Glacial isostatic adjustment on a rotating earth
We extend and complete previous work to compute the influence of perturbations to the rotation vector on a suite. of observables associated with glacial isostatic adjustment (GIA). We emphasize observables relevant to present and future geodetic missions (for example, present-day 3-D crustal motions...
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ftharvardudash:oai:dash.harvard.edu:1/41401414 2023-05-15T16:30:08+02:00 Glacial isostatic adjustment on a rotating earth Mitrovica, Jerry Milne, Glenn A. Davis, James L. 2001 application/pdf http://nrs.harvard.edu/urn-3:HUL.InstRepos:41401414 https://doi.org/10.1046/j.1365-246x.2001.01550.x en_US eng Geophysical Journal of the RAS, DGG and EGS Mitrovica, Jerry X., Glenn A. Milne, and James L. Davis. 2001. “Glacial Isostatic Adjustment on a Rotating Earth.” Geophysical Journal International 147 (3): 562–78. https://doi.org/10.1046/j.1365-246x.2001.01550.x. 0952-4592 http://nrs.harvard.edu/urn-3:HUL.InstRepos:41401414 doi:10.1046/j.1365-246x.2001.01550.x Journal Article 2001 ftharvardudash https://doi.org/10.1046/j.1365-246x.2001.01550.x 2022-04-04T11:36:09Z We extend and complete previous work to compute the influence of perturbations to the rotation vector on a suite. of observables associated with glacial isostatic adjustment (GIA). We emphasize observables relevant to present and future geodetic missions (for example, present-day 3-D crustal motions, relative sea-level change and geoid or absolute sea-level variations). Our calculations adopt spherically symmetric, self-gravitating, Maxwell viscoelastic earth models while incorporating realistic mass (ice plus ocean) load and rotation variations. The predicted rotation-induced signals are dominated by the influence of true polar wander (TPW). The spatial geometry of the TPW-induced relative sea level, geoid and radial velocity fields is primarily that of a degree two, order one surface spherical harmonic. The spatial variation of the horizontal velocity vectors is given by the gradient of this harmonic. The peak radial and horizontal velocities are of the order of 0.5 mm yr(-1). however, we show that this value is sensitive to the adopted profile of mantle viscosity. We also demonstrate that an accurate prediction of TPW-induced sea level and 3-D crustal deformation rates requires that a realistic number of glacial cycles be incorporated into the ice load history. We conclude that geodetic observations of the GIA process should be analysed using a GIA theory valid for a rotating planet. Finally, we also consider variations in rotation driven by simple present-day polar melting scenarios and predict the influence of these variations on a suite of geophysical observables. We find that the rotational feedback associated with Greenland melting is capable of significantly perturbing both relative and absolute sea-level variations. Version of Record Article in Journal/Newspaper Greenland Harvard University: DASH - Digital Access to Scholarship at Harvard Greenland Geophysical Journal International 147 3 562 578 |
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Open Polar |
collection |
Harvard University: DASH - Digital Access to Scholarship at Harvard |
op_collection_id |
ftharvardudash |
language |
English |
description |
We extend and complete previous work to compute the influence of perturbations to the rotation vector on a suite. of observables associated with glacial isostatic adjustment (GIA). We emphasize observables relevant to present and future geodetic missions (for example, present-day 3-D crustal motions, relative sea-level change and geoid or absolute sea-level variations). Our calculations adopt spherically symmetric, self-gravitating, Maxwell viscoelastic earth models while incorporating realistic mass (ice plus ocean) load and rotation variations. The predicted rotation-induced signals are dominated by the influence of true polar wander (TPW). The spatial geometry of the TPW-induced relative sea level, geoid and radial velocity fields is primarily that of a degree two, order one surface spherical harmonic. The spatial variation of the horizontal velocity vectors is given by the gradient of this harmonic. The peak radial and horizontal velocities are of the order of 0.5 mm yr(-1). however, we show that this value is sensitive to the adopted profile of mantle viscosity. We also demonstrate that an accurate prediction of TPW-induced sea level and 3-D crustal deformation rates requires that a realistic number of glacial cycles be incorporated into the ice load history. We conclude that geodetic observations of the GIA process should be analysed using a GIA theory valid for a rotating planet. Finally, we also consider variations in rotation driven by simple present-day polar melting scenarios and predict the influence of these variations on a suite of geophysical observables. We find that the rotational feedback associated with Greenland melting is capable of significantly perturbing both relative and absolute sea-level variations. Version of Record |
format |
Article in Journal/Newspaper |
author |
Mitrovica, Jerry Milne, Glenn A. Davis, James L. |
spellingShingle |
Mitrovica, Jerry Milne, Glenn A. Davis, James L. Glacial isostatic adjustment on a rotating earth |
author_facet |
Mitrovica, Jerry Milne, Glenn A. Davis, James L. |
author_sort |
Mitrovica, Jerry |
title |
Glacial isostatic adjustment on a rotating earth |
title_short |
Glacial isostatic adjustment on a rotating earth |
title_full |
Glacial isostatic adjustment on a rotating earth |
title_fullStr |
Glacial isostatic adjustment on a rotating earth |
title_full_unstemmed |
Glacial isostatic adjustment on a rotating earth |
title_sort |
glacial isostatic adjustment on a rotating earth |
publishDate |
2001 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:41401414 https://doi.org/10.1046/j.1365-246x.2001.01550.x |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
Geophysical Journal of the RAS, DGG and EGS Mitrovica, Jerry X., Glenn A. Milne, and James L. Davis. 2001. “Glacial Isostatic Adjustment on a Rotating Earth.” Geophysical Journal International 147 (3): 562–78. https://doi.org/10.1046/j.1365-246x.2001.01550.x. 0952-4592 http://nrs.harvard.edu/urn-3:HUL.InstRepos:41401414 doi:10.1046/j.1365-246x.2001.01550.x |
op_doi |
https://doi.org/10.1046/j.1365-246x.2001.01550.x |
container_title |
Geophysical Journal International |
container_volume |
147 |
container_issue |
3 |
container_start_page |
562 |
op_container_end_page |
578 |
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1766019850989207552 |