Ice age effects on the satellite-derived J˙2 datum: Mapping the sensitivity to 3D variations in mantle viscosity ...
Studies of glacial isostatic adjustment (GIA) based on spherically symmetric viscoelastic Earth models have argued that the rate of change of the degree 2 zonal harmonic of the Earth’s geopotential, or J˙2, provides an important constraint on mean viscosity in the deep mantle (Mitrovica and Peltier,...
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Online Access: | https://dx.doi.org/10.17863/cam.80177 https://www.repository.cam.ac.uk/handle/1810/332736 |
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ftdatacite:10.17863/cam.80177 2024-02-04T10:01:17+01:00 Ice age effects on the satellite-derived J˙2 datum: Mapping the sensitivity to 3D variations in mantle viscosity ... Kim, AJ Crawford, O Al-Attar, D Lau, HCP Mitrovica, JX Latychev, K 2022 https://dx.doi.org/10.17863/cam.80177 https://www.repository.cam.ac.uk/handle/1810/332736 en eng Elsevier BV open.access Creative Commons Attribution Non Commercial No Derivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode cc-by-nc-nd-4.0 http://purl.org/coar/access_right/c_abf2 satellite geodesy glacial isostatic adjustment 3D mantle viscosity long wavelength geopotential adjoint method sensitivity kernels Article ScholarlyArticle JournalArticle article-journal 2022 ftdatacite https://doi.org/10.17863/cam.80177 2024-01-05T09:28:50Z Studies of glacial isostatic adjustment (GIA) based on spherically symmetric viscoelastic Earth models have argued that the rate of change of the degree 2 zonal harmonic of the Earth’s geopotential, or J˙2, provides an important constraint on mean viscosity in the deep mantle (Mitrovica and Peltier, 1993; Nakada et al., 2015; Lau et al., 2016). To refine this constraint, we compute Fr´echet kernels using an adjoint methodology that reveal the sensitivity of the datum to 3D variations in mantle viscosity. We demonstrate that the mantle sensitivity of the datum is largely limited to the region below the ancient Laurentide ice sheet that covered Canada and significant portions of the northeastern United States at Last Glacial Maximum (LGM). In the bottom half of the lower mantle, this region of maximum sensitivity lies outside the location of Large Low Shear Velocity Provinces (LLSVPs) imaged from seismic tomographic studies. Thus, if the low shear velocity of these provinces originates from thermal effects, ... Article in Journal/Newspaper Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Canada Peltier ENVELOPE(-63.495,-63.495,-64.854,-64.854) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
satellite geodesy glacial isostatic adjustment 3D mantle viscosity long wavelength geopotential adjoint method sensitivity kernels |
spellingShingle |
satellite geodesy glacial isostatic adjustment 3D mantle viscosity long wavelength geopotential adjoint method sensitivity kernels Kim, AJ Crawford, O Al-Attar, D Lau, HCP Mitrovica, JX Latychev, K Ice age effects on the satellite-derived J˙2 datum: Mapping the sensitivity to 3D variations in mantle viscosity ... |
topic_facet |
satellite geodesy glacial isostatic adjustment 3D mantle viscosity long wavelength geopotential adjoint method sensitivity kernels |
description |
Studies of glacial isostatic adjustment (GIA) based on spherically symmetric viscoelastic Earth models have argued that the rate of change of the degree 2 zonal harmonic of the Earth’s geopotential, or J˙2, provides an important constraint on mean viscosity in the deep mantle (Mitrovica and Peltier, 1993; Nakada et al., 2015; Lau et al., 2016). To refine this constraint, we compute Fr´echet kernels using an adjoint methodology that reveal the sensitivity of the datum to 3D variations in mantle viscosity. We demonstrate that the mantle sensitivity of the datum is largely limited to the region below the ancient Laurentide ice sheet that covered Canada and significant portions of the northeastern United States at Last Glacial Maximum (LGM). In the bottom half of the lower mantle, this region of maximum sensitivity lies outside the location of Large Low Shear Velocity Provinces (LLSVPs) imaged from seismic tomographic studies. Thus, if the low shear velocity of these provinces originates from thermal effects, ... |
format |
Article in Journal/Newspaper |
author |
Kim, AJ Crawford, O Al-Attar, D Lau, HCP Mitrovica, JX Latychev, K |
author_facet |
Kim, AJ Crawford, O Al-Attar, D Lau, HCP Mitrovica, JX Latychev, K |
author_sort |
Kim, AJ |
title |
Ice age effects on the satellite-derived J˙2 datum: Mapping the sensitivity to 3D variations in mantle viscosity ... |
title_short |
Ice age effects on the satellite-derived J˙2 datum: Mapping the sensitivity to 3D variations in mantle viscosity ... |
title_full |
Ice age effects on the satellite-derived J˙2 datum: Mapping the sensitivity to 3D variations in mantle viscosity ... |
title_fullStr |
Ice age effects on the satellite-derived J˙2 datum: Mapping the sensitivity to 3D variations in mantle viscosity ... |
title_full_unstemmed |
Ice age effects on the satellite-derived J˙2 datum: Mapping the sensitivity to 3D variations in mantle viscosity ... |
title_sort |
ice age effects on the satellite-derived j˙2 datum: mapping the sensitivity to 3d variations in mantle viscosity ... |
publisher |
Elsevier BV |
publishDate |
2022 |
url |
https://dx.doi.org/10.17863/cam.80177 https://www.repository.cam.ac.uk/handle/1810/332736 |
long_lat |
ENVELOPE(-63.495,-63.495,-64.854,-64.854) |
geographic |
Canada Peltier |
geographic_facet |
Canada Peltier |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_rights |
open.access Creative Commons Attribution Non Commercial No Derivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode cc-by-nc-nd-4.0 http://purl.org/coar/access_right/c_abf2 |
op_doi |
https://doi.org/10.17863/cam.80177 |
_version_ |
1789967039310331904 |