All articles tagged with #lake vostok
Beneath East Antarctica’s ice sheet, Lake Vostok—a lake roughly the size of Lake Ontario under about four kilometers of ice—has remained liquid for about 15 million years due to insulation, a pressure-lowered melting point, and continuous geothermal heat flux, driving circulation and accretion ice formation; evidence hints at microbial life, highlighting a unique, isolated habitat hidden from sunlight.
Beneath roughly four kilometres of Antarctic ice at Vostok Station, Lake Vostok—about the size of Lake Ontario—remains liquid thanks to insulation by the ice, a pressure-lowered melting point, and a steady geothermal heat flux that keeps the basal boundary near the melting point. The ice’s slope creates zones of melting and freezing, driving circulation and a slow exchange with accretion ice at the bottom. The lake has likely stayed isolated for about 15 million years from sunlight and direct atmosphere, though the water itself is mobile and the exact ages of water or material differ; while microbes have been detected in accretion ice, clean evidence from the main water column is hampered by drilling contamination, so a robust biological census remains elusive.
In 2012, a Russian drill punched into Lake Vostok, a Lake Ontario-sized subglacial lake beneath East Antarctica sealed for about 15 million years. The refrozen borehole plug contained DNA from organisms that evolved in total darkness, including novel sequences, showing that life can persist without sunlight and providing a valuable analogue for icy worlds like Europa and Enceladus. Contamination concerns linger and future sterile robotic sampling has been discussed, but the lake remains isolated for now as scientists refine its hidden ecosystem and its implications for life beyond Earth.
An international team mapped a continent-wide, two-mile-deep network of basins under East Antarctica—now called the East Antarctic Fan-shaped Basin Province—linking Wilkes and Aurora basins with Lake Vostok. Using gravity measurements, magnetic data, and subglacial topography, they describe a fan-shaped megabasin formed by ancient crustal spreading before Gondwana’s breakup, which influences how ice moves over the bed and could affect projections of Antarctica’s response to climate change.