Results 51 to 60 of about 5,343,927 (201)

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

Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities [PDF]

The Cryosphere, 2017
Subglacial hydrological processes at tidewater glaciers remain poorly understood due to the difficulty in obtaining direct measurements and lack of empirical verification for modelling approaches.
P. How, P. How, D. I. Benn, N. R. J. Hulton, N. R. J. Hulton, B. Hubbard, A. Luckman, A. Luckman, H. Sevestre, W. J. J. van Pelt, K. Lindbäck, J. Kohler, W. Boot   +12 more
doaj   +1 more source

Enthalpy balance theory unifies diverse glacier surge behaviour

Annals of Glaciology, 2022
It is commonly asserted that there are two distinct classes of glacier surges: slow, long-duration ‘Svalbard-type’ surges, triggered by a transition from cold- to warm-based conditions (thermal switching), and fast, shorter-duration ‘Alaska-type’ surges ...
Douglas I. Benn, Ian J. Hewitt, Adrian J. Luckman   +2 more
doaj   +1 more source

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   +2 more sources

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

Short-term variability in Greenland Ice Sheet motion forced by time-varying meltwater inputs: implications for the relationship between subglacial drainage system behavior and ice velocity. [PDF]

, 2012
High resolution measurements of ice motion along a 120 km transect in a land-terminating section of the GrIS reveal short-term velocity variations (<1 day), which are forced by rapid variations in meltwater input to the subglacial drainage system from
Cowton, Thomas, Bartholomew, Ian, Nienow, Peter, Sole, A., Mair, Douglas, Mair, D., Sole, Andrew, King, Matt A., Cowton, T., Bartholomew, I., King, M.A., Nienow, P., Cowton, Thomas; id_orcid   +12 more
core   +1 more source

On the factors and the degree of their effect on subglacial melt and changes in the state of Antarctic subglacial lakes

Arctic, Antarctic, and Alpine Research
This study presents the results of mathematical modeling of the degree of effects of various characteristics on basal conditions in Antarctica. The model is based on the numerical solution of the one-dimensional Stefan problem.
Alina Boronina, Sergey Popov, Gang Qiao
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

Inferring forms of glacier slip laws from estimates of ice-bed separation during glacier slip

Journal of Glaciology, 2023
Sea-level projections depend sensitively on the parameterization used for basal slip in glacier flow models. During slip over rock-beds, ice-bed separation increases with slip velocity and basal water pressure.
Jacob B. Woodard, Lucas K. Zoet, Neal R. Iverson, Christian Helanow   +3 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