Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017
The Global Positioning System (GPS) and Gravity Recovery and Climate Experiment (GRACE) provide important geodetic datasets to study glacial mass change. Applying the multichannel singular spectral analysis to the GPS-measured vertical and horizonal crustal displacement and GRACE-derived vertical di...
Published in: | Earth and Planetary Science Letters |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://orbit.dtu.dk/en/publications/f18d5ccd-6e1d-4cdd-b9a4-6309fe109288 https://doi.org/10.1016/j.epsl.2018.09.029 |
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ftdtupubl:oai:pure.atira.dk:publications/f18d5ccd-6e1d-4cdd-b9a4-6309fe109288 2023-11-05T03:42:06+01:00 Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017 Zhang, Bao Zhang, Enze Liu, Lin Khan, Shfaqat Abbas van Dam, Tonie Yao, Yibin Bevis, Michael Helm, Veit 2018 https://orbit.dtu.dk/en/publications/f18d5ccd-6e1d-4cdd-b9a4-6309fe109288 https://doi.org/10.1016/j.epsl.2018.09.029 eng eng info:eu-repo/semantics/closedAccess Zhang , B , Zhang , E , Liu , L , Khan , S A , van Dam , T , Yao , Y , Bevis , M & Helm , V 2018 , ' Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017 ' , Earth and Planetary Science Letters , vol. 503 , pp. 216-226 . https://doi.org/10.1016/j.epsl.2018.09.029 Jakobshavn Isbræ Geodetic measurements Short-term ice mass change Dynamic thickening article 2018 ftdtupubl https://doi.org/10.1016/j.epsl.2018.09.029 2023-10-11T23:00:15Z The Global Positioning System (GPS) and Gravity Recovery and Climate Experiment (GRACE) provide important geodetic datasets to study glacial mass change. Applying the multichannel singular spectral analysis to the GPS-measured vertical and horizonal crustal displacement and GRACE-derived vertical displacement near Jakobshavn Isbræ (JI) in western Greenland from 2007 to 2017, we reconstruct the short-term loading displacements due to ice mass changes. Both the vertical and east displacements show strong seasonal variability. They also reveal three episodes of transient displacements: downward and eastward motion from late 2007 to around 2010, sustained upward and westward motion from 2010 to early 2013, and downward and eastward motion till late 2016. We also forward model the seasonal and transient displacements caused by surface mass balance (SMB) and glacier dynamics. Our model agrees well with the geodetic observations and provides quantitative insights into the contribution from SMB and ice dynamics to the ice mass changes. We find that SMB is the dominant contributor to the seasonal and transient displacements at three out of four GPS sites (AASI, ILUL, and QEQE). While, at the fourth GPS site (KAGA) that is closest to the glacier, the contributions to the transient displacements from SMB and glacier dynamics are comparable. The forward modeling also suggests that the dynamic mass change in the JI catchment underwent strong seasonal variations and these variations correlated more with the seasonal retreat and advance of the calving front than with the changes of glacial velocities. Our altimetry results reveal that the frontal portion of JI catchment lost 34 Gt in 2012 and this loss of ice declined to only 11 Gt in 2016 due to widespread thickening along the main flowline. Article in Journal/Newspaper glacier Greenland Jakobshavn Jakobshavn isbræ Technical University of Denmark: DTU Orbit Earth and Planetary Science Letters 503 216 226 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Jakobshavn Isbræ Geodetic measurements Short-term ice mass change Dynamic thickening |
spellingShingle |
Jakobshavn Isbræ Geodetic measurements Short-term ice mass change Dynamic thickening Zhang, Bao Zhang, Enze Liu, Lin Khan, Shfaqat Abbas van Dam, Tonie Yao, Yibin Bevis, Michael Helm, Veit Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017 |
topic_facet |
Jakobshavn Isbræ Geodetic measurements Short-term ice mass change Dynamic thickening |
description |
The Global Positioning System (GPS) and Gravity Recovery and Climate Experiment (GRACE) provide important geodetic datasets to study glacial mass change. Applying the multichannel singular spectral analysis to the GPS-measured vertical and horizonal crustal displacement and GRACE-derived vertical displacement near Jakobshavn Isbræ (JI) in western Greenland from 2007 to 2017, we reconstruct the short-term loading displacements due to ice mass changes. Both the vertical and east displacements show strong seasonal variability. They also reveal three episodes of transient displacements: downward and eastward motion from late 2007 to around 2010, sustained upward and westward motion from 2010 to early 2013, and downward and eastward motion till late 2016. We also forward model the seasonal and transient displacements caused by surface mass balance (SMB) and glacier dynamics. Our model agrees well with the geodetic observations and provides quantitative insights into the contribution from SMB and ice dynamics to the ice mass changes. We find that SMB is the dominant contributor to the seasonal and transient displacements at three out of four GPS sites (AASI, ILUL, and QEQE). While, at the fourth GPS site (KAGA) that is closest to the glacier, the contributions to the transient displacements from SMB and glacier dynamics are comparable. The forward modeling also suggests that the dynamic mass change in the JI catchment underwent strong seasonal variations and these variations correlated more with the seasonal retreat and advance of the calving front than with the changes of glacial velocities. Our altimetry results reveal that the frontal portion of JI catchment lost 34 Gt in 2012 and this loss of ice declined to only 11 Gt in 2016 due to widespread thickening along the main flowline. |
format |
Article in Journal/Newspaper |
author |
Zhang, Bao Zhang, Enze Liu, Lin Khan, Shfaqat Abbas van Dam, Tonie Yao, Yibin Bevis, Michael Helm, Veit |
author_facet |
Zhang, Bao Zhang, Enze Liu, Lin Khan, Shfaqat Abbas van Dam, Tonie Yao, Yibin Bevis, Michael Helm, Veit |
author_sort |
Zhang, Bao |
title |
Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017 |
title_short |
Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017 |
title_full |
Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017 |
title_fullStr |
Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017 |
title_full_unstemmed |
Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017 |
title_sort |
geodetic measurements reveal short-term changes of glacial mass near jakobshavn isbræ (greenland) from 2007 to 2017 |
publishDate |
2018 |
url |
https://orbit.dtu.dk/en/publications/f18d5ccd-6e1d-4cdd-b9a4-6309fe109288 https://doi.org/10.1016/j.epsl.2018.09.029 |
genre |
glacier Greenland Jakobshavn Jakobshavn isbræ |
genre_facet |
glacier Greenland Jakobshavn Jakobshavn isbræ |
op_source |
Zhang , B , Zhang , E , Liu , L , Khan , S A , van Dam , T , Yao , Y , Bevis , M & Helm , V 2018 , ' Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017 ' , Earth and Planetary Science Letters , vol. 503 , pp. 216-226 . https://doi.org/10.1016/j.epsl.2018.09.029 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2018.09.029 |
container_title |
Earth and Planetary Science Letters |
container_volume |
503 |
container_start_page |
216 |
op_container_end_page |
226 |
_version_ |
1781698985992388608 |