Article
Geography, Physical
Nina-Marie Lesic, Katharina Teresa Streuff, Gerhard Bohrmann, Gerhard Kuhn
Summary: South Georgia, a sub-Antarctic island in the Southern Ocean, exhibits highly dynamic ice cap waxing and waning, as well as geomorphological and sedimentological changes. This study provides new evidence of a shelf-wide glaciation during the Last Glacial Maximum (LGM) and suggests rapid, but stepwise ice retreat during deglaciation. The findings contribute to a better understanding of the glacial history and climate variability in this region.
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
Lukas Rettig, Sven Lukas, Matthias Huss
Summary: This study investigates the formation processes, preservation potential, and climatic significance of annually formed moraine ridges in the foreland of Gorner-gletscher, Switzerland. The results show that the formation of ice-marginal moraines is mainly controlled by several mechanisms, including sediment freezing, ice-cored moraine formation, bulldozing of pre-existing sediments, and incorporation of dead ice. The distribution of these mechanisms depends on climatological, topographical, and glaciological boundary conditions, with the slope of the ice margin being the most important factor. The retreat rates of the glacier can be calculated based on the largest and most well-defined moraines, which show a statistically significant correlation with annual air temperature anomalies.
QUATERNARY SCIENCE REVIEWS
(2023)
Review
Geosciences, Multidisciplinary
D. P. Le Heron, M. E. Busfield, X. Chen, M. Corkeron, B. J. Davies, P. Dietrich, J-F. Ghienne, C. Kettler, L. Scharfenberg, T. M. Vandyk, R. Wohlschlaegl
Summary: Studying the deep time glacial record is crucial for understanding the long-term changes of the global cryosphere. While sedimentological description and interpretation have traditionally been important, new technologies such as aerial and satellite imagery, unmanned aerial vehicles, and 3D rendering software offer new opportunities for insights. This paper showcases examples from different time periods and regions where these approaches have revolutionized the understanding of ancient glaciations.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Multidisciplinary Sciences
B. Rick, D. Mcgrath, S. W. Mccoy, W. H. Armstrong
Summary: A study focusing on the Alaska region reveals that the frequency of glacial lake outburst floods did not significantly increase over the past 35 years. However, the total lake volume decreased, leading to a reduction in regional flood hazard. The study also suggests that outburst floods have been historically underreported and calls for systematic research in other areas.
NATURE COMMUNICATIONS
(2023)
Article
Geography, Physical
Zoe A. Roseby, James A. Smith, Claus -Dieter Hillenbrand, Matthieu J. B. Cartigny, Brad E. Rosenheim, Kelly A. Hogan, Claire S. Allen, Amy Leventer, Gerhard Kuhn, Werner Ehrmann, Robert D. Larter
Summary: Reconstructing the glacial history of Anvers-Hugo Trough on the western Antarctic Peninsula, this study provides insights into the past advance and retreat of the Antarctic Peninsula Ice Sheet. The research reveals that the ice sheet reached its maximum extent around 23-19 thousand years ago and had retreated to the middle shelf by 15.7 thousand years ago. The retreat rates varied across different sections of the continental shelf, with faster retreat observed from the outer to middle shelf compared to the middle to inner shelf.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Environmental Sciences
Justyna Dudek, Iwo Wieczorek, Mateusz K. Suwinski, Mateusz C. Strzelecki
Summary: This study reveals the rate of glacier retreat and associated paraglacial transformation in the Gasbreen foreland of Svalbard. The investigation shows that Gasbreen has been experiencing continuous recession since 1938, with accelerated retreat after 1990. This has led to an increase in the foreland area of the glacier from 2.2 to 5.8 km(2).
LAND DEGRADATION & DEVELOPMENT
(2023)
Article
Geography, Physical
Lauren M. Simkins, Sarah L. Greenwood, Monica C. M. Winsborrow, Lilja R. Bjarnadottir, Allison P. Lepp
Summary: Meltwater drainage beneath ice sheets plays a crucial role in understanding ice-bed conditions and ice flow, impacting terminus behavior and ice-shelf mass balance. By studying the geological record of former ice sheets, including sediments and landforms on land and the seafloor, we can gain insights into the evolution of efficient and inefficient drainage systems of ice sheets and their effect on ice-sheet behavior. This article highlights the progress made in geological studies over the past decade, providing process-based information on subglacial hydrology, and discussing how these studies inform theory, numerical models, and contemporary observations.
ANNALS OF GLACIOLOGY
(2023)
Article
Geography, Physical
Sarah Kamleitner, Susan Ivy-Ochs, Giovanni Monegato, Franco Gianotti, Naki Akcar, Christof Vockenhuber, Marcus Christl, Hans-Arno Synal
Summary: We present a new glacier chronology of the Ticino-Toce glacier in the Southern Alps, reconstructing the timing and extent of its Last Glacial Maximum advance with detailed landform relationships and surface exposure dating. The study reveals that the glacier remained relatively stable with only minor oscillations over a period of approximately 5000 years, and the Verbano piedmont lobe was larger than previously thought. Additionally, the research suggests synchronized glacier advances across the Western Alps, except for the southwestern massifs.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Ping Wang, Huiying Wang, Gang Hu, Yukui Ge, Tao Liu, Bo Xu
Summary: The research on the Yarlung Tsangpo Gorge suggests that glacial dams have had a significant impact on the geomorphological evolution of the southeastern Tibetan Plateau.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geography, Physical
Parvendra Kumar, Milap Chand Sharma, Sanjay Deswal, Ishita Manna, Elora Chakraborty, Satya Prakash
Summary: This study investigates the sequential evolution of glacial-landforms in relation to paleo-climate in the Zemu and East-Rathong Glaciers valleys in Sikkim, Eastern Himalaya. The study relies on field-based geomorphological mapping and geospatial datasets to establish glacial chronology. The findings suggest four glacial stages during the Late Quaternary period, corresponding to the Last Glacial Maximum, Younger Dryas, Late-Holocene, and Little Ice Age. These stages are synchronous with glaciations in neighboring regions but differ from the westerly dominated NW Himalayas.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geography, Physical
Dominic A. Hodgson, Stephen J. Roberts, Enaut Izagirre, Bianca B. Perren, Francois De Vleeschouwer, Sarah J. Davies, Thomas Bishop, Robert D. Mcculloch, Juan -Carlos Aravena
Summary: The southern limit of the Patagonian Ice Sheet at glacial maxima is poorly understood due to a lack of field data. However, new findings suggest that an ice stream from Cordillera Darwin extended southwards to Isla Hermite and Cape Horn. This provides valuable insights into the extent of the ice sheet during retreat.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geography, Physical
Joni Makinen, Kari Kajuutti, Antti E. K. Ojala, Elina Ahokangas, Aleksi Tuunainen, Markus Valkama, Jukka-Pekka Palmu
Summary: The purpose of this paper is to describe the structure and composition of subglacial landforms called murtoos in order to understand their formation and depositional environment. Murtoos have been found in Finland and Sweden and are likely to exist in all areas covered by past ice sheets. They occur in fields along subglacial meltwater routes and are composed of sandy and gravelly sediments interbedded with sorted sediments. Murtoos were formed by sediment-concentrated flows during weak glaciotectonic deformation, indicating near-zero pressure.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Geography, Physical
Konstanze Stuebner, Bodo Bookhagen, Silke Merchel, Johannes Lachner, Mustafo Gadoev
Summary: The study in Bartang valley of northwestern Pamir utilizes cosmogenic Be-10 exposure ages to establish the timing and locations of glacial activities during the Middle Pleistocene, and highlights the instability of glacial sediments through catastrophic mega debris flows occurring after glacial retreat, with remobilized sediments providing valuable age constraints on glacial histories. The developed Gaussian separation algorithm allows for regional comparison of glacial chronologies, providing a summary of Middle and early Late Pleistocene glacial cycles in western High-Mountain Asia.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geography, Physical
Stephanie Heath, Brenda L. Hall, George H. Denton, Gideon M. Henderson, Chris H. Hendy
Summary: An understanding of Antarctic Ice Sheet (AIS) behavior is crucial for predicting future sea-level rise. This study investigates the ice-sheet history in the McMurdo Sound region of the western Ross Sea over the past two glacial cycles. The findings suggest that ice expansion in this area is driven by low Antarctic air temperatures, potentially influenced by ocean dynamics. Moreover, the timing of ice retreat and maximum extent differs from global events, indicating the impact of accumulation on ice-sheet mass balance.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geology
Jordan Blair Reglin Eamer, Dan Hirsh Shugar, Ian James Walker, Olav B. Lian, Christina M. Neudorf
JOURNAL OF SEDIMENTARY RESEARCH
(2017)
Article
Geosciences, Multidisciplinary
Daniel H. Shugar, John J. Clague, James L. Best, Christian Schoof, Michael J. Willis, Luke Copland, Gerard H. Roe
Article
Geography
D. H. Shugar, K. A. Colorado, J. J. Clague, M. J. Willis, J. L. Best
Article
Geology
A. Dufresne, M. Geertsema, D. H. Shugar, M. Koppes, B. Higman, P. J. Haeussler, C. Stark, J. G. Venditti, D. Bonno, C. Larsen, S. P. S. Gulick, N. McCall, M. Walton, M. G. Loso, M. J. Willis
SEDIMENTARY GEOLOGY
(2018)
Article
Environmental Sciences
Umesh K. Haritashya, Jeffrey S. Kargel, Dan H. Shugar, Gregory J. Leonard, Katherine Strattman, C. Scott Watson, David Shean, Stephan Harrison, Kyle T. Mandli, Dhananjay Regmi
Article
Multidisciplinary Sciences
Bretwood Higman, Dan H. Shugar, Colin P. Stark, Goran Ekstrom, Michele N. Koppes, Patrick Lynett, Anja Dufresne, Peter J. Haeussler, Marten Geertsema, Sean Gulick, Andrew Mattox, Jeremy G. Venditti, Maureen A. L. Walton, Naoma McCall, Erin Mckittrick, Breanyn MacInnes, Eric L. Bilderback, Hui Tang, Michael J. Willis, Bruce Richmond, Robert S. Reece, Chris Larsen, Bjorn Olson, James Capra, Aykut Ayca, Colin Bloom, Haley Williams, Doug Bonno, Robert Weiss, Adam Keen, Vassilios Skanavis, Michael Loso
SCIENTIFIC REPORTS
(2018)
Article
Geosciences, Multidisciplinary
P. J. Haeussler, S. P. S. Gulick, N. McCall, M. Walton, R. Reece, C. Larsen, D. H. Shugar, M. Geertsema, J. G. Venditti, K. Labay
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2018)
Article
Environmental Sciences
Dan H. Shugar, Aaron Burr, Umesh K. Haritashya, Jeffrey S. Kargel, C. Scott Watson, Maureen C. Kennedy, Alexandre R. Bevington, Richard A. Betts, Stephan Harrison, Katherine Strattman
NATURE CLIMATE CHANGE
(2020)
Article
Multidisciplinary Sciences
D. H. Shugar, M. Jacquemart, D. Shean, S. Bhushan, K. Upadhyay, A. Sattar, W. Schwanghart, S. McBride, M. Van Wyk de Vries, M. Mergili, A. Emmer, C. Deschamps-Berger, M. McDonnell, R. Bhambri, S. Allen, E. Berthier, J. L. Carrivick, J. J. Clague, M. Dokukin, S. A. Dunning, H. Frey, S. Gascoin, U. K. Haritashya, C. Huggel, A. Kaab, J. S. Kargel, J. L. Kavanaugh, P. Lacroix, D. Petley, S. Rupper, M. F. Azam, S. J. Cook, A. P. Dimri, M. Eriksson, D. Farinotti, J. Fiddes, K. R. Gnyawali, S. Harrison, M. Jha, M. Koppes, A. Kumar, S. Leinss, U. Majeed, S. Mal, A. Muhuri, J. Noetzli, F. Paul, I Rashid, K. Sain, J. Steiner, F. Ugalde, C. S. Watson, M. J. Westoby
Summary: On February 7, 2021, a catastrophic mass flow hit the Ronti Gad, Rishiganga, and Dhauliganga valleys in Chamoli, Uttarakhand, India, causing extensive devastation and casualties. The collapse of rock and glacier ice led to a debris flow that transported large boulders and scoured valley walls, highlighting issues related to monitoring and sustainable development in high-mountain environments like the Himalayas.
Article
Geosciences, Multidisciplinary
Audrey M. Dunham, Eric Kiser, Jeffrey S. Kargel, Umesh K. Haritashya, C. Scott Watson, Dan H. Shugar, Amanda Hughes, Peter G. DeCelles
Summary: Landslides triggered by earthquake shaking in active mountain regions are a significant hazard. The relationship between topographic amplification and landsliding is poorly understood. This study investigates the link between low-frequency ground shaking, topographic amplification, and landslide distribution from the 2015 Gorkha, Nepal earthquake using numerical methods. Results show that topographic amplification is one of the key factors for understanding where large and potentially devastating landslides are likely to occur during future major earthquakes.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Review
Geosciences, Multidisciplinary
John J. J. Clague, Dan H. H. Shugar
Summary: Global atmospheric warming is causing unprecedented physical and biotic changes in Earth's high mountains. This paper summarizes the changes in glacierized mountains in northwest North America, including reduction in glacier ice and permafrost, increase in slope instability and landslides, hydrological changes, and changing aquatic ecosystems. The continuing increase in greenhouse gas concentrations and mountain warming will likely lead to even more dramatic changes in high-mountain environments.
Article
Geography, Physical
William D. Smith, Stuart A. Dunning, Neil Ross, Jon Telling, Erin K. Jensen, Dan H. Shugar, Jeffrey A. Coe, Marten Geertsema
Summary: The frequency of large supraglacial landslides in glacial environments is increasing due to climate warming and permafrost degradation. However, detection biases make it difficult to test, establish cause-effect relationships, and determine lag-times. In this study, the Google Earth Engine was used to analyze Glacier Bay National Park & Preserve in Alaska, revealing an underestimation of rock avalanches (RAs) by 53% and a bias towards large area RAs. RA sources clustered spatially at high elevations and temporally between May and September, when air temperatures were high enough to initiate rock-permafrost degradation mechanisms. Understanding the global contribution of RAs to glacial sediment budgets requires further investigation in other glaciated regions.
Article
Geography, Physical
Jordan B. R. Eamer, Daniel H. Shugar, Ian J. Walker, Christina M. Neudorf, Olav B. Lian, Jennifer L. Eamer, Jordan Bryce, Libby Biln
Article
Geography, Physical
Stephan Harrison, Jeffrey S. Kargel, Christian Huggel, John Reynolds, Dan H. Shugar, Richard A. Betts, Adam Emmer, Neil Glasser, Umesh K. Haritashya, Jan Klimes, Liam Reinhardt, Yvonne Schaub, Andy Wiltshire, Dhananjay Regmi, Vit Vilimek