Article
Geography, Physical
Joseph E. Thomas, Darrell S. Kaufman, Nore Praet, Nicholas P. McKay, Maarten Van Daele, Britta J. L. Jensen, Marc De Batist
Summary: This study investigates the relationship between Holocene glacier fluctuations and hydroclimate changes in south-central Alaska, using sediment cores from Skilak Lake and Eklutna Lake. The research suggests that regional climate change is the overriding control of glacier fluctuations, with glacier expansion during the Little Ice Age correlating with increased sediment accumulation rate.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geology
Nore Praet, Maarten Van Daele, Jasper Moernaut, Thomas Mestdagh, Thomas Vandorpe, Britta J. L. Jensen, Robert C. Witter, Peter J. Haeussler, Marc De Batist
Summary: Seismic hazards in subduction settings typically arise from megathrust, intraslab and crustal earthquake sources. This study investigates the sedimentary record of Skilak Lake in Alaska to evaluate whether different seismic sources leave a distinct imprint and demonstrates the potential of the lake's sedimentary record for comprehensive seismic hazard analysis in south-central Alaska.
Article
Geosciences, Multidisciplinary
Xingxing Wang, Feng Cai, Zhilei Sun, Qing Li, Ang Li, Yunbao Sun, Weijie Zhong, Qiliang Sun
Summary: This study examines the late Miocene-Quaternary deep-water stratigraphy, sedimentary evolution, and responses to regional tectonic and climatic variations at the northeastern margin of the South China Sea. It concludes that the deep-water stratigraphy records tectonic collision and mid-Pleistocene climate transition, providing important insights into the relationships among tectonic, paleoclimatic, paleoceanographic, and deep-water sedimentary processes in the western Pacific Ocean.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geography, Physical
Luigi Ferranti, Pierfrancesco Burrato, Daniele Sechi, Stefano Andreucci, Fabrizio Pepe, Vincenzo Pascucci
Summary: Mapping and luminescence aging of raised marine terraces and aeolian ridges along a 90 km coastal stretch in southwestern Sicily provide the first quantitative assessment of vertical tectonic deformation in this region. The results demonstrate that the uplift includes a regional component related to the involvement of thicker crustal portions of the northern African continental margin in the thrust belt, and a local component corresponding to actively growing bedrock folds.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geography, Physical
Peter J. Haeussler, Ari Matmon, Maurice Arnold, Georges Aumaitre, Didier Bourles, Karim Keddadouche
Summary: This study focused on the timing of deglaciation of the northernmost marine-terminating glaciers of the Cordilleran Ice Sheet. The results suggest that the ice began retreating from the northwestern Prince William Sound around 14.3 ka and the retreat rate slowed as the glaciers moved further into northern PWS.
QUATERNARY RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Sarah K. Schultz, James A. MacEachern, Octavian Catuneanu, Shahin E. Dashtgard, Nakari Diaz
Summary: This study presents a high-resolution sequence stratigraphic framework for the Viking Formation, a stratigraphically complex unit in the Western Canada Sedimentary Basin. By mapping and describing the formation using a depositional sequence IV nomenclature, the study identifies four systems tracts and discusses the architecture of deposits in each sequence. Additionally, the study identifies four additional stratigraphic plays that have been overlooked in previous exploration efforts. This high-resolution framework provides valuable insights for future petroleum exploration in the basin.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Chunqing Sun, Luo Wang, Gill Plunkett, Enlou Zhang, Jiaqi Liu
Summary: This study reports key and widespread late Pleistocene to Holocene tephras from a lake sequence in southern China, providing important potential for dating and synchronizing paleoenvironmental records in East Asia. The extensively distributed tephras enable correlations between tropical Philippines, mainland China, and midlatitude Japan, facilitating future climate studies in the region. The findings highlight volcanic hazards in densely populated East Asia and offer solutions for dating uncertainty in synchronizing rapid climate events.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
B. M. Keough, K. D. Ridgway
Summary: The analysis of upper Paleozoic-Jurassic strata in the central Alaska Range sheds new light on the Late Triassic-Jurassic depocenters, the late Paleozoic paleogeographic position of the Farewell terrane, and the timing of its accretion to the Laurentian margin. The Southern package consists of Permian-Middle Triassic and Upper Triassic strata correlated with the Farewell terrane, while the Northern package comprises Upper Triassic-Jurassic strata along the northwestern margin of Laurentia. Both packages provide important insights into the geological history of the region.
Article
Geography, Physical
Tabito Matsu'ura, Minoru Ikehara, Tatsuyuki Ueno
Summary: Researchers investigated the deep-sea sedimentary sequence of a core from off Shikoku Island in the NW Pacific Ocean, refining tephrostratigraphy by detecting and correlating numerous tephras and cryptotephras. Results were crosschecked against marine tephrostratigraphy, revealing the importance of linking tephras between terrestrial and marine sequences to assess synchronicity of globally correlated age indicators.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Ajab Singh, Ashok K. Srivastava, Naveen Chauhan
Summary: The study uses YTT ash as a tool to interpret the age connotation of geological events through luminescence dating, focusing on the depositional age and bracketing time of the ash in Quaternary sediments of India.
JOURNAL OF EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Mariajose Herrera-Ossandon, Gabriel Easton, Jose Luis Antinao, Steven L. Forman
Summary: The Andean mountain glaciers in central Chile are influenced by the mid-latitude westerlies and subtropical semiarid conditions. The glacial dynamics during the late Pleistocene-early Holocene period were mainly driven by precipitation and paleoclimate conditions, with multiple advances and retreats identified.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Jeremy M. Rimando, Lindsay M. Schoenbohm, Gustavo Ortiz, Patricia Alvarado, Agostina Venerdini, Lewis A. Owen, Erin G. Seagren, Paula Marques Figueiredo, Sarah Hammer
Summary: This study investigates the seismic history of the Sierras Pampeanas region in Argentina, measuring slip rates on the Las Chacras Fault Zone (LCFZ) using geological and geomorphic measurements, as well as Be-10 dating. The results show that while the uplift rate on the LCFZ is similar to other faults in the region, the shortening rate is lower, consistent with the west-to-east decrease in shortening rates inferred from GPS data.
Article
Geosciences, Multidisciplinary
T. Kukla, M. J. Winnick, M. M. Lague, Z. Xia
Summary: Speleothem oxygen isotope records reveal a zonal South American Precipitation Dipole (SAPD) in the late Quaternary, with opposing precipitation anomalies in the east and west. However, the SAPD remains enigmatic due to differences in isotopic records and inaccuracies in climate models. This study addresses the enigma by accounting for upwind rainout effects and proposing a new framework that suggests a migrating precipitation centroid.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Geography, Physical
Qiangqiang Kou, Liping Zhu, Junbo Wang, Qingfeng Ma, Jianting Ju
Summary: This study reconstructed the lake-level history of Serling Co in central Tibet using geochemical proxies derived from sediments. The results show that Serling Co experienced low lake levels during the Last Glacial Maximum, fluctuating levels during the last deglaciation, and relatively high levels in the Holocene, corresponding to climatic events. The study highlights the role of long-term precipitation-evaporation balance and climate events in lake-level variation.
GLOBAL AND PLANETARY CHANGE
(2023)
Article
Geography, Physical
Rebecca Taormina, Lee Nordt, Mark Bateman
Summary: This study examines the alluvial terrace and floodplain deposits of the Brazos River system in central Texas through geomorphic assessment, sediment core analysis, and luminescence dating (OSL). It reveals the complex interplay between bedrock and climate on episodes of channel incision and aggradation in the late Quaternary history of the river system.
QUATERNARY INTERNATIONAL
(2022)
Article
Biodiversity Conservation
Konstantina Agiadi, Michele Azzarone, Quan Hua, Darrell S. Kaufman, Danae Thivaiou, Paolo G. Albano
Summary: The study tested the taphonomic clock hypothesis on marine demersal and pelagic fish otoliths from the Israeli shelf, revealing significant variations in otolith ages along the depth gradient. While severely altered otoliths tended to be older, pelagic fish otoliths at 30 m depth showed a positive correlation between taphonomic degradation and postmortem age.
Article
Geography, Physical
Ellie Broadman, Darrell S. Kaufman, R. Scott Anderson, Sonya Bogle, Matthew Ford, David Fortin, Andrew C. G. Henderson, Jack H. Lacey, Melanie J. Leng, Nicholas P. McKay, Samuel E. Munoz
Summary: This study investigates the postglacial history of the Kenai Peninsula in Alaska, focusing on the deglaciation, vegetation development, and past hydroclimate of the region. By analyzing proxy datasets from Hidden and Kelly lakes, the researchers were able to understand the retreat of glacier ice, the importance of groundwater in lake hydrology, and the influence of climate change on lake water isotopes. The findings highlight the usefulness of mass balance modeling and the potential confounding effects of groundwater on interpreting paleolimnologic oxygen isotope data.
QUATERNARY RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Edward E. Berg, Darrell S. Kaufman, R. Scott Anderson, Gregory C. Wiles, Thomas V. Lowell, Edward A. D. Mitchell, Feng Sheng Hu, Alan Werner
Summary: Recent decades of warming climate in southern Alaska have led to drying wetlands and falling lake levels. This study examines the historical fluctuations in lake levels, including high and low stands, and the impact of these changes on vegetation succession. The research also highlights how data from peat records in satellite fens can be used to reconstruct paleo-lake levels.
Article
Forestry
Raphael Neukom, Nathan Steiger, Darrell Kaufman, Martin Grosjean
Summary: Buntgen et al. present a new reconstruction of extra-tropical summer temperatures based on updated versions of a large number of tree-ring width chronologies. The comparison between their reconstruction and the PAGES 2k reconstructions is flawed due to the different reconstruction targets. The study highlights the importance of careful interpretation and reliable assessment of scientific results.
Article
Geography, Physical
Teena Chauhan, Hans Petter Sejrup, Berit Oline Hjelstuen, Darrell S. Kaufman, Irfan Baig, Benedict T. I. Reinardy
Summary: This study contributes to the chronology of Early to Mid-Pleistocene sediments in the North Sea through the use of amino acid racemization and strontium isotope analyses. The combined use of these methods helps to refine the chronology of North Sea sediments, particularly those related to glacial processes.
QUATERNARY GEOCHRONOLOGY
(2022)
Article
Geography, Physical
Emily Millman, Lucy Wheeler, Katharina Billups, Darrell Kaufman, Kirsty E. H. Penkman
Summary: The study assessed the impact of two oxidative pre-treatments on amino acid concentration and D/L values in benthic and planktic foraminifers, finding that hydrogen peroxide pre-treatment is sufficient for AAR applications in foraminifera.
QUATERNARY GEOCHRONOLOGY
(2022)
Article
Fisheries
Derek W. Chamberlin, Virginia R. Shervette, Darrell S. Kaufman, Jordon E. Bright, William F. Patterson III
Summary: We investigated the relationship between aspartic acid D:l ratios and otolith-derived age estimates in Gulf of Mexico red snapper and Caribbean yellowtail snapper. The results suggest that amino acid racemization may be an effective tool for direct age estimation and age validation in fishes.
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2023)
Article
Ecology
Paolo G. Albano, Anna Sabbatini, Jonathan Lattanzio, Jan-Filip Paessler, Jan Steger, Quan Hu, Darrell S. Kaufman, Sonke Szidat, Martin Zuschin, Alessandra Negri
Summary: Human activities have greatly influenced biogeographical patterns by introducing non-indigenous species into new areas. However, the lack of long-term observational data makes it difficult to fully understand invasion histories. This study used sediment cores from the southern Israeli shelf to uncover the past of the Lessepsian invasion, which involves the entrance of tropical species into the Mediterranean through the Suez Canal. By applying radiocarbon dating techniques, the researchers found evidence suggesting that some species previously considered non-indigenous are actually native to the Mediterranean. This study highlights the importance of considering long-term historical records to accurately determine the origin and status of species invasions.
MARINE ECOLOGY PROGRESS SERIES
(2022)
Article
Geography, Physical
Lorna Louise Thurston, Erik Schiefer, Nicholas P. McKay, Darrell S. Kaufman
Summary: Lake-based studies provide valuable records of sediment yield over different time scales, which can enhance our understanding of sediment transfer in catchments and complement fluvial-based studies. This particular study used fallout radionuclides and sediment density patterns to estimate sediment accumulation rates in Lake Peters, Alaska, and compared the results with fluvial-based sediment delivery.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Geography, Physical
Emmy A. A. Wrobleski, Ellie Broadman, A. L. Werner, Donald T. T. Rodbell, Darrell S. S. Kaufman
Summary: Major shifts in hydroclimate have been observed in south-central Alaska during the last deglacial period and the Holocene. Rare freshwater calcium carbonate deposits in lakes on the Kenai Peninsula can be used to reconstruct past hydroclimate changes, including the influence of groundwater inflow. The sediment sequence from groundwater-fed Kelly Lake was analyzed, revealing changes in isotopes and proxies that indicate shifts in hydroclimate and the influence of meteoric water and groundwater on the lake's sedimentation.
JOURNAL OF QUATERNARY SCIENCE
(2023)
Review
Multidisciplinary Sciences
Darrell S. Kaufman, Ellie Broadman
Summary: This review examines evidence from indicators and drivers of global change to evaluate whether anthropogenic global warming was preceded by a long-term warming trend or by global cooling. It finds that multimillennial-scale cooling before industrialization requires extra climate forcing and major climate feedbacks, while global warming challenges proxy-based reconstructions of past climate. The resolution of this conundrum has implications for understanding climate sensitivity and advancing our understanding of slow-moving climate variability.
Article
Geology
Matias Do Nascimento Ritter, Fernando Erthal, Matthew A. Kosnik, Michal Kowalewski, Joao Carlos Coimbra, Felipe Caron, Darrell S. Kaufman
Summary: Surficial shell accumulations from shallow marine settings are typically dominated by recent specimens and exhibit strongly right-skewed age-frequency distributions. This study examines age-frequency distributions from offshore settings in southern Brazil and finds that deeper water environments have slightly longer time averaging and symmetrical to left-skewed distributions dominated by specimens from the Last Glacial Maximum. The observed changes in age-frequency distributions along the onshore-offshore gradient likely reflect sea-level changes and corresponding variations in biological productivity.
Article
Geosciences, Multidisciplinary
Christopher L. Hancock, Nicholas P. McKay, Michael P. Erb, Darrell S. Kaufman, Cody R. Routson, Ruza F. Ivanovic, Lauren J. Gregoire, Paul Valdes
Summary: Substantial changes in terrestrial hydroclimate during the Holocene are recorded in geological archives and simulated by computer models. Proxy records and model simulations indicate wetter-than-modern conditions during the early and mid-Holocene in Northern Hemisphere monsoon regions, while Southern Hemisphere monsoon regions were drier. The pattern of change is less certain in the midlatitudes, with proxy composites showing a wetting trend and simulations indicating relatively low magnitude of change.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Environmental Sciences
Leah P. Marshall, Darrell S. Kaufman, R. Scott Anderson, Nicholas P. McKay, Edward A. G. Schuur
Summary: This study investigates the accumulation and degradation of organic matter in permafrost over the Holocene. The results show that the preservation of organic matter in upland areas is influenced by hillslope geomorphic processes, cryoturbation, and climatic variations. The findings provide insights into the carbon dynamics in permafrost environments and their potential feedback on climate change.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Darrell S. Kaufman, Nicholas P. McKay
Summary: The 2013 report concluded that Northern Hemisphere temperatures reached the highest levels in at least 1400 years, while the 2021 report finds that global mean temperatures are rising to levels unprecedented in over 100,000 years. The new assessment incorporates additional global warming data between the two reports and improved paleotemperature reconstructions that extend further back in time. In addition to past and recent warming, the conclusion also considers multi-century future warming, allowing for a direct comparison with paleotemperature reconstructions on multi-century time scales.
CLIMATE OF THE PAST
(2022)