Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS
Abstract 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 (G...
Published in: | Contributions to Geophysics and Geodesy |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Walter de Gruyter GmbH
2019
|
Subjects: | |
Online Access: | http://dx.doi.org/10.2478/congeo-2019-0021 https://content.sciendo.com/view/journals/congeo/49/4/article-p403.xml https://journal.geo.sav.sk/cgg/article/download/213/205 |
id |
crdegruyter:10.2478/congeo-2019-0021 |
---|---|
record_format |
openpolar |
spelling |
crdegruyter:10.2478/congeo-2019-0021 2024-03-03T08:36:38+00:00 Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS Zou, Fang Tenzer, Robert Rathnayake, Samurdhika 2019 http://dx.doi.org/10.2478/congeo-2019-0021 https://content.sciendo.com/view/journals/congeo/49/4/article-p403.xml https://journal.geo.sav.sk/cgg/article/download/213/205 unknown Walter de Gruyter GmbH http://creativecommons.org/licenses/by-nc-nd/3.0 Contributions to Geophysics and Geodesy volume 49, issue 4, page 403-424 ISSN 1338-0540 Geophysics journal-article 2019 crdegruyter https://doi.org/10.2478/congeo-2019-0021 2024-02-05T10:20:56Z Abstract 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 iso-static 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. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land Enderby Land Ice Sheet Wilkes Land De Gruyter Antarctic The Antarctic Antarctic Peninsula Dronning Maud Land Amundsen Sea West Antarctic Ice Sheet East 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 |
De Gruyter |
op_collection_id |
crdegruyter |
language |
unknown |
topic |
Geophysics |
spellingShingle |
Geophysics Zou, Fang Tenzer, Robert Rathnayake, Samurdhika Monitoring changes of the Antarctic Ice sheet by GRACE, ICESat and GNSS |
topic_facet |
Geophysics |
description |
Abstract 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 iso-static 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. |
format |
Article in Journal/Newspaper |
author |
Zou, Fang Tenzer, Robert Rathnayake, Samurdhika |
author_facet |
Zou, Fang Tenzer, Robert Rathnayake, Samurdhika |
author_sort |
Zou, Fang |
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 |
Walter de Gruyter GmbH |
publishDate |
2019 |
url |
http://dx.doi.org/10.2478/congeo-2019-0021 https://content.sciendo.com/view/journals/congeo/49/4/article-p403.xml https://journal.geo.sav.sk/cgg/article/download/213/205 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Dronning Maud Land Amundsen Sea West Antarctic Ice Sheet East Antarctic Ice Sheet Wilkes Land |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Dronning Maud Land Amundsen Sea West Antarctic Ice Sheet East 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_source |
Contributions to Geophysics and Geodesy volume 49, issue 4, page 403-424 ISSN 1338-0540 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/3.0 |
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 |
_version_ |
1792494503281557504 |