Results 11 to 20 of about 19,515,932 (251)

Subglacial drainage processes at a High Arctic polythermal valley glacier [PDF]

Journal of Glaciology, 2005
AbstractDye-tracer experiments undertaken over two summer melt seasons at polythermal John Evans Glacier, Ellesmere Island, Canada, were designed to investigate the character of the subglacial drainage system and its evolution over a melt season. In both summers, dye injections were conducted at several moulins and traced to a single subglacial outflow.
Bingham, Robert George, Nienow, Peter W., Sharp, Martin J., Boon, Sarah   +3 more
openaire   +6 more sources

Representing Glaciations and Subglacial Processes in Hydrogeological Models: A Numerical Investigation [PDF]

Geofluids, 2017
The specific impact of glacial processes on groundwater flow and solute transport under ice-sheets was determined by means of numerical simulations. Groundwater flow and the transport of δ18O, TDS, and groundwater age were simulated in a generic sedimentary basin during a single glacial event followed by a postglacial period.
Arnaud Sterckx, Jean-Michel Lemieux, Rein Vaikmäe   +2 more
openaire   +3 more sources

Different geomorphic processes control suspended sediment and bedload export from glaciers [PDF]

Nature Communications
Ongoing cryospheric change has modified sediment export from glacierized catchments substantially, with significant implications for ecosystems and downstream users, notably hydropower companies.
Ian Delaney, Frédéric Lardet, Matt Jenkin, Davide Mancini, Stuart N. Lane   +4 more
doaj   +2 more sources

Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica [PDF]

Geology, 2016
Subglacial Lake Whillans (SLW), West Antarctica, located beneath 800 m of ice is an active component of the subglacial hydrological network. The fill and drain behavior of SLW leads to long (years - decades) water residence times. Here, we present the aqueous geochemistry of the SLW water column and porewaters from a 36 cm sediment core.
Alexander B Michaud, Mark L Skidmore, Andrew C Mitchell, Trista J VickMajors, Carlo Barbante, Clara Turetta, Will vanGelder, John C Priscu   +7 more
openaire   +4 more sources

An investigation of subglacial processes at the microscale from Briksdalsbreen, Norway

Sedimentology, 2006
AbstractThe subglacial processes at Briksdalsbreen, Norway, are examined by a combination of sedimentology, thin section and scanning electron microscope (SEM) analysis of till samples from an exposed subglacial surface and from beneath the glacier.
J. Hart
openaire   +3 more sources

Mineral deformation and subglacial processes on ice-bedrock interface of Hailuogou Glacier

Chinese Science Bulletin, 2009
Hailuogou Glacier is located in a warm and humid maritime environment. It is large and moves very fast. The bottom of the glacier slides intensively and the temperature at the bottom approaches the pressure melting point. Therefore, there are abundant melting water and debris which act as effective “grinding tools” for glacial abrasion.
GengNian Liu, YiXin Chen, Yue Zhang, HaiRong Fu   +3 more
openaire   +2 more sources

Carbon Emissions From the Edge of the Greenland Ice Sheet Reveal Subglacial Processes of Methane and Carbon Dioxide Turnover

Journal of Geophysical Research: Biogeosciences, 2021
Direct gaseous emissions of methane (CH4) and carbon dioxide (CO2) from the subglacial environment under Greenland Ice Sheet (GrIS) were only recently discovered and it is yet to be determined how important it is for the panarctic carbon budget.
J. Christiansen, T. Röckmann, M. E. Popa, C. Sapart, Christian Juncher Jørgensen   +4 more
semanticscholar   +1 more source

Subglacial meltwater routes of the Fennoscandian Ice Sheet

Journal of Maps, 2022
Subglacial drainage systems are crucial elements of glaciers and ice sheets because they modulate ice flow velocity. However, logistical challenges of measuring subglacial processes beneath contemporary ice and natural limitations in long-term monitoring
Nico Dewald, Stephen J. Livingstone, Chris D. Clark   +2 more
doaj   +1 more source

Drainage and refill of an Antarctic Peninsula subglacial lake reveal an active subglacial hydrological network [PDF]

The Cryosphere, 2022
The presence of subglacial lakes and subglacial hydrological networks under the East and West Antarctic ice sheets is now relatively well understood, whilst their influence on ice dynamics is the subject of ongoing research.
D. A. Hodgson, T. A. Jordan, N. Ross, T. R. Riley, P. T. Fretwell   +4 more
doaj   +1 more source

Tracking coarse sediment in an Alpine subglacial channel using radio-tagged particles

Journal of Glaciology, 2023
We present a method for tracking radio-tagged pebbles and cobbles through subglacial meltwater channels under shallow temperate glaciers. Natural particles tagged with active radio transmitters were injected directly into a large subglacial channel 300 m
Matt Jenkin, Margaux Hofmann, Bryn Hubbard, Davide Mancini, Floreana M. Miesen, Frédéric Herman, Stuart N. Lane   +6 more
doaj   +1 more source