Madzi oundana owirikiza kawiri kukula kwa Manhattan adachoka ku Greenland Glacier yayikulu ya Petermann, yomwe imatha kufulumizitsa kuyenda kwa ayezi kupita kumadzi akumpoto, asayansi adatero Lachitatu.
Aka ndi kachiŵiri pasanathe zaka ziwiri kuti madzi oundana a Petermann Glacier abereke chilumba choopsa kwambiri cha ayezi. Mu 2010, idatulutsa madzi ena oundana m'nyanja.
Kupuma kwaposachedwa kudawonedwa ndi satellite ya NASA ya Aqua, yomwe imadutsa kumpoto kwa North Pole kangapo patsiku, ndipo adadziwika ndi Trudy Wohlleben wa Canadian Ice Service.
"Panthawi ino ya chaka, nthawi zonse timayang'ana glacier ya Petermann," adatero Wohlleben, chifukwa imatha kutulutsa madzi oundana omwe amafika ku North Atlantic zombo kapena nsanja zamafuta ku Grand Banks ku Newfoundland. Chidutswa chachikulu cha iceberg cha 2010 chinachita zomwezo, koma sichinawononge, adatero pafoni.
Zithunzi za NASA zidawonetsa kuphulika kwa madzi oundana - kuchoka pamtsinje wa ayezi woyandama wotchedwa ice tongue, gawo la Petermann Glacier wokhazikika pamtunda - ndikusunthira kumunsi kwa fjord kumpoto chakumadzulo kwa Greenland. Mu 2001, mu XNUMX munali ng'anjo ya madzi oundana, koma Lolemba kunaoneka kuti panali mng'alu.
Lachiwiri, satellite idawona kusiyana kwakukulu pakati pa madzi oundana ndi madzi oundana, ndipo madzi oundana omwe anali kumunsi kwa mtsinjewo akusweka, NASA idatero pa intaneti.
"Kukulitsa koyandama [kwa madzi oundana] kukusweka," Eric Rignot wa Jet Propulsion Laboratory ya NASA adatero m'mawu ake. "Sikugwa, koma ndi chochitika chofunikira kwambiri."
Kusiyana kumodzi pakati pa chochitika cha 2010 ndi ichi ndikuti chilumba cha ayezi chomwe chilipo pano chidasweka kumtunda, pomwe ayezi adakwera molunjika pamakoma am'mbali mwa miyala ya fjord, ndikusokoneza kuyenda kwa nyanja ya glacier.
Andreas Muenchow, katswiri wa zanyanja za Arctic, anati: "Chidutswachi chomwe chakhala chikuyenda motalikirapo, mwina chinali kupereka mphamvu yochulukirapo kuti iwononge [madzi oundana] kuposa momwe idasweka mu 2010, yomwe idasokonekera kwambiri," atero a Andreas Muenchow, katswiri wa zanyanja zaku Arctic. ku yunivesite ya Delaware.
Kupuma kwa 2010 kunathandizira kuyenda kwa Petermann Glacier kupita kunyanja ndi 10 peresenti mpaka 20 peresenti, Muenchow adatero pafoni. Kupuma kwapano kungakhudze kwambiri kuyenda kwa madzi oundana.
Madzi oundana a m’mphepete mwa nyanja monga lilime la ayezi loyandamali amakonda kutsekereza madzi oundana opita kunyanja. Madzi oundana akasweka, madzi oundana omwe amakhala kumbuyo kwawo nthawi zambiri amayenda mwachangu, adatero Muenchow.
Kuyenda kwa madzi oundana ochuluka ameneŵa m’madzi otseguka sikudzakhudzanso madzi a m’nyanja, popeza kuti madzi oundana ameneŵa anali kale mbali ya madzi oundana amene anamangiriridwa kumtunda koma amatambasulidwa pamwamba pa madzi, monga momwe madzi oundana amasungunuka m’kapu ya madzi oundana. madzi sakweza mlingo wa madzi mu galasi.
Muenchow adati kusintha kwanyengo ndizomwe zidapangitsa kuti nyanjayi ya Petermann Glacier ikhalepo. Ananenanso kuti madzi oundanawa ali kutali kwambiri ndi dziko monga momwe zakhalira kuyambira chiyambi cha Industrial Revolution zaka 150 zapitazo.
WASHINGTON - Reuters
