Impact of Low-Degree Stokes Coefficients and Spatial Leakage on Barystatic Sea-Level Rise from GRACE/GRACE-FO
Temporal variations in the total ocean mass representing the barystatic part of present-day global-mean sea-level rise can be directly inferred from time-series of global gravity fields as provided by the GRACE and GRACE-FO missions. A spatial integration over all ocean regions, however, largely und...
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ftoceanrep:oai:oceanrep.geomar.de:55535 2023-05-15T14:11:22+02:00 Impact of Low-Degree Stokes Coefficients and Spatial Leakage on Barystatic Sea-Level Rise from GRACE/GRACE-FO Thomas, Maik Dobslaw, Henryk Bagge, Meike Dill, Robert Klemann, Volker Boergens, Eva Dahle, Christoph Flechtner, Frank 2021 text https://oceanrep.geomar.de/id/eprint/55535/ https://oceanrep.geomar.de/id/eprint/55535/1/EGU21_11684.pdf https://doi.org/10.5194/egusphere-egu21-9558 en eng https://oceanrep.geomar.de/id/eprint/55535/1/EGU21_11684.pdf Thomas, M., Dobslaw, H., Bagge, M., Dill, R., Klemann, V., Boergens, E., Dahle, C. and Flechtner, F. (2021) Impact of Low-Degree Stokes Coefficients and Spatial Leakage on Barystatic Sea-Level Rise from GRACE/GRACE-FO. Open Access [PICO] In: EGU General Assembly 2021. , 19.-30.03.2021, Online . DOI 10.5194/egusphere-egu21-9558 <https://doi.org/10.5194/egusphere-egu21-9558>. doi:10.5194/egusphere-egu21-9558 cc_by_4.0 info:eu-repo/semantics/openAccess Conference or Workshop Item NonPeerReviewed 2021 ftoceanrep https://doi.org/10.5194/egusphere-egu21-9558 2023-04-07T16:01:26Z Temporal variations in the total ocean mass representing the barystatic part of present-day global-mean sea-level rise can be directly inferred from time-series of global gravity fields as provided by the GRACE and GRACE-FO missions. A spatial integration over all ocean regions, however, largely underestimates present-day rates as long as the effects of spatial leakage along the coasts of in particular Antarctica, Greenland, and the various islands of the Canadian Archipelago are not properly considered. Based on the latest release 06 of monthly gravity fields processed at GFZ, we quantify (and subsequently correct) the contribution of spatial leakage to the post-processed mass anomalies of continental water storage and ocean bottom pressure. We find that by utilizing the sea level equation to predict spatially variable ocean mass trends out of the (leakage-corrected) terrrestial mass distributions from GRACE and GRACE-FO consistent results are obtained also from spatial integrations over ocean masks with different coastal buffer zones ranging from 400 to 1000 km. However, the results are critically dependent on coefficients of degree 1, 2 and 3, that are not precisely determined from GRACE data alone and need to be augemented by information from satellite laser ranging. We will particularly discuss the impact of those low-degree harmonics on the secular rates in global barystatic sea-level. Conference Object Antarc* Antarctica Canadian Archipelago Greenland OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Greenland |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Temporal variations in the total ocean mass representing the barystatic part of present-day global-mean sea-level rise can be directly inferred from time-series of global gravity fields as provided by the GRACE and GRACE-FO missions. A spatial integration over all ocean regions, however, largely underestimates present-day rates as long as the effects of spatial leakage along the coasts of in particular Antarctica, Greenland, and the various islands of the Canadian Archipelago are not properly considered. Based on the latest release 06 of monthly gravity fields processed at GFZ, we quantify (and subsequently correct) the contribution of spatial leakage to the post-processed mass anomalies of continental water storage and ocean bottom pressure. We find that by utilizing the sea level equation to predict spatially variable ocean mass trends out of the (leakage-corrected) terrrestial mass distributions from GRACE and GRACE-FO consistent results are obtained also from spatial integrations over ocean masks with different coastal buffer zones ranging from 400 to 1000 km. However, the results are critically dependent on coefficients of degree 1, 2 and 3, that are not precisely determined from GRACE data alone and need to be augemented by information from satellite laser ranging. We will particularly discuss the impact of those low-degree harmonics on the secular rates in global barystatic sea-level. |
format |
Conference Object |
author |
Thomas, Maik Dobslaw, Henryk Bagge, Meike Dill, Robert Klemann, Volker Boergens, Eva Dahle, Christoph Flechtner, Frank |
spellingShingle |
Thomas, Maik Dobslaw, Henryk Bagge, Meike Dill, Robert Klemann, Volker Boergens, Eva Dahle, Christoph Flechtner, Frank Impact of Low-Degree Stokes Coefficients and Spatial Leakage on Barystatic Sea-Level Rise from GRACE/GRACE-FO |
author_facet |
Thomas, Maik Dobslaw, Henryk Bagge, Meike Dill, Robert Klemann, Volker Boergens, Eva Dahle, Christoph Flechtner, Frank |
author_sort |
Thomas, Maik |
title |
Impact of Low-Degree Stokes Coefficients and Spatial Leakage on Barystatic Sea-Level Rise from GRACE/GRACE-FO |
title_short |
Impact of Low-Degree Stokes Coefficients and Spatial Leakage on Barystatic Sea-Level Rise from GRACE/GRACE-FO |
title_full |
Impact of Low-Degree Stokes Coefficients and Spatial Leakage on Barystatic Sea-Level Rise from GRACE/GRACE-FO |
title_fullStr |
Impact of Low-Degree Stokes Coefficients and Spatial Leakage on Barystatic Sea-Level Rise from GRACE/GRACE-FO |
title_full_unstemmed |
Impact of Low-Degree Stokes Coefficients and Spatial Leakage on Barystatic Sea-Level Rise from GRACE/GRACE-FO |
title_sort |
impact of low-degree stokes coefficients and spatial leakage on barystatic sea-level rise from grace/grace-fo |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/55535/ https://oceanrep.geomar.de/id/eprint/55535/1/EGU21_11684.pdf https://doi.org/10.5194/egusphere-egu21-9558 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Canadian Archipelago Greenland |
genre_facet |
Antarc* Antarctica Canadian Archipelago Greenland |
op_relation |
https://oceanrep.geomar.de/id/eprint/55535/1/EGU21_11684.pdf Thomas, M., Dobslaw, H., Bagge, M., Dill, R., Klemann, V., Boergens, E., Dahle, C. and Flechtner, F. (2021) Impact of Low-Degree Stokes Coefficients and Spatial Leakage on Barystatic Sea-Level Rise from GRACE/GRACE-FO. Open Access [PICO] In: EGU General Assembly 2021. , 19.-30.03.2021, Online . DOI 10.5194/egusphere-egu21-9558 <https://doi.org/10.5194/egusphere-egu21-9558>. doi:10.5194/egusphere-egu21-9558 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-egu21-9558 |
_version_ |
1766283493005852672 |