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Underglacial lake Vostok in Antarctida

Mardi 14 janvier 2020 14:00 - Duree : 1 heure
Lieu : ILL 4 - Chadwick amphitheatre - 71, avenue des Martyrs - Grenoble

Orateur : V.F. EZHOV (Petersburg Nuclear Physics Institute NRS KI, Gatchina, Russia / Saint-Petersburg State University, Saint-Petersburg, Russia)

The relevance of the study of lake Vostok, as the largest subglacial body of water in Antarctica, is primarily due to the fact that it is a unique aquatic ecosystem, isolated from the earth’s atmosphere and surface biosphere for about 14 million years. Extreme conditions characterized by pressure up to 400 ATM. the absence of light, the specific gas (superabundance of dissolved oxygen) and the chemical composition of water (fresh and ultrapure without organic compounds), and the prolonged isolation of lake Vostok suggest the possibility of adaptation (to increasing oxygen pressure) and rapid evolution of previously existing forms of (microbial) life, significantly different from those known to modern science, the study of which will contribute to a better understanding of the processes of life development, as on Earth, so it is on the ice planets and satellites of the solar system. The considerable size of the lake allows us to consider it as an earthly analogue of the oceans, which are believed to exist under the powerful ice shells of Europa-a moon of Jupiter, and Enceladus-a moon of Saturn. Thus, the area of lake Vostok is of interest as a testing ground for methods of detection and study of life in extreme (extraterrestrial) conditions. Along with this, the reconstruction of the origin and development of the subglacial lake Vostok, the establishment of its current parameters and regime, as well as the study of the composition of lake water and bottom sediments are now considered as integral components of the study of the geological history, glaciation and climate of Antarctica. The above explains the exceptional interest of the international scientific community in the study of lake Vostok, which predetermines its Central place among the most significant scientific programs that will be implemented in Antarctica in the coming decades.

Contact : tellier@ill.fr

Discipline évènement : (Physique)
Entité organisatrice : (ILL)
Nature évènement : (Séminaire)
Evènement répétitif : (General ILL Seminar - College 3)
Site de l'évènement : Polygone scientifique

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