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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2023
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ftdoajarticles:oai:doaj.org/article:41367ad7b283422caa3390467822eb5d 2023-05-15T14:07:51+02:00 Revisiting the global mean ocean mass budget over 2005–2020 A. Barnoud J. Pfeffer A. Cazenave R. Fraudeau V. Rousseau M. Ablain 2023-03-01T00:00:00Z https://doi.org/10.5194/os-19-321-2023 https://doaj.org/article/41367ad7b283422caa3390467822eb5d EN eng Copernicus Publications https://os.copernicus.org/articles/19/321/2023/os-19-321-2023.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-19-321-2023 1812-0784 1812-0792 https://doaj.org/article/41367ad7b283422caa3390467822eb5d Ocean Science, Vol 19, Pp 321-334 (2023) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2023 ftdoajarticles https://doi.org/10.5194/os-19-321-2023 2023-03-26T01:30:40Z 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. Article in Journal/Newspaper Antarc* Antarctica Greenland Directory of Open Access Journals: DOAJ Articles Greenland Ocean Science 19 2 321 334 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 A. Barnoud J. Pfeffer A. Cazenave R. Fraudeau V. Rousseau M. Ablain Revisiting the global mean ocean mass budget over 2005–2020 |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
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 |
Article in Journal/Newspaper |
author |
A. Barnoud J. Pfeffer A. Cazenave R. Fraudeau V. Rousseau M. Ablain |
author_facet |
A. Barnoud J. Pfeffer A. Cazenave R. Fraudeau V. Rousseau M. Ablain |
author_sort |
A. Barnoud |
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 |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/os-19-321-2023 https://doaj.org/article/41367ad7b283422caa3390467822eb5d |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland |
genre_facet |
Antarc* Antarctica Greenland |
op_source |
Ocean Science, Vol 19, Pp 321-334 (2023) |
op_relation |
https://os.copernicus.org/articles/19/321/2023/os-19-321-2023.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-19-321-2023 1812-0784 1812-0792 https://doaj.org/article/41367ad7b283422caa3390467822eb5d |
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 |
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1766279896412192768 |