22 Dec 2022
22 Dec 2022
Status: this preprint is currently under review for the journal ESSD.

Antarctic ice sheet paleo-constraint database

Benoit S. Lecavalier1, Lev Tarasov1, Greg Balco2, Perry Spector2, Claus-Dieter Hillenbrand3, Christo Buizert4, Catherine Ritz5, Marion Leduc-Leballeur6, Robert Mulvaney3, Pippa L. Whitehouse7, Michael J. Bentley7, and Jonathan Bamber8,9 Benoit S. Lecavalier et al.
  • 1Department of Physics and Physical Oceanography, Memorial University, St. John’s, Canada
  • 2Berkeley Geochronology Center, Berkeley, California, USA
  • 3British Antarctic Survey, Cambridge, UK
  • 4College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis OR, USA
  • 5Université Grenoble Alpes, CNRS, IRD, IGE, Grenoble, France
  • 6Institute of Applied Physics National Research Council, Florence, Italy
  • 7Department of Geography, Durham University, Durham, UK
  • 8Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, UK
  • 9Department of Aerospace and Geodesy, Data Science in Earth Observation, Technical University of Munich, Munich, Germany

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, 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” 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 is 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.

Benoit S. Lecavalier et al.

Status: open (until 22 Feb 2023)

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Benoit S. Lecavalier et al.

Benoit S. Lecavalier et al.


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Short summary
The Antarctic ice sheet evolution constraint database version 2 (AntICE2) consists of a large variety of observations that constrain the evolution of the Antarctic ice sheet over the last glacial cycle. This includes observations of past ice sheet extent, past ice thickness, past relative sea level, borehole temperature profiles, and present-day bedrock displacement rates. The database is intended to improve our understanding of past Antarctic changes and for ice sheet model calibrations.