Towards the inversion of GRACE gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in North America and Greenland
We perform an inversion of gravity fields from the Gravity Recovery and Climate Experiment (GRACE) (August 2002 to August 2009) of four processing centres for glacial-isostatic adjustment (GIA) over North America and present-day ice-mass change in Alaska and Greenland. We apply a statistical filteri...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/19838/ https://doi.org/10.1016/j.jog.2012.03.004 |
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ftnerc:oai:nora.nerc.ac.uk:19838 2023-05-15T16:26:28+02:00 Towards the inversion of GRACE gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in North America and Greenland Sasgen, Ingo Klemann, Volker Martinec, Zdeněk 2012-09 http://nora.nerc.ac.uk/id/eprint/19838/ https://doi.org/10.1016/j.jog.2012.03.004 unknown Sasgen, Ingo; Klemann, Volker; Martinec, Zdeněk. 2012 Towards the inversion of GRACE gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in North America and Greenland. Journal of Geodynamics, 59-60. 49-63. https://doi.org/10.1016/j.jog.2012.03.004 <https://doi.org/10.1016/j.jog.2012.03.004> Marine Sciences Publication - Article PeerReviewed 2012 ftnerc https://doi.org/10.1016/j.jog.2012.03.004 2023-02-04T19:32:30Z We perform an inversion of gravity fields from the Gravity Recovery and Climate Experiment (GRACE) (August 2002 to August 2009) of four processing centres for glacial-isostatic adjustment (GIA) over North America and present-day ice-mass change in Alaska and Greenland. We apply a statistical filtering approach to reduce noise in the GRACE data by confining our investigations to GRACE coefficients containing a statistically significant linear trend. Selecting the subset of reliable coefficients in all GRACE time series (GFZ RL04, ITG 2010, JPL RL04 and CSR RL04) results in a non-isotropic smoothing of the GRACE gravity fields, which is effective in reducing the north-south oriented striping associated with correlated errors in GRACE coefficients. In a next step, forward models of GIA induced by the glacial history NAWI (Zweck and Huybrechts, 2005), as well as present-day ice mass changes in Greenland from ICESat (Sørensen et al., 2011) and Alaska from airborne laser altimetry (Arendt et al., 2002) are simultaneously adjusted in scale to minimize the misfit to the filtered GRACE trends. From the adjusted models, we derive the recent sea-level contributions for Greenland and Alaska (August 2002 to August 2009), and, interpret the residual misfit over the GIA-dominated region around the Hudson Bay, Canada, in terms of mantle viscosities beneath North America. Article in Journal/Newspaper Greenland Hudson Bay Alaska Natural Environment Research Council: NERC Open Research Archive Hudson Bay Canada Greenland Hudson Journal of Geodynamics 59-60 49 63 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences |
spellingShingle |
Marine Sciences Sasgen, Ingo Klemann, Volker Martinec, Zdeněk Towards the inversion of GRACE gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in North America and Greenland |
topic_facet |
Marine Sciences |
description |
We perform an inversion of gravity fields from the Gravity Recovery and Climate Experiment (GRACE) (August 2002 to August 2009) of four processing centres for glacial-isostatic adjustment (GIA) over North America and present-day ice-mass change in Alaska and Greenland. We apply a statistical filtering approach to reduce noise in the GRACE data by confining our investigations to GRACE coefficients containing a statistically significant linear trend. Selecting the subset of reliable coefficients in all GRACE time series (GFZ RL04, ITG 2010, JPL RL04 and CSR RL04) results in a non-isotropic smoothing of the GRACE gravity fields, which is effective in reducing the north-south oriented striping associated with correlated errors in GRACE coefficients. In a next step, forward models of GIA induced by the glacial history NAWI (Zweck and Huybrechts, 2005), as well as present-day ice mass changes in Greenland from ICESat (Sørensen et al., 2011) and Alaska from airborne laser altimetry (Arendt et al., 2002) are simultaneously adjusted in scale to minimize the misfit to the filtered GRACE trends. From the adjusted models, we derive the recent sea-level contributions for Greenland and Alaska (August 2002 to August 2009), and, interpret the residual misfit over the GIA-dominated region around the Hudson Bay, Canada, in terms of mantle viscosities beneath North America. |
format |
Article in Journal/Newspaper |
author |
Sasgen, Ingo Klemann, Volker Martinec, Zdeněk |
author_facet |
Sasgen, Ingo Klemann, Volker Martinec, Zdeněk |
author_sort |
Sasgen, Ingo |
title |
Towards the inversion of GRACE gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in North America and Greenland |
title_short |
Towards the inversion of GRACE gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in North America and Greenland |
title_full |
Towards the inversion of GRACE gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in North America and Greenland |
title_fullStr |
Towards the inversion of GRACE gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in North America and Greenland |
title_full_unstemmed |
Towards the inversion of GRACE gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in North America and Greenland |
title_sort |
towards the inversion of grace gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in north america and greenland |
publishDate |
2012 |
url |
http://nora.nerc.ac.uk/id/eprint/19838/ https://doi.org/10.1016/j.jog.2012.03.004 |
geographic |
Hudson Bay Canada Greenland Hudson |
geographic_facet |
Hudson Bay Canada Greenland Hudson |
genre |
Greenland Hudson Bay Alaska |
genre_facet |
Greenland Hudson Bay Alaska |
op_relation |
Sasgen, Ingo; Klemann, Volker; Martinec, Zdeněk. 2012 Towards the inversion of GRACE gravity fields for present-day ice-mass changes and glacial-isostatic adjustment in North America and Greenland. Journal of Geodynamics, 59-60. 49-63. https://doi.org/10.1016/j.jog.2012.03.004 <https://doi.org/10.1016/j.jog.2012.03.004> |
op_doi |
https://doi.org/10.1016/j.jog.2012.03.004 |
container_title |
Journal of Geodynamics |
container_volume |
59-60 |
container_start_page |
49 |
op_container_end_page |
63 |
_version_ |
1766015385485705216 |