Altimetry, gravimetry, GPS and viscoelastic modeling data for the joint inversion for glacial isostatic adjustment in Antarctica (ESA STSE Project REGINA)

Earth System Science Data - Tập 10 Số 1 - Trang 493-523
Ingo Sasgen1, Alba Martín‐Español2, Alexander Horvath3, Volker Klemann4, Elizabeth Petrie5, Bert Wouters6, Martin Horwath7, Roland Pail3, J. L. Bamber2, Peter J. Clarke8, Hannes Konrad1,9, T. J. Wilson10, Mark R. Drinkwater11
1Division of Climate Sciences, Alfred Wegener Institute, Bussestraße 24, 27570 Bremerhaven, Germany
2School of Geographical Sciences, University of Bristol, University Road, Clifton, Bristol BS8 1SS, UK
3Institut für Astronomische und Physikalische Geodäsie, Technische Universität München, Arcisstraße 21, 80333 München, Germany
4Department of Geodesy, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
5School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
6Institute for Marine and Atmospheric Research, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
7Institut für Planetare Geodäsie, Technische Universität Dresden, Helmholtzstr. 10, 01069 Dresden, Germany
8School of Civil Engineering and Geosciences, Newcastle University, Newcastle NE1 7RU, UK
9School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
10School of Earth Science, Ohio State University, 275 Mendenhall Lab, 125 South Oval Mall, Columbus, OH 43210, USA
11Mission Science Division, European Space Agency, European Space Research and Technology Centre, Keplerlaan 1, Noordwijk 2201 AZ, The Netherlands

Tóm tắt

Abstract. The poorly known correction for the ongoing deformation of the solid Earth caused by glacial isostatic adjustment (GIA) is a major uncertainty in determining the mass balance of the Antarctic ice sheet from measurements of satellite gravimetry and to a lesser extent satellite altimetry. In the past decade, much progress has been made in consistently modeling ice sheet and solid Earth interactions; however, forward-modeling solutions of GIA in Antarctica remain uncertain due to the sparsity of constraints on the ice sheet evolution, as well as the Earth's rheological properties. An alternative approach towards estimating GIA is the joint inversion of multiple satellite data – namely, satellite gravimetry, satellite altimetry and GPS, which reflect, with different sensitivities, trends in recent glacial changes and GIA. Crucial to the success of this approach is the accuracy of the space-geodetic data sets. Here, we present reprocessed rates of surface-ice elevation change (Envisat/Ice, Cloud,and land Elevation Satellite, ICESat; 2003–2009), gravity field change (Gravity Recovery and Climate Experiment, GRACE; 2003–2009) and bedrock uplift (GPS; 1995–2013). The data analysis is complemented by the forward modeling of viscoelastic response functions to disc load forcing, allowing us to relate GIA-induced surface displacements with gravity changes for different rheological parameters of the solid Earth. The data and modeling results presented here are available in the PANGAEA database (https://doi.org/10.1594/PANGAEA.875745). The data sets are the input streams for the joint inversion estimate of present-day ice-mass change and GIA, focusing on Antarctica. However, the methods, code and data provided in this paper can be used to solve other problems, such as volume balances of the Antarctic ice sheet, or can be applied to other geographical regions in the case of the viscoelastic response functions. This paper presents the first of two contributions summarizing the work carried out within a European Space Agency funded study: Regional glacial isostatic adjustment and CryoSat elevation rate corrections in Antarctica (REGINA).

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