Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS
In this study, we estimate the ice mass changes, the ice elevation changes and the vertical displacements in Antarctica based on analysis of multi-geodetic datasets that involve the satellite gravimetry (GRACE), the satellite altimetry (ICESat) and the global navigation satellite systems (GNSS). Acc...
Published in: | Contributions to Geophysics and Geodesy |
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Online Access: | http://hdl.handle.net/10397/82247 https://doi.org/10.2478/congeo-2019-0021 |
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ftpolyuhongkong:oai:ira.lib.polyu.edu.hk:10397/82247 2023-05-15T13:24:18+02:00 Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS Zou, F Tenzer, R Rathnayake, S 2019 http://hdl.handle.net/10397/82247 https://doi.org/10.2478/congeo-2019-0021 en eng Sciendo Contributions to geophysics and geodesy Contributions to geophysics and geodesy, 21 Dec. 2019, v. 49, no. 4, p. 403-424 http://hdl.handle.net/10397/82247 403 424 49 4 doi:10.2478/congeo-2019-0021 WOS:000504040100002 2-s2.0-85078356923 1338-0540 Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported (CC BY-NC-ND 3.0), https://creativecommons.org/licenses/by-nc-nd/3.0/ The following publication Zou, F., Tenzer, R., & Rathnayake, S. (2019). Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS, Contributions to Geophysics and Geodesy, 49(4), 403-424 is available at https://dx.doi.org/10.2478/congeo-2019-0021 CC-BY-NC-ND Antarctica Ice sheet Glacier Grace Icesat Journal/Magazine Article 2019 ftpolyuhongkong https://doi.org/10.2478/congeo-2019-0021 2020-06-19T00:01:22Z In this study, we estimate the ice mass changes, the ice elevation changes and the vertical displacements in Antarctica based on analysis of multi-geodetic datasets that involve the satellite gravimetry (GRACE), the satellite altimetry (ICESat) and the global navigation satellite systems (GNSS). According to our estimates, the total mass change of the Antarctic ice sheet from GRACE data is -162.91 Gt/yr over the investigated period between April 2002 and June 2017. This value was obtained after applying the GIA correction of -98.12 Gt/yr derived from the ICE-5G model of the glacial isostatic adjustment. A more detailed analysis of mass balance changes for three individual drainage regions in Antarctica reveal that the mass loss of the West Antarctic ice sheet was at a rate of - 143.11 Gt/yr. The mass loss of the Antarctic Peninsula ice sheet was at a rate of -24.31 Gt/yr. The mass of the East Antarctic ice sheet increased at a rate of 5.29 Gt/yr during the investigated period. When integrated over the entire Antarctic ice sheet, average rates of ice elevation changes over the period from March 2003 to October 2009 derived from ICESat data represent the loss of total ice volume of -155.6 km(3). The most prominent features in ice volume changes in Antarctica are characterized by a strong dynamic thinning and ice mass loss in the Amundsen Sea Embayment that is part of the West Antarctic ice sheet. In contrast, coastal regions between Dronning Maud Land and Enderby Land exhibit a minor ice increase, while a minor ice mass loss is observed in Wilkes Land. The vertical load displacement rates estimated from GRACE and GPS data relatively closely agree with the GIA model derived based on the ice-load history and the viscosity profile. For most sites, the GRACE signal appears to be in phase and has the same amplitude as that obtained from the GPS vertical motions while other sites exhibit some substantial differences possibly attributed to thermo-elastic deformations associated with surface temperature. Department of Land Surveying and Geo-Informatics 202006 bcrc published_final Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land Enderby Land Ice Sheet Wilkes Land Hong Kong Polytechnic University: PolyU Institutional Repository (PolyU IR) Amundsen Sea Antarctic Antarctic Peninsula Dronning Maud Land East Antarctic Ice Sheet The Antarctic West Antarctic Ice Sheet Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Contributions to Geophysics and Geodesy 49 4 403 424 |
institution |
Open Polar |
collection |
Hong Kong Polytechnic University: PolyU Institutional Repository (PolyU IR) |
op_collection_id |
ftpolyuhongkong |
language |
English |
topic |
Antarctica Ice sheet Glacier Grace Icesat |
spellingShingle |
Antarctica Ice sheet Glacier Grace Icesat Zou, F Tenzer, R Rathnayake, S Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS |
topic_facet |
Antarctica Ice sheet Glacier Grace Icesat |
description |
In this study, we estimate the ice mass changes, the ice elevation changes and the vertical displacements in Antarctica based on analysis of multi-geodetic datasets that involve the satellite gravimetry (GRACE), the satellite altimetry (ICESat) and the global navigation satellite systems (GNSS). According to our estimates, the total mass change of the Antarctic ice sheet from GRACE data is -162.91 Gt/yr over the investigated period between April 2002 and June 2017. This value was obtained after applying the GIA correction of -98.12 Gt/yr derived from the ICE-5G model of the glacial isostatic adjustment. A more detailed analysis of mass balance changes for three individual drainage regions in Antarctica reveal that the mass loss of the West Antarctic ice sheet was at a rate of - 143.11 Gt/yr. The mass loss of the Antarctic Peninsula ice sheet was at a rate of -24.31 Gt/yr. The mass of the East Antarctic ice sheet increased at a rate of 5.29 Gt/yr during the investigated period. When integrated over the entire Antarctic ice sheet, average rates of ice elevation changes over the period from March 2003 to October 2009 derived from ICESat data represent the loss of total ice volume of -155.6 km(3). The most prominent features in ice volume changes in Antarctica are characterized by a strong dynamic thinning and ice mass loss in the Amundsen Sea Embayment that is part of the West Antarctic ice sheet. In contrast, coastal regions between Dronning Maud Land and Enderby Land exhibit a minor ice increase, while a minor ice mass loss is observed in Wilkes Land. The vertical load displacement rates estimated from GRACE and GPS data relatively closely agree with the GIA model derived based on the ice-load history and the viscosity profile. For most sites, the GRACE signal appears to be in phase and has the same amplitude as that obtained from the GPS vertical motions while other sites exhibit some substantial differences possibly attributed to thermo-elastic deformations associated with surface temperature. Department of Land Surveying and Geo-Informatics 202006 bcrc published_final |
format |
Article in Journal/Newspaper |
author |
Zou, F Tenzer, R Rathnayake, S |
author_facet |
Zou, F Tenzer, R Rathnayake, S |
author_sort |
Zou, F |
title |
Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS |
title_short |
Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS |
title_full |
Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS |
title_fullStr |
Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS |
title_full_unstemmed |
Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS |
title_sort |
monitoring changes of the antarctic ice sheet by grace, icesat and gnss |
publisher |
Sciendo |
publishDate |
2019 |
url |
http://hdl.handle.net/10397/82247 https://doi.org/10.2478/congeo-2019-0021 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Amundsen Sea Antarctic Antarctic Peninsula Dronning Maud Land East Antarctic Ice Sheet The Antarctic West Antarctic Ice Sheet Wilkes Land |
geographic_facet |
Amundsen Sea Antarctic Antarctic Peninsula Dronning Maud Land East Antarctic Ice Sheet The Antarctic West Antarctic Ice Sheet Wilkes Land |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land Enderby Land Ice Sheet Wilkes Land |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land Enderby Land Ice Sheet Wilkes Land |
op_relation |
Contributions to geophysics and geodesy Contributions to geophysics and geodesy, 21 Dec. 2019, v. 49, no. 4, p. 403-424 http://hdl.handle.net/10397/82247 403 424 49 4 doi:10.2478/congeo-2019-0021 WOS:000504040100002 2-s2.0-85078356923 1338-0540 |
op_rights |
Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported (CC BY-NC-ND 3.0), https://creativecommons.org/licenses/by-nc-nd/3.0/ The following publication Zou, F., Tenzer, R., & Rathnayake, S. (2019). Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS, Contributions to Geophysics and Geodesy, 49(4), 403-424 is available at https://dx.doi.org/10.2478/congeo-2019-0021 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.2478/congeo-2019-0021 |
container_title |
Contributions to Geophysics and Geodesy |
container_volume |
49 |
container_issue |
4 |
container_start_page |
403 |
op_container_end_page |
424 |
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1766378576495509504 |