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Earth tide forcing of glacier drainage
Author(s) -
Kulessa Bernd,
Hubbard Bryn,
Brown Giles H.,
Becker Julia
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 - 10.1029/2002gl015303
Subject(s) - glacier , geology , bedrock , forcing (mathematics) , drainage , geomorphology , water equivalent , glaciology , climatology , snow , stratigraphy , tectonics , paleontology , ecology , biology
Fourier analysis reveals that winter electrical self potential ( SP ), water pressure ( P W ), and electrical conductivity ( EC ) time series collected beneath Haut Glacier d'Arolla, Switzerland, are forced by earth and atmospheric tides. Forcing is dominant during periods of expanding bedrock, consistent with glacier substrate deformation periodically driving water from the ice body into the bed. This may modify the strength of subglacial sediments, and could therefore influence glacier drainage and motion on a global scale.