Results 51 to 60 of about 708,716 (215)

Early Holocene jökulhlaup chronology and deglaciation dynamics in central Iceland

Boreas, EarlyView.
Glacial lake outburst floods (jökulhlaups) have occurred throughout the Quaternary in glaciated regions worldwide. Reconstructing flood chronology yields insight into deglaciation processes, environmental change and the role of extreme events in landscape evolution.
Greta H. Wells, Þorsteinn Sæmundsson, Edwin R. C. Baynes, Timothy Beach, Sheryl Luzzadder‐Beach   +4 more
wiley   +1 more source

Potential Activity of Subglacial Microbiota Transported to Anoxic River Delta Sediments [PDF]

Microbial Ecology, 2017
The Watson River drains a portion of the SW Greenland ice sheet, transporting microbial communities from subglacial environments to a delta at the head of Søndre Strømfjord. This study investigates the potential activity and community shifts of glacial microbiota deposited and buried under layers of sediments within the river delta.
Cameron, Karen A., Stibal, Marek, Olsen, Nikoline S., Mikkelsen, Andreas B., Elberling, Bo, Jacobsen, Carsten S.   +5 more
openaire   +6 more sources

A North Greenland‐wide in situ cosmogenic 14C ice sheet chronology since the Lateglacial

Boreas, EarlyView.
Knowledge of the glacial history of the North Greenland Ice Sheet is crucial due to its high sensitivity to climate change. However, because the ice sheet in this region is predominantly cold‐based, resulting in low erosion rates, using 10Be exposure dating to establish reliable ice sheet chronologies has proven very challenging due to nuclide ...
Anne Sofie Søndergaard, Astrid Rosenberg, Mads Faurschou Knudsen, Kristina Hippe, Marcus  Christl, Negar Haghipour, Olivia Steinemann, Kurt H. Kjær, Nicolaj Krog Larsen   +8 more
wiley   +1 more source

Modelling subglacial fluvial sediment transport with a graph-based model, Graphical Subglacial Sediment Transport (GraphSSeT)

The Cryosphere
Abstract. A quantitative understanding of how sediment discharge from subglacial fluvial systems varies in response to glaciohydrological conditions is essential for understanding marine systems around Greenland and Antarctica and for interpreting sedimentary records of cryosphere evolution.
A. R. A. Aitken, A. R. A. Aitken, I. Delaney, G. Pirot, G. Pirot, M. A. Werder, M. A. Werder   +6 more
openaire   +6 more sources

Subglacial bed form morphology controlled by ice speed and sediment thickness [PDF]

Geophysical Research Letters, 2016
AbstractSubglacial bed forms (drumlins, ribbed moraines, and megascale glacial lineations) are enigmatic repetitive flow‐parallel and flow‐transverse landforms common in glaciated landscapes. Their evolution and morphology are a potentially powerful constraint for ice sheet modeling, but there is little consensus on bed form dynamics or formative ...
Barchyn, T.E., Dowling, T.P.F., Stokes, C.R., Hugenholtz, C.G.   +3 more
openaire   +4 more sources

Late‐Holocene evolution of a small Sub‐Arctic glacier, Gljúfurárjökull (Tröllaskagi, northern Iceland)

Boreas, EarlyView.
Gljúfurárjökull, located on the Tröllaskagi Peninsula in northern Iceland, is a small glacier approximately 3.8 km in length. This study analyses the glacier's evolution through a combination of methods including: (i) geomorphological mapping, (ii) Cosmic‐Ray Exposure (CRE) dating, (iii) lichenometry and (iv) palaeoglacier reconstruction (volume ...
Nuria Andrés, José M. Fernández‐Fernández, David Palacios, Irene Schimmelpfennig, Leopoldo G. Sancho, Skafti Brynjólfsson, Þorsteinn Sæmundsson, Wesley R. Farnsworth, Luis M. Tanarro, Mariano Brito, Javier Santos‐González, Rosa B. González‐Gutiérrez, ASTER Team, Georges Aumaître, Karim Keddadouche   +14 more
wiley   +1 more source

A new methodology to simulate subglacial deformation of water-saturated granular material [PDF]

The Cryosphere, 2015
The dynamics of glaciers are to a large degree governed by processes operating at the ice–bed interface, and one of the primary mechanisms of glacier flow over soft unconsolidated sediments is subglacial deformation.
A. Damsgaard, D. L. Egholm, J. A. Piotrowski, S. Tulaczyk, N. K. Larsen, C. F. Brædstrup   +5 more
doaj   +1 more source

Out in the cold? A review of Early Middle Palaeolithic settlements in northern Central Europe, age data and geological preconditions for site formation and preservation

Boreas, EarlyView.
The characteristics of settlement of Neanderthals in northern Central Europe during the earlier phases of the Middle Palaeolithic (Marine Isotope Stage 8–6) have been a matter of debate for decades, specifically regarding the population dynamics at such latitudes during the coldest phases. In this paper, we review the known archaeological record of the
Gianpiero Di Maida, Jutta Winsemann, Malte Hoffmann, Tobias Lauer, Utz Böhner, Thomas Terberger   +5 more
wiley   +1 more source

Morphology and distribution of lakes under the Laurentide Ice Sheet: implications for ice flow dynamics

Boreas, EarlyView.
This study examines the distribution and morphology of lakes under the Laurentide Ice Sheet (LIS) to investigate relationships with ice flow velocity, bedrock and basal thermal regime. Palaeo‐ice streams and lobes were important components of the LIS, and properties of lakes in those regions are quantified at high resolution.
Sarah M. Principato, Carissa M. Mobley
wiley   +1 more source

Environmentally clean access to Antarctic subglacial aquatic environments

Antarctic Science, 2020
Subglacial Antarctic aquatic environments are important targets for scientific exploration due to the unique ecosystems they support and their sediments containing palaeoenvironmental records.
A. Michaud, T. Vick‐Majors, Amanda M. Achberger, M. Skidmore, B. Christner, M. Tranter, J. Priscu   +6 more
semanticscholar   +1 more source