A method for separating Antarctic postglacial rebound and ice mass balance using future ICESat Geoscience Laser Altimeter System, Gravity Recovery and Climate Experiment, and GPS satellite data
Measurements of ice elevation from the Geoscience Laser Altimeter System (GLAS) aboard the Ice, Cloud, and Land Elevation Satellite can be combined with time-variable geoid measurements from the Gravity Recovery and Climate Experiment (GRACE) satellite mission to learn about ongoing changes in polar...
Published in: | Journal of Geophysical Research: Solid Earth |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
eScholarship, University of California
2002
|
Subjects: | |
Online Access: | http://www.escholarship.org/uc/item/6h1681ww |
id |
ftcdlib:qt6h1681ww |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:qt6h1681ww 2023-05-15T14:01:09+02:00 A method for separating Antarctic postglacial rebound and ice mass balance using future ICESat Geoscience Laser Altimeter System, Gravity Recovery and Climate Experiment, and GPS satellite data Velicogna, Isabella Wahr, John 2002-01-01 application/pdf http://www.escholarship.org/uc/item/6h1681ww english eng eScholarship, University of California qt6h1681ww http://www.escholarship.org/uc/item/6h1681ww Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Velicogna, Isabella; & Wahr, John. (2002). A method for separating Antarctic postglacial rebound and ice mass balance using future ICESat Geoscience Laser Altimeter System, Gravity Recovery and Climate Experiment, and GPS satellite data. Journal of Geophysical Research, 107(B10). doi:10.1029/2001JB000708. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/6h1681ww Physical Sciences and Mathematics GRACE Antarctica postglacial rebound ice mass imbalance altimeter GPS model fluctuations earth article 2002 ftcdlib https://doi.org/10.1029/2001JB000708 2016-04-02T18:26:39Z Measurements of ice elevation from the Geoscience Laser Altimeter System (GLAS) aboard the Ice, Cloud, and Land Elevation Satellite can be combined with time-variable geoid measurements from the Gravity Recovery and Climate Experiment (GRACE) satellite mission to learn about ongoing changes in polar ice mass and viscoelastic rebound of the lithosphere under the ice sheet. We estimate the accuracy in recovering the spatially varying ice mass trend and postglacial rebound signals for Antarctica, from combining 5 years of simulated GRACE and GLAS data. We obtain root-mean square accuracies of 5.3 and 19.9 mm yr−1 for postglacial rebound and ice mass trend, respectively, when smoothed over 250 km scales. The largest source of error in the combined signals is the effect of the unknown time-variable accumulation on the density of the ice column. To estimate this contribution and so obtain better estimates of ice mass trend and postglacial rebound, we add Global Positioning System (GPS) measurements of vertical velocities as additional constraints. Using an empirical relation between the errors in postglacial rebound and ice mass trend that result from the unknown density variation within the ice column, we are able to solve for all three unknowns in the problem: ice mass trend, postglacial rebound, and the snow compaction trend. The addition of a plausible distribution of GPS measurements reduces the errors in estimates of postglacial rebound and ice mass trend to 3.4 and 15.9 mm yr−1, respectively. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet University of California: eScholarship Antarctic Journal of Geophysical Research: Solid Earth 107 B10 ETG 20-1 ETG 20-11 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Physical Sciences and Mathematics GRACE Antarctica postglacial rebound ice mass imbalance altimeter GPS model fluctuations earth |
spellingShingle |
Physical Sciences and Mathematics GRACE Antarctica postglacial rebound ice mass imbalance altimeter GPS model fluctuations earth Velicogna, Isabella Wahr, John A method for separating Antarctic postglacial rebound and ice mass balance using future ICESat Geoscience Laser Altimeter System, Gravity Recovery and Climate Experiment, and GPS satellite data |
topic_facet |
Physical Sciences and Mathematics GRACE Antarctica postglacial rebound ice mass imbalance altimeter GPS model fluctuations earth |
description |
Measurements of ice elevation from the Geoscience Laser Altimeter System (GLAS) aboard the Ice, Cloud, and Land Elevation Satellite can be combined with time-variable geoid measurements from the Gravity Recovery and Climate Experiment (GRACE) satellite mission to learn about ongoing changes in polar ice mass and viscoelastic rebound of the lithosphere under the ice sheet. We estimate the accuracy in recovering the spatially varying ice mass trend and postglacial rebound signals for Antarctica, from combining 5 years of simulated GRACE and GLAS data. We obtain root-mean square accuracies of 5.3 and 19.9 mm yr−1 for postglacial rebound and ice mass trend, respectively, when smoothed over 250 km scales. The largest source of error in the combined signals is the effect of the unknown time-variable accumulation on the density of the ice column. To estimate this contribution and so obtain better estimates of ice mass trend and postglacial rebound, we add Global Positioning System (GPS) measurements of vertical velocities as additional constraints. Using an empirical relation between the errors in postglacial rebound and ice mass trend that result from the unknown density variation within the ice column, we are able to solve for all three unknowns in the problem: ice mass trend, postglacial rebound, and the snow compaction trend. The addition of a plausible distribution of GPS measurements reduces the errors in estimates of postglacial rebound and ice mass trend to 3.4 and 15.9 mm yr−1, respectively. |
format |
Article in Journal/Newspaper |
author |
Velicogna, Isabella Wahr, John |
author_facet |
Velicogna, Isabella Wahr, John |
author_sort |
Velicogna, Isabella |
title |
A method for separating Antarctic postglacial rebound and ice mass balance using future ICESat Geoscience Laser Altimeter System, Gravity Recovery and Climate Experiment, and GPS satellite data |
title_short |
A method for separating Antarctic postglacial rebound and ice mass balance using future ICESat Geoscience Laser Altimeter System, Gravity Recovery and Climate Experiment, and GPS satellite data |
title_full |
A method for separating Antarctic postglacial rebound and ice mass balance using future ICESat Geoscience Laser Altimeter System, Gravity Recovery and Climate Experiment, and GPS satellite data |
title_fullStr |
A method for separating Antarctic postglacial rebound and ice mass balance using future ICESat Geoscience Laser Altimeter System, Gravity Recovery and Climate Experiment, and GPS satellite data |
title_full_unstemmed |
A method for separating Antarctic postglacial rebound and ice mass balance using future ICESat Geoscience Laser Altimeter System, Gravity Recovery and Climate Experiment, and GPS satellite data |
title_sort |
method for separating antarctic postglacial rebound and ice mass balance using future icesat geoscience laser altimeter system, gravity recovery and climate experiment, and gps satellite data |
publisher |
eScholarship, University of California |
publishDate |
2002 |
url |
http://www.escholarship.org/uc/item/6h1681ww |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_source |
Velicogna, Isabella; & Wahr, John. (2002). A method for separating Antarctic postglacial rebound and ice mass balance using future ICESat Geoscience Laser Altimeter System, Gravity Recovery and Climate Experiment, and GPS satellite data. Journal of Geophysical Research, 107(B10). doi:10.1029/2001JB000708. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/6h1681ww |
op_relation |
qt6h1681ww http://www.escholarship.org/uc/item/6h1681ww |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2001JB000708 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
107 |
container_issue |
B10 |
container_start_page |
ETG 20-1 |
op_container_end_page |
ETG 20-11 |
_version_ |
1766270760089812992 |