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  A benchmark study for glacial isostatic adjustment codes

Spada, G., Barletta, V. R., Klemann, V., Riva, R. E. M., Martinec, Z., Gasperini, P., Lund, B., Wolf, D., Vermeersen, L. L. A., King, M. (2011): A benchmark study for glacial isostatic adjustment codes. - Geophysical Journal International, 185, 1, 106-132.
https://doi.org/10.1111/j.1365-246X.2011.04952.x

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 Creators:
Spada, G.1, Author
Barletta, V. R.1, Author
Klemann, Volker2, Author              
Riva, R. E. M.1, Author
Martinec, Z.1, Author
Gasperini, P.1, Author
Lund, B.1, Author
Wolf, D.1, Author
Vermeersen, L. L. A.1, Author
King, M.1, Author
Affiliations:
1External Organizations, ou_persistent22              
21.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146027              

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Free keywords: Numerical solutions; Sea level change; Dynamics of lithosphere and mantle; Dynamics: gravity and tectonics; Mechanics, theory and modelling; Rheology: mantle
 DDC: 550 - Earth sciences
 Abstract: The study of glacial isostatic adjustment (GIA) is gaining an increasingly important role within the geophysical community. Understanding the response of the Earth to loading is crucial in various contexts, ranging from the interpretation of modern satellite geodetic measurements (e.g. GRACE and GOCE) to the projections of future sea level trends in response to climate change. Modern modelling approaches to GIA are based on various techniques that range from purely analytical formulations to fully numerical methods. Despite various teams independently investigating GIA, we do not have a suitably large set of agreed numerical results through which the methods may be validated; a community benchmark data set would clearly be valuable. Following the example of the mantle convection community, here we present, for the first time, the results of a benchmark study of codes designed to model GIA. This has taken place within a collaboration facilitated through European Cooperation in Science and Technology (COST) Action ES0701. The approaches benchmarked are based on significantly different codes and different techniques. The test computations are based on models with spherical symmetry and Maxwell rheology and include inputs from different methods and solution techniques: viscoelastic normal modes, spectral-finite elements and finite elements. The tests involve the loading and tidal Love numbers and their relaxation spectra, the deformation and gravity variations driven by surface loads characterized by simple geometry and time history and the rotational fluctuations in response to glacial unloading. In spite of the significant differences in the numerical methods employed, the test computations show a satisfactory agreement between the results provided by the participants.

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 Dates: 2011
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: eDoc: 16798
GFZPOF: PT1 Planet Earth: Global Processes and Change
DOI: 10.1111/j.1365-246X.2011.04952.x
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Title: Geophysical Journal International
Source Genre: Journal, SCI, Scopus, ab 2024 OA-Gold
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Pages: - Volume / Issue: 185 (1) Sequence Number: - Start / End Page: 106 - 132 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals180