Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations

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Abstract

Constraining glacial isostatic adjustment (GIA) i.e. the Earth’s viscoelastic response to past ice changes, is an important task, because GIA is a significant correction in gravity-based ice sheet mass balance estimates. Here, we investigate how temporal variations in the observed and modeled crustal displacements due to the Earth’s response to ongoing ice mass changes can contribute to the process of constraining GIA. We use mass change grids of the Greenland ice sheet (GrIS) derived from NASA’s high resolution Ice, Cloud and land Elevation Satellite (ICESat) data in three overlapping time spans covering the period 2004–2009 to estimate temporal variations in the elastic response due to present day ice mass loss. The modeled crustal displacements (elastic + GIA) are compared with GPS time series from five permanent sites (KELY, KULU, QAQ1, THU2, and SCOR). We find, that the modeled pattern of elastic crustal displacements shows pronounced variation during the observation period, where an increase in elastic displacement is found at the northwest coast of Greenland, while a decrease is found at the southeast coast. This pattern of temporal changes is supported by the GPS observations. We find, that the temporal behavior of the ICESat-based modeled elastic response agrees well with the GPS observations at the sites KELY, QAQ1, and SCOR. This suggests, that our elastic models are able to resolve the temporal changes in the observed uplift, which indicates that the elastic uplift models are reliable at these sites. Therefore, we conclude that these sites are useful for constraining GIA.
Original languageEnglish
Title of host publicationEarth on the Edge: Science for a Sustainable Planet
EditorsC. Rizos, P. Willis
Number of pages7
PublisherSpringer
Publication date2014
Pages325-331
ISBN (Print)978-3-642-37221-6
ISBN (Electronic)978-3-642-37222-3
Publication statusPublished - 2014
Event2011 IAG General Assembly - Melbourne Convention and Exhibition Centre, Melbourne, Australia
Duration: 28 Jun 20117 Jul 2011

Conference

Conference2011 IAG General Assembly
LocationMelbourne Convention and Exhibition Centre
CountryAustralia
CityMelbourne
Period28/06/201107/07/2011
SeriesInternational Association of Geodesy Symposia
Volume139
ISSN0939-9585

Cite this

Nielsen, K., Sørensen, L. S., Khan, S. A., Spada, G., Simonsen, S. B., & Forsberg, R. (2014). Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations. In C. Rizos, & P. Willis (Eds.), Earth on the Edge: Science for a Sustainable Planet (pp. 325-331). Springer. International Association of Geodesy Symposia, Vol.. 139
Nielsen, Karina ; Sørensen, Louise Sandberg ; Khan, Shfaqat Abbas ; Spada, Giorgio ; Simonsen, Sebastian Bjerregaard ; Forsberg, René. / Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations. Earth on the Edge: Science for a Sustainable Planet. editor / C. Rizos ; P. Willis. Springer, 2014. pp. 325-331 (International Association of Geodesy Symposia, Vol. 139).
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abstract = "Constraining glacial isostatic adjustment (GIA) i.e. the Earth’s viscoelastic response to past ice changes, is an important task, because GIA is a significant correction in gravity-based ice sheet mass balance estimates. Here, we investigate how temporal variations in the observed and modeled crustal displacements due to the Earth’s response to ongoing ice mass changes can contribute to the process of constraining GIA. We use mass change grids of the Greenland ice sheet (GrIS) derived from NASA’s high resolution Ice, Cloud and land Elevation Satellite (ICESat) data in three overlapping time spans covering the period 2004–2009 to estimate temporal variations in the elastic response due to present day ice mass loss. The modeled crustal displacements (elastic + GIA) are compared with GPS time series from five permanent sites (KELY, KULU, QAQ1, THU2, and SCOR). We find, that the modeled pattern of elastic crustal displacements shows pronounced variation during the observation period, where an increase in elastic displacement is found at the northwest coast of Greenland, while a decrease is found at the southeast coast. This pattern of temporal changes is supported by the GPS observations. We find, that the temporal behavior of the ICESat-based modeled elastic response agrees well with the GPS observations at the sites KELY, QAQ1, and SCOR. This suggests, that our elastic models are able to resolve the temporal changes in the observed uplift, which indicates that the elastic uplift models are reliable at these sites. Therefore, we conclude that these sites are useful for constraining GIA.",
author = "Karina Nielsen and S{\o}rensen, {Louise Sandberg} and Khan, {Shfaqat Abbas} and Giorgio Spada and Simonsen, {Sebastian Bjerregaard} and Ren{\'e} Forsberg",
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Nielsen, K, Sørensen, LS, Khan, SA, Spada, G, Simonsen, SB & Forsberg, R 2014, Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations. in C Rizos & P Willis (eds), Earth on the Edge: Science for a Sustainable Planet. Springer, International Association of Geodesy Symposia, vol. 139, pp. 325-331, 2011 IAG General Assembly, Melbourne, Australia, 28/06/2011.

Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations. / Nielsen, Karina; Sørensen, Louise Sandberg; Khan, Shfaqat Abbas; Spada, Giorgio; Simonsen, Sebastian Bjerregaard; Forsberg, René.

Earth on the Edge: Science for a Sustainable Planet. ed. / C. Rizos; P. Willis. Springer, 2014. p. 325-331 (International Association of Geodesy Symposia, Vol. 139).

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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AU - Simonsen, Sebastian Bjerregaard

AU - Forsberg, René

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N2 - Constraining glacial isostatic adjustment (GIA) i.e. the Earth’s viscoelastic response to past ice changes, is an important task, because GIA is a significant correction in gravity-based ice sheet mass balance estimates. Here, we investigate how temporal variations in the observed and modeled crustal displacements due to the Earth’s response to ongoing ice mass changes can contribute to the process of constraining GIA. We use mass change grids of the Greenland ice sheet (GrIS) derived from NASA’s high resolution Ice, Cloud and land Elevation Satellite (ICESat) data in three overlapping time spans covering the period 2004–2009 to estimate temporal variations in the elastic response due to present day ice mass loss. The modeled crustal displacements (elastic + GIA) are compared with GPS time series from five permanent sites (KELY, KULU, QAQ1, THU2, and SCOR). We find, that the modeled pattern of elastic crustal displacements shows pronounced variation during the observation period, where an increase in elastic displacement is found at the northwest coast of Greenland, while a decrease is found at the southeast coast. This pattern of temporal changes is supported by the GPS observations. We find, that the temporal behavior of the ICESat-based modeled elastic response agrees well with the GPS observations at the sites KELY, QAQ1, and SCOR. This suggests, that our elastic models are able to resolve the temporal changes in the observed uplift, which indicates that the elastic uplift models are reliable at these sites. Therefore, we conclude that these sites are useful for constraining GIA.

AB - Constraining glacial isostatic adjustment (GIA) i.e. the Earth’s viscoelastic response to past ice changes, is an important task, because GIA is a significant correction in gravity-based ice sheet mass balance estimates. Here, we investigate how temporal variations in the observed and modeled crustal displacements due to the Earth’s response to ongoing ice mass changes can contribute to the process of constraining GIA. We use mass change grids of the Greenland ice sheet (GrIS) derived from NASA’s high resolution Ice, Cloud and land Elevation Satellite (ICESat) data in three overlapping time spans covering the period 2004–2009 to estimate temporal variations in the elastic response due to present day ice mass loss. The modeled crustal displacements (elastic + GIA) are compared with GPS time series from five permanent sites (KELY, KULU, QAQ1, THU2, and SCOR). We find, that the modeled pattern of elastic crustal displacements shows pronounced variation during the observation period, where an increase in elastic displacement is found at the northwest coast of Greenland, while a decrease is found at the southeast coast. This pattern of temporal changes is supported by the GPS observations. We find, that the temporal behavior of the ICESat-based modeled elastic response agrees well with the GPS observations at the sites KELY, QAQ1, and SCOR. This suggests, that our elastic models are able to resolve the temporal changes in the observed uplift, which indicates that the elastic uplift models are reliable at these sites. Therefore, we conclude that these sites are useful for constraining GIA.

M3 - Article in proceedings

SN - 978-3-642-37221-6

SP - 325

EP - 331

BT - Earth on the Edge: Science for a Sustainable Planet

A2 - Rizos, C.

A2 - Willis, P.

PB - Springer

ER -

Nielsen K, Sørensen LS, Khan SA, Spada G, Simonsen SB, Forsberg R. Towards Constraining Glacial Isostatic Adjustment in Greenland Using ICESat and GPS Observations. In Rizos C, Willis P, editors, Earth on the Edge: Science for a Sustainable Planet. Springer. 2014. p. 325-331. (International Association of Geodesy Symposia, Vol. 139).