Late Quaternary glacial maxima in southern Patagonia: insights from the Lago Argentino glacier lobe

Romero, Matias; Penprase, Shanti B.; Van Wyk de Vries, Maximillian S.; Wickert, Andrew D.; Jones, Andrew G.; Marcott, Shaun A.; Strelin, Jorge A.; Martini, Mateo A.; Rittenour, Tammy M.; Brignone, Guido; Shapley, Mark D.; Ito, Emi; MacGregor, Kelly R.; Caffee, Marc W.

doi:https://doi.org/10.5194/cp-20-1861-2024

Articles | Volume 20, issue 8

https://doi.org/10.5194/cp-20-1861-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Icy landscapes of the past (CP/ESSD/ESurf/TC inter-journal...

https://doi.org/10.5194/cp-20-1861-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 8

Research article

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28 Aug 2024

Research article | Highlight paper |

| 28 Aug 2024

Late Quaternary glacial maxima in southern Patagonia: insights from the Lago Argentino glacier lobe

Matias Romero, Shanti B. Penprase, Maximillian S. Van Wyk de Vries, Andrew D. Wickert, Andrew G. Jones, Shaun A. Marcott, Jorge A. Strelin, Mateo A. Martini, Tammy M. Rittenour, Guido Brignone, Mark D. Shapley, Emi Ito, Kelly R. MacGregor, and Marc W. Caffee

Department of Earth & Environmental Sciences, University of Minnesota, Minneapolis, MN 55455, USA

Saint Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN 55455, USA

School of Environmental Sciences, University of Liverpool, Liverpool, L3 5DA, UK

School of Geography and the Environment, University of Oxford, Oxford, OX1 3QY, UK

School of Geography, University of Nottingham, Nottingham, NG7 2RD, UK

Department of Geography, University of Cambridge, Cambridge, CB2 3EL, UK

Department of Earth Sciences, University of Cambridge, Cambridge, CB3 0EZ, UK

Supplement

https://doi.org/10.5194/cp-20-1861-2024-supplement

Data sets

Shapefiles of Lago Argentino - Rio Santa Cruz glacial landforms Matias Romero et al. https://doi.org/10.5281/zenodo.11556612

The NCEP/NCAR 40-Year Reanalysis Project (https://psl.noaa.gov/data/gridded/data.ncep.reanalysis.html) E. Kalnay et al. https://doi.org/10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2

Modelo Digital de Elevaciones Instituto Geográfico Nacional https://www.ign.gob.ar/NuestrasActividades/Geodesia/ModeloDigitalElevaciones/Introduccion

GEBCO 2024 Grid GEBCO Compilation Group https://doi.org/10.5285/1c44ce99-0a0d-5f4f-e063-7086abc0ea0f

ETOPO 2022 15 Arc-Second Global Relief Model NOAA National Centers for Environmental Information https://doi.org/10.25921/fd45-gt74

Model code and software

Insolation, The Climate Laboratory B. E. J. Rose https://climlab.readthedocs.io/en/latest/index.html

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Romero et al. mapped geomorphological features on the landscape and dated moraine boulders and outwash sediments to constrain past changes of the former Patagonian Ice Sheet in southern Argentina. They show that the Lago Argentino glacier expanded during Marine Isotope Stage 6 (153.0±14.7 ka) and during Marine Isotope Stage 3, culminating at 44.5±8.0 ka and at 36.6±1.0 ka, thus preceding the Last Glacial Maximum. They hypothesize that this was a result of longer and colder winters, as well as increased precipitation resulting from an equatorward shift of the Southern Hemisphere Westerlies.