Wani dutsen kankara mai girman Manhattan sau biyu ya balle daga babban dutsen Petermann Glacier na Greenland, wanda zai iya hanzarta tafiyar kankara zuwa cikin ruwan arewacin kasar, in ji masana kimiyya a ranar Laraba.
Wannan shi ne karo na biyu a cikin kasa da shekaru biyu da Petermann Glacier ya haifar da wani babban tsibirin kankara. A cikin 2010, ta sake sake sake wani babban dusar ƙanƙara a cikin teku.
Tauraron dan Adam na Aqua na NASA ya lura da hutun na baya-bayan nan, wanda ke wucewa ta Arewa Pole sau da yawa a rana, kuma Trudy Wohlleben na Hukumar Kula da Kankara ta Kanada ta lura da shi.
"A wannan lokacin na shekara, koyaushe muna kallon Petermann Glacier," in ji Wohlleben, saboda yana iya haifar da manyan kankara da ke mamaye hanyoyin jiragen ruwa na Arewacin Atlantic ko dandamalin mai a Grand Banks na Newfoundland. Wani babban yanki na dutsen kankara na 2010 ya yi haka, amma bai haifar da lalacewa ba, in ji ta ta wayar tarho.
Hotunan NASA sun nuna yadda dusar kankara ke kisfewa - ta tashi daga wani kogin kankara da ke shawagi da ake kira harshen kankara, wani bangare na ginshikin Petermann Glacier da ke karkashin kasa - kuma yana gangarowa a karkashin wani ruwa na fjord a gabar tekun Greenland ta arewa maso yammacin kasar. An gano wata baraka a cikin kankara a shekara ta 2001, amma a ranar litinin an samu tsaga.
A ranar Talata, tauraron dan adam ya leka babbar tazara tsakanin glacier da tsaunin kankara, kuma dusar kankarar da ke gaba da gaba tana watsewa, in ji NASA ta yanar gizo.
A cikin wata sanarwa da Eric Rignot na NASA's Jet Propulsion Laboratory ya fitar, ya ce "tsawaita kan ruwa [na glacier] yana watsewa. "Ba rushewa bane, amma tabbas lamari ne mai mahimmanci."
Bambanci daya tsakanin taron na 2010 da wannan shine tsibirin kankara na yanzu ya barke zuwa sama, inda kankara ya yi daidai da ganuwar gefen dutsen fjord, yana lalata motsin tekun glacier.
Andreas Muenchow, wani masanin teku na Arctic ya ce "Wannan yanki da ya dade da yawa, watakila ya kasance yana samar da karin karfi don yin togi (kankara) sama da abin da ya barke a shekarar 2010, wanda ya yi fice sosai," in ji Andreas Muenchow, wani masanin teku na Arctic. a Jami'ar Delaware.
Hutun na 2010 ya kara habaka yunkurin Petermann Glacier zuwa teku da kashi 10 zuwa kashi 20 cikin dari, in ji Muenchow ta wayar tarho. Hutun na yanzu zai iya yin tasiri sosai akan motsin glacier.
Dusar kankara na bakin teku irin wannan harshe mai iyo kan kankara kan hana kwararar kankarar da ke kan tekun. Lokacin da dusar ƙanƙara ta fashe, glaciers na ƙasar da ke bayansu galibi suna motsawa cikin sauri, in ji Muenchow.
Motsin wannan ƙanƙara mai yawan gaske zuwa buɗaɗɗen ruwa ba zai yi tasiri nan da nan kan matakan teku ba, tun da tuni wannan ƙanƙara ta kasance wani ɓangare na wani rumbun ƙanƙara da aka makala a ƙasa amma an shimfiɗa shi a kan ruwa, kamar yadda ice cube ɗin ke narkewa a cikin gilashin. ruwa baya ɗaga matakin ruwa a cikin gilashin.
Muenchow ya ce sauyin yanayi shi ne wani abu a halin da ake ciki na glacier na Petermann. Ya ce wannan dusar kankara ta koma kan kasa kamar yadda ake yi tun farkon juyin juya halin masana'antu sama da shekaru 150 da suka gabata.
WASHINGTON – Reuters
