منابع مشابه
Distinct bacterial communities exist beneath a high Arctic polythermal glacier.
Bacterial communities reside in basal ice, sediment, and meltwater in the supra-, sub-, and proglacial environments of John Evans Glacier, Nunavut, Canada. We examined whether the subglacial bacterial community shares common members with the pro- and supraglacial communities, and by inference, whether it could be derived from communities in either of these environments (e.g., by ice overriding ...
متن کاملInversion of a glacier hydrology model
The subglacial hydrologic system exerts strong controls on the dynamics of the overlying ice, yet the parameters that govern the evolution of this system are not widely known or observable. To gain a better understanding of these parameters,we invert a spatially averagedmodel of subglacial hydrology from observations of ice surface velocity and outlet stream discharge at Kennicott Glacier, Wran...
متن کاملThe search for seismic signatures of movement at the glacier bed in a polythermal valley glacier
A passive seismology experiment was conducted across the main overdeepening of Storglaciären in the Tarfala valley, northern Sweden, to investigate the spatial and temporal distribution of basal microseismic waveforms in relation to known dynamics of this small polythermal sub-arctic glacier. The high ablation rate made it difficult to keep geophones buried and well coupled to the glacier durin...
متن کاملMulti-decadal reduction in glacier velocities and mechanisms driving deceleration at polythermal White Glacier, Arctic Canada
Annual and seasonal surface velocities measured continuously from 1960 to 1970 at White Glacier, a 14 km long polythermal valley glacier spanning∼100–1800 m a.s.l., provide the most comprehensive early record of ice dynamics in the Canadian Arctic. Through comparison with differential GPSderived velocity data spanning 2012–16, we find reductions in mean annual velocity by 31 and 38% at lower el...
متن کاملThe Use of a Rational Model in the Mathematical Analysis of a Polythermal Glacier
We here describe the process by which a complex model set of equations and boundary conditions may be rationally reduced to a simpler and more manageable set by the. processes of non dimensionalization and asymptotic approximation. Such a reduced model (derived elsewhere) is then presented for an incompressible, two-dimensional ice Aow. It consists of two coupled equations for the stream funct...
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ژورنال
عنوان ژورنال: Reviews of Geophysics
سال: 2011
ISSN: 8755-1209
DOI: 10.1029/2010rg000350