Masayendisiti akawana nzvimbo yakakura, isina kuongororwa yezvikomo nemipata yakaumbwa nenzizi dzekare pasi peAntarctic ice, yakaomeswa nechando kwemamiriyoni emakore. Iyi nzvimbo yakavanzika, yakakura kupfuura Bherujiyamu, yanga isina kukanganiswa kwemakore anopfuura mamirioni makumi matatu nemana asi inotarisana nenjodzi yekufumurwa nekuda kwe kudziya kwepasi kunokonzerwa nevanhu, maererano nevatsvakurudzi veBritain neAmerica.
Stewart Jamieson, nyanzvi yeglaciologist kubva kuDurham University, akasimbisa kuti iyi inzvimbo isina kumboonekwa isina munhu akamboona.
"Chinofadza ndechekuti yanga yakavanda ipapo pachena," Jamieson akawedzera, achisimbisa kuti vaongorori vanga vasina kushandisa data nyowani, nzira nyowani. Ivhu riri pasi peEast Antarctic Ice Sheet harizivikanwi zvakanyanya kupfuura pamusoro peMars, akadaro Jamieson.
Kuongorora nzvimbo yakavanzika pasi peAntarctic ice kwemamiriyoni emakore, masayendisiti anowanzo shandisa radio-echo kurira, uko ndege dzinotumira masaisai eredhiyo muchando uye kuongorora maungira. Nekudaro, kuvhara nzvimbo yakakura yeAntarctica neiyi nzira idambudziko rakakura. Pane kudaro, vatsvakurudzi vakashandisa mifananidzo yesatellite kuti vaone mipata nemipata iri pasi peaizi anopfuura makiromita maviri. I "undulating" ice surface inoshanda se "ghost image" inovanza izvi zvakasiyana siyana pasi payo.
Nekubatanidza mifananidzo yesatellite neredhiyo-echo inonzwika data, vesainzi vakaburitsa nzvimbo ine mipata yakadzika yakaita nzizi uye zvikomo zvine mawere, zvakafanana nezvimwe zviri pamusoro pePasi.
Stewart Jamieson akafananidza nzvimbo ichangobva kuwanikwa iri pasi peaizi yeAntarctic nekutarira nepahwindo rendege munzvimbo ine makomo, yakafanana nenharaunda yekuchamhembe kweWales yeSnowdonia. Iyi nzvimbo yakakura 32,000 square kilometer yaimbogarwa nemiti, masango, uye zvimwe mhuka dzakasiyana-siyana.
'Asi chando chakauya, uye chaive"chando nenguva"', Jamieson akadaro.
Nguva chaiyo kubva chiedza chezuva chakasvika munzvimbo yakavanda iyi yakaoma kuziva, asi masayendisiti ane chokwadi chine musoro kuti angangoita makore mamirioni gumi nemana. Fungidziro yakadzidza yaStewart Jamieson ndeyekuti yakapedzisira kuburitswa makore anopfuura mamirioni makumi matatu nemana apfuura apo Antarctica yakatanga kuoma nechando.
Pamusoro pekuwanikwa uku, vamwe vevaongorori vakambowana dziva rakakura seguta riri pasi peaizi yeAntarctic. Vanofunga kuti panogona kunge paine dzimwe nzvimbo dzekare dzakamirira kuti dzifukurwe.
Vanyori veongororo iyi vakaratidza kushushikana kuti kudziya kwepasi kunogona kukanganisa nyika ichangobva kuburitswa, sezvo mamiriro ezvinhu ari kuitika kune aivepo makore gumi nemana kusvika makumi matatu nemana emakore apfuura apo tembiricha yaidziya madhigirii matatu kusvika manomwe pane nhasi. Nekudaro, zvakakosha kuziva kuti nzvimbo iyi inowanikwa mazana emakiromita mukati menyika kubva kumucheto kweaizi, saka chero mukana wekuratidzwa chinhu chiri kure.
Nzvimbo ichangobva kuwanikwa iri mazana emakiromita mukati menyika kubva kumucheto kweaizi, zvichireva kuti chero kuratidzwa kuri kure. Pasinei nezviitiko zvekudziya zvakapfuura, senguva yePliocene makore 3 kusvika ku4.5 mamiriyoni apfuura, kwete kukonzera kuratidzwa, kune tariro. Nekudaro, hazvina chokwadi kana "itiziro yekuita" yekunyungudika, kana iripo, inogona kuitika, maererano naJamieson.
Ongororo iyi yakaburitswa nguva pfupi yadarika mushure mekunge vesainzi vapa yambiro yekuti kunyungudika kweiyo West Antarctic Ice Sheet kunotarisirwa kukurumidza zvikuru mumakumi emakore ari kuuya, kunyangwe kuedza kwepasirese kuderedza kudziya kwepasi kwakabudirira.
Iyo West Antarctic Ice Sheet (WAIS) ndeimwe yemaaizi makuru maviri muAntarctica, imwe yacho iri East Antarctic Ice Sheet.
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