Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect
SUMMARY Signal leakage between the land and ocean is a challenge in using Gravity Recovery and Climate Experiment (GRACE) observation data to study global mass redistributions. Although the leakage occurs in both directions, more attention has been paid to the land-to-ocean leakage and less to the o...
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croxfordunivpr:10.1093/gji/ggaa022 2024-09-30T14:31:27+00:00 Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect Yi, Shuang Heki, Kosuke Japan Society for the Promotion of Science Alexander von Humboldt Foundation 2020 http://dx.doi.org/10.1093/gji/ggaa022 http://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggaa022/31788015/ggaa022.pdf http://academic.oup.com/gji/article-pdf/221/1/603/32510938/ggaa022.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Geophysical Journal International volume 221, issue 1, page 603-616 ISSN 0956-540X 1365-246X journal-article 2020 croxfordunivpr https://doi.org/10.1093/gji/ggaa022 2024-09-03T04:10:34Z SUMMARY Signal leakage between the land and ocean is a challenge in using Gravity Recovery and Climate Experiment (GRACE) observation data to study global mass redistributions. Although the leakage occurs in both directions, more attention has been paid to the land-to-ocean leakage and less to the ocean-to-land leakage. Here, we show that the ocean-to-land leakage is non-uniform and non-negligible and propose a new forward modelling method to fully consider bi-directional leakages with the help of the global Ocean ReAnalysis System ORAS5. This observation-driven model could significantly reduce the variations in ocean grids and thus decrease the ocean-to-land leakage. The results with different treatment of the ocean signal leakage are compared. We find that failing to consider the ocean-to-land leakage will cause an underestimation of ∼20 per cent in the seasonal variation and will introduce a bias of several giga-tons in the secular trend. Although the uniform and non-uniform model have similar results in the global average of seasonal mass variations, the non-uniform ocean model is necessary in most places, especially near the Arctic Ocean, the Sea of Japan and the Gulf of Carpentaria. Despite these achievements, we also point out that there is still much room for improvement in ocean mass models, particularly in long-term trends. Our results indicate the importance of the ocean-to-land leakage correction in the mass estimation in coastal land areas using the GRACE data. Article in Journal/Newspaper Arctic Arctic Ocean Oxford University Press Arctic Arctic Ocean Geophysical Journal International 221 1 603 616 |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
SUMMARY Signal leakage between the land and ocean is a challenge in using Gravity Recovery and Climate Experiment (GRACE) observation data to study global mass redistributions. Although the leakage occurs in both directions, more attention has been paid to the land-to-ocean leakage and less to the ocean-to-land leakage. Here, we show that the ocean-to-land leakage is non-uniform and non-negligible and propose a new forward modelling method to fully consider bi-directional leakages with the help of the global Ocean ReAnalysis System ORAS5. This observation-driven model could significantly reduce the variations in ocean grids and thus decrease the ocean-to-land leakage. The results with different treatment of the ocean signal leakage are compared. We find that failing to consider the ocean-to-land leakage will cause an underestimation of ∼20 per cent in the seasonal variation and will introduce a bias of several giga-tons in the secular trend. Although the uniform and non-uniform model have similar results in the global average of seasonal mass variations, the non-uniform ocean model is necessary in most places, especially near the Arctic Ocean, the Sea of Japan and the Gulf of Carpentaria. Despite these achievements, we also point out that there is still much room for improvement in ocean mass models, particularly in long-term trends. Our results indicate the importance of the ocean-to-land leakage correction in the mass estimation in coastal land areas using the GRACE data. |
author2 |
Japan Society for the Promotion of Science Alexander von Humboldt Foundation |
format |
Article in Journal/Newspaper |
author |
Yi, Shuang Heki, Kosuke |
spellingShingle |
Yi, Shuang Heki, Kosuke Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect |
author_facet |
Yi, Shuang Heki, Kosuke |
author_sort |
Yi, Shuang |
title |
Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect |
title_short |
Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect |
title_full |
Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect |
title_fullStr |
Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect |
title_full_unstemmed |
Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect |
title_sort |
heterogeneous oceanic mass distribution in grace observations and its leakage effect |
publisher |
Oxford University Press (OUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1093/gji/ggaa022 http://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggaa022/31788015/ggaa022.pdf http://academic.oup.com/gji/article-pdf/221/1/603/32510938/ggaa022.pdf |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
Geophysical Journal International volume 221, issue 1, page 603-616 ISSN 0956-540X 1365-246X |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/gji/ggaa022 |
container_title |
Geophysical Journal International |
container_volume |
221 |
container_issue |
1 |
container_start_page |
603 |
op_container_end_page |
616 |
_version_ |
1811635993450643456 |