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Clathrate formation and the fate of noble and biologically useful gases in Lake Vostok, Antarctica
Author(s) -
McKay C. P.,
Hand K. P.,
Doran P. T.,
Andersen D. T.,
Priscu J. C.
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl017490
Subject(s) - clathrate hydrate , water column , noble gas , geology , seawater , oceanography , supersaturation , dissolved organic carbon , carbon dioxide , environmental chemistry , hydrology (agriculture) , environmental science , chemistry , hydrate , organic chemistry , geotechnical engineering
Lake Vostok is a large lake located 4 km beneath the East Antarctic Ice Sheet that should be supersaturated with dissolved gases in equilibrium with clathrate present in the water column. Here we show that if the age of the lake is such that the lake water mass has been cycled over 30 times then the total dissolved gas equilibrates at about 2.5 liters (STP) of gas per kg of water; high enough to have important implications for drilling into this deep subglacial lake. Different air gases are preferentially incorporated into the clathrate and thus the molar ratios in the water column will reflect the presence of clathrate and indicate a more precise age of the lake. Preferential incorporation of CO 2 into the clathrate would result in the clathrate sinking if the carbon input is 1% of the air input and the lake water is fresh water. The redox state of the lake is set by the high oxygen concentration which is 50 times more than air‐equilibrated water and may be a severe biological stress.