Physics – Geophysics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3905402l&link_type=abstract
Geophysical Research Letters, Volume 39, Issue 5, CiteID L05402
Physics
Geophysics
Biogeosciences: Permafrost, Cryosphere, And High-Latitude Processes (0702, 0716), Geodesy And Gravity: Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 4550), History Of Geophysics: Nonlinear Geophysics, Hydrology: Chemistry Of Fresh Water, Geographic Location: Antarctica (4207)
Scientific paper
Spatially isolated patches of soil located in Taylor Valley, McMurdo Dry Valleys, Antarctica, are sites of elevated salt content and soil moisture. During Antarctic spring, in the absence of snow melt, visibly wet (reduced albedo) patches of soil are present at the surface. The soil pore fluids are hypersaline and have average water activity of 0.74 (the water activity of a solution determines the equilibrium vapor pressure of that solution), and are an order of magnitude more saline than average soils in the Dry Valleys. These salty soils are 3-5 times more water rich than average soils. Geochemical and meteorological analyses show that these wet patches are sites of direct vapor emplacement into soil pore fluids that may ultimately be sourced by the deliquescence of soil salts. These wet patches represent a non-precipitation, non-groundwater source for water into Antarctic permafrost.
Fountain Andrew G.
Levy Joseph S.
Lyons Berry W.
Welch Kathy A.
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