Article
Geography, Physical
Emma Ownsworth, David Selby, Jeremy Lloyd, Paul Knutz, Sonke Szidat, John Andrews, Colm O'Cofaigh
Summary: A new study investigates the sediment core from central Baffin Bay to reconstruct the ice sheet history and sediment fluxes. Two dominant sediment/discharge sources, detrital carbonate and radio-genic felsic, are identified. The study also provides updated age constraints and further supports the theory of an ice shelf in northern Baffin Bay.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Rebecca Jackson, Thomas Frederichs, Hartmut Schulz, Michal Kucera
Summary: Baffin Bay Detrital Carbonate (BBDC) layers are sedimentary deposits found throughout Baffin Bay, representing periods of increased discharge of terrigenous sediments, icebergs, and freshwater. These events reflect repeated ice sheet instability periods and have similar statistical properties to Heinrich events but different timing. The link between Arctic and Laurentide Ice sheets instabilities remains unclear.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Review
Geography, Physical
Nicolas E. Young, Jason P. Briner, Gifford H. Miller, Alia J. Lesnek, Sarah E. Crump, Simon L. Pendleton, Roseanne Schwartz, Joerg M. Schaefer
Summary: Beryllium-10 has become a primary cosmogenic nuclide for quantifying Earth-surface processes. By measuring Be-10 at a precision level of <= 2-3%, researchers can now compare Be-10-based records of glacier and ice-sheet change to independent records of climate variability. The Be-10 measurements over the last 10+ years have provided a detailed picture of ice-margin migration through the early Holocene, showing interruptions in deglaciation by ice-margin readvances or stillstands.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geography, Physical
Quentin Duboc, Patrick Lajeunesse, Guillaume St-Onge, Matthias Moros, Kerstin Perner
Summary: Constraining the final retreat of the Laurentide Ice Sheet is important for understanding the impacts of glacial retreat on landscapes, sedimentary processes, oceanography, and climate variations in Eastern North America. This paper investigates the deglacial sedimentary sequences from Nachvak and Saglek Fjords in Northern Labrador, revealing thick deglacial sequences and important mass-movement deposits. The results suggest that earthquakes, sediment export, and Labrador Sea waters influenced the deglacial and postglacial sedimentary dynamics of the fjords.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Multidisciplinary Sciences
Federico Scoto, Henrik Sadatzki, Niccolo Maffezzoli, Carlo Barbante, Alessandro Gagliardi, Cristiano Varin, Paul Vallelonga, Vasileios Gkinis, Dorthe Dahl-Jensen, Helle Astrid Kjaer, Francois Burgay, Alfonso Saiz-Lopez, Ruediger Stein, Andrea Spolaor
Summary: The decline of sea ice in the North Atlantic and Nordic Seas during the last glacial period, known as Dansgaard-Oeschger (D-O) events, contributed to repeated abrupt atmospheric warmings recorded in Greenland ice cores. By analyzing records from the NEEM ice core and sediment cores, researchers discovered that the replacement of stable multiyear sea ice with seasonal sea ice amplified the abrupt climate warming during D-O events, highlighting the importance of feedbacks associated with seasonal sea ice expansion in driving the North Atlantic ocean-climate system.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geography, Physical
Jens Weiser, Juergen Titschack, Markus Kienast, Ian Nicholas McCave, Annalena Antonia Lochte, Jeetendra Saini, Ruediger Stein, Dierk Hebbeln
Summary: The hydrodynamics of the Labrador Sea play a crucial role for the Atlantic Meridional Overturning Circulation (AMOC) and understanding its past may hold the key to predicting its future behavior. New research shows that the Atlantic Water inflow into the Labrador Sea during the Holocene is closely linked to the North Atlantic Speed Maximum, indicating a close coupling with the AMOC. The lag between microfossil-based records and the Holocene Speed Maximum can be explained by the presence of a meltwater lens hindering the inflow of Atlantic waters in the early Holocene.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geography, Physical
Emmanuel Okuma, Johanna Hingst, Jens Weiser, Lina Madaj, Juergen Titschack, Christoph Vogt, Markus Kienast, Claude Hillaire-Marcel, Dierk Hebbeln, Simone A. Kasemann
Summary: Since the last deglaciation, Baffin Bay has transformed from an isolated marginal sea to a major Arctic-Atlantic throughflow connected to the North Atlantic circulation. The sediment core GeoB22336-4 from the mouth of Lancaster Sound provides new insights on the impacts of ice-sheet retreat and opening of the gateways to the Arctic Ocean on the depositional setting. Changes in sediment sources, depositional processes, and radiogenic isotope signatures reveal the history of ice-sheet recession, gateway openings, and sea ice-rafted sediment input in northern Baffin Bay.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Multidisciplinary Sciences
Lars Max, Dirk Nuernberg, Cristiano M. Chiessi, Marlene M. Lenz, Stefan Mulitza
Summary: This study provides solid evidence for the rapid subsurface ocean warming preceding Heinrich Events in the subpolar Atlantic. The accumulation of ocean heat near the critical depth is identified as the trigger for the melting of marine-terminating portions of the Laurentide Ice Sheet. The study also suggests that weaker ocean circulation in the future may lead to accelerated interior-ocean warming, which is critical for the stability of modern Arctic glaciers and the freshwater budget of the North Atlantic.
NATURE COMMUNICATIONS
(2022)
Article
Meteorology & Atmospheric Sciences
Xiaolan L. Wang, Merce Casas-Prat, Yang Feng, Alexander Crosby, Val R. Swail
Summary: This study presents and analyzes the historical changes in surface wind speed and ocean surface waves in the Davis Strait Baffin Bay region using Environment Canada's data from 1979 to 2016. The results show significant increases in wind speed and wave height in September-December, with decreases in June. Additionally, the trend intensifies in 2001-16 for both wind speed and wave height in September and December.
JOURNAL OF CLIMATE
(2021)
Article
Geography, Physical
Hugo Dube-Loubert, Martin Roy, Jean J. Veillette, Etienne Brouard, Joerg M. Schaefer, Hella Wittmann
Summary: The study systematically maps glacial landforms and ice-flow indicators in a large area of northeastern Quebec and Labrador, addressing uncertainties regarding ice divide evolution, landform systems, and ice retreat patterns. The application of cosmogenic dating provides new insights on the chronological framework and subglacial thermal regime, outlining four main landform assemblages and revealing a shift in deglaciation mode from warm-based to cold-based ice retreat. The research indicates that cold-based ice conditions were limited to highly elevated terrains, ruling out extensive cold-based ice cover over Ungava Bay during the last deglaciation.
Article
Environmental Sciences
Defang You, Ruediger Stein, Kirsten Fahl, Maricel C. Williams, Daniela N. Schmidt, Ian Nicholas McCave, Stephen Barker, Enno Schefuss, Lu Niu, Gerhard Kuhn, Frank Niessen
Summary: According to sediment core biomarker proxy records from the Eirik Drift, freshwater perturbations during the last deglaciation drove abrupt changes in sea surface temperature and sea ice extent. Four millennial-scale meltwater events have been identified between the last 14,000 and 8,200 years, characterized by increased sea ice formation and decreased sea surface temperatures. These events were likely triggered by meltwater pulsing into the Labrador Sea periodically, resulting from collapse of the Laurentide-Greenland Ice Sheets caused by (sub-)surface ocean warming.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geography, Physical
G. A. Goss, A. D. Rooney
Summary: The reconstruction of Pleistocene glacial cycles through oxygen isotope records reveals significant changes in global climate and ice sheet size. The Mid-Pleistocene Transition (MPT) marks a major shift in global ice sheet behavior from symmetrical 41-thousand-year cycles to asymmetrical 100-thousand-year cycles. The causes of this transition, including cryosphere dynamics and changes in Earth's energy balance, are still debated. The Regolith Hypothesis suggests that fluctuations in the stability of the Laurentide Ice Sheet (LIS) during the MPT were driven by changes in the lithology of its subglacial substrate. In this study, variations in seawater osmium isotope values are used to empirically investigate this hypothesis, revealing a lithological shift beneath the LIS during the MPT and a significant impact on chemical weathering fluxes to the ocean.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geography, Physical
Liming Ye, Xiaoguo Yu, Dong Xu, Weiguo Wang, Yeping Bian, Juan Xu, Linsen Dong, Rong Wang, Weiyan Zhang, Yanguang Liu, Lu Jin, Ying Yang
Summary: This study investigates the source, amount, and trajectory of icebergs in the western Arctic Ocean and their impact on Arctic ice sheet development and the Atlantic meridional overturning circulation (AMOC). The findings provide insights into the origins of icebergs in the North Atlantic Ocean and the mechanisms of AMOC instability, suggesting that the expansion of the East Siberian ice sheet may play a more significant role in triggering iceberg outbursts than the discharge of icebergs from the Laurentide ice sheet.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
J. H. England, R. D. Coulthard, M. F. A. Furze, C. F. Dow
Summary: This study documents the deposition and chronological record of a massive ice shelf from the former Laurentide Ice Sheet. The ice shelf advanced and retreated over a span of about 400 years, and its catastrophic breakup coincided with rapid warming of the atmosphere and ocean. The findings suggest that current ice dynamics models may underestimate the sensitivity of similar margins in Antarctica to ongoing global warming, emphasizing the importance of this research for estimating future sea level rise.
QUATERNARY SCIENCE REVIEWS
(2022)
Review
Geosciences, Multidisciplinary
Hong Wang, Weijian Zhou, Peixian Shu, Bing Hong, Zhisheng An
Summary: Research on North American and Asian climate during the Last Glacial Maximum reveals similar climate oscillations patterns, as well as a two-stage evolution of climate change, particularly in the distribution of Asian monsoons.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geography, Physical
Pedro J. Marenco, Katherine R. Martin, Katherine N. Marenco, Donald C. Barber
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2016)
Article
Environmental Sciences
James T. Morris, Donald C. Barber, John C. Callaway, Randy Chambers, Scott C. Hagen, Charles S. Hopkinson, Beverly J. Johnson, Patrick Megonigal, Scott C. Neubauer, Tiffany Troxler, Cathleen Wigand
Article
Geography, Physical
Andrew C. Kemp, Jessica J. Kegel, Stephen J. Culver, Donald C. Barber, David J. Mallinson, Eduardo Leorri, Christopher E. Bernhardt, Niamh Cahill, Stanley R. Riggs, Anna L. Woodson, Ryan P. Mulligan, Benjamin P. Horton
QUATERNARY SCIENCE REVIEWS
(2017)
Article
Environmental Sciences
Stephanie H. Nebel, Arthur C. Trembanis, Donald C. Barber
JOURNAL OF COASTAL RESEARCH
(2012)
Article
Environmental Sciences
Stephanie H. Nebel, Arthur C. Trembanis, Donald C. Barber
JOURNAL OF COASTAL RESEARCH
(2013)
Article
Geography, Physical
H. Rashid, F. Saint-Ange, D. C. Barber, M. E. Smith, N. Devalia
QUATERNARY SCIENCE REVIEWS
(2012)
Article
Geography, Physical
Bianca Reo Charbonneau, Stephanie M. Dohner, John P. Wnek, Don Barber, Phoebe Zarnetske, Brenda B. Casper
Summary: In this study, wind tunnel experiments were conducted to test how the morphology, density, and configuration of three foredune pioneer plant species influence dune initiation. Results showed that plant morphology, density, and configuration all impacted the resulting topography of dunes.
Article
Multidisciplinary Sciences
Jennifer S. Walker, Robert E. Kopp, Timothy A. Shaw, Niamh Cahill, Nicole S. Khan, Donald C. Barber, Erica L. Ashe, Matthew J. Brain, Jennifer L. Clear, D. Reide Corbett, Benjamin P. Horton
Summary: The study estimated sea-level budgets along the U.S. Atlantic coast, finding a faster rate of rise during the 20th century than any time in the past 2000 years.
NATURE COMMUNICATIONS
(2021)
Article
Geography, Physical
Jennifer S. Walker, Tanghua Li, Timothy A. Shaw, Niamh Cahill, Donald C. Barber, Matthew J. Brain, Robert E. Kopp, Adam D. Switzer, Benjamin P. Horton
Summary: Stratigraphic data from salt marshes accurately reconstruct Holocene relative sea-level change and provide necessary constraints to glacial isostatic adjustment models. A new record of Mid- to Late-Holocene sea-level rise is presented using basal peats from a salt marsh in New Jersey. The sea-level index points range from 1211 to 4414 years BP, and the average rate of sea-level rise from 5000 years BP to present is 1.7 +/- 0.1 mm/year. Comparisons with GIA models show the models tend to overestimate sea-level rise in the past 5000 years.
Article
Geosciences, Multidisciplinary
Jennifer S. Walker, Niamh Cahill, Nicole S. Khan, Timothy A. Shaw, Don Barber, Kenneth G. Miller, Robert E. Kopp, Benjamin P. Horton
Article
Archaeology
Peter Magee, Hans-Peter Uerpmann, Margarethe Uerpmann, Sabah Abboud Jasim, Marc Haendel, Don Barber, Crystal Fritz, Emily Hammer
ARABIAN ARCHAEOLOGY AND EPIGRAPHY
(2009)
Article
Archaeology
P Magee, D Barber, M Sobur, S Jasim
ARABIAN ARCHAEOLOGY AND EPIGRAPHY
(2005)
Article
Geosciences, Multidisciplinary
JT Kelley, DC Barber, DF Belknap, DM FitzGerald, S van Heteren, SM Dickson
Article
Environmental Sciences
JT Kelley, SM Dickson, DF Belknap, WA Barnhardt, DC Barber
JOURNAL OF COASTAL RESEARCH
(2003)
