Caleb K. Walcott
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View article: East Greenland Ice Sheet retreat history from Scoresby Sund and Storstrømmen Glacier during the last deglaciation
East Greenland Ice Sheet retreat history from Scoresby Sund and Storstrømmen Glacier during the last deglaciation Open
The lack of geological constraints on past ice-sheet change in marine-based sectors of the Greenland Ice Sheet (GrIS) following the Last Glacial Maximum limits our ability to assess (1) the drivers of ice-sheet change, and (2) the performa…
View article: East Greenland Ice Sheet retreat history during the last deglaciation
East Greenland Ice Sheet retreat history during the last deglaciation Open
The lack of geological constraints on past ice-sheet change in marine-based sectors of the Greenland Ice Sheet (GrIS) following the Last Glacial Maximum limits our ability to assess (1) the drivers of ice-sheet change, and (2) the performa…
View article: Glacial erosion and history of Inglefield Land, northwestern Greenland
Glacial erosion and history of Inglefield Land, northwestern Greenland Open
We used mapping of bedrock lithology, bedrock fractures, and lake density in Inglefield Land, northwestern Greenland, combined with cosmogenic nuclide (10Be and 26Al) measurements in bedrock surfaces, to investigate glacial erosion and the…
View article: Holocene deglaciation of Prudhoe Dome, northwest Greenland
Holocene deglaciation of Prudhoe Dome, northwest Greenland Open
Projections of future sea-level rise benefit from understanding the response of past ice sheets to interglacial warmth. Constraints on the extent of inland Greenland Ice Sheet (GrIS) recession during the Middle Holocene (~8 – 4 ka) are lim…
View article: Glacial erosion and history of Inglefield Land, northwest Greenland
Glacial erosion and history of Inglefield Land, northwest Greenland Open
We used mapping of bedrock lithology, bedrock fractures, and lake density in Inglefield Land, northwest Greenland, combined with cosmogenic nuclide (10Be and 26Al) measurements in bedrock surfaces, to investigate glacial erosion and the ic…
View article: An ice-sheet modelling framework for leveraging sub-ice drilling to assess sea level potential applied to Greenland
An ice-sheet modelling framework for leveraging sub-ice drilling to assess sea level potential applied to Greenland Open
The contribution of the Greenland Ice Sheet (GIS) to sea level rise (SLR) is accelerating and there is an urgent need to improve predictions of when and from what parts of the ice sheet Greenland will contribute its first meter. Estimating…
View article: New age constraints reveal moraine stabilization thousands of years after deposition during the last deglaciation of western New York, USA
New age constraints reveal moraine stabilization thousands of years after deposition during the last deglaciation of western New York, USA Open
The timing of the last deglaciation of the Laurentide Ice Sheet in western New York is poorly constrained. The lack of direct chronology in the region has led to a hypothesis that the Laurentide Ice Sheet re-advanced to near its Last Glaci…
View article: Comment on egusphere-2023-2655
Comment on egusphere-2023-2655 Open
Abstract. The timing of the last deglaciation of the Laurentide Ice Sheet in western New York is poorly constrained. The lack of direct chronology in the region has led to a provocative hypothesis that the Laurentide Ice Sheet re-advanced …
Polar Impact's Guide to Inclusive Fieldwork Experiences Open
Fieldwork is a key element in natural sciences, including polar sciences, yet there is a notable lack of representation of minorities in polar field expeditions. Despite the historical involvement of ethnic minorities in such expeditions, …
View article: Comment on egusphere-2023-2655
Comment on egusphere-2023-2655 Open
Abstract. The timing of the last deglaciation of the Laurentide Ice Sheet in western New York is poorly constrained. The lack of direct chronology in the region has led to a provocative hypothesis that the Laurentide Ice Sheet re-advanced …
View article: New age constraints reveal moraine stabilization thousands of years after deposition during the last deglaciation of western New York, USA
New age constraints reveal moraine stabilization thousands of years after deposition during the last deglaciation of western New York, USA Open
The timing of the last deglaciation of the Laurentide Ice Sheet in western New York is poorly constrained. The lack of direct chronology in the region has led to a provocative hypothesis that the Laurentide Ice Sheet re-advanced to near it…
Equilibrium line altitudes of alpine glaciers in Alaska suggest Last Glacial Maximum summer temperature was 2–5 °C lower than during the pre-industrial Open
The lack of continental ice sheets in Alaska during the Last Glacial Maximum (LGM; 26–19 ka) has long been attributed to extensive aridity in the western Arctic. More recently, climate model outputs, a few isolated paleoclimate studies, an…
Comment on cp-2023-20 - response to Dr. Reyes Open
Abstract. The lack of continental ice sheets in Alaska during the Last Glacial Maximum (LGM; 26–19 ka) has long been attributed to arid and relatively warm summer conditions. Records of this aridity across Alaska are relatively abundant, y…
Reply on RC1 Open
Abstract. The lack of continental ice sheets in Alaska during the Last Glacial Maximum (LGM; 26–19 ka) has long been attributed to arid and relatively warm summer conditions. Records of this aridity across Alaska are relatively abundant, y…
Comment on cp-2023-20 Open
Abstract. The lack of continental ice sheets in Alaska during the Last Glacial Maximum (LGM; 26–19 ka) has long been attributed to arid and relatively warm summer conditions. Records of this aridity across Alaska are relatively abundant, y…
Comment on cp-2023-20 Open
Abstract. The lack of continental ice sheets in Alaska during the Last Glacial Maximum (LGM; 26–19 ka) has long been attributed to arid and relatively warm summer conditions. Records of this aridity across Alaska are relatively abundant, y…
Equilibrium line altitudes of alpine glaciers suggest summers in Alaska were not more than −2 – −5 °C colder than the pre-Industrial during the Last Glacial Maximum Open
The lack of continental ice sheets in Alaska during the Last Glacial Maximum (LGM; 26–19 ka) has long been attributed to arid and relatively warm summer conditions. Records of this aridity across Alaska are relatively abundant, yet quantit…
View article: Drill-site selection for cosmogenic-nuclide exposure dating of the bed of the Greenland Ice Sheet
Drill-site selection for cosmogenic-nuclide exposure dating of the bed of the Greenland Ice Sheet Open
Direct observations of the size of the Greenland Ice Sheet during Quaternary interglaciations are sparse yet valuable for testing numerical models of ice-sheet history and sea level contribution. Recent measurements of cosmogenic nuclides …
View article: Where to GreenDrill? Site selection for cosmogenic nuclide exposure dating of the bed of the Greenland Ice Sheet
Where to GreenDrill? Site selection for cosmogenic nuclide exposure dating of the bed of the Greenland Ice Sheet Open
Direct observations of the size of the Greenland Ice Sheet during Quaternary interglaciations are sparse yet valuable for testing numerical models of ice sheet history and sea level contribution. Recent measurements of cosmogenic nuclides …
Cosmogenic ages indicate no MIS 2 refugia in the Alexander Archipelago, Alaska Open
The late-Pleistocene history of the coastal Cordilleran Ice Sheet remains relatively unstudied compared to chronologies of the Laurentide Ice Sheet. Yet accurate reconstructions of Cordilleran Ice Sheet extent and the timing of ice retreat…
View article: Greenland ice sheet vulnerability under diverse climatic warming scenarios
Greenland ice sheet vulnerability under diverse climatic warming scenarios Open
Sea-level rise of even one meter will have drastic global impacts. Melting the Greenland Ice Sheet (GIS) would raise sea level by 7.4 meters. There is an urgent need to improve predictions of how quickly the GIS will contribute its first m…
Reply on RC1 Open
Abstract. The late-Pleistocene history of the coastal Cordilleran Ice Sheet remains relatively unstudied compared to chronologies of the Laurentide Ice Sheet. Yet accurate reconstructions of Cordilleran Ice Sheet extent and the timing of i…
Reply on RC2 Open
Abstract. The late-Pleistocene history of the coastal Cordilleran Ice Sheet remains relatively unstudied compared to chronologies of the Laurentide Ice Sheet. Yet accurate reconstructions of Cordilleran Ice Sheet extent and the timing of i…
A cosmogenic nuclide chronology of Cordilleran Ice Sheet configuration during the Last Glacial Maximum in the northern Alexander Archipelago, Alaska Open
The late-Pleistocene history of the coastal Cordilleran Ice Sheet (CIS) remains relatively unstudied compared to chronologies of the Laurentide Ice Sheet. Yet accurate reconstructions of CIS extent and timing of ice retreat along the Pacif…
Supplementary material to "A cosmogenic nuclide chronology of Cordilleran Ice Sheet configuration during the Last Glacial Maximum in the northern Alexander Archipelago, Alaska" Open
Table S1.Major element chemistry for 36 Cl samples SAMPLE SiO2 % TiO2 % Al2O3 % Fe2O3 % MnO % MgO % CaO % Na2O % K2O % P2O5 % Cr2O3 % LOI a
A Top-to-Bottom Luminescence-Based Chronology for the Post-LGM Regression of a Great Basin Pluvial Lake Open
We applied luminescence dating to a suite of shorelines constructed by pluvial Lake Clover in northeastern Nevada, USA during the last glacial cycle. At its maximum extent, the lake covered 740 km2 with a mean depth of 16 m and a water vol…