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© 2023. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

We present a database of observational constraints on past Antarctic Ice Sheet changes during the last glacial cycle intended to consolidate the observations that represent our understanding of past Antarctic changes and for state-space estimation and paleo-model calibrations. The database is a major expansion of the initial work of Briggs and Tarasov (2013). It includes new data types and multi-tier data quality assessment. The updated constraint database, AntICE2 (https://theghub.org/resources/4884, Lecavalier et al., 2022), consists of observations of past grounded- and floating-ice-sheet extent, past ice thickness, past relative sea level, borehole temperature profiles, and present-day bedrock displacement rates. In addition to paleo-observations, the present-day ice sheet geometry and surface ice velocities are incorporated to constrain the present-day ice sheet configuration. The method by which the data are curated using explicitly defined criteria is detailed. Moreover, the observational uncertainties are specified. The methodology by which the constraint database can be applied to evaluate a given ice sheet reconstruction is discussed. The implementation of the AntICE2 database for Antarctic Ice Sheet model calibrations will improve Antarctic Ice Sheet predictions during past warm and cold periods and yield more robust paleo-model spin ups for forecasting future ice sheet changes.

Details

Title
Antarctic Ice Sheet paleo-constraint database
Author
Lecavalier, Benoit S 1 ; Tarasov, Lev 1 ; Balco, Greg 2 ; Spector, Perry 2 ; Hillenbrand, Claus-Dieter 3 ; Buizert, Christo 4   VIAFID ORCID Logo  ; Ritz, Catherine 5   VIAFID ORCID Logo  ; Leduc-Leballeur, Marion 6   VIAFID ORCID Logo  ; Mulvaney, Robert 3   VIAFID ORCID Logo  ; Whitehouse, Pippa L 7   VIAFID ORCID Logo  ; Bentley, Michael J 7   VIAFID ORCID Logo  ; Bamber, Jonathan 8   VIAFID ORCID Logo 

 Department of Physics and Physical Oceanography, Memorial University, St. John's, Canada 
 Berkeley Geochronology Center, Berkeley, California, USA 
 British Antarctic Survey, Cambridge, UK 
 College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis OR, USA 
 Université Grenoble Alpes, CNRS, IRD, IGE, Grenoble, France 
 Institute of Applied Physics National Research Council, Florence, Italy 
 Department of Geography, Durham University, Durham, UK 
 Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, UK; Department of Aerospace and Geodesy, Data Science in Earth Observation, Technical University of Munich, Munich, Germany 
Pages
3573-3596
Publication year
2023
Publication date
2023
Publisher
Copernicus GmbH
ISSN
18663508
e-ISSN
18663516
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2848128218
Copyright
© 2023. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.