Revisiting the global mean ocean mass budget over 2005–2020
We investigate the performances of Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) satellite gravimetry missions in assessing the ocean mass budget at the global scale over 2005–2020. For that purpose, we focus on the last years of the record (2015–2020) when GRACE and...
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Online Access: | https://doi.org/10.5194/os-19-321-2023 https://os.copernicus.org/articles/19/321/2023/ |
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ftcopernicus:oai:publications.copernicus.org:os105486 2023-05-15T14:13:41+02:00 Revisiting the global mean ocean mass budget over 2005–2020 Barnoud, Anne Pfeffer, Julia Cazenave, Anny Fraudeau, Robin Rousseau, Victor Ablain, Michaël 2023-03-23 application/pdf https://doi.org/10.5194/os-19-321-2023 https://os.copernicus.org/articles/19/321/2023/ eng eng doi:10.5194/os-19-321-2023 https://os.copernicus.org/articles/19/321/2023/ eISSN: 1812-0792 Text 2023 ftcopernicus https://doi.org/10.5194/os-19-321-2023 2023-03-27T16:23:11Z We investigate the performances of Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) satellite gravimetry missions in assessing the ocean mass budget at the global scale over 2005–2020. For that purpose, we focus on the last years of the record (2015–2020) when GRACE and GRACE Follow-On faced instrumental problems. We compare the global mean ocean mass estimates from GRACE and GRACE Follow-On to the sum of its contributions from Greenland, Antarctica, land glaciers, terrestrial water storage and atmospheric water content estimated with independent observations. Significant residuals are observed in the global mean ocean mass budget at interannual timescales. Our analyses suggest that the terrestrial water storage variations based on global hydrological models likely contribute in large part to the misclosure of the global mean ocean mass budget at interannual timescales. We also compare the GRACE-based global mean ocean mass with the altimetry-based global mean sea level corrected for the Argo-based thermosteric contribution (an equivalent of global mean ocean mass). After correcting for the wet troposphere drift of the radiometer on board the Jason-3 altimeter satellite, we find that mass budget misclosure is reduced but still significant. However, replacing the Argo-based thermosteric component by the Ocean Reanalysis System 5 (ORAS5) or from the Clouds and the Earth's Radiant Energy System (CERES) top of the atmosphere observations significantly reduces the residuals of the mass budget over the 2015–2020 time span. We conclude that the two most likely sources of error in the global mean ocean mass budget are the thermosteric component based on Argo and the terrestrial water storage contribution based on global hydrological models. The GRACE and GRACE Follow-On data are unlikely to be responsible on their own for the non-closure of the global mean ocean mass budget. Text Antarc* Antarctica Greenland Copernicus Publications: E-Journals Greenland Ocean Science 19 2 321 334 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
We investigate the performances of Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) satellite gravimetry missions in assessing the ocean mass budget at the global scale over 2005–2020. For that purpose, we focus on the last years of the record (2015–2020) when GRACE and GRACE Follow-On faced instrumental problems. We compare the global mean ocean mass estimates from GRACE and GRACE Follow-On to the sum of its contributions from Greenland, Antarctica, land glaciers, terrestrial water storage and atmospheric water content estimated with independent observations. Significant residuals are observed in the global mean ocean mass budget at interannual timescales. Our analyses suggest that the terrestrial water storage variations based on global hydrological models likely contribute in large part to the misclosure of the global mean ocean mass budget at interannual timescales. We also compare the GRACE-based global mean ocean mass with the altimetry-based global mean sea level corrected for the Argo-based thermosteric contribution (an equivalent of global mean ocean mass). After correcting for the wet troposphere drift of the radiometer on board the Jason-3 altimeter satellite, we find that mass budget misclosure is reduced but still significant. However, replacing the Argo-based thermosteric component by the Ocean Reanalysis System 5 (ORAS5) or from the Clouds and the Earth's Radiant Energy System (CERES) top of the atmosphere observations significantly reduces the residuals of the mass budget over the 2015–2020 time span. We conclude that the two most likely sources of error in the global mean ocean mass budget are the thermosteric component based on Argo and the terrestrial water storage contribution based on global hydrological models. The GRACE and GRACE Follow-On data are unlikely to be responsible on their own for the non-closure of the global mean ocean mass budget. |
format |
Text |
author |
Barnoud, Anne Pfeffer, Julia Cazenave, Anny Fraudeau, Robin Rousseau, Victor Ablain, Michaël |
spellingShingle |
Barnoud, Anne Pfeffer, Julia Cazenave, Anny Fraudeau, Robin Rousseau, Victor Ablain, Michaël Revisiting the global mean ocean mass budget over 2005–2020 |
author_facet |
Barnoud, Anne Pfeffer, Julia Cazenave, Anny Fraudeau, Robin Rousseau, Victor Ablain, Michaël |
author_sort |
Barnoud, Anne |
title |
Revisiting the global mean ocean mass budget over 2005–2020 |
title_short |
Revisiting the global mean ocean mass budget over 2005–2020 |
title_full |
Revisiting the global mean ocean mass budget over 2005–2020 |
title_fullStr |
Revisiting the global mean ocean mass budget over 2005–2020 |
title_full_unstemmed |
Revisiting the global mean ocean mass budget over 2005–2020 |
title_sort |
revisiting the global mean ocean mass budget over 2005–2020 |
publishDate |
2023 |
url |
https://doi.org/10.5194/os-19-321-2023 https://os.copernicus.org/articles/19/321/2023/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland |
genre_facet |
Antarc* Antarctica Greenland |
op_source |
eISSN: 1812-0792 |
op_relation |
doi:10.5194/os-19-321-2023 https://os.copernicus.org/articles/19/321/2023/ |
op_doi |
https://doi.org/10.5194/os-19-321-2023 |
container_title |
Ocean Science |
container_volume |
19 |
container_issue |
2 |
container_start_page |
321 |
op_container_end_page |
334 |
_version_ |
1766286178959491072 |