Articles | Volume 19, issue 11
https://doi.org/10.5194/cp-19-2341-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-19-2341-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Moss kill dates and modeled summer temperature track episodic snowline lowering and ice cap expansion in Arctic Canada through the Common Era
Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80303, USA
Department of Geological Sciences, University of Colorado Boulder, Boulder, CO 80303, USA
Simon L. Pendleton
Environmental Science and Policy Program, Plymouth State University, Plymouth, NH 03264, USA
Alexandra Jahn
Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80303, USA
Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO 80303, USA
Yafang Zhong
Space Science & Engineering Center, University of Wisconsin-Madison, Madison, WI 53706, USA
John T. Andrews
Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80303, USA
Scott J. Lehman
Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80303, USA
Jason P. Briner
Department of Geology, University at Buffalo, Buffalo, NY, USA
Jonathan H. Raberg
Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80303, USA
Department of Geological Sciences, University of Colorado Boulder, Boulder, CO 80303, USA
Helga Bueltmann
Institute of Biology and Biotechnology of Plants, University of Münster, Münster, Germany
Martha Raynolds
Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
Áslaug Geirsdóttir
Institute of Earth Sciences and Department of Earth Sciences, University of Iceland, Reykjavik 101, Iceland
John R. Southon
W.M. Keck Carbon Cycle AMS Laboratory, University of California at Irvine, Irvine, CA 92697, USA
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David J. Harning, Christopher R. Florian, Áslaug Geirsdóttir, Thor Thordarson, Gifford H. Miller, Yarrow Axford, and Sædís Ólafsdóttir
Clim. Past, 21, 795–815, https://doi.org/10.5194/cp-21-795-2025, https://doi.org/10.5194/cp-21-795-2025, 2025
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Questions remain about the past climate in Iceland, including the relative impacts of natural and human factors on vegetation change and soil erosion. We present a sub-centennial-scale record of landscape and algal productivity from a lake in north Iceland. Along with a high-resolution tephra age constraint that covers the last ∼ 12 000 years, our record provides an environmental template for the region and novel insight into the sensitivity of the Icelandic ecosystem to natural and human impacts.
David J. Harning, Jonathan H. Raberg, Jamie M. McFarlin, Yarrow Axford, Christopher R. Florian, Kristín B. Ólafsdóttir, Sebastian Kopf, Julio Sepúlveda, Gifford H. Miller, and Áslaug Geirsdóttir
Hydrol. Earth Syst. Sci., 28, 4275–4293, https://doi.org/10.5194/hess-28-4275-2024, https://doi.org/10.5194/hess-28-4275-2024, 2024
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As human-induced global warming progresses, changes to Arctic precipitation are expected, but predictions are limited by an incomplete understanding of past changes in the hydrological system. Here, we measured water isotopes, a common tool to reconstruct past precipitation, from lakes, streams, and soils across Iceland. These data will allow robust reconstruction of past precipitation changes in Iceland in future studies.
Nicolò Ardenghi, David J. Harning, Jonathan H. Raberg, Brooke R. Holman, Thorvaldur Thordarson, Áslaug Geirsdóttir, Gifford H. Miller, and Julio Sepúlveda
Clim. Past, 20, 1087–1123, https://doi.org/10.5194/cp-20-1087-2024, https://doi.org/10.5194/cp-20-1087-2024, 2024
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Analysing a sediment record from Stóra Viðarvatn (NE Iceland), we reveal how natural factors and human activities influenced environmental changes (erosion, wildfires) over the last 11 000 years. We found increased fire activity around 3000 and 1500 years ago, predating human settlement, likely driven by natural factors like precipitation shifts. Declining summer temperatures increased erosion vulnerability, exacerbated by farming and animal husbandry, which in turn may have reduced wildfires.
David Harning, Thor Thordarson, Áslaug Geirsdóttir, Gifford Miller, and Christopher Florian
Geochronology Discuss., https://doi.org/10.5194/gchron-2022-26, https://doi.org/10.5194/gchron-2022-26, 2022
Preprint withdrawn
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Volcanic ash layers are a common tool to synchronize records of past climate, and their estimated age relies on external dating methods. Here, we show that the chemical composition of the well-known, 12000 year-old Vedde Ash is indistinguishable with several other ash layers in Iceland that are ~1000 years younger. Therefore, chemical composition alone cannot be used to identify the Vedde Ash in sedimentary records.
Jonathan H. Raberg, David J. Harning, Sarah E. Crump, Greg de Wet, Aria Blumm, Sebastian Kopf, Áslaug Geirsdóttir, Gifford H. Miller, and Julio Sepúlveda
Biogeosciences, 18, 3579–3603, https://doi.org/10.5194/bg-18-3579-2021, https://doi.org/10.5194/bg-18-3579-2021, 2021
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BrGDGT lipids are a proxy for temperature in lake sediments, but other parameters like pH can influence them, and seasonality can affect the temperatures they record. We find a warm-season bias at 43 new high-latitude sites. We also present a new method that deconvolves the effects of temperature, pH, and conductivity and generate global calibrations for these variables. Our study provides new paleoclimate tools, insight into brGDGTs at the biochemical level, and a new method for future study.
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The Cryosphere, 19, 3259–3277, https://doi.org/10.5194/tc-19-3259-2025, https://doi.org/10.5194/tc-19-3259-2025, 2025
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Our study analyzes rapid ice loss events (RILEs) in the Arctic, which are significant reductions in sea ice extent. RILEs are expected throughout the year, varying in frequency and duration with the seasons. Our research gives a year-round analysis of their characteristics in climate models and suggests that summer RILEs could begin before the middle of the century. Understanding these events is crucial as they can have profound impacts on the Arctic environment.
Kurt R. Lindberg, Elizabeth K. Thomas, Martha K. Raynolds, Helga Bültmann, and Jonathan H. Raberg
EGUsphere, https://doi.org/10.5194/egusphere-2025-3849, https://doi.org/10.5194/egusphere-2025-3849, 2025
This preprint is open for discussion and under review for Biogeosciences (BG).
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Plant waxes are an important tool for inferring past changes in vegetation and the water cycle. However, the mechanisms governing the production of plant waxes and their stable isotopes are not well understood in Arctic plants. We found that terrestrial Arctic plant waxes are not significantly influenced by environmental parameters including temperature, precipitation, humidity, and elevation. These findings agree with our understanding of plant wax production in other regions of the world.
Sudip Acharya, Allison A. Cluett, Amy L. Grogan, Jason P. Briner, Isla S. Castañeda, and Elizabeth K. Thomas
EGUsphere, https://doi.org/10.5194/egusphere-2025-3113, https://doi.org/10.5194/egusphere-2025-3113, 2025
This preprint is open for discussion and under review for Climate of the Past (CP).
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The study analyzed temperature-sensitive bacterial membrane lipids in Holocene Lake sediments from southwestern Greenland. Temperature maxima in five lakes occurred between 7000–5000 years ago, at a coastal site between 5000–3000 years ago, and at an inland site, far from the coast and the Greenland Ice Sheet, between 9000–7000 years ago. Local temperature variations, influenced by the ice sheet and ocean, likely caused discrepancies in the temperature time series.
Pengfei Xue, Chenfu Huang, Yafang Zhong, Michael Notaro, Miraj B. Kayastha, Xing Zhou, Chuyan Zhao, Christa Peters-Lidard, Carlos Cruz, and Eric Kemp
Geosci. Model Dev., 18, 4293–4316, https://doi.org/10.5194/gmd-18-4293-2025, https://doi.org/10.5194/gmd-18-4293-2025, 2025
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This study introduces a new 3D lake–ice–atmosphere coupled model that significantly improves winter climate simulations for the Great Lakes compared to traditional 1D lake model coupling. The key contribution is the identification of critical hydrodynamic processes – ice transport, heat advection, and shear-driven turbulence production – that influence lake thermal structure and ice cover and explain the superior performance of 3D lake models to their 1D counterparts.
Jacob T. H. Anderson, Nicolás E. Young, Allie Balter-Kennedy, Karlee K. Prince, Caleb K. Walcott-George, Brandon L. Graham, Joanna Charton, Jason P. Briner, and Joerg M. Schaefer
EGUsphere, https://doi.org/10.5194/egusphere-2025-2780, https://doi.org/10.5194/egusphere-2025-2780, 2025
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We investigated retreat of the Greenland Ice Sheet during the last deglaciation by dating glacial deposits exposed as the ice margin retreated. Our results from eastern and northeastern Greenland reveal ice margin retreat rates of 43 m/yr and 28 m/yr at two marine-terminating outlet glaciers. These retreat rates are consistent with late glacial and Holocene estimates across East Greenland, and are comparable to modern retreat rates observed in northeastern and northwestern Greenland.
Caleb K. Walcott-George, Allie Balter-Kennedy, Jason P. Briner, Joerg M. Schaefer, and Nicolás E. Young
The Cryosphere, 19, 2067–2086, https://doi.org/10.5194/tc-19-2067-2025, https://doi.org/10.5194/tc-19-2067-2025, 2025
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Understanding the history and drivers of Greenland Ice Sheet change is important for forecasting future ice sheet retreat. We combined geologic mapping and cosmogenic nuclide measurements to investigate how the Greenland Ice Sheet formed the landscape of Inglefield Land, northwestern Greenland. We found that Inglefield Land was covered by warm- and cold-based ice during multiple glacial cycles and that much of Inglefield Land is an ancient landscape.
David J. Harning, Christopher R. Florian, Áslaug Geirsdóttir, Thor Thordarson, Gifford H. Miller, Yarrow Axford, and Sædís Ólafsdóttir
Clim. Past, 21, 795–815, https://doi.org/10.5194/cp-21-795-2025, https://doi.org/10.5194/cp-21-795-2025, 2025
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Questions remain about the past climate in Iceland, including the relative impacts of natural and human factors on vegetation change and soil erosion. We present a sub-centennial-scale record of landscape and algal productivity from a lake in north Iceland. Along with a high-resolution tephra age constraint that covers the last ∼ 12 000 years, our record provides an environmental template for the region and novel insight into the sensitivity of the Icelandic ecosystem to natural and human impacts.
Joseph P. Tulenko, Sophie A. Goliber, Renette Jones-Ivey, Justin Quinn, Abani Patra, Kristin Poinar, Sophie Nowicki, Beata M. Csatho, and Jason P. Briner
EGUsphere, https://doi.org/10.5194/egusphere-2025-894, https://doi.org/10.5194/egusphere-2025-894, 2025
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Ghub is an online platform that hosts tools, datasets and educational resources related to ice sheet science. These resources are provided by ice sheet researchers and allow other researchers, students, educators, and interested members of the general public to analyze, visualize and download datasets that researchers use to study past and present ice sheet behavior. We describe how users can interact with Ghub, showcase some available resources, and describe the future of the Ghub Project.
Bianca C. Baier, John B. Miller, Colm Sweeney, Scott Lehman, Chad Wolak, Joshua P. DiGangi, Yonghoon Choi, Kenneth Davis, Sha Feng, and Thomas Lauvaux
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CO2 radiocarbon content (Δ14CO2) is a unique tracer helps to accurately quantify anthropogenic CO2 emitted into the atmosphere. Δ14CO2 measured in airborne flask samples is used to distinguish fossil versus biogenic CO2 sources. Mid-Atlantic U.S. CO2 variability is found to be driven by the biosphere. Errors in modeled fossil fuel CO2 are evaluated using Δ14CO2 airborne data as an avenue to improving future regional models of atmospheric CO2 transport.
David J. Harning, Jonathan H. Raberg, Jamie M. McFarlin, Yarrow Axford, Christopher R. Florian, Kristín B. Ólafsdóttir, Sebastian Kopf, Julio Sepúlveda, Gifford H. Miller, and Áslaug Geirsdóttir
Hydrol. Earth Syst. Sci., 28, 4275–4293, https://doi.org/10.5194/hess-28-4275-2024, https://doi.org/10.5194/hess-28-4275-2024, 2024
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As human-induced global warming progresses, changes to Arctic precipitation are expected, but predictions are limited by an incomplete understanding of past changes in the hydrological system. Here, we measured water isotopes, a common tool to reconstruct past precipitation, from lakes, streams, and soils across Iceland. These data will allow robust reconstruction of past precipitation changes in Iceland in future studies.
Xiaoran Zhu, Dong Chen, Maruko Kogure, Elizabeth Hoy, Logan T. Berner, Amy L. Breen, Abhishek Chatterjee, Scott J. Davidson, Gerald V. Frost, Teresa N. Hollingsworth, Go Iwahana, Randi R. Jandt, Anja N. Kade, Tatiana V. Loboda, Matt J. Macander, Michelle Mack, Charles E. Miller, Eric A. Miller, Susan M. Natali, Martha K. Raynolds, Adrian V. Rocha, Shiro Tsuyuzaki, Craig E. Tweedie, Donald A. Walker, Mathew Williams, Xin Xu, Yingtong Zhang, Nancy French, and Scott Goetz
Earth Syst. Sci. Data, 16, 3687–3703, https://doi.org/10.5194/essd-16-3687-2024, https://doi.org/10.5194/essd-16-3687-2024, 2024
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The Arctic tundra is experiencing widespread physical and biological changes, largely in response to warming, yet scientific understanding of tundra ecology and change remains limited due to relatively limited accessibility and studies compared to other terrestrial biomes. To support synthesis research and inform future studies, we created the Synthesized Alaskan Tundra Field Dataset (SATFiD), which brings together field datasets and includes vegetation, active-layer, and fire properties.
Benjamin A. Keisling, Joerg M. Schaefer, Robert M. DeConto, Jason P. Briner, Nicolás E. Young, Caleb K. Walcott, Gisela Winckler, Allie Balter-Kennedy, and Sridhar Anandakrishnan
EGUsphere, https://doi.org/10.5194/egusphere-2024-2427, https://doi.org/10.5194/egusphere-2024-2427, 2024
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Understanding how much the Greenland ice sheet melted in response to past warmth helps better predicting future sea-level change. Here we present a framework for using numerical ice-sheet model simulations to provide constraints on how much mass the ice sheet loses before different areas become ice-free. As observations from subglacial archives become more abundant, this framework can guide subglacial sampling efforts to gain the most robust information about past ice-sheet geometries.
Karlee K. Prince, Jason P. Briner, Caleb K. Walcott, Brooke M. Chase, Andrew L. Kozlowski, Tammy M. Rittenour, and Erica P. Yang
Geochronology, 6, 409–427, https://doi.org/10.5194/gchron-6-409-2024, https://doi.org/10.5194/gchron-6-409-2024, 2024
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We fill a spatial data gap in the ice sheet retreat history of the Laurentide Ice Sheet after the Last Glacial Maximum and investigate a hypothesis that the ice sheet re-advanced into western New York, USA, at ~13 ka. With radiocarbon and optically stimulated luminescence (OSL) dating, we find that ice began retreating from its maximum extent after 20 ka, but glacial ice persisted in glacial landforms until ~15–14 ka when they finally stabilized. We find no evidence of a re-advance at ~13 ka.
Nicolò Ardenghi, David J. Harning, Jonathan H. Raberg, Brooke R. Holman, Thorvaldur Thordarson, Áslaug Geirsdóttir, Gifford H. Miller, and Julio Sepúlveda
Clim. Past, 20, 1087–1123, https://doi.org/10.5194/cp-20-1087-2024, https://doi.org/10.5194/cp-20-1087-2024, 2024
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Analysing a sediment record from Stóra Viðarvatn (NE Iceland), we reveal how natural factors and human activities influenced environmental changes (erosion, wildfires) over the last 11 000 years. We found increased fire activity around 3000 and 1500 years ago, predating human settlement, likely driven by natural factors like precipitation shifts. Declining summer temperatures increased erosion vulnerability, exacerbated by farming and animal husbandry, which in turn may have reduced wildfires.
Bjorn Stevens, Stefan Adami, Tariq Ali, Hartwig Anzt, Zafer Aslan, Sabine Attinger, Jaana Bäck, Johanna Baehr, Peter Bauer, Natacha Bernier, Bob Bishop, Hendryk Bockelmann, Sandrine Bony, Guy Brasseur, David N. Bresch, Sean Breyer, Gilbert Brunet, Pier Luigi Buttigieg, Junji Cao, Christelle Castet, Yafang Cheng, Ayantika Dey Choudhury, Deborah Coen, Susanne Crewell, Atish Dabholkar, Qing Dai, Francisco Doblas-Reyes, Dale Durran, Ayoub El Gaidi, Charlie Ewen, Eleftheria Exarchou, Veronika Eyring, Florencia Falkinhoff, David Farrell, Piers M. Forster, Ariane Frassoni, Claudia Frauen, Oliver Fuhrer, Shahzad Gani, Edwin Gerber, Debra Goldfarb, Jens Grieger, Nicolas Gruber, Wilco Hazeleger, Rolf Herken, Chris Hewitt, Torsten Hoefler, Huang-Hsiung Hsu, Daniela Jacob, Alexandra Jahn, Christian Jakob, Thomas Jung, Christopher Kadow, In-Sik Kang, Sarah Kang, Karthik Kashinath, Katharina Kleinen-von Königslöw, Daniel Klocke, Uta Kloenne, Milan Klöwer, Chihiro Kodama, Stefan Kollet, Tobias Kölling, Jenni Kontkanen, Steve Kopp, Michal Koran, Markku Kulmala, Hanna Lappalainen, Fakhria Latifi, Bryan Lawrence, June Yi Lee, Quentin Lejeun, Christian Lessig, Chao Li, Thomas Lippert, Jürg Luterbacher, Pekka Manninen, Jochem Marotzke, Satoshi Matsouoka, Charlotte Merchant, Peter Messmer, Gero Michel, Kristel Michielsen, Tomoki Miyakawa, Jens Müller, Ramsha Munir, Sandeep Narayanasetti, Ousmane Ndiaye, Carlos Nobre, Achim Oberg, Riko Oki, Tuba Özkan-Haller, Tim Palmer, Stan Posey, Andreas Prein, Odessa Primus, Mike Pritchard, Julie Pullen, Dian Putrasahan, Johannes Quaas, Krishnan Raghavan, Venkatachalam Ramaswamy, Markus Rapp, Florian Rauser, Markus Reichstein, Aromar Revi, Sonakshi Saluja, Masaki Satoh, Vera Schemann, Sebastian Schemm, Christina Schnadt Poberaj, Thomas Schulthess, Cath Senior, Jagadish Shukla, Manmeet Singh, Julia Slingo, Adam Sobel, Silvina Solman, Jenna Spitzer, Philip Stier, Thomas Stocker, Sarah Strock, Hang Su, Petteri Taalas, John Taylor, Susann Tegtmeier, Georg Teutsch, Adrian Tompkins, Uwe Ulbrich, Pier-Luigi Vidale, Chien-Ming Wu, Hao Xu, Najibullah Zaki, Laure Zanna, Tianjun Zhou, and Florian Ziemen
Earth Syst. Sci. Data, 16, 2113–2122, https://doi.org/10.5194/essd-16-2113-2024, https://doi.org/10.5194/essd-16-2113-2024, 2024
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To manage Earth in the Anthropocene, new tools, new institutions, and new forms of international cooperation will be required. Earth Virtualization Engines is proposed as an international federation of centers of excellence to empower all people to respond to the immense and urgent challenges posed by climate change.
Joseph P. Tulenko, Jason P. Briner, Nicolás E. Young, and Joerg M. Schaefer
Clim. Past, 20, 625–636, https://doi.org/10.5194/cp-20-625-2024, https://doi.org/10.5194/cp-20-625-2024, 2024
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We take advantage of a site in Alaska – where climate records are limited and a former alpine glacier deposited a dense sequence of moraines spanning the full deglaciation – to construct a proxy summer temperature record. Building on age constraints for moraines in the valley, we reconstruct paleo-glacier surfaces and estimate the summer temperatures (relative to the Little Ice Age) for each moraine. The record suggests that the influence of North Atlantic climate forcing extended to Alaska.
Marika M. Holland, Cecile Hannay, John Fasullo, Alexandra Jahn, Jennifer E. Kay, Michael Mills, Isla R. Simpson, William Wieder, Peter Lawrence, Erik Kluzek, and David Bailey
Geosci. Model Dev., 17, 1585–1602, https://doi.org/10.5194/gmd-17-1585-2024, https://doi.org/10.5194/gmd-17-1585-2024, 2024
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Climate evolves in response to changing forcings, as prescribed in simulations. Models and forcings are updated over time to reflect new understanding. This makes it difficult to attribute simulation differences to either model or forcing changes. Here we present new simulations which enable the separation of model structure and forcing influence between two widely used simulation sets. Results indicate a strong influence of aerosol emission uncertainty on historical climate.
Caleb K. Walcott, Jason P. Briner, Joseph P. Tulenko, and Stuart M. Evans
Clim. Past, 20, 91–106, https://doi.org/10.5194/cp-20-91-2024, https://doi.org/10.5194/cp-20-91-2024, 2024
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Available data suggest that Alaska was not as cold as many of the high-latitude areas of the Northern Hemisphere during the Last Ice Age. These results come from isolated climate records, climate models, and data synthesis projects. We used the extents of mountain glaciers during the Last Ice Age and Little Ice Age to show precipitation gradients across Alaska and provide temperature data from across the whole state. Our findings support a relatively warm Alaska during the Last Ice Age.
Jinsol Kim, John B. Miller, Charles E. Miller, Scott J. Lehman, Sylvia E. Michel, Vineet Yadav, Nick E. Rollins, and William M. Berelson
Atmos. Chem. Phys., 23, 14425–14436, https://doi.org/10.5194/acp-23-14425-2023, https://doi.org/10.5194/acp-23-14425-2023, 2023
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In this study, we present the partitioning of CO2 signals from biogenic, petroleum and natural gas sources by combining CO, 13CO2 and 14CO2 measurements. Using measurements from flask air samples at three sites in the greater Los Angeles region, we find larger and positive contributions of biogenic signals in winter and smaller and negative contributions in summer. The largest contribution of natural gas combustion generally occurs in summer.
Brandon L. Graham, Jason P. Briner, Nicolás E. Young, Allie Balter-Kennedy, Michele Koppes, Joerg M. Schaefer, Kristin Poinar, and Elizabeth K. Thomas
The Cryosphere, 17, 4535–4547, https://doi.org/10.5194/tc-17-4535-2023, https://doi.org/10.5194/tc-17-4535-2023, 2023
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Glacial erosion is a fundamental process operating on Earth's surface. Two processes of glacial erosion, abrasion and plucking, are poorly understood. We reconstructed rates of abrasion and quarrying in Greenland. We derive a total glacial erosion rate of 0.26 ± 0.16 mm per year. We also learned that erosion via these two processes is about equal. Because the site is similar to many other areas covered by continental ice sheets, these results may be applied to many places on Earth.
David Harning, Thor Thordarson, Áslaug Geirsdóttir, Gifford Miller, and Christopher Florian
Geochronology Discuss., https://doi.org/10.5194/gchron-2022-26, https://doi.org/10.5194/gchron-2022-26, 2022
Preprint withdrawn
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Volcanic ash layers are a common tool to synchronize records of past climate, and their estimated age relies on external dating methods. Here, we show that the chemical composition of the well-known, 12000 year-old Vedde Ash is indistinguishable with several other ash layers in Iceland that are ~1000 years younger. Therefore, chemical composition alone cannot be used to identify the Vedde Ash in sedimentary records.
Jason P. Briner, Caleb K. Walcott, Joerg M. Schaefer, Nicolás E. Young, Joseph A. MacGregor, Kristin Poinar, Benjamin A. Keisling, Sridhar Anandakrishnan, Mary R. Albert, Tanner Kuhl, and Grant Boeckmann
The Cryosphere, 16, 3933–3948, https://doi.org/10.5194/tc-16-3933-2022, https://doi.org/10.5194/tc-16-3933-2022, 2022
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The 7.4 m of sea level equivalent stored as Greenland ice is getting smaller every year. The uncertain trajectory of ice loss could be better understood with knowledge of the ice sheet's response to past climate change. Within the bedrock below the present-day ice sheet is an archive of past ice-sheet history. We analyze all available data from Greenland to create maps showing where on the ice sheet scientists can drill, using currently available drills, to obtain sub-ice materials.
Abigail Smith, Alexandra Jahn, Clara Burgard, and Dirk Notz
The Cryosphere, 16, 3235–3248, https://doi.org/10.5194/tc-16-3235-2022, https://doi.org/10.5194/tc-16-3235-2022, 2022
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The timing of Arctic sea ice melt each year is an important metric for assessing how sea ice in climate models compares to satellite observations. Here, we utilize a new tool for creating more direct comparisons between climate model projections and satellite observations of Arctic sea ice, such that the melt onset dates are defined the same way. This tool allows us to identify climate model biases more clearly and gain more information about what the satellites are observing.
Joshua K. Cuzzone, Nicolás E. Young, Mathieu Morlighem, Jason P. Briner, and Nicole-Jeanne Schlegel
The Cryosphere, 16, 2355–2372, https://doi.org/10.5194/tc-16-2355-2022, https://doi.org/10.5194/tc-16-2355-2022, 2022
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We use an ice sheet model to determine what influenced the Greenland Ice Sheet to retreat across a portion of southwestern Greenland during the Holocene (about the last 12 000 years). Our simulations, constrained by observations from geologic markers, show that atmospheric warming and ice melt primarily caused the ice sheet to retreat rapidly across this domain. We find, however, that iceberg calving at the interface where the ice meets the ocean significantly influenced ice mass change.
Caleb K. Walcott, Jason P. Briner, James F. Baichtal, Alia J. Lesnek, and Joseph M. Licciardi
Geochronology, 4, 191–211, https://doi.org/10.5194/gchron-4-191-2022, https://doi.org/10.5194/gchron-4-191-2022, 2022
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We present a record of ice retreat from the northern Alexander Archipelago, Alaska. During the last ice age (~ 26 000–19 000 years ago), these islands were covered by the Cordilleran Ice Sheet. We tested whether islands were ice-free during the last ice age for human migrants moving from Asia to the Americas. We found that these islands became ice-free between ~ 15 100 years ago and ~ 16 000 years ago, and thus these islands were not suitable for human habitation during the last ice age.
Jonathan H. Raberg, David J. Harning, Sarah E. Crump, Greg de Wet, Aria Blumm, Sebastian Kopf, Áslaug Geirsdóttir, Gifford H. Miller, and Julio Sepúlveda
Biogeosciences, 18, 3579–3603, https://doi.org/10.5194/bg-18-3579-2021, https://doi.org/10.5194/bg-18-3579-2021, 2021
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BrGDGT lipids are a proxy for temperature in lake sediments, but other parameters like pH can influence them, and seasonality can affect the temperatures they record. We find a warm-season bias at 43 new high-latitude sites. We also present a new method that deconvolves the effects of temperature, pH, and conductivity and generate global calibrations for these variables. Our study provides new paleoclimate tools, insight into brGDGTs at the biochemical level, and a new method for future study.
Douglas P. Steen, Joseph S. Stoner, Jason P. Briner, and Darrell S. Kaufman
Geochronology Discuss., https://doi.org/10.5194/gchron-2021-19, https://doi.org/10.5194/gchron-2021-19, 2021
Publication in GChron not foreseen
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Paleomagnetic data from Cascade Lake (Brooks Range, Alaska) extend the radiometric-based age model of the sedimentary sequence extending back 21 kyr. Correlated ages based on prominent features in paleomagnetic secular variations (PSV) diverge from the radiometric ages in the upper 1.6 m, by up to about 2000 years at around 4 ka. Four late Holocene cryptotephra in this section support the PSV chronology and suggest the influence of hard water or aged organic material.
Svend Funder, Anita H. L. Sørensen, Nicolaj K. Larsen, Anders A. Bjørk, Jason P. Briner, Jesper Olsen, Anders Schomacker, Laura B. Levy, and Kurt H. Kjær
Clim. Past, 17, 587–601, https://doi.org/10.5194/cp-17-587-2021, https://doi.org/10.5194/cp-17-587-2021, 2021
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Cosmogenic 10Be exposure dates from outlying islets along 300 km of the SW Greenland coast indicate that, although affected by inherited 10Be, the ice margin here was retreating during the Younger Dryas. These results seem to be corroborated by recent studies elsewhere in Greenland. The apparent mismatch between temperatures and ice margin behaviour may be explained by the advection of warm water to the ice margin on the shelf and by increased seasonality, both caused by a weakened AMOC.
Nicolás E. Young, Alia J. Lesnek, Josh K. Cuzzone, Jason P. Briner, Jessica A. Badgeley, Alexandra Balter-Kennedy, Brandon L. Graham, Allison Cluett, Jennifer L. Lamp, Roseanne Schwartz, Thibaut Tuna, Edouard Bard, Marc W. Caffee, Susan R. H. Zimmerman, and Joerg M. Schaefer
Clim. Past, 17, 419–450, https://doi.org/10.5194/cp-17-419-2021, https://doi.org/10.5194/cp-17-419-2021, 2021
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Retreat of the Greenland Ice Sheet (GrIS) margin is exposing a bedrock landscape that holds clues regarding the timing and extent of past ice-sheet minima. We present cosmogenic nuclide measurements from recently deglaciated bedrock surfaces (the last few decades), combined with a refined chronology of southwestern Greenland deglaciation and model simulations of GrIS change. Results suggest that inland retreat of the southwestern GrIS margin was likely minimal in the middle to late Holocene.
David J. Harning, Anne E. Jennings, Denizcan Köseoğlu, Simon T. Belt, Áslaug Geirsdóttir, and Julio Sepúlveda
Clim. Past, 17, 379–396, https://doi.org/10.5194/cp-17-379-2021, https://doi.org/10.5194/cp-17-379-2021, 2021
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Today, the waters north of Iceland are characterized by high productivity that supports a diverse food web. However, it is not known how this may change and impact Iceland's economy with future climate change. Therefore, we explored how the local productivity has changed in the past 8000 years through fossil and biogeochemical indicators preserved in Icelandic marine mud. We show that this productivity relies on the mixing of Atlantic and Arctic waters, which migrate north under warming.
Haeyoung Lee, Edward J. Dlugokencky, Jocelyn C. Turnbull, Sepyo Lee, Scott J. Lehman, John B. Miller, Gabrielle Pétron, Jeong-Sik Lim, Gang-Woong Lee, Sang-Sam Lee, and Young-San Park
Atmos. Chem. Phys., 20, 12033–12045, https://doi.org/10.5194/acp-20-12033-2020, https://doi.org/10.5194/acp-20-12033-2020, 2020
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To understand South Korea's CO2 emissions and sinks as well as those of the surrounding region, we used flask-air samples collected for 2 years at Anmyeondo (36.53° N, 126.32° E; 46 m a.s.l.), South Korea, for analysis of observed 14C in atmospheric CO2 as a tracer of fossil fuel CO2 contribution (Cff). Here, we showed our observation result of 14C and Cff. SF6 and CO can be good proxies of Cff in this study, and the ratio of CO to Cff was compared to a bottom-up inventory.
Abigail Smith, Alexandra Jahn, and Muyin Wang
The Cryosphere, 14, 2977–2997, https://doi.org/10.5194/tc-14-2977-2020, https://doi.org/10.5194/tc-14-2977-2020, 2020
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The annual cycle of Arctic sea ice can be used to gain more information about how climate model simulations of sea ice compare to observations. In some models, the September sea ice area agrees with observations for the wrong reasons because biases in the timing of seasonal transitions compensate for other unrealistic sea ice characteristics. This research was done to provide new process-based metrics of Arctic sea ice using satellite observations, the CESM Large Ensemble, and CMIP6 models.
Joseph P. Tulenko, William Caffee, Avriel D. Schweinsberg, Jason P. Briner, and Eric M. Leonard
Geochronology, 2, 245–255, https://doi.org/10.5194/gchron-2-245-2020, https://doi.org/10.5194/gchron-2-245-2020, 2020
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We investigate the timing and rate of retreat for three alpine glaciers in the southern Rocky Mountains to test whether they followed the pattern of global climate change or were majorly influenced by regional forcing mechanisms. We find that the latter is most likely for these glaciers. Our conclusions are based on a new 10Be chronology of alpine glacier retreat. We quantify retreat rates for each valley using the BACON program in R, which may be of interest for the audience of Geochronology.
Cited articles
Anderson, R. K., Miller, G. H., Briner, J. P., Lifton, N. A., and DeVogel, S. B.: A millennial perspective on Arctic warming from 14C in quartz and plants emerging from beneath ice caps. 2008, Geophys. Res. Lett., 35, L01502, https://doi.org/10.1029/2007GL032057, 2008.
Andrews, J. T. and Mahaffy, M. A. W.: Growth Rate of the Laurentide Ice Sheet and Sea Level Lowering (with Emphasis on the 115,000 BP Sea Level Low), Quaternary Res., 6, 167–83, 1976.
Andrews, J. T., Davis, P. T., Wright, C.: Little Ice Age permanent snowcover in the Eastern Canadian Arctic: Extent mapper from LandSat-1 satellite imagery, Geog. Annaler, 58A, 71–81, 1976.
Anonymous: https://portal.nersc.gov/archive/home/c/ccsm/www/CESM-CAM5-SF-No/atm/proc/tseries/monthly/TREFHT (last access: March 2023), created between April 2013 and April 2017.
Birch, L., Cronin, T., and Tziperman, E.: Glacial Inception on Baffin Island: The Role of Insolation, Meteorology, and Topography, J. Climate, 30, 4047–4064, https://doi.org/10.1175/JCLI-D-16-0576.1, 2017.
Birch, L., Cronin, T., and Tziperman, E.: The role of regional feedbacks in glacial inception on Baffin Island: the interaction of ice flow and meteorology, Clim. Past, 14, 1441–1462, https://doi.org/10.5194/cp-14-1441-2018, 2018.
Briner, J. P., Michelutti, N., Francis, D. R., Miller, G. H., Axford, Y., Wooller, M. J., Wolfe, A. P., Axford, Y., and Wolfe, A. P.: A Multi-Proxy Lacustrine Record of Holocene Climate Change on Northeastern Baffin Island, Arctic Canada, Quaternary Res., 65, 431–442, https://doi.org/10.1016/j.yqres.2005.10.005, 2006.
Briner, J. P., Davis, P. T., and Miller, G. H.: Latest Pleistocene and Holocene Glaciation of Baffin Island, Arctic Canada: Key Patterns and Chronologies, Quaternary Sci. Rev., 28, 2075–2087, 2009.
Briner, J. P., McKay, N. P., Axford, Y., Bennike, O., Bradley, R. S., de Vernal, A., Fisher, D., Francus, P., Fréchette, B., Gajewski, K., Jennings, A., Kaufman, D. S., Miller, G. H., Rouston, C., and Wagner, B.: Holocene Climate Change in Arctic Canada and Greenland, Quaternary Sci. Rev., 147, 340–364, https://doi.org/10.1016/j.quascirev.2016.02.010, 2016.
Büntgen, U., Myglan, V. S., Charpentier Ljungqvist, F., McCormick, M., Di Cosmo, N., Sigl, M., Jungclaus, J., Wagner, S., Krusic, P. J., Esper, J., Kaplan, J. O., de Vann, M. A. C., Luterbacher, J., Wacker, L., Tegel, W., and Kirdyanov, A. V.: Cooling and Societal Change during the Late Antique Little Ice Age from 536 to around 660 AD, Nat. Geosci., 9, 231–236, https://doi.org/10.1038/ngeo2652, 2016.
Calkin, P. E. and Ellis, J. M.: A Cirque-Glacier Chronology Based on Emergent Lichens and Mosses, J. Glaciol., 27, 511–515, https://doi.org/10.1017/S0022143000011576, 1981.
Clark, P. U., Clague, J. J., Curry, B. B., Dreimanis, A., Hicock, S. R., Miller, G. H., Berger, G. W., Eyles, N., Lamothe, M., Miller, B. B., Mott, R. J., Oldale, R. N., Stea, R. R., Szabo, J. P., Thorleifson, L. H., and Vincent, J.-S.: Initiation and Development of the Laurentide and Cordilleran Ice Sheets Following the Last Interglaciation, Quaternary Sci. Rev., 12, 79–114, https://doi.org/10.1016/0277-3791(93)90011-A, 1993.
Crump, S. E., Anderson, L. S., Miller, G. H., and Anderson, R. S.: Interpreting exposure ages from ice-cored moraines: a Neoglacial case study on Baffin Island, Arctic Canada, J. Quaternary Sci., 32, 1049–1062, 2017.
Davis, P. T.: Neoglacial moraines on Baffin Island, in: Quaternary Environments: Eastern Canadian Arctic, Baffin Bay and Western Greenland, edited by: Andrews, J. T., Allen and Unwin, Boston, 682–718, 1985.
Dyke, A. S.: An Outline of North American Deglaciation with Emphasis on Central and Northern Canada, Developments in Quaternary Science, 2, 373–424, https://doi.org/10.1016/S1571-0866(04)80209-4, 2004.
Falconer, G.: Preservation of vegetation and patterned ground under a thin ice body in northern Baffin Island, N.W.T. Geographical Bulletin, 8, 194–200, 1966.
Fyfe, J. C., Von Salzen, K., Gillett, N. P., Arora, V. K., Flato, G. M., and McConnell, J. R.: One Hundred Years of Arctic Surface Temperature Variation Due to Anthropogenic Influence, Sci. Rep., 3, 2645, https://doi.org/10.1038/srep02645, 2013.
Gardner, A., Moholdt, G., Arendt, A., and Wouters, B.: Accelerated contributions of Canada's Baffin and Bylot Island glaciers to sea level rise over the past half century, The Cryosphere, 6, 1103–1125, https://doi.org/10.5194/tc-6-1103-2012, 2012.
Goldewijk, K., Beusen, A., Van Drecht, G., and De Vos, M.: The HYDE 3.1 spatially explicit database of human-induced global land-use change over the past 12,000 years, Global Ecol. Biogeogr., 20, 73–86, https://doi.org/10.1111/j.1466-8238.2010.00587.x, 2011.
Government of Canada: Station Results – Historical Data, Government of Canada [data set], https://climate.weather.gc.ca/historical_data/search_historic_data_stations_e.html?searchType=stnName&timeframe=1&txtStationName=Dewar+Lakes&searchMethod=contains&optLimit=yearRange&StartYear=1840&EndYear=2023&Year=2023&Month=10&Day=29&selRowPerPage=25 (last access: April 2023), 2023.
Groff, D. V., Beilman, D. W., Yu, Z., Ford, D., and Xia, Z.: Kill Dates from Re-Exposed Black Mosses Constrain Past Glacier Advances in the Northern Antarctic Peninsula, Geology, 51, 257–261, https://doi.org/10.1130/g50314.1, 2023.
Harning, D. J., Geirsdóttir, Á., Miller, G. H., and Anderson, L.: Episodic Expansion of Drangajökull, Vestfirðir, Iceland, over the Last 3 Ka Culminating in Its Maximum Dimension during the Little Ice Age, Quaternary Sci. Rev., 152, 118–131, https://doi.org/10.1016/j.quascirev.2016.10.001, 2016.
Hurrell, J. W., Holland, M. M., Gent, P. R., Ghan, S., Kay, J. E., Kushner, P. J., Lamarque, J.-F., Large, W. G., Lawrence, D., Lindsay, K., Lipscomb, W. H., Long, M. C., Mahowald, N., Marsh, D. R., Neale, R. B., Rasch, P., Vavrus, S., Vertenstein, M., Bader, D., Collins, W. D., Hack, J. J., Kiehl, J., and Marshall, S.: The Community Earth System Model: A Framework for Collaborative Research, B. Am. Meteorol. Soc., 94, 1339–1360, https://doi.org/10.1175/BAMS-D-12-00121.1, 2013.
Ives, J. D.: Glaciation of the Torngat Mountains, Northern Labrador, Arctic, 10, 67–87, 1957.
Ives, J. D.: Indications of recent extensive glacierization in north-central Baffin Island, NWT, J. Glaciol., 4, 197–205, https://doi.org/10.3189/S0022143000027398, 1962.
Ives, J. D., Andrews, J. T., and Barry, R. G.: Growth and Decay of the Laurentide Ice Sheet and Comparisons with Fenno-Scandinavia, Die Naturwissenschaften, 62, 118–125, 1975.
Jungclaus, J. H., Bard, E., Baroni, M., Braconnot, P., Cao, J., Chini, L. P., Egorova, T., Evans, M., González-Rouco, J. F., Goosse, H., Hurtt, G. C., Joos, F., Kaplan, J. O., Khodri, M., Klein Goldewijk, K., Krivova, N., LeGrande, A. N., Lorenz, S. J., Luterbacher, J., Man, W., Maycock, A. C., Meinshausen, M., Moberg, A., Muscheler, R., Nehrbass-Ahles, C., Otto-Bliesner, B. I., Phipps, S. J., Pongratz, J., Rozanov, E., Schmidt, G. A., Schmidt, H., Schmutz, W., Schurer, A., Shapiro, A. I., Sigl, M., Smerdon, J. E., Solanki, S. K., Timmreck, C., Toohey, M., Usoskin, I. G., Wagner, S., Wu, C.-J., Yeo, K. L., Zanchettin, D., Zhang, Q., and Zorita, E.: The PMIP4 contribution to CMIP6 – Part 3: The last millennium, scientific objective, and experimental design for the PMIP4 past1000 simulations, Geosci. Model Dev., 10, 4005–4033, https://doi.org/10.5194/gmd-10-4005-2017, 2017.
Kaufman, D. S., Schneider, D. P., McKay, et al.: Recent warming reverses long-term Arctic cooling, Science, 325, 1236–1239, 2009.
Kleman, J., Fastook, J., and Stroeven, A. P.: Geologically and Geomorphologically Constrained Numerical Model of Laurentide Ice Sheet Inception and Build-Up, Quaternary Int., 95–96, 87–98, 2002.
Koerner, R. M.: Mass Balance of Glaciers in the Queen Elizabeth Islands, Nunavut, Canada, Ann. Glaciol., 42, 417–423, https://doi.org/10.3189/172756405781813122, 2005.
Larsen, D. J., Miller, G. H., Geirsdóttir, Á., and Thordarson, T.: A 3000-Year Varved Record of Glacier Activity and Climate Change from the Proglacial Lake Hvítárvatn, Iceland, Quaternary Sci. Rev., 30, 19–20, https://doi.org/10.1016/j.quascirev.2011.05.026, 2011.
Lecavalier, B. S., Fisher, D. A., Milne, G. A., Vinther, B. M., Tarasov, L., Huybrechts, P., Lacelle, D., Main, B., Zheng, J., Bourgeois, J., and Dyke, J. S.: High Arctic Holocene Temperature Record from the Agassiz Ice Cap and Greenland Ice Sheet Evolution, P. Natl. Acad. Sci. USA, 114, 5952–5957, https://doi.org/10.1073/pnas.1616287114, 2017.
Lenaerts, J. T. M., Van Angelen, J. H., Van Den Broeke, M. R., Gardner, A. S., Wouters, B., and Van Meijgaard, E.: Irreversible Mass Loss of Canadian Arctic Archipelago Glaciers, Geophys. Res. Lett., 40, 870–874, https://doi.org/10.1002/grl.50214, 2013.
Locke, C. W. and Locke III, W. L.: Little Ice Age Snow-Cover Extent and Paleoglaciation Thresholds: North-Central Baffin Island, N.W.T., Canada, Arct. Alp. Res., 23, 436–443, 1977.
Lowell, T. V., Hall, B. L., Kelly, M. A., Bennike, O., Lusas, A. R., Honsaker, W., Smith, C. A., Levy, L. B., Travis, S., and Denton, G. H.: Late Holocene Expansion of Istorvet Ice Cap, Liverpool Land, East Greenland, Quaternary Sci. Rev., 63, 128–140, https://doi.org/10.1016/j.quascirev.2012.11.012, 2013.
Lubinski, D. J., Forman, S. L., and Miller, G. H.: Holocene glacier and climate fluctuations on Franz Josef land, arctic Russia, 80∘ N, Quaternary Sci. Rev., 18, 85–108, 1999.
z MacFarling Meure, C., Etheridge, D., Trudinger, C., Steele, P., Langenfelds, R., Van Ommen, T., Smith, A., and Elkins, J.: Law Dome CO2, CH4 and N2O Ice Core Records Extended to 2000 Years BP, Geophys. Res. Lett., 33, 2000–2003, https://doi.org/10.1029/2006GL026152, 2006.
Margreth, A., Dyke, A. S., Gosse, J. C., and Telka, A. M.: Neoglacial Ice Expansion and Late Holocene Cold-Based Ice Cap Dynamics on Cumberland Peninsula, Baffin Island, Arctic Canada, Quaternary Sci. Rev., 91, 242–256, https://doi.org/10.1016/j.quascirev.2014.02.005, 2014.
McKay, N. P. and Kaufman, D. S.: An extended Arctic proxy temperature database for the past 2,000 years, Sci. Data, 1, 140026, https://doi.org/10.1038/sdata.2014.26, 2014.
Medford, A. K., Hall, B. L., Lowell, T. V., Kelly, M. A., Levy, L. B., Wilcox, P. S., and Axford, Y.: Holocene Glacial History of Renland Ice Cap, East Greenland, Reconstructed from Lake Sediments, Quaternary Sci. Rev., 258, 106883, https://doi.org/10.1016/j.quascirev.2021.106883, 2021.
Medrzycka, D., Copland, L., and Noël, B.: Rapid demise and committed loss of Bowman Glacier, Northern Ellesmere Island, Arctic Canada, J. Glaciol., 69, 1–14, 2023.
Meehl, G. A., Hu, A., Castruccio, F., England, M. H., Bates, S. C., Donabasoglu, G., McGregor, S., Arblaster, J. M., Xie, S.-P., and Rosenbloom, N.: Atlantic and Pacific tropics connected by mutually interactive decadal-timescale processes, Nat. Geosci., 14, 36–42, https://doi.org/10.1038/s41561-020-00669-x, 2020.
Miller, G. H.: Late Quaternary Glacial and Climatic History of Northern Cumberland Peninsula, Baffin Island, N.W.T., Canada, Quaternary Res., 3, 561–583, 1973.
Miller, G. H., Wolfe, A. P., Briner, J. P., Sauer, P. E., and Nesje, A.: Holocene Glaciation and Climate Evolution of Baffin Island, Arctic Canada, Quaternary Sci. Rev., 24, 1703–1721, https://doi.org/10.1016/j.quascirev.2004.06.021, 2005.
Miller, G. H., Alley, R. B., Brigham-Grette, J., Fitzpatrick, J. J., Polyak, L., Serreze, M. C., and White, J. W. C.: Arctic Amplification: Can the Past Constrain the Future?, Quaternary Sci. Rev., 29, 1779–1790, https://doi.org/10.1016/j.quascirev.2010.02.008, 2010.
Miller, G. H., Geirsdottir, A., Zhong, Y., Larsen, D. J., OttoBliesner, B., Holland, M. M., Bailey, D. A., Refsnider, K. A., Lehman, S. J., Southon, J. R., Anderson, C., Björnsson, H., and Thordarson, T.: Abrupt 20 Onset of the Little Ice Age Triggered by Volcanism and Sustained by Sea-Ice/Ocean Feedbacks, Geophys. Res. Lett., 39, L02708, https://doi.org/10.1029/2011GL050168, 2012.
Miller, G. H., Lehman, S. J., Refsnider, K. A., Southon, J. R., and Zhong, Y.: Unprecedented Recent Summer Warmth in Arctic Canada, Geophys. Res. Lett., 40, 5745–5751, https://doi.org/10.1002/2013GL057188, 2013.
Miller, G. H., Landvik, J. Y., Lehman, S. J., and Southon, J. R.: Episodic Neoglacial Snowline Descent and Glacier Expansion on Svalbard Reconstructed from the 14C Ages of Ice-Entombed Plants, Quaternary Sci. Rev., 155, 67–78, https://doi.org/10.1016/j.quascirev.2016.10.023, 2017.
Moore, J. J., Kughen, K. A., Miller, G. H., and Overpeck, J. T.: Little Ice Age Recorded in Summer Temperature Reconstruction from Varved Sediments of Donard Lake, Baffin Island, Canada, J. Paleolimnol., 25, 503–517, https://doi.org/10.1023/A:1011181301514, 2001.
Myhre, G., Samset, B. H., Schulz, M., Balkanski, Y., Bauer, S., Berntsen, T. K., Bian, H., Bellouin, N., Chin, M., Diehl, T., Easter, R. C., Feichter, J., Ghan, S. J., Hauglustaine, D., Iversen, T., Kinne, S., Kirkevåg, A., Lamarque, J.-F., Lin, G., Liu, X., Lund, M. T., Luo, G., Ma, X., van Noije, T., Penner, J. E., Rasch, P. J., Ruiz, A., Seland, Ø., Skeie, R. B., Stier, P., Takemura, T., Tsigaridis, K., Wang, P., Wang, Z., Xu, L., Yu, H., Yu, F., Yoon, J.-H., Zhang, K., Zhang, H., and Zhou, C.: Radiative forcing of the direct aerosol effect from AeroCom Phase II simulations, Atmos. Chem. Phys., 13, 1853–1877, https://doi.org/10.5194/acp-13-1853-2013, 2013.
Noël, B., van de Berg, W. J., Lhermitte, S., Wouters, B., Schaffer, N., and van den Broeke, M. R.: Six Decades of Glacial Mass Loss in the Canadian Arctic Archipelago, J. Geophys. Res.-Earth Surf., 123, 1430–1449, https://doi.org/10.1029/2017JF004304, 2018.
Otto-Bliesner, B. L., Brady, E. C., Fasullo, J., Jahn, A., Landrum, L., Stevenson, S., Rosenbloom, N., Mai, A., and Strand, G.: Climate Variability and Change since 850 Ce an Ensemble Approach with the Community Earth System Model, B. Am. Meteorol. Soc., 97, 787–801, https://doi.org/10.1175/BAMS-D-14-00233.1, 2016.
Pendleton, S. and Miller, G.: Radiocarbon dates and their probability density distributions for moss samples killed by expanding ice caps on northern Baffin Island, NU, Canada, 2005–2019, Arctic Data Center [data set], https://doi.org/10.18739/A2RN30884, 2023.
Pendleton, S. L., Miller, G. H., Anderson, R. A., Crump, S. E., Zhong, Y., Jahn, A., and Geirsdottir, Á.: Episodic Neoglacial expansion and rapid 20th century retreat of a small ice cap on Baffin Island, Arctic Canada, and modeled temperature change, Clim. Past, 13, 1527–1537, https://doi.org/10.5194/cp-13-1527-2017, 2017.
Pendleton, S. L., Miller, G. H., Lifton, N., Lehman, S. J., Southon, J., Crump, S. E., and Anderson, R. S.: Rapidly Receding Arctic Canada Glaciers Revealing Landscapes Continuously Ice-Covered for More than 40,000 Years, Nat. Commun., 10, 1–8, https://doi.org/10.1038/s41467-019-08307-w, 2019a.
Pendleton, S., Miller, G., Lifton, N., and Young, N.: Cryosphere Response Resolves Conflicting Evidence for the Timing of Peak Holocene Warmth on Baffin Island, Arctic Canada, Quaternary Sci. Rev., 216, 107–115, https://doi.org/10.1016/j.quascirev.2019.05.015, 2019b.
Ramsey, C. B., Staff, R. A., Bryant, C. L., Brock, F., Kitagawa, H., Van Der Plicht, J., Schlolaut, G., Marshall, M. H., Brauer, A., Lamb, H. F., Payne, R. L., Tarasov, P. E., Haraguchi, T., Gotanda, K., Yonenobu, H., Yokoyama, Y., Tada, R., and Nakagawa, T.: A Complete Terrestrial Radiocarbon Record for 11.2 to 52.8 Kyr B.P., Science, 338, 370–374, https://doi.org/10.1126/science.1226660, 2012.
Rantanen, M., Karpechko, A. Y., Lipponen, A., Nordling, K., Hyvärinen, O., Ruosteenoja, K., Vihma, T., and Laaksonen, A.: The Arctic has warmed nearly four times faster than the globe since 1979, Commun. Earth Environ., 3, 168, https://doi.org/10.1038/s43247-022-00498-3, 2022.
Reimer, P. J., Austin, W. E. N., Bard, E., Bayliss, A., Blackwell, P. G., Ramsey, C. B., Butzin, M., Cheng, H., Edwards, R. L., Friedrich, M., Grootes, P. M., Guilderson, T. P., Hajdas, I., Heaton, T. J., Hogg, A. G., Hughen, K., A., Kromer, B., Manning, S. W., Muschler, R., Palmer, J. G., Pearson, C., van der Plicht, J., Reimer, R. W., Richards, D. A., Scott, E., M., Southon, J. R., Turney, C. S. M., Wacker, L., Adolphi, F., Büntgen, U., Capano, M., Fahrni, S. M., Fogtmann-Schulz, A., Friedrich, R., Köhler, P., Kudsk, S., Miyake, F., Olsen, J., Reinig, F., Sakamoto, M., Sookdeo, A., and Talamo, S.: The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 Cal KBP), Radiocarbon, 62, 725–757, https://doi.org/10.1017/RDC.2020.41, 2020.
Schweinsberg, A. D., Briner, J. P., Miller, G. H., Bennike, O., and Thomas, E. K.: Local Glaciation in West Greenland Linked to North Atlantic Ocean Circulation during the Holocene, Geology, 45, 195–198, https://doi.org/10.1130/G38114.1, 2017.
Schweinsberg, A. D., Briner, J. P., Miller, G. H., Lifton, N. A., Bennike, O., and Graham, B. L.: Holocene Mountain Glacier History in the Sukkertoppen Iskappe Area, Southwest Greenland, Quaternary Sci. Rev., 197, 142–161, https://doi.org/10.1016/j.quascirev.2018.06.014, 2018.
Sigl, M., Winstrup, M., McConnel, J. R., and Welten, K. C.: Timing and climate forcing of volcanic eruptions for the past 2,500 years, Nature, 523, 543–549, https://doi.org/10.1038/nature14565, 2015.
Søndergaard, A. S., Krog Larsen, N., Olsen, J., Strunk, A., and Woodroffe, S.: Glacial History of the Greenland Ice Sheet and a Local Ice Cap in Qaanaaq, Northwest Greenland, J. Quaternary Sci., 34, 536–547, https://doi.org/10.1002/jqs.3139, 2019.
Stern, I.: Past2k: Transient simulation of the climate of the last 2000 years, Climate Data Gateway at NCAR [data set], https://www.earthsystemgrid.org/dataset/ucar.cgd.ccsm4.past2k_transient.html (last access: 30 October 2023), created 09:14:13, 13 January 2021, last updated 11:10:01, 26 September 2022.
Taylor, K. E., Stouffer, R. J., and Meehl, G. A.: An Overview of CMIP5 and the Experiment Design, B. Am. Meteorol. Soc., 93, 485–498, https://doi.org/10.1175/BAMS-D-11-00094.1, 2012.
Toohey, M., Krüger, K., Sigl, M., Stordal, F., and Svensen, H.: Climatic and societal impacts of a volcanic double event at the dawn of the Middle Ages, Clim. Change, 136, 401–412, 2016.
Werner, J. P., Divine, D. V., Charpentier Ljungqvist, F., Nilsen, T., and Francus, P.: Spatio-temporal variability of Arctic summer temperatures over the past 2 millennia, Clim. Past, 14, 527–557, https://doi.org/10.5194/cp-14-527-2018, 2018.
Williams, L. D.: The Little Ice Age Glaciation Level on Baffin Island, Arctic Canada, Palaeogeogr. Palaeocl., 25, 199–207, https://doi.org/10.1016/0031-0182(78)90036-6, 1978.
Wolken, G. J., England, J. H., and Dyke, A. S.: Re-Evaluating the Relevance of Vegetation Trimlines in the Canadian Arctic as an Indicator of Little Ice Age Paleoenvironments, Arctic, 58, 341–353, https://doi.org/10.14430/arctic448, 2005.
Xu, Y., Lin, L., Diao, C., Wang, Z., Bates, S., and Arblaster, J.: The response of precipitation extremes to the twentieth- and twenty-first-century global temperature change in a comprehensive suite of CESM1 large ensemble simulation: Revisiting the role of forcing agents vs. the role of forcing magnitudes, Earth Space Sci., 9, e2021EA002010, https://doi.org/10.1029/2021EA002010, 2022.
Yu, Z., Beilman, D. W., and Loisel, J.: Transformations of landscape and peat-forming ecosystems in response to late Holocene climate change in the western Antarctic Peninsula, Geophys. Res. Lett., 43, 7186–7195, 2016.
Zhao, A., Stevenson, D. S., and Bollasina, M. A.: Climate Forcing and Response to Greenhouse Gases, Aerosols, and Ozone in CESM1, J. Geophys. Res.-Atmos., 124, 13876–13894, https://doi.org/10.1029/2019JD030769, 2019.
Zhong, Y., Jahn, A., Miller, G. H., and Geirsdottir, A.: Asymmetric Cooling of the Atlantic and Pacific Arctic During the Past Two Millennia: A Dual Observation-Modeling Study, Geophys. Res. Lett., 45, 12497–12505, https://doi.org/10.1029/2018GL079447, 2018.
Short summary
Receding Arctic ice caps reveal moss killed by earlier ice expansions; 186 moss kill dates from 71 ice caps cluster at 250–450, 850–1000 and 1240–1500 CE and continued expanding 1500–1880 CE, as recorded by regions of sparse vegetation cover, when ice caps covered > 11 000 km2 but < 100 km2 at present. The 1880 CE state approached conditions expected during the start of an ice age; climate models suggest this was only reversed by anthropogenic alterations to the planetary energy balance.
Receding Arctic ice caps reveal moss killed by earlier ice expansions; 186 moss kill dates from...