Results 91 to 100 of about 145,942 (141)

High basal melting forming a channel at the grounding line of Ross Ice Shelf, Antarctica

Geophysical Research Letters, 2016
Antarctica's ice shelves are thinning at an increasing rate, affecting their buttressing ability. Channels in the ice shelf base unevenly distribute melting, and their evolution provides insight into changing subglacial and oceanic conditions.
Oliver J. Marsh, Helen A. Fricker, Matthew R. Siegfried, Knut Christianson, Keith W. Nicholls, Hugh F. J. Corr, Ginny Catania   +6 more
doaj   +1 more source

Subglacial soft bed hydrology and climate change

Abstract Water at the glacier base controls the ‘slipperiness’ of the bed and the rate of glacier contribution to sea level rise, yet very little is known about this process associated with soft bedded glaciers. There is a continuum between distributed and channelized systems, associated with soft bedded glaciers, which have a distinct ...
Jane Hart, Nathaniel Baurley, Amelia Andrews, Benjamin Robson, Kirk Martinez   +4 more
openaire   +1 more source

The subglacial landscape and hydrology of Antarctica mapped from space

, 2021
<p><b>To narrow uncertainties in the Antarctic ice sheet's contribution to sea level rise, we present a collection of novel machine learning and automated satellite remote sensing methods which use ice surface observations to infer the subglacial nature of Antarctica. A super-resolution deep neural network called DeepBedMap was designed and
openaire   +2 more sources

Eurasian ice-sheet dynamics and sensitivity to subglacial hydrology [PDF]

, 2017
Ice-stream dynamics are strongly controlled by processes taking place at the ice/bed interface where subglacial water both lubricates the base and saturates any existing, underlying sediment. Large parts of the former Eurasian ice sheet were underlain by
SEBASTIAN BEYER, KARIN ANDREASSEN, Humbert, Angelika, Beyer, Sebastian, Clason, Caroline C, Clason, Caroline C., Andreassen, Karin, CAROLINE C. CLASON, Kleiner, Thomas, THOMAS KLEINER, Gudlaugsson, Eythor, ANGELIKA HUMBERT, EYTHOR GUDLAUGSSON, Gudlaugsson, E, Humbert, A, Andreassen, K, et al,   +16 more
openaire   +3 more sources

Groundwater feedbacks on ice sheets and subglacial hydrology

The dynamics of many of Antarctica's glaciers are modulated by a hydrological system at the base of the ice. Sedimentary basins beneath the ice bed contribute to the water budget in this hydrological system by discharging or taking up water. However, sedimentary basins are not included in most current models of ice dynamics, and little is known about ...
Cairns, Gabriel J., Benham, Graham P., Hewitt, Ian J.   +2 more
openaire   +2 more sources

The past, present, and future evolution of Aurora Subglacial Basin’s subglacial drainage system

Nature Communications
Aurora Subglacial Basin (ASB) in East Antarctica is among the most rapidly changing regions in Antarctica. Beneath the ASB, subglacial drainage networks allow for fast ice flow and facilitate mass losses by eroding the coastal ice shelves.
Anna-Mireilla Hayden, Tyler Pelle, Christine F. Dow   +2 more
doaj   +1 more source

Transient subglacial water routing efficiency modulates ice velocities prior to surge termination on Sít’ Kusá, Alaska

Journal of Glaciology
Glacier surges are opportunities to study large amplitude changes in ice velocities and accompanying links to subglacial hydrology. Although the surge phase is generally explained as a disruption in the glacier's ability to drain water from the bed, the ...
Yoram Terleth, Timothy C. Bartholomaus, Jukes Liu, Flavien Beaud, Thomas Dylan Mikesell, Ellyn Mary Enderlin   +5 more
doaj   +1 more source

The impact of the friction law on coupled subglacial hydrology and ice flow modeling

Journal of Glaciology
Basal sliding is an important component of ice motion that is integrated into ice flow models via the use of a friction law, which relates basal shear stress to basal sliding speed and effective pressure.
Koi R. K. McArthur, Christine F. Dow, Shivani Ehrenfeucht   +2 more
doaj   +1 more source

Entrained Water in Basal Ice Suppresses Radar Bed‐Echo Power at Active Subglacial Lakes

Geophysical Research Letters
Subglacial lakes have been mapped across Antarctica with two methods, radio‐echo sounding (RES) and ice‐surface deformation. At sites where both are coincident, these methods typically provide conflicting interpretations about the ice‐bed interface. With
B. H. Hills, M. R. Siegfried, D. M. Schroeder   +2 more
doaj   +1 more source

Modelling the subglacial hydrology of the former Barents Sea Ice Sheet [PDF]

, 2015
Ice dynamics are strongly controlled by processes taking place at the interface between the ice and the underlying bed. In modern day ice sheets, up to 90% of mass is lost through fast-flowing corridors of ice, called ice streams.
Gudlaugsson, Eythor
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