Regional ice-mass changes and glacial-isostatic adjustment in Antarctica from GRACE
We infer regional mass changes in Antarctica using ca. 4 years of Gravity Recovery and Climate Experiment (GRACE) level 2 data. We decompose the time series of the Stokes coefficients into their linear as well as annual and semi-annual components by a least-squares adjustment and apply a statistical...
Published in: | Earth and Planetary Science Letters |
---|---|
Main Authors: | , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2007
|
Subjects: | |
Online Access: | https://gfzpublic.gfz-potsdam.de/pubman/item/item_236033 https://gfzpublic.gfz-potsdam.de/pubman/item/item_236033_1/component/file_236032/10449.pdf |
id |
ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_236033 |
---|---|
record_format |
openpolar |
spelling |
ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_236033 2023-05-15T13:23:49+02:00 Regional ice-mass changes and glacial-isostatic adjustment in Antarctica from GRACE Sasgen, I. Martinec, Z. Fleming, K. 1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum 2007 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_236033 https://gfzpublic.gfz-potsdam.de/pubman/item/item_236033_1/component/file_236032/10449.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2007.09.029 https://gfzpublic.gfz-potsdam.de/pubman/item/item_236033 https://gfzpublic.gfz-potsdam.de/pubman/item/item_236033_1/component/file_236032/10449.pdf info:eu-repo/semantics/openAccess Earth and Planetary Science Letters 550 - Earth sciences info:eu-repo/semantics/article 2007 ftgfzpotsdam https://doi.org/10.1016/j.epsl.2007.09.029 2022-09-14T05:54:44Z We infer regional mass changes in Antarctica using ca. 4 years of Gravity Recovery and Climate Experiment (GRACE) level 2 data. We decompose the time series of the Stokes coefficients into their linear as well as annual and semi-annual components by a least-squares adjustment and apply a statistical reliability test to the Stokes potential-coefficients' linear temporal trends. Mass changes in three regions of Antarctica that display prominent geoid-height change are determined by adjusting predictions of glacier melting at the tip of the Antarctic Peninsula and in the Amundsen Sea Sector, and of the glacial-isostatic adjustment (GIA) over the Ronne Ice Shelf. We use the GFZ RL04, CNES RL01C, JPL RL04 and CSR RL04 potential-coefficient releases, and show that, although all data sets consistently reflect the prominent mass changes, differences in the mass-change estimates are considerably larger than the uncertainties estimated by the propagation of the GRACE errors. We then use the bootstrapping method based on the four releases and six time intervals, each with 3.5 years of data, to quantify the variability of the mean mass-change estimates. We find 95% of our estimates to lie within 0.08 and 0.09 mm/a equivalent sea-level (ESL) change for the Antarctic Peninsula and within 0.18 and 0.20 mm/a ESL for the Amundsen Sea Sector. Forward modelling of the GIA over the Ronne Ice Shelf region suggests that the Antarctic continent was covered by 8.4 to 9.4 m ESL of additional ice during the Last-Glacial Maximum (ca. 22 to 15 ka BP). With regards to the mantle-viscosity values and the glacial history used, this value is considered as a minimum estimate. The mass-change estimates derived from all GRACE releases and time intervals lie within ca. 20% (Amundsen Sea Sector), 30% (Antarctic Peninsula) and 50% (Ronne Ice Shelf region) of the bootstrap-estimated mean, demonstrating the reliability of results obtained using GRACE observations. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Ronne Ice Shelf GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic The Antarctic Antarctic Peninsula Amundsen Sea Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Earth and Planetary Science Letters 264 3-4 391 401 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
topic |
550 - Earth sciences |
spellingShingle |
550 - Earth sciences Sasgen, I. Martinec, Z. Fleming, K. Regional ice-mass changes and glacial-isostatic adjustment in Antarctica from GRACE |
topic_facet |
550 - Earth sciences |
description |
We infer regional mass changes in Antarctica using ca. 4 years of Gravity Recovery and Climate Experiment (GRACE) level 2 data. We decompose the time series of the Stokes coefficients into their linear as well as annual and semi-annual components by a least-squares adjustment and apply a statistical reliability test to the Stokes potential-coefficients' linear temporal trends. Mass changes in three regions of Antarctica that display prominent geoid-height change are determined by adjusting predictions of glacier melting at the tip of the Antarctic Peninsula and in the Amundsen Sea Sector, and of the glacial-isostatic adjustment (GIA) over the Ronne Ice Shelf. We use the GFZ RL04, CNES RL01C, JPL RL04 and CSR RL04 potential-coefficient releases, and show that, although all data sets consistently reflect the prominent mass changes, differences in the mass-change estimates are considerably larger than the uncertainties estimated by the propagation of the GRACE errors. We then use the bootstrapping method based on the four releases and six time intervals, each with 3.5 years of data, to quantify the variability of the mean mass-change estimates. We find 95% of our estimates to lie within 0.08 and 0.09 mm/a equivalent sea-level (ESL) change for the Antarctic Peninsula and within 0.18 and 0.20 mm/a ESL for the Amundsen Sea Sector. Forward modelling of the GIA over the Ronne Ice Shelf region suggests that the Antarctic continent was covered by 8.4 to 9.4 m ESL of additional ice during the Last-Glacial Maximum (ca. 22 to 15 ka BP). With regards to the mantle-viscosity values and the glacial history used, this value is considered as a minimum estimate. The mass-change estimates derived from all GRACE releases and time intervals lie within ca. 20% (Amundsen Sea Sector), 30% (Antarctic Peninsula) and 50% (Ronne Ice Shelf region) of the bootstrap-estimated mean, demonstrating the reliability of results obtained using GRACE observations. |
author2 |
1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum |
format |
Article in Journal/Newspaper |
author |
Sasgen, I. Martinec, Z. Fleming, K. |
author_facet |
Sasgen, I. Martinec, Z. Fleming, K. |
author_sort |
Sasgen, I. |
title |
Regional ice-mass changes and glacial-isostatic adjustment in Antarctica from GRACE |
title_short |
Regional ice-mass changes and glacial-isostatic adjustment in Antarctica from GRACE |
title_full |
Regional ice-mass changes and glacial-isostatic adjustment in Antarctica from GRACE |
title_fullStr |
Regional ice-mass changes and glacial-isostatic adjustment in Antarctica from GRACE |
title_full_unstemmed |
Regional ice-mass changes and glacial-isostatic adjustment in Antarctica from GRACE |
title_sort |
regional ice-mass changes and glacial-isostatic adjustment in antarctica from grace |
publishDate |
2007 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_236033 https://gfzpublic.gfz-potsdam.de/pubman/item/item_236033_1/component/file_236032/10449.pdf |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Amundsen Sea Ronne Ice Shelf |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Amundsen Sea Ronne Ice Shelf |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Ronne Ice Shelf |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Ronne Ice Shelf |
op_source |
Earth and Planetary Science Letters |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2007.09.029 https://gfzpublic.gfz-potsdam.de/pubman/item/item_236033 https://gfzpublic.gfz-potsdam.de/pubman/item/item_236033_1/component/file_236032/10449.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2007.09.029 |
container_title |
Earth and Planetary Science Letters |
container_volume |
264 |
container_issue |
3-4 |
container_start_page |
391 |
op_container_end_page |
401 |
_version_ |
1766375576708317184 |