Isithombe - I-Twitter / David App
Izinto ziyenzeka e-Antarctica okuthi, yize zingokwemvelo ngokuphelele, njengoba ukuguquka kwesimo sezulu kuyinto eyenzekayo abantu aba yimbi ngenxa yendlela abaphatha ngayo iplanethi yoMhlaba, yimicimbi esikhathazayo.
Izindaba zakamuva ukutholakala komgodi omkhulu ngasogwini loLwandle i-Weddell e-Antarctica okumangele ososayensi.
Izindawo zamanzi avulekile njengalezo ezitholakele, zizungezwe iqhwa lolwandle, zakha ezifundeni ezisogwini lwe-Antarctica nase-Arctic. I-polynyas eyaziwayo ingavela ngezindlela ezimbili: ngenqubo ye-thermodynamic, okwenzeka lapho izinga lokushisa lamanzi lingafiki lapho iqhwa liqhuma khona; kungaba isenzo somoya katabatic noma imisinga yolwandle, asusa iqhwa emngceleni ohleliwe weqhwa elihlala njalo.
Into exakile nge-polynya ebonwe ngasogwini lwe-Antarctica yilokho kujule esikepeni se-polar. Ngokusho kososayensi, yenziwe ngezinqubo abangakabi nencazelo ngazo. Kungenzeka yini kube ukuguquka kwesimo sezulu? Kusesekuseni kakhulu ukuthi ungasho, kepha enye yezimbangela kukholakala ukuthi ukuncibilika kweqhwa lasolwandle ngenxa yamanzi afudumele oLwandle i-Antarctic.
Isithombe - I-MODIS-Aqua nge-NASA Worldview
Okokugcina lapho into efanayo ibingabonakala endaweni yaseLwandle i-Weddel kwakungo-1970s, kepha ngaleso sikhathi kwakungekho mathuluzi anele okuyifunda. Manje, ngenxa yeziphuphutheki namarobhothi acwiliswe ekujuleni kolwandle, ochwepheshe bangawahlaziya. Ngakho-ke, bakwazile ukuthola lokho I-polynya yanamuhla ikala cishe amakhilomitha-skwele angama-80.000, usayizi omkhulu ukwedlula indawo yasePanama.
Ngemininingwane engaphezulu, sincoma ukuvakashela ikhasi le-University of Toronto, lapho kungososayensi uKent Moore, ongomunye wabaphenyi bale nto, enza chofoza lapha.