Intra-annual and intra-seasonal flow dynamics of a High Arctic polythermal valley 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 ...
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 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 کاملControls over intra-seasonal dynamics of AVHRR NDVI for the Arctic tundra in northern Alaska
We analysed the Normalized Difference Vegetation Index (NDVI), calculated from biweekly NOAA Advanced Very High Resolution Radiometer (AVHRR) images for northern Alaska at both regional (latitudinal gradients) and site scales. Our objectives were to determine if tundra types and arctic subzones could be differentiated in terms of intra-seasonal patterns of greenness, and to construct the relati...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Annals of Glaciology
سال: 2003
ISSN: 0260-3055,1727-5644
DOI: 10.3189/172756403781815762