Article
Geography, Physical
Dag Ottesen, Christine L. Batchelor, Lilja R. Bjarnadottir, Daniel Hesjedal Wiberg, Julian A. Dowdeswell
Summary: The analysis of glacial landforms on continental margins provides insights into sedimentation processes beneath ice sheets and aids predictions of future ice sheet resilience. This study used high-resolution marine-geophysical data to map and interpret glacial landforms along the mid-Norwegian margin, revealing the dynamic behavior of the Scandinavian Ice Sheet during the last glacial-interglacial cycle. The geometry of the continental shelf played a key role in controlling the pattern of ice-sheet retreat.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Mohamed S. Elhebiry, Mohamed Sultan, Abotalib Z. Abotalib, Alan E. Kehew, Peter J. Voice, Ibrahim Abu El-Leil
Summary: This study provides evidence for a Late Ordovician glacial origin of streamlined landforms in Arabia and reconstructs the Late Ordovician ice sheet. The results support the existence of a significant and dynamic ice sheet during the Late Ordovician period and provide new morphological constraints for paleo-climate models.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geography, Physical
Halley M. Mastro, Sarah M. Principato, Ilana B. Sobel, Ivar Orn Benediktsson, Nina Aradottir
Summary: This study investigates the potential of ice scour lake morphology and density as a proxy for paleo-ice flow direction and basal thermal regime. GIS analysis was used to examine ice scour lakes in regions with different rates of ice flow during and after the Last Glacial Maximum. The results show that ice scour lake density, packing, and elevation are highest in the Vestfiroir region, indicating the presence of an independent ice cap. Differential intensity of glacial erosion and lake orientation support the proposed ice divide in the Bakkaheioi region.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Geography, Physical
Nina Aradottir, Ivar Oern Benediktsson, Olafur Ingolfsson, Skafti Brynjolfsson, Wesley R. Farnsworth, Margret Mjoell Benjaminsdottir, Lena Bjoerg Rikhardsdottir
Summary: This study focuses on the shutdown phase of ice streams during deglaciation, which is different from their active flow phase. Mapping of streamlined subglacial bedforms in northeast Iceland reveals the presence of crevasse-squeeze ridges, indicating ice stagnation and waning of ice streaming during the Younger Dryas period. The morphological differences of these ridges suggest different kinematic settings within the ice streams.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Geography, Physical
Ivar Orn Benediktsson, Nina Aradottir, Olafur Ingolfsson, Skafti Brynjolfsson
Summary: This study reconstructs paleo-ice streams in NE-Iceland based on subglacial bedform mapping, revealing key information on ice sheet dynamics and evolution.
Article
Geosciences, Multidisciplinary
Alicia Vasquez, Valentina Flores-Aqueveque, Esteban Sagredo, Rodrigo Hevia, Rodrigo Villa-Martinez, Patricio I. Moreno, Jose L. Antinao
Summary: The evolution and age of large ice-dammed lakes along the eastern margin of the Patagonian Ice Sheet were studied, providing valuable insights into fluctuations of the shrinking ice sheet, isostatic adjustments, and climate forcing.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Holly Kyeore Han, Natalya Gomez, David Pollard, Robert DeConto
Summary: The study demonstrates that solid Earth deformation and gravitational field perturbations have significant impacts on the evolution of Northern Hemisphere ice sheets, enhancing terrestrial ice sheets during growth phases and stabilizing marine-based ice sheets during retreat phases.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geography, Physical
Aleksandr Montelli, Marina Solovyeva, Grigorii Akhmanov, Adriano Mazzini, Anna Piatilova, Elena Bakay, Julian A. Dowdeswell
Summary: New geophysical data from eastern Storbanken in the central Barents Sea reveals the flow of a marine-based ice dome during the final stages of ice-sheet decay. Previous models suggesting a northward-migrating ice dome or crest extending from Svalbard to Franz-Josef Land are contradicted by our findings. The results provide valuable insights into the late-stage decay of marine ice domes and can be used to improve numerical models simulating the behavior of marine-based ice sheets in a warming environment.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Sangbeom Ha, Ester Colizza, Fiorenza Torricella, Leonardo Langone, Federico Giglio, Gerhard Kuhn, Patrizia Macri, Boo-Keun Khim
Summary: This study examines changes of glaciomarine sedimentation on the continental slope and rise of the central Ross Sea, and finds that sedimentation rate decreases with water depth, with higher rates during deglacial and glacial periods. Biological productivity is higher during glacial period compared to interglacial period.
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
Geography, Physical
Kwangchul Jang, Youngkyu Ahn, Young Jin Joe, Carmen A. Braun, Young Ji Joo, Jung-Hyun Kim, Germain Bayon, Matthias Forwick, Christoph Vogt, Seung-Il Nam
Summary: The study of the glacimarine sediment core off northern Svalbard provides insights into the variability of sediment provenance and chemical weathering patterns since the last deglaciation, allowing for the identification of distinct paleoclimate events. The dataset indicates retreat and re-advance phases of the Svalbard-Barents Sea Ice Sheet, as well as prolonged supply of radiogenic detrital Nd isotopes, highlighting the utility of Nd isotopes as a proxy for reconstructing paleo-cryosphere changes.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geosciences, Multidisciplinary
Christo Buizert
Summary: Ice cores provide detailed records of past climate change. The gas age-ice age difference (Delta age) is a powerful proxy for past surface temperature. A new method is developed to estimate past temperatures of the ice sheet surface using changes in ice core Delta age, with some densification models showing insufficient sensitivity to accumulation rates.
GEOPHYSICAL RESEARCH LETTERS
(2021)
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
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
Ingrid Leirvik Olsen, Jan Sverre Laberg, Matthias Forwick, Tom Arne Rydningen, Katrine Husum
Summary: This study reconstructs the Late Weichselian and Holocene glacial history of a NE Greenland fjord system, shedding light on the retreat patterns and chronologies of major marine-terminating outlet glaciers. The findings reveal that the retreat of glaciers during deglaciation was characterized by periodic pauses and readvances. The fjord system was mostly deglaciated prior to 7.8 Ica cal BP, with an estimated average retreat rate ranging between 33 and 96 m a(-1). Sediment analysis indicates that the retreat of glaciers had a significant impact on the deposition in the fjord system. The overall control factor was attributed to increased ice melting from enhanced Northern Hemisphere summer insolation during the Early Holocene.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geology
Lukas W. M. Becker, Berit O. Hjelstuen, Eivind W. N. Storen, Hans Petter Sejrup
Article
Multidisciplinary Sciences
Benjamin Bellwald, Sverre Planke, Lukas W. M. Becker, Reidun Myklebust
NATURE COMMUNICATIONS
(2020)
Article
Geology
Benjamin Bellwald, Valentin Nigg, Stefano C. Fabbri, Lukas W. M. Becker, Adrian Gilli, Flavio S. Anselmetti
Summary: This study aims to evaluate the paleoseismic activity in southeastern Switzerland by analyzing the sedimentary record of Lake Silvaplana. The analysis of acoustic exploration data from the lake floor reveals that four large landslide events have occurred in the last 1400 years, which is consistent with sediment records from other lakes. This provides a reliable record of seismic activity during the mid and Late Holocene in the region, likely related to the neotectonic activity of the Engadine Line.
Article
Meteorology & Atmospheric Sciences
Lukas W. M. Becker, Hans Petter Sejrup, Berit O. Hjelstuen, Haflidi Haflidason, Heidi Kjennbakken, Johannes P. Werner
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2020)