Shallow upper mantle rheology and secular ice sheets fluctuations
On time scales from decades to centuries, continental cryospheric forcing in response to climate change constitutes a major source of isostatic disequilibrium that may influence future regional sea level variations. Current vertical displacements and gravity field variations are often estimated negl...
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Online Access: | http://hdl.handle.net/11576/2502440 https://doi.org/10.1016/j.tecto.2009.12.020 http://www.sciencedirect.com/science/article/pii/S0040195109007082 |
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ftunivurbino:oai:ora.uniurb.it:11576/2502440 2024-04-14T08:13:11+00:00 Shallow upper mantle rheology and secular ice sheets fluctuations SPADA, GIORGIO COLLEONI F RUGGIERI G. Spada, Giorgio Colleoni, F Ruggieri, G. 2011 STAMPA http://hdl.handle.net/11576/2502440 https://doi.org/10.1016/j.tecto.2009.12.020 http://www.sciencedirect.com/science/article/pii/S0040195109007082 eng eng Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598 info:eu-repo/semantics/altIdentifier/wos/WOS:000298517900004 volume:511 issue:3-4 firstpage:89 lastpage:98 numberofpages:10 journal:TECTONOPHYSICS http://hdl.handle.net/11576/2502440 doi:10.1016/j.tecto.2009.12.020 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-82655166431 http://www.sciencedirect.com/science/article/pii/S0040195109007082 Glacial isostasy Glaciers and ice sheet Generalized Maxwell rheology info:eu-repo/semantics/article 2011 ftunivurbino https://doi.org/10.1016/j.tecto.2009.12.020 2024-03-21T17:08:45Z On time scales from decades to centuries, continental cryospheric forcing in response to climate change constitutes a major source of isostatic disequilibrium that may influence future regional sea level variations. Current vertical displacements and gravity field variations are often estimated neglecting rheological effects and thus assuming a fully elastic response of the Earth. In this study, we adopt a more general point of view, aiming at describing ongoing surface movements resulting from recent glacial instabilities, also taking into account the effects associated with shallow upper mantle and crustal rheologies. Our computations are based on the Post–Widder Laplace inversion formula, which permits the straightforward computation of load-deformation coefficients for steady state and transient rheologies up to very high harmonic degrees. Using a surface load with a simple geometry and time history, we compare the classical elastic solutions to those obtained considering the rheological response of the shallow upper mantle. While at the center of the ice sheet rheology only magnifies the elastic response, the pattern and time history of vertical displacement at the ice sheet margins show a greater complexity, mainly due to the development of lateral forebulges whose shape and amplitude are particularly sensitive to the rheology of the shallow upper mantle. In this region, assuming an elastic rheology is generally appropriate on a century time scale, but significant deviations from a purely elastic response (both sign and amplitude) are observed at longer time scales or when a low viscosity zone with Maxwell rheology is taken into account. Article in Journal/Newspaper Ice Sheet Università degli Studi di Urbino: CINECA IRIS Laplace ENVELOPE(141.467,141.467,-66.782,-66.782) Tectonophysics 511 3-4 89 98 |
institution |
Open Polar |
collection |
Università degli Studi di Urbino: CINECA IRIS |
op_collection_id |
ftunivurbino |
language |
English |
topic |
Glacial isostasy Glaciers and ice sheet Generalized Maxwell rheology |
spellingShingle |
Glacial isostasy Glaciers and ice sheet Generalized Maxwell rheology SPADA, GIORGIO COLLEONI F RUGGIERI G. Shallow upper mantle rheology and secular ice sheets fluctuations |
topic_facet |
Glacial isostasy Glaciers and ice sheet Generalized Maxwell rheology |
description |
On time scales from decades to centuries, continental cryospheric forcing in response to climate change constitutes a major source of isostatic disequilibrium that may influence future regional sea level variations. Current vertical displacements and gravity field variations are often estimated neglecting rheological effects and thus assuming a fully elastic response of the Earth. In this study, we adopt a more general point of view, aiming at describing ongoing surface movements resulting from recent glacial instabilities, also taking into account the effects associated with shallow upper mantle and crustal rheologies. Our computations are based on the Post–Widder Laplace inversion formula, which permits the straightforward computation of load-deformation coefficients for steady state and transient rheologies up to very high harmonic degrees. Using a surface load with a simple geometry and time history, we compare the classical elastic solutions to those obtained considering the rheological response of the shallow upper mantle. While at the center of the ice sheet rheology only magnifies the elastic response, the pattern and time history of vertical displacement at the ice sheet margins show a greater complexity, mainly due to the development of lateral forebulges whose shape and amplitude are particularly sensitive to the rheology of the shallow upper mantle. In this region, assuming an elastic rheology is generally appropriate on a century time scale, but significant deviations from a purely elastic response (both sign and amplitude) are observed at longer time scales or when a low viscosity zone with Maxwell rheology is taken into account. |
author2 |
Spada, Giorgio Colleoni, F Ruggieri, G. |
format |
Article in Journal/Newspaper |
author |
SPADA, GIORGIO COLLEONI F RUGGIERI G. |
author_facet |
SPADA, GIORGIO COLLEONI F RUGGIERI G. |
author_sort |
SPADA, GIORGIO |
title |
Shallow upper mantle rheology and secular ice sheets fluctuations |
title_short |
Shallow upper mantle rheology and secular ice sheets fluctuations |
title_full |
Shallow upper mantle rheology and secular ice sheets fluctuations |
title_fullStr |
Shallow upper mantle rheology and secular ice sheets fluctuations |
title_full_unstemmed |
Shallow upper mantle rheology and secular ice sheets fluctuations |
title_sort |
shallow upper mantle rheology and secular ice sheets fluctuations |
publisher |
Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598 |
publishDate |
2011 |
url |
http://hdl.handle.net/11576/2502440 https://doi.org/10.1016/j.tecto.2009.12.020 http://www.sciencedirect.com/science/article/pii/S0040195109007082 |
long_lat |
ENVELOPE(141.467,141.467,-66.782,-66.782) |
geographic |
Laplace |
geographic_facet |
Laplace |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000298517900004 volume:511 issue:3-4 firstpage:89 lastpage:98 numberofpages:10 journal:TECTONOPHYSICS http://hdl.handle.net/11576/2502440 doi:10.1016/j.tecto.2009.12.020 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-82655166431 http://www.sciencedirect.com/science/article/pii/S0040195109007082 |
op_doi |
https://doi.org/10.1016/j.tecto.2009.12.020 |
container_title |
Tectonophysics |
container_volume |
511 |
container_issue |
3-4 |
container_start_page |
89 |
op_container_end_page |
98 |
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1796311108246568960 |