The influence of Antarctic ice loss on polar motion: an assessment based on GRACE and multi-mission satellite altimetry
Abstract Increasing ice loss of the Antarctic Ice Sheet (AIS) due to global climate change affects the orientation of the Earth’s spin axis with respect to an Earth-fixed reference system (polar motion). Here the contribution of the decreasing AIS to the excitation of polar motion is quantified from...
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ftdoajarticles:oai:doaj.org/article:3106f04b558242298cb19e5ba71b3a21 2023-05-15T13:53:10+02:00 The influence of Antarctic ice loss on polar motion: an assessment based on GRACE and multi-mission satellite altimetry Franziska Göttl Andreas Groh Michael Schmidt Ludwig Schröder Florian Seitz 2021-04-01T00:00:00Z https://doi.org/10.1186/s40623-021-01403-6 https://doaj.org/article/3106f04b558242298cb19e5ba71b3a21 EN eng SpringerOpen https://doi.org/10.1186/s40623-021-01403-6 https://doaj.org/toc/1880-5981 doi:10.1186/s40623-021-01403-6 1880-5981 https://doaj.org/article/3106f04b558242298cb19e5ba71b3a21 Earth, Planets and Space, Vol 73, Iss 1, Pp 1-16 (2021) Antarctic polar motion excitations Combination of GRACE and satellite altimetry data Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.1186/s40623-021-01403-6 2022-12-31T16:38:01Z Abstract Increasing ice loss of the Antarctic Ice Sheet (AIS) due to global climate change affects the orientation of the Earth’s spin axis with respect to an Earth-fixed reference system (polar motion). Here the contribution of the decreasing AIS to the excitation of polar motion is quantified from precise time variable gravity field observations of the Gravity Recovery and Climate Experiment (GRACE) and from measurements of the changing ice sheet elevation from altimeter satellites. While the GRACE gravity field models need to be reduced by noise and leakage effects from neighboring subsystems, the ice volume changes observed by satellite altimetry have to be converted into ice mass changes. In this study we investigate how much individual gravimetry and altimetry solutions differ from each other. We show that due to combination of individual solutions systematic and random errors of the data processing can be reduced and the robustness of the geodetic derived AIS polar motion excitations can be increased. We investigate the interannual variability of the Antarctic polar motion excitation functions by means of piecewise linear trends. We find that the long-term behavior of the three ice sheet subregions: EAIS (East Antarctic Ice Sheet), WAIS (West Antarctic Ice Sheet) and APIS (Antarctic Peninsula Ice Sheet) is quite different. While APIS polar motion excitations show no significant interannual variations during the study period $$2003-2015$$ 2003 - 2015 , the trend of the WAIS and EAIS polar motion excitations increased in 2006 and again in 2009 while it started slightly to decline in 2013. AIS mass changes explain about $$45\%$$ 45 % of the observed magnitude of the polar motion vector (excluding glacial isosatic adjustment). They cause the pole position vector to drift along $$59^{\circ }$$ 59 ∘ East longitude with an amplitude of 2.7 mas/yr. Thus the contribution of the AIS has to be considered to close the budget of the geophysical excitation functions of polar motion. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Sheet Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Antarctic Peninsula West Antarctic Ice Sheet East Antarctic Ice Sheet Earth, Planets and Space 73 1 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic polar motion excitations Combination of GRACE and satellite altimetry data Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 |
spellingShingle |
Antarctic polar motion excitations Combination of GRACE and satellite altimetry data Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 Franziska Göttl Andreas Groh Michael Schmidt Ludwig Schröder Florian Seitz The influence of Antarctic ice loss on polar motion: an assessment based on GRACE and multi-mission satellite altimetry |
topic_facet |
Antarctic polar motion excitations Combination of GRACE and satellite altimetry data Geography. Anthropology. Recreation G Geodesy QB275-343 Geology QE1-996.5 |
description |
Abstract Increasing ice loss of the Antarctic Ice Sheet (AIS) due to global climate change affects the orientation of the Earth’s spin axis with respect to an Earth-fixed reference system (polar motion). Here the contribution of the decreasing AIS to the excitation of polar motion is quantified from precise time variable gravity field observations of the Gravity Recovery and Climate Experiment (GRACE) and from measurements of the changing ice sheet elevation from altimeter satellites. While the GRACE gravity field models need to be reduced by noise and leakage effects from neighboring subsystems, the ice volume changes observed by satellite altimetry have to be converted into ice mass changes. In this study we investigate how much individual gravimetry and altimetry solutions differ from each other. We show that due to combination of individual solutions systematic and random errors of the data processing can be reduced and the robustness of the geodetic derived AIS polar motion excitations can be increased. We investigate the interannual variability of the Antarctic polar motion excitation functions by means of piecewise linear trends. We find that the long-term behavior of the three ice sheet subregions: EAIS (East Antarctic Ice Sheet), WAIS (West Antarctic Ice Sheet) and APIS (Antarctic Peninsula Ice Sheet) is quite different. While APIS polar motion excitations show no significant interannual variations during the study period $$2003-2015$$ 2003 - 2015 , the trend of the WAIS and EAIS polar motion excitations increased in 2006 and again in 2009 while it started slightly to decline in 2013. AIS mass changes explain about $$45\%$$ 45 % of the observed magnitude of the polar motion vector (excluding glacial isosatic adjustment). They cause the pole position vector to drift along $$59^{\circ }$$ 59 ∘ East longitude with an amplitude of 2.7 mas/yr. Thus the contribution of the AIS has to be considered to close the budget of the geophysical excitation functions of polar motion. |
format |
Article in Journal/Newspaper |
author |
Franziska Göttl Andreas Groh Michael Schmidt Ludwig Schröder Florian Seitz |
author_facet |
Franziska Göttl Andreas Groh Michael Schmidt Ludwig Schröder Florian Seitz |
author_sort |
Franziska Göttl |
title |
The influence of Antarctic ice loss on polar motion: an assessment based on GRACE and multi-mission satellite altimetry |
title_short |
The influence of Antarctic ice loss on polar motion: an assessment based on GRACE and multi-mission satellite altimetry |
title_full |
The influence of Antarctic ice loss on polar motion: an assessment based on GRACE and multi-mission satellite altimetry |
title_fullStr |
The influence of Antarctic ice loss on polar motion: an assessment based on GRACE and multi-mission satellite altimetry |
title_full_unstemmed |
The influence of Antarctic ice loss on polar motion: an assessment based on GRACE and multi-mission satellite altimetry |
title_sort |
influence of antarctic ice loss on polar motion: an assessment based on grace and multi-mission satellite altimetry |
publisher |
SpringerOpen |
publishDate |
2021 |
url |
https://doi.org/10.1186/s40623-021-01403-6 https://doaj.org/article/3106f04b558242298cb19e5ba71b3a21 |
geographic |
Antarctic The Antarctic Antarctic Peninsula West Antarctic Ice Sheet East Antarctic Ice Sheet |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula West Antarctic Ice Sheet East Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Sheet |
op_source |
Earth, Planets and Space, Vol 73, Iss 1, Pp 1-16 (2021) |
op_relation |
https://doi.org/10.1186/s40623-021-01403-6 https://doaj.org/toc/1880-5981 doi:10.1186/s40623-021-01403-6 1880-5981 https://doaj.org/article/3106f04b558242298cb19e5ba71b3a21 |
op_doi |
https://doi.org/10.1186/s40623-021-01403-6 |
container_title |
Earth, Planets and Space |
container_volume |
73 |
container_issue |
1 |
_version_ |
1766258134706290688 |