Drainage system behaviour of a High-Arctic polythermal glacier
نویسندگان
چکیده
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 ...
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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...
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[1] The drainage systems of polythermal glaciers play an important role in high-latitude hydrology, and are determinants of ice flow rate. Flow-recession analysis and linear-reservoir simulation of runoff time series are here used to evaluate seasonal and inter-annual variability in the drainage system of the polythermal Finsterwalderbreen, Svalbard, in 1999 and 2000. Linear-flow recessions are...
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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 کاملNitrate production beneath a High Arctic glacier, Svalbard
a Department of Geography, University of Sheffield, Winter St., Sheffield S10 2TN, UK 3 4 b British Geological Survey, Keyworth, Nottingham NG12 5GG, UK 5 6 Abstract 7 Natural environmental isotopes of nitrate and ammonium are used in conjunction with major 8 ion chemistry and hydrological data to establish controls upon the biogeochemical cycling of 9 nitrogen beneath a High Arctic polythermal...
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ژورنال
عنوان ژورنال: Annals of Glaciology
سال: 1999
ISSN: 0260-3055,1727-5644
DOI: 10.3189/172756499781821922