Results 51 to 60 of about 257,875 (187)

The influence of a model subglacial lake on ice dynamics and internal layering [PDF]

The Cryosphere, 2016
As ice flows over a subglacial lake, the drop in bed resistance leads to an increase in ice velocities and a draw down of isochrones and cold ice. The ice surface flattens as it adjusts to the lack of resisting forces at the base. The rapid transition in
E. Gudlaugsson, A. Humbert, T. Kleiner, J. Kohler, K. Andreassen   +4 more
doaj   +1 more source

New constraints on the postglacial evolution of Lago Maggiore, Northern Italy

Journal of Quaternary Science, EarlyView.
ABSTRACT Lago Maggiore is situated in an overdeepened valley reach at the southern margin of the European Alps, and its thick sediment infill allows the reconstruction of the postglacial valley and lake evolution. We study here the sedimentary succession in the lower Ossola Valley, which is infilled by ~500 m of deposits. In a marginal position, a core
Lukas Gegg, Alexander Fülling, Andrew Greenwood, György Hetényi, F. Martin Hofmann, Giovanni Monegato, Jahir S. Rangel Herrera, Camille Schirra, Marco Venier, Othmar Müntener   +9 more
wiley   +1 more source

NEW FRONTIERS OF ANTARCTIC SUBGLACIAL LAKES EXPLORATION

Geography, Environment, Sustainability, 2013
Antarctic subglacial aquatic environment have become of great interest to the science community because they may provide unique information about microbial evolution, the past climate of the Earth, and the formation of the Antarctic ice sheet.
Pavel Talalay, Alexey Markov, Mikhail Sysoev   +2 more
doaj   +1 more source

Review of the Salpausselkä ice‐marginal formations in Finland

Journal of Quaternary Science, EarlyView.
ABSTRACT Extensive Salpausselkä ice‐marginal formations were deposited in southern and eastern Finland during the Weichselian deglaciation. These comprise three major ridges (I, II, and III Salpausselkäs) and their eastern counterparts (Tuupovaara, Koitere, and Pielisjärvi), together forming laterally continuous ice‐marginal formations extending ...
Jukka‐Pekka Palmu, Jussi Hovikoski, Reijo Pitkäranta, Antti E. K. Ojala   +3 more
wiley   +1 more source

Updating thermal head of RECoverable Autonomous Sonde (RECAS) for better drilling performance in Qilin Subglacial Lake exploration [PDF]

Geoscientific Instrumentation, Methods and Data Systems
There are numerous subglacial lakes in Antarctica, typically covered by thick ice sheets. Qilin Subglacial Lake is one of the largest subglacial lakes in Antarctica, lying beneath approximately 3600 m of ice. The exploration of this unique environment is
Y. Li, Y. Li, X. Lei, X. Lei, X. Fan, H. Yu, B. Li, B. Li, S. Peng, Y. Ye, Y. Ye   +10 more
doaj   +1 more source

The rise and fall of a volcanic plateau: Landscape evolution at the fringes of the former Patagonian Ice Sheet, Meseta Chile Chico, central Patagonian Andes

Journal of Quaternary Science, EarlyView.
ABSTRACT Understanding Earth‐surface processes along the fringes of large ice sheets is integral to deciphering cold‐region environmental variability and anticipating slope instability under climate change. We investigate the Meseta Chile Chico, a volcanic plateau in the central Patagonian Andes, located at the eastern margin of the former Patagonian ...
Carolina Franco, Emma‐Louise Cooper, Antonio Maldonado, María Eugenia de Porras, Amalia Nuevo‐Delaunay, César Méndez, Varyl R. Thorndycraft, Alessa Geiger, Bernd Zolitschka   +8 more
wiley   +1 more source

A balanced water layer concept for subglacial hydrology in large-scale ice sheet models [PDF]

The Cryosphere, 2013
There is currently no doubt about the existence of a widespread hydrological network under the Antarctic Ice Sheet, which lubricates the ice base and thus leads to increased ice velocities.
S. Goeller, M. Thoma, K. Grosfeld, H. Miller   +3 more
doaj   +1 more source

3D seismic imagery of a buried glacitectonic thrust complex in the North Sea and the dimensions of composite ridge systems in glaciated landscapes

Journal of Quaternary Science, EarlyView.
ABSTRACT Sets of sub‐parallel composite ridges in glaciated landscapes have long been regarded as landforms produced by glacitectonism, the brittle and ductile deformation of sediments at and immediately beyond glacier and ice‐sheet margins resulting from stresses produced by ice.
Dag Ottesen, Julian A. Dowdeswell
wiley   +1 more source

Modeling oscillations in connected glacial lakes

Journal of Glaciology, 2019
Mountain glaciers and ice sheets often host marginal and subglacial lakes that are hydraulically connected through subglacial drainage systems. These lakes exhibit complex dynamics that have been the subject of models for decades.
Aaron G. Stubblefield, Timothy T. Creyts, Jonathan Kingslake, Marc Spiegelman   +3 more
doaj   +1 more source

Introducing a ramped pyrolysis/oxidation‐14CO2 analysis system operated with mobile molecular sieve traps

Limnology and Oceanography: Methods, EarlyView.
Abstract A novel instrument for the thermal degradation of sedimentary organic matter was set up at the Alfred Wegener Institute (AWI) in Bremerhaven, Germany, with the aim of enabling Ramped Pyrolysis/Oxidation‐14C analysis as direct CO2 gas measurement.
Laura Kattein, Malte Höhn, Hendrik Grotheer, Torben Gentz, Gesine Mollenhauer   +4 more
wiley   +1 more source