, kuma a lokacin dumi yakan narke. Matsalar ita ce yana narkewa fiye da kankarar da yake samarwa, kuma baya barin zuwa kari, yana barin mana abubuwa kamar labarai a kusa. Gaskiyar ita ce, dumamar yanayi tana shafar kai tsaye, kuma duk da cewa matsakaita zafin yankin na Antarctic shine -37ºC, narkewar ba wai kawai a hankali bane, yana ci gaba sosai.
Fiye da ma'anar cewa wannan na iya zama a cikin hawan matakin teku, ba ya ƙare a nan. Zai gyara canjin ruwa na tekun, yana shafar abin da aka sani da "igiyar jigilar teku."
Belin jigilar teku yana cikin hadari
Wannan babban bel din shine babban halin yanzu na ruwan tekun da yana aiwatar da sake rarraba yanayin zafi. Ruwan sanyi yana zuwa mahaɗan mahaɗa, inda yake dumama. Mafi girman yanayin zafin jiki, ƙarancin nauyin da yake da shi kuma mafi girma ruwan yana gudana a cikin wannan rafin. Theananan zafin jiki, ƙananan yana tafiya. Wannan canjin yanayin yanayin yana taimakawa rayuwa a cikin tekuna, da kuma cewa wasu yankuna na ƙasa zasu iya jin daɗin wasu yanayi.
Tare da jimlar narkewar sandunan, belin masu jigilar teku ya baceceria. Za a shafar igiyar ruwa, har ma da iskoki. Ofaya daga cikin sakamakon farko da zai faru idan ya tsaya, zai kasance ganin yadda murjani yake mutuwa. Mahimmancin da suke da shi a cikin manyan halittu na ruwa zai haifar da mummunan tasiri ga rayuwa. Zai zama sakamakon tasirin domino, tunda murjani shine asalin rayuwa ga wasu kwayoyin halitta, har ma da alaƙa da wasu kwayoyin. Yankin da suke da shi na daidaitawa zuwa canje-canje a yanayin ƙanƙan kadan. Don haka mazaunin sa a koyaushe suna juyawa tsakanin zafin ruwan aƙalla 20ºC da matsakaicin 30ºC.
Ba zai zama karo na farko da hakan ta faru ba, kuma a nan ne ake bude mahawara da yawa game da shin tasirin ɗumamar yanayi da mutum ya haifar, ko kuma na duniyar tamu. Lokaci na karshe da aka sami bayanan wannan lamarin shine shekaru 13.000 da suka gabata. A ƙarshe, yana iya zama duniyar ta zagayowar kanta kuma ɗan adam ya haɓaka shi, yana barin alamarsa. Koyaya, wani abu sananne shine cewa ɗan adam yana shafar duk duniya. Akwai ƙananan tattaunawa kaɗan a fuskar shaidu da yawa.