Results 61 to 70 of about 25,706 (259)
Journal of Quaternary Science, EarlyView.ABSTRACT The northern European distal cryptotephra framework is constantly developing both in terms of identification of new tephra horizons and improved age constraints for the already well‐established tephra marker horizons. However, many prehistoric tephra layers have only been dated by the radiocarbon method, with its inherent problems.
Maarit Kalliokoski +2 more
wiley +1 more source
Changes in West Antarctic ice stream dynamics observed with ALOS PALSAR data
Geophysical Research Letters, 2008 The Advanced Land Observation System (ALOS) Phased‐Array Synthetic‐Aperture Radar (PALSAR) is an L‐band frequency (1.27 GHz) radar capable of continental‐scale interferometric observations of ice sheet motion.
Eric Rignot
doaj +1 more source
Englacial Pore Water Localizes Shear in Temperate Ice Stream Margins [PDF]
, 2019 The margins of fast‐moving ice streams are characterized by steep velocity gradients. Some of these gradients cannot be explained by a temperature‐dependent viscosity alone.
Haseloff, Marianne +2 more
core +2 more sources
Journal of Quaternary Science, EarlyView.ABSTRACT Victoria Cave, north Yorkshire, England, contains a long sequence of Pleistocene clastic sediments and calcite flowstones. Earlier work, using U–Th dating, established that the flowstone units formed in interglacial stages corresponding to Marine Isotope Stages (MIS) 13, 11, 9, 7 and 5.
Tom C. Lord +7 more
wiley +1 more source
Лëд и снег, 2022 The year 2022 marks the 30th anniversary from operation of the Russian-American drifting station in the Antarctic. It was first experience of organizing a research station on sea ice in the South Polar exploration. Russia and the U.S.
V. V. Lukin
doaj +1 more source
Permafrost Distribution in the Canadian Rockies: Key Variables Influencing Patch‐Scale Variability
Permafrost and Periglacial Processes, EarlyView.ABSTRACT The spatial distribution of permafrost in mountainous regions is influenced by various factors such as topography, climate, vegetation, and substrate. Despite the existence of comprehensive permafrost maps at national and global levels, they fail to accurately represent the patch‐scale (e.g., < 25 m) permafrost distribution in characteristic ...
Gerardo Zegers +2 more
wiley +1 more source
Permafrost and Periglacial Processes, EarlyView.ABSTRACT The progressive weakening of alpine rockwalls through subcritical cracking, driven by repeated low‐magnitude stress processes, plays a key role in alpine rock weathering. Laboratory studies using acoustic emission (AE) monitoring have shown that thermal stresses from freeze–thaw cycling induce crack propagation, with recent work highlighting ...
Andrew Mitchell, Oliver Sass
wiley +1 more source
Permafrost and Periglacial Processes, EarlyView.ABSTRACT Under continued climate warming, understanding present‐day permafrost distribution and the controls on ground thaw are critical for predicting permafrost thaw trajectories and associated implications. This study presents a high‐resolution investigation of permafrost extent and active layer thickness (ALT) across a coniferous forested hillslope
Alana Muenchrath +2 more
wiley +1 more source
The Dominion Range Ice Core, Queen Maud Mountains, Antarctica - General Site and Core Characteristics with Implications [PDF]
, 2017 The Transantarctic Mountains of East Antarctica provide a new milieu for retrieval of ice-core records. We report here on the initial findings from the first of these records, the Dominion Range ice-core record.
Gow, Anthony J. +9 more
core +1 more source
Permafrost and Periglacial Processes, EarlyView.ABSTRACT High‐resolution mapping of permafrost in ecologically and topographically complex landscapes remains a major challenge. Existing models of permafrost extent often rely on equilibrium assumptions, which can misrepresent conditions in regions where permafrost persists largely due to ecosystem structure.
Philip P. Bonnaventure +3 more
wiley +1 more source