Article
Geosciences, Multidisciplinary
C. M. Darvill, B. Menounos, B. M. Goehring, A. J. Lesnek
Summary: This study reports 20 Be-10 exposure ages from glacial erratics and bedrock on the west coast of British Columbia, Canada, contributing to the existing chronologies of Cordilleran Ice Sheet retreat along approximately 600 km of coastal North America. The data show that the western ice limit reached the present coast by 18-16 ka then slowed its retreat for around 4,000 years until 14-13 ka. The initial retreat is attributed to destabilization and grounding line retreat caused by rising sea level and/or ocean warming in the northern Pacific. Despite increasing temperatures, the subsequent stability of the ice sheet at the present coastal margin is likely due to the transition from marine to terrestrial margins.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geography, Physical
Johan Kleman, Martina Hattestrand, Ingmar Borgstrom, Derek Fabel, Frank Preusser
Summary: Studies have challenged previous assumptions of continuous ice cover in the core area of the Fennoscandian Ice Sheet during the Pleistocene, with evidence suggesting ice-free conditions in central Scandinavia from around 55 ka to about 35 ka.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Maria-Paz Lira, Juan-Luis Garcia, Michael J. Bentley, Stewart S. R. Jamieson, Christopher M. Darvill, Andrew S. Hein, Hans Fernandez, Angel Rodes, Derek Fabel, Rachel K. Smedley, Steven A. Binnie
Summary: This study presents geomorphological and geochronological reconstructions of the glacial and deglacial landforms in the southernmost part of Patagonia during the last glacial period. Through dating the moraines and paleo lakes, the study reveals the asynchrony of ice advances and different patterns of ice retreat between neighboring lobes, which may be attributed to the interaction between topography and precipitation from the southern westerly wind belt.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Environmental Sciences
Hyun-Hee Rhee, Yeong-Bae Seong, Ju-Sun Woo, Changhwan Oh, Byung-Yong Yu
Summary: This study investigates the Ricker Hills in the Transantarctic Mountains using in-situ cosmogenic-nuclide Be-10 surface exposure dating to reconstruct the paleo-glacial dynamics. The research reveals that the glaciers had been thicker in previous glacial periods and experienced the greatest lowering and retreat during the late Holocene.
JOURNAL OF MOUNTAIN SCIENCE
(2022)
Article
Geography, Physical
M. R. Kaplan, K. J. Licht, J. L. Lamp, G. Winckler, J. M. Schaefer, J. A. Graly, C. M. Kassab, R. Schwartz
Summary: This study presents 100 cosmogenic surface exposure ages, including 75 new analyses, for a blue-ice moraine complex at Mt. Achernar in the central Transantarctic Mountains. The ages reveal the past behavior of the East Antarctic Ice Sheet along the edge of the polar plateau since sediment accumulation began around 0.5-1 Ma. The findings suggest relatively minor fluctuations in surface elevation and disturbances to the blue-ice moraine architecture over time. This research highlights the importance of blue-ice sediments as a paleoglaciologic and paleoclimate archive in Antarctica. Rating: 8/10.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geography, Physical
Chris D. Clark, Richard C. Chiverrell, Derek Fabel, Richard C. A. Hindmarsh, Colm O. Cofaigh, James D. Scourse
Summary: The BRITICE-CHRONO project advanced knowledge of the former British-Irish Ice Sheet by collecting a large amount of data through systematic sampling activities. By studying eight transects, the project produced important paleogeographic reconstructions of ice margin positions.
JOURNAL OF QUATERNARY SCIENCE
(2021)
Article
Geography, Physical
D. J. A. Evans, I. R. Smith, J. C. Gosse, J. M. Galloway
Summary: The study provides a fundamental revision of the Quaternary stratigraphy in the Smoking Hills area of the western Canadian Arctic, revealing a fully glaciated landscape during the last glaciation and complex glacial deposition processes.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geography, Physical
Helen E. Dulfer, Martin Margold, Zbynek Engel, Regis Braucher, Georges Aumaitre, Didier Bouries, Karim Keddadouche
Summary: Utilizing in situ produced cosmogenic dating reveals that Mount Spieker became ice free before the Bolling warming, while Mount Morfee remained in contact with the Cordilleran Ice Sheet until the Younger Dryas.
QUATERNARY RESEARCH
(2021)
Article
Biology
Mark I. Stevens, Andrew N. Mackintosh
Summary: The origin of terrestrial biota in Antarctica has been a subject of debate for over 120 years. Previous hypotheses failed to explain the survival of life on the continent during glacial periods. In this study, we provide support for the nunatak refuge hypothesis, which suggests that ice-free land above the ice sheet served as refuges for terrestrial biota. Our interdisciplinary approach combines biological and geological evidence to outline the mechanisms of these refuges and their role in shaping Antarctic landscapes and biota through changing climates.
Article
Geography, Physical
Tom Bradwell, David Small, Derek Fabel, Chris D. Clark, Richard C. Chiverrell, Margot H. Saher, Dayton Dove, S. Louise Callard, Matthew J. Burke, Steven G. Moreton, Alicia Medialdea, Mark D. Bateman, David H. Roberts, Nicholas R. Golledge, Andrew Finlayson, Sally Morgan, Colm O. Cofaigh
Summary: The offshore sector around Shetland is one of the least studied areas of the former British-Irish Ice Sheet, with key scientific issues including the dominance of a locally sourced 'Shetland ice cap' versus an invasive Fennoscandian Ice Sheet, the flow configuration and style of glaciation, the nature of confluence between different ice sheets, the cause and rate of ice sheet separation, and the wider implications of ice sheet uncoupling on subsequent deglaciation. New data from geological, geomorphological, marine geophysical, and geochronological studies are presented to address these unresolved questions.
JOURNAL OF QUATERNARY SCIENCE
(2021)
Article
Environmental Sciences
Nicolaj K. Larsen, Anne Sofie Sondergaard, Laura B. Levy, Astrid Strunk, Daniel S. Skov, Anders Bjork, Shfaqat A. Khan, Jesper Olsen
Summary: Northeast Greenland has experienced significant changes in the Greenland Ice Sheet, and this study provides new age constraints for the deglaciation process. By analyzing cosmogenic exposure ages, the authors determine that the outer coast region deglaciated between 12.8 +/- 0.6 and 11.5 +/- 0.2 ka, while the region close to the present ice margin deglaciated 2 to 4 ka later between 9.2 +/- 0.3 to 8.6 +/- 0.3 ka. These findings contribute to our understanding of the glaciation history of the Greenland Ice Sheet and can be useful for future ice sheet models.
ARCTIC ANTARCTIC AND ALPINE RESEARCH
(2022)
Article
Geography, Physical
Richard Christopher Chiverrell, Geoff Stephen Powell Thomas, Matthew Burke, Alicia Medialdea, Rachel Smedley, Mark Bateman, Chris Clark, Geoffrey A. T. Duller, Derek Fabel, Geraint Jenkins, Xianjiao Ou, Helen Marie Roberts, James Scourse
Summary: The study reconstructs the last advance and retreat of the Irish Sea Glacier (ISG), showing the formation of time-transgressive moraines and bedrock-dammed basins during its retreat. The coherent chronology obtained from glacial sediments reveals an early development of ice during late Marine Isotope Stage 3 and Greenland Stadial 5, followed by retreat and readvance of ice from Welsh during GS-2. The research highlights the complex interplay between climate, ice piracy, and glacial dynamics.
JOURNAL OF QUATERNARY SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Joanne S. Johnson, David Pollard, Pippa L. Whitehouse, Stephen J. Roberts, Dylan H. Rood, Joerg M. Schaefer
Summary: The study applied a limited-area nested ice sheet model to investigate the last deglacial retreat of the West Antarctic Ice Sheet in the Amundsen Sea Embayment. The model simulations suggest a broadly similar response to ocean forcing in both central and eastern ASE, with an initial rapid phase of thinning followed by a slower phase to the modern configuration. The model-data mismatch could potentially be improved by considering regional variations in mantle viscosity, sea-surface heights, and basal sliding properties across the continental shelf.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geography, Physical
Karol Tylmann, Vincent R. Rinterknecht, Piotr P. Wozniak, Vallery Guillou
Summary: A new set of 10Be surface exposure ages of boulders located on the Pomeranian moraines and nearby erratic boulders in northern Poland was presented. By combining these ages with recalculated 10Be surface exposure ages along the Pomeranian ice-marginal belt, the researchers were able to determine the timing of the ice front standstill and retreat. The study provides insights into the geomorphological record of the Last Weichselian Pomeranian Phase in northern Poland.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Alberto Reyes, Anders E. Carlson, Glenn A. Milne, Lev Tarasov, Jesse R. Reimink, Marc W. Caffee
Summary: New Be-10 surface exposure ages provide direct dating for the deglaciation of the northwest Laurentide ice sheet. The results suggest a slower retreat rate compared to previous estimates and highlight the need for further refinement of the deglacial chronology to study the relationship with climate change and sea-level rise.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Alexander R. Simms, Louise Best, Ian Shennan, Sarah L. Bradley, David Small, Emmanuel Bustamante, Amy Lightowler, Dillon Osleger, Juliet Sefton
Summary: This study examines the relative sea-level (RSL) changes accompanying the retreat of the Minch Ice Stream (MnIS) in northwest Scotland during the last glacial maximum (LGM) and provides additional age constraints on a local late-glacial readvance known as the Wester Ross Readvance. The results suggest that glacial-isostatic adjustment (GIA) during deglaciation does not necessarily induce a stabilizing RSL change to marine-based ice streams. The RSL field at the front of individual ice streams may be governed by the regional GIA signal driven by the ice sheet as a whole.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Igor Girault, Dominique Todisco, Attila Ciner, Mehmet Akif Sarikaya, Cengiz Ylldlrlm, Alinelie Quiquerez, Fabiana Martin, Luis Borrero, Derek Fabel, Philippe Grandjean, Carole Nehme, Damase Mouralis
Summary: This study provides a detailed chronology of deglaciation and lake regression in the Cerro Benitez area near the Southern Patagonian Ice Field. The results show that the ice sheet locally thinned by at least 300 meters after a major glacial advance, and the ice-dammed lake experienced slow local regression followed by faster regression. The study also discusses the implications for megafaunal colonization in the area.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Yu Liu, Xianbin Liu, Shijie Wang, Sheng Xu, Rob M. Ellam, Derek Fabel, Jing Chen
Summary: This study provides a thorough chronostratigraphic analysis of the Yangtze River Delta using cosmogenic nuclide data, revealing the absolute age of sediment horizons and the southward migration history of the Yangtze River channel.
Article
Geography, Physical
Duanne A. White, David Fink, Kat Lilly, Phil O'Brien, Boris Dorschel, Sonja Berg, Ole Bennike, Damian B. Gore, Derek Fabel, Marcello Blaxell, Matt Jeromson, Alexandru T. Codilean, Klaus M. Wilken, Ben Galton-Fenzi, Bernd Wagner
Summary: In this study, the dynamics and paleo-geometry of the ice sheet in eastern Prydz Bay were explored, revealing rapid retreat of the ice sheet during deglacial events. The findings are crucial for understanding the response of the ice sheet to past and future environmental changes.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
David Stevens, Jeremy C. Ely, Stephen J. Livingstone, Chris D. Clark, Frances E. G. Butcher, Ian Hewitt
Summary: This study utilizes a mathematical model to investigate the impact of basal topography and ice surface slope on sediment transport and deposition within a water-filled subglacial channel. The study identifies three distinct zones with different behaviors, including upstream deposition, downstream transport, and high-rate deposition near the ice margin. The thickness and steepness of the ice sheet have significant effects on the deposition rates.
JOURNAL OF GLACIOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Josephine Hornsey, Ann Rowan, Martin P. Kirkbride, Stephen J. Livingstone, Derek Fabel, Angel Rodes, Duncan J. Quincey, Bryn Hubbard, Vincent Jomelli
Summary: Observations of glacier behavior in the Everest region of Nepal revealed seven glacial stages in the Holocene period, which correlate with similar stages in the monsoon-influenced Himalaya region, demonstrating a coherent record of high elevation terrestrial palaeoclimate change that can be extracted from dynamic mountain landscapes.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2022)
Article
Geography, Physical
Jeremy C. Ely, David Stevens, Chris D. Clark, Frances E. G. Butcher
Summary: The formation of subglacial bedforms has been a scientific inquiry for over a century and is now important for understanding ice-sheet dynamics. Using a numerical model, researchers have found that instabilities at the ice-bed interface result in subglacial ribbed moraines and drumlins. They also discovered a behavioral trajectory in which subglacial ribs can develop into either organized drumlin fields or misaligned structures. The model provides an explanation for subglacial bedform initiation and their evolutionary trajectories.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Geography, Physical
Mark L. Pittard, Pippa L. Whitehouse, Michael J. Bentley, David Small
Summary: This study presents a new model ensemble for post-Last Glacial Maximum Antarctic deglaciation reconstructions, which is tested against geological constraints. The results provide insights into the characteristics of past ice sheet changes and have implications for predicting future sea-level rise.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Christopher T. Lloyd, Chris D. Clark, Darrel A. Swift
Summary: Overdeepenings are erosional landforms formed by glaciers that cut into bedrock in basins and valleys. The process of overdeepening is important as it can affect how ice masses respond to climate changes. Through analyzing digital elevation models, we found that overdeepenings are primarily located at confluences of glacial valleys, where ice flow speeds up due to changes in valley cross-sectional area. The depth of overdeepenings is correlated with the magnitude of ice flow speed-up, particularly in areas near geological fault-zones. Our findings support the hypothesis that overdeepening is initiated by an increase in ice velocity and highlight the importance of fractured bedrock in the process. These findings have implications for landscape evolution modeling and can be used in model testing.
GEOGRAFISKA ANNALER SERIES A-PHYSICAL GEOGRAPHY
(2023)
Article
Geography, Physical
Sarah L. L. Bradley, Jeremy C. C. Ely, Chris D. D. Clark, Robin J. J. Edwards, Ian Shennan
Summary: By utilizing new data from the BRITICE-CHRONO project, we have improved the reconstruction of the palaeo-sea level of Britain and Ireland and compared it to the relative sea level record. We have tested different ice thickness scenarios and demonstrated the potential of regional sea level data to distinguish between glaciation scenarios. Our method also impacts predictions of contemporary vertical land motion.
JOURNAL OF QUATERNARY SCIENCE
(2023)
Article
Geography, Physical
Frances E. G. Butcher, Neil S. Arnold, Matthew R. Balme, Susan J. Conway, Christopher D. Clark, Colman Gallagher, Axel Hagermann, Stephen R. Lewis, Alicia M. Rutledge, Robert D. Storrar, Savana Z. Woodley
Summary: Until recently, it was believed that the influence of basal liquid water on the evolution of buried glaciers in Mars' mid latitudes was negligible. However, the recent discovery of landforms interpreted as eskers associated with these glaciers challenges this assumption. These findings indicate a more complex mid-to-late Amazonian environment on Mars than previously thought, raising questions about their abundance, distribution, melting dynamics, and the fate of meltwater. Opportunities for collaboration between Mars and Earth cryosphere research communities arise from these questions.
ANNALS OF GLACIOLOGY
(2023)
Article
Geography, Physical
R. E. Archer, J. C. Ely, T. J. Heaton, F. E. G. Butcher, A. L. C. Hughes, C. D. Clark
Summary: Palaeo-ice sheets leave behind subglacial lineations, which contain valuable information about the direction of ice flow. The information provided by these lineations is currently underutilised due to the lack of rigorous model-data comparison techniques. This study presents the LALA tool, which allows for a quantitative assessment of ice sheet simulations by comparing simulated and observed lineations. The application of LALA to simulations of the British-Irish Ice Sheet demonstrates its usefulness in identifying the best-fit simulations.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Geography, Physical
Jean Verite, Stephen J. Livingstone, Edouard Ravier, Isabelle Mcmartin, Janet Campbell, Emma L. M. Lewington, Nico Dewald, Chris D. Clark, Andrew J. Sole, Robert D. Storrar
Summary: This article reviews the subglacial meltwater landforms in northern Canada and Fennoscandia, summarizes their characteristics, formation processes, and spatial distributions, and establishes a conceptual model to explain the evolution of subglacial drainage systems. Additionally, the article proposes future research directions to improve understanding of subglacial hydrology and bedform diversity.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Geosciences, Multidisciplinary
Tancrede P. M. Leger, Andrew S. Hein, Angel Rodes, Robert G. Bingham, Irene Schimmelpfennig, Derek Fabel, Pablo Tapia
Summary: This study aims to better understand the drivers of spatio-temporal variability in ice sheet evolution by establishing reliable chronologies of former outlet-glacier advances. It finds that the Southern Westerly Winds and the Antarctic Circumpolar Current have a significant influence on the Patagonian Ice Sheet, making it a powerful indicator of climate change. The study also reveals at least three pre-Last Glacial Cycle stadials in northern Patagonia, which are related to summer insolation intensity and colder winters.
CLIMATE OF THE PAST
(2023)
Article
Environmental Sciences
Jane L. Andersen, Jennifer C. Newall, Ola Fredin, Neil F. Glasser, Nathaniel A. Lifton, Finlay M. Stuart, Derek Fabel, Marc Caffee, Vivi K. Pedersen, Alexandria J. Koester, Yusuke Suganuma, Jonathan M. Harbor, Arjen P. Stroeven
Summary: This study quantifies the long-term ice cover of mountains in western Dronning Maud Land and finds that coastal areas have experienced longer periods of ice burial compared to inland areas. The escarpment in Dronning Maud Land acts as a hinge-zone, attenuating ice-dynamic changes inland and influencing ice-thickness variations.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)