Article
Environmental Sciences
Benjamin M. Jones, Ken D. Tape, Jason A. Clark, Allen C. Bondurant, Melissa K. Ward Jones, Benjamin V. Gaglioti, Clayton D. Elder, Chandi Witharana, Charles E. Miller
Summary: The study documents the impact of beaver activity on a small creek valley in Alaska's Seward Peninsula, showcasing changes in vegetation and landscape due to beaver engineering. This highlights the significant role beavers play in shaping ice-rich permafrost landscapes.
Article
Environmental Sciences
Zelalem A. Mekonnen, William J. Riley, Robert F. Grant, Verity G. Salmon, Colleen M. Iversen, Sebastien C. Biraud, Amy L. Breen, Mark J. Lara
Summary: Observations suggest that shrubs are expanding in the Arctic tundra due to climate warming, with topography playing a key role in determining shrub expansion by influencing water and nutrient dynamics. The study highlights the importance of considering hillslope-scale coupled surface and subsurface hydrology in land models to accurately predict current plant distributions and future trajectories in Arctic ecosystems.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Geography, Physical
Joseph P. Tulenko, Jason P. Briner, Nicolas E. Young, Joerg M. Schaefer
Summary: The study reports the chronology of moraine crests in the western Alaska Range, indicating the culmination of the regional Last Glacial Maximum around 21-19 ka. The retreat of glaciers in Alaska experienced periods of steady recession and accelerated retreat, influenced by various climate factors. The findings suggest that glacier retreat in Alaska was sensitive to factors such as warming, global warming, and ocean circulation.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Environmental Sciences
Julian Dann, Katrina E. Bennett, W. Robert Bolton, Cathy J. Wilson
Summary: This study analyzed the factors controlling summer root-zone soil moisture in a 4500 km(2) area on the Seward Peninsula of Alaska, showing that vegetation primarily controls soil moisture in shallow soil layers, while topography and meteorological factors play a larger role in deeper layers. The random forest model developed accounted for 40% to 60% of the observed variation, indicating the importance of secondary factors in influencing root-zone soil moisture distribution.
Article
Computer Science, Interdisciplinary Applications
Fengming Yuan, Dali Wang, Shih-Chieh Kao, Michele Thornton, Daniel Ricciuto, Verity Salmon, Colleen Iversen, Peter Schwartz, Peter Thornton
Summary: This study presents a computational framework for land surface simulation using the E3SM land model at an unprecedented resolution. The framework was implemented to simulate a 1 km x 1 km terrestrial ecosystem over the Seward Peninsula in Alaska. The results provide insights into the temporal and spatial variations of water, energy, and carbon cycles in high-latitude Arctic ecosystems.
JOURNAL OF COMPUTATIONAL SCIENCE
(2023)
Article
Meteorology & Atmospheric Sciences
Ting Wang, Na Wang, Dabang Jiang
Summary: We investigate changes in the intertropical convergence zone (ITCZ) during the last glacial maximum (LGM) using multiple simulations. Most models show that the LGM ITCZ shifts southward, narrows, and weakens on a global scale. Regionally, the central and eastern Pacific show the largest position and intensity changes, while the Indian Ocean-western Pacific experience the most obvious width changes. The September-October-November and June-July-August seasons contribute the most to the annual ITCZ changes globally and in most regions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Geosciences, Multidisciplinary
J. M. Lora, C. B. Skinner, W. D. Rush, S. H. Baek
Summary: Proxy reconstructions and model simulations show that the hydroclimate during the Last Glacial Maximum was mainly influenced by ice sheets, causing reductions in moisture transport and precipitation globally, except for increases in precipitation over Patagonia, Iberia, and southwestern North America.
GEOPHYSICAL RESEARCH LETTERS
(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
Geosciences, Multidisciplinary
Minda Moriah Monteagudo, Jean Lynch-Stieglitz, Thomas M. Marchitto, Matthew W. Schmidt
Summary: This study reveals that the central equatorial Pacific cooled by about 2.0 degrees Celsius during the Last Glacial Maximum, contradicting previous estimates but aligning with climate models. This suggests a larger magnitude of cooling in the tropical region during the LGM, implying a higher equilibrium climate sensitivity.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
April S. Dalton, Chris R. Stokes, Christine L. Batchelor
Summary: By synthesizing geochronological data, stratigraphic and geomorphological data, as well as numerical modeling output, we reconstructed the Laurentide and Innuitian ice sheets during the last glacial cycle. Our findings suggest that there were multiple cycles of rapid ice sheet growth and decay in different areas of North America between 115 ka and 25 ka, leading to significant changes in global mean sea level and landscape evolution.
EARTH-SCIENCE REVIEWS
(2022)
Article
Biochemistry & Molecular Biology
Flavio Augusto da Silva Coelho, Stephanie Gill, Crystal M. Tomlin, Marilena Papavassiliou, Sean D. Farley, Joseph A. Cook, Sarah A. Sonsthagen, George K. Sage, Timothy H. Heaton, Sandra L. Talbot, Charlotte Lindqvist
Summary: During the Late Pleistocene, there were ice sheets covering parts of North America. However, it is unclear whether ice-free refugia existed in the Alexander Archipelago along the SE Alaska coast during the last glacial maximum (LGM). Genetic analyses of black and brown bears in SE Alaska show that there were two subclades of black bears, one preglacial and one postglacial, that diverged over 100,000 years ago. Ancient brown bears are closely related to modern brown bears in the archipelago, suggesting colonization after the LGM. These findings suggest that there were no refugia in SE Alaska during the LGM, but vegetation quickly expanded after deglaciation.
Article
Geochemistry & Geophysics
George N. D. Case, Susan M. Karl, Sean P. Regan, Craig A. Johnson, Eric T. Ellison, Jonathan Saul Caine, Christopher S. Holm-Denoma, Laura S. Pianowski, Jeffrey H. Marsh
Summary: Graphite Creek is an unusual flake graphite deposit located in Alaska, USA. The deposit is within the second metamorphic zone of Kigluaik Mountains gneiss dome and contains high-grade graphite lenses along with various minerals. The formation of these lenses is believed to be synchronous with high-temperature metamorphism and anatexis of a carbonaceous protolith.
MINERALIUM DEPOSITA
(2023)
Article
Geography, Physical
Adriano Ribolini, Matteo Spagnolo, Andrew J. Cyr, Paolo Roberto Federici
Summary: This study investigates the Last Glacial Maximum (LGM) and the early retreat glacial phases in the Stura Valley of the Maritime Alps through the combination of geomorphologic surveys, glacial modelling, and 10Be exposure ages of boulders on moraines. The research reveals a consistent glacial response in the Maritime Alps to climatic forcing, with minimal variation in the mass balance of glaciers. The study also confirms the synchronicity of LGM recessional standstills or readvances in the Southern Alps.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Jing Lei, Zhengguo Shi, Xiaoning Xie, Xinzhou Li
Summary: Based on climate model experiments, this study found that the precipitation during the Last Glacial Maximum (LGM) was significantly different from that of the preindustrial period in the terrestrial monsoon regions and arid regions of the Northern Hemisphere. The decrease in sea surface temperature and expansion of the ice sheet were the main contributors to lessening precipitation in the monsoon regions, while the decrease in precipitation in the arid regions can be mainly attributed to ice-sheet-induced albedo and topography changes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Asmita Banerjee, Laurence Y. Yeung, Lee T. Murray, Xin Tie, Jessica E. Tierney, Allegra N. Legrande
Summary: Ice cores and other paleotemperature proxies provide information about past surface temperatures, but little is known about high-altitude temperatures. This study uses the clumped-isotope composition of molecular oxygen in ice cores to infer that the upper troposphere was 6-9 degrees C cooler during the Last Glacial Maximum than during the late preindustrial Holocene.
Article
Geography, Physical
Mateusz Plociennik, Andrzej Kruk, Jacek Forysiak, Dominik Pawlowski, Kamila Mianowicz, Scott Elias, Ryszard K. Borowka, Marek Kloss, Milena Obremska, Russell Coope, Marek Krapiec, Piotr Kittel, Slawomir Zurek
Review
Geography, Physical
Scott A. Elias
QUATERNARY SCIENCE REVIEWS
(2015)
Review
Geography, Physical
Ian Candy, Tom S. White, Scott Elias
JOURNAL OF QUATERNARY SCIENCE
(2016)
Article
Multidisciplinary Sciences
Leslea J. Hlusko, Joshua P. Carlson, George Chaplin, Scott A. Elias, John F. Hoffecker, Michaela Huffman, Nina G. Jablonski, Tesla A. Monson, Dennis H. O'Rourke, Marin A. Pilloud, G. Richard Scott
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2018)
Article
Geography, Physical
P. Kittel, J. Sikora, O. Antczak, S. J. Brooks, S. Elias, M. Krapiec, T. P. Luoto, R. K. Borowka, D. Okupny, D. Pawlowski, M. Plociennik, M. Rzodkiewicz, R. Stachowicz-Rybka, A. Wacnik
QUATERNARY INTERNATIONAL
(2018)
Article
Anthropology
Piotr Kittel, Blazej Muzolf, Mateusz Plociennik, Scott Elias, Stephen J. Brooks, Monika Lutynska, Dominik Pawlowski, Renata Stachowicz-Rybka, Agnieszka Wacnik, Daniel Okupny, Zbigniew Glab, Aldona Mueller-Bieniek
JOURNAL OF ARCHAEOLOGICAL SCIENCE
(2014)
Article
Geography, Physical
Ian M. Miller, Jeffrey S. Pigati, R. Scott Anderson, Kirk R. Johnson, Shannon A. Mahan, Thomas A. Ager, Richard G. Baker, Maarten Blaauw, Jordon Bright, Peter M. Brown, Bruce Bryant, Zachary T. Calamari, Paul E. Carrara, Michael D. Cherney, John R. Demboski, Scott A. Elias, Daniel C. Fisher, Harrison J. Gray, Danielle R. Haskett, Jeffrey S. Honke, Stephen T. Jackson, Gonzalo Jimenez-Moreno, Douglas Kline, Eric M. Leonard, Nathaniel A. Lifton, Carol Lucking, H. Gregory McDonald, Dane M. Miller, Daniel R. Muhs, Stephen E. Nash, Cody Newton, James B. Paces, Lesley Petrie, Mitchell A. Plummer, David F. Porinchu, Adam N. Rountrey, Eric Scott, Joseph J. W. Sertich, Saxon E. Sharpe, Gary L. Skipp, Laura E. Strickland, Richard K. Stucky, Robert S. Thompson, Jim Wilson
QUATERNARY RESEARCH
(2014)
Article
Geography, Physical
Ana Moreno, Anders Svensson, Stephen J. Brooks, Simon Connor, Stefan Engels, William Fletcher, Dominique Genty, Oliver Heiri, Inga Labuhn, Aurel Persoiu, Odile Peyron, Laura Sadori, Bias Valero-Garces, Sabine Wulf, Giovanni Zanchetta
QUATERNARY SCIENCE REVIEWS
(2014)
Letter
Geography, Physical
Scott A. Elias
QUATERNARY SCIENCE REVIEWS
(2014)
Editorial Material
Multidisciplinary Sciences
John F. Hoffecker, Scott A. Elias, Dennis H. O'Rourke
Article
Plant Sciences
Nancy H. Bigelow, Mary E. Edwards, Scott A. Elias, Thomas D. Hamilton, Charles E. Schweger
VEGETATION HISTORY AND ARCHAEOBOTANY
(2014)
Article
Archaeology
C. Robert Batchelor, Nicholas P. Branch, Enid A. Allison, Philip A. Austin, Barry Bishop, Alex D. Brown, Scott A. Elias, Christopher P. Green, Daniel S. Young
ENVIRONMENTAL ARCHAEOLOGY
(2014)
Article
Geography, Physical
Tianshu Zhang, Scott A. Elias
JOURNAL OF QUATERNARY SCIENCE
(2019)
Article
Geography, Physical
D. S. Young, C. P. Green, C. R. Batchelor, P. Austin, S. A. Elias, J. Athersuch, P. Lincoln
Summary: Wood macrofossil remains of alder and willow/poplar have been found in the sediment sequence in the valley of the Turker Beck in North Yorkshire, indicating their presence in the Late Glacial period in Britain. The palaeoenvironmental record suggests open environments dominated by herbaceous taxa, with stands of alder, birch, and willow woodland also present during this time.
JOURNAL OF QUATERNARY SCIENCE
(2021)
Review
Anthropology
John F. Hoffecker, Scott A. Elias, Dennis H. O'Rourke, G. Richard Scott, Nancy H. Bigelow
EVOLUTIONARY ANTHROPOLOGY
(2016)
Article
Geography, Physical
Huyue Song, Shixue Hu, Michael Benton, Dayong Jiang
Summary: This article examines the end Permian to Middle Triassic interval, which witnessed a significant marine mass extinction and delayed recovery. The focus is on Triassic marine sediments in South China, providing unique documentation of the collapse and recovery of marine ecosystems. Several papers analyze different fossils and their ecological significance, while others study biostratigraphy, reconstruct paleoenvironments, and link records to volcanic eruptions.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Mohammad Firoze Quamar, Upasana Swaroop Banerji, Biswajeet Thakur, Ratan Kar
Summary: The Indian Summer Monsoon is a crucial component of the Asian Monsoon System, impacting rainfall, agricultural productivity, and socio-economic growth in India and nearby regions. The central monsoon zone in India is more responsive to strong monsoon phases than weak ones.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Maria Laura Balestrieri, Valerio Olivetti, David Chew, Luca Zurli, Massimiliano Zattin, Foteini Drakou, Gianluca Cornamusini, Matteo Perotti
Summary: This study presents a multidisciplinary provenance study on legacy cores drilled in the central Ross Sea, Antarctica, providing insights into the oscillation of ice flows and advance and retreat phases of the West Antarctic Ice Sheet.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
P. Depuydt, S. Toucanne, C. Barras, S. Le Houedec, M. Mojtahid
Summary: This study provides a comprehensive overview of the dynamics of the upper branch of the Atlantic Meridional Overturning Circulation (AMOC) in the mid-latitudes of the Northeast Atlantic. It focuses on the European Slope Current (ESC) and its glacial equivalent known as the Glacial Eastern Boundary Current (GEBC). The study reveals significant changes in flow strength and ventilation during the glacial and deglaciation periods, as well as a gradual weakening of the slope current during the Holocene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Junhee Park, Holly J. Stein, Judith L. Hannah, Svetoslav V. Georgiev, Oyvind Hammer, Snorre Olaussen
Summary: This study reports new Re-Os ages for black shales from Svalbard and evaluates the paleoenvironment during organic-rich shale deposition. The study also proposes correlations of specific Late Jurassic ammonite zones between the Boreal and Tethyan realms.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Guocheng Dong, Weijian Zhou, Feng Xian, Yunchong Fu, Li Zhang, Ling Tang, Pengkai Ding
Summary: The cause of ice-age cycles is still not fully understood, and studying the timing and magnitude of mountain glaciations can provide valuable insights. This study presents new dating results from the Niqingqu Valley in the Tibetan Plateau, showing multiple glacial activities prior to the Penultimate Glacial Maximum. The findings suggest that low atmospheric CO2 content and reduced summer solar insolation/high summer-monsoon precipitation played a role in these glacial fluctuations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Haoran Dong, Zhitong Chen, Yucheng Wang, Jie Chen, Zhiping Zhang, Zhongwei Shen, Xinwei Yan, Jianbao Liu
Summary: Through sediment records from Lake Nanyi in the lower Yangtze, we found that anthropogenic fire activity played a dominant role in the region, and the temporal pattern of fire activity was asynchronous from east to west. Archaeological evidence suggests an inverse relationship between agricultural and population levels and fire intensity during the mid-Holocene, with fire intensity being influenced by the diversity of landscape types associated with pre-historic subsistence patterns. Overall, changes in regional water-level delayed the transition from hunting-gathering to agriculture in the lower Yangtze region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Giovanni Coletti, Giulia Bosio, Alberto Collareta, Or Mordecai Bialik, Eleonora Regattieri, Irene Cornacchia, Gianni Insacco, John Buckeridge
Summary: This paper argues that sessile barnacles are an excellent proxy for palaeoenvironmental reconstructions. The shells of barnacles consist of diagenetically stable low-magnesium calcite and record short-term variations. Analyses of several Western Mediterranean barnacle-rich deposits demonstrate the utility of barnacles as proxies for water depth, distance from the coastline, and hydrodynamic conditions. Moreover, the stable isotope ratios of barnacle shells can provide detailed palaeoenvironmental information.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Feng Wu, Xinong Xie, Wen Yan, Youhua Zhu, Beichen Chen, Jianuo Chen, Mo Zhou
Summary: This paper describes the Quaternary evolution of Meiji Atoll in the southern South China Sea. The findings show how variations in sea surface temperature, eustatic sea level, and tectonics have influenced the development of the atoll. These findings have broader implications for understanding the Quaternary evolution of similar tropical carbonate atolls in the region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Ana Mateos, Ericson Hoelzchen, Jesus Rodriguez
Summary: The Epivillafranchian and the transition to the Galerian was a period of environmental fluctuations and faunal turnover. Hominins and giant hyenas could coexist during the Epivillafranchian, but the transition to the Galerian led to a disruption of the scavenging niche, coinciding with the extinction of P. brevirostris.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Tianyu Du, Wensheng Zhang, Bing Li, Linjing Liu, Yuecong Li, Yawen Ge, Shiyong Yu
Summary: This article presents sedimentary evidence for a dramatic channel displacement of the lower Yellow River about 3000-2600 years ago, and explains the impact of this displacement on the geomorphology and human migration.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Johann Mueller, Michael M. Joachimski, Oliver Lehnert, Peep Mannik, Yadong Sun
Summary: The Late Ordovician mass extinction occurred during an ice age, with maximum ice coverage and a substantial drop in global sea level. This led to the exposure or shallowing of shallow tropical shelf environments. The study suggests that the burial rate of nutrient phosphorus (P) on shelves was minimal during this glacial period, leading to excess bioavailable P entering the open ocean and stimulating phytoplankton production, which in turn lowered oxygen concentrations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Marina Addante, Patrizia Maiorano, Giovanna Scopelliti, Angela Girone, Maria Marino, Samanta Trotta, Antonio Caruso
Summary: This study presents the first high-resolution results on planktonic foraminiferal stable oxygen isotopes and calcareous plankton assemblages, providing insights into the glacial-interglacial variability and North Atlantic climate variability. The research also reveals evidence of the first significant southward migration of the Subarctic Front in the mid-latitudes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Bing-Cai Liu, Rui-Wen Zong, Kai Wang, Jiao Bai, Yi Wang, Hong-He Xu
Summary: Phytogeography plays a vital role in the evolution of plants. This paper describes a new species of a spore-bearing plant from the upper Silurian period in West Junggar, China. By analyzing global Silurian macrofossil records, the study reveals the spatial-temporal distribution of Silurian plant macrofossils and identifies two phytogeographic realms during the Pridoli Epoch.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Francois Fournier, Thomas Teillet, Alexis Licht, Jean Borgomano, Lucien Montaggioni
Summary: This study investigates the temporal evolution of neritic carbonates in the proto-South China Sea to reconstruct East Asian monsoonal currents and winds during the middle to late Paleogene. The results highlight that many of the features of the summer East Asian Monsoon large-scale circulation are rooted in the middle Paleogene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)