منابع مشابه
The 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 کاملQuantifying sublimation of buried glacier ice in Beacon Valley
A remnant of Taylor Glacier ice rests beneath a 40-to-80-cm-thick layer of sublimation till in central Beacon Valley, Antarctica. Our 1-D vapor diffusion model, with input from micrometeorological data collected during the 2004 austral summer, shows that vapor flows into and out of sublimation till at rates dependent on the non-linear variation of vapor concentration with depth. Although measur...
متن کاملSpatial variability in the flow of a valley glacier: Deformation of a large array of boreholes
Measurements of the deformation of a dense array of boreholes in Worthington Glacier, Alaska, show that the glacier moves with generally bed-parallel motion. Strain in the 200 rn deep valley glacier is constant near the surface but follows a nonlinear vertical profile below a depth of about 120 m. By a depth of 180 m, the octahedral strain rate reaches 0.35 yr -•. The three-dimensional velocity...
متن کاملEvidence of Low Northern Midlatitude (~33n) Valley Glacier Deposits along the Dichotomy Boundary: Nilosyrtis
Introduction: Lineated valley fill (LVF) and lobate debris aprons (LDA) form in association with fretted terrain and fretted channels in the northern part of Ara-bia Terra [1-3]. Geological mapping in the region [4] shows that LVF and LDA represent Amazonian-aged modification of the fretted topography, which itself formed prior to middle Hesperian. Expanding on [1-11], we report observations of...
متن کاملMulti-decadal elevation changes on Bagley Ice Valley and Malaspina Glacier, Alaska
[1] Digital elevation models (DEMs) of Bagley Ice Valley and Malaspina Glacier produced by (i) Intermap Technologies, Inc. (ITI) from airborne interferometric synthetic aperture radar (InSAR) data acquired 4–13 September 2000, (ii) the German Aerospace Center (DRL) from spaceborne InSAR data acquired by the Shuttle Radar Topography Mission (SRTM) 11–22 February 2000, and (iii) the US Geological...
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ژورنال
عنوان ژورنال: Current World Environment
سال: 2014
ISSN: 0973-4929,2320-8031
DOI: 10.12944/cwe.9.2.30