Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect
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-...
Published in: | Geophysical Journal International |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press
|
Subjects: | |
Online Access: | http://hdl.handle.net/2115/80484 https://doi.org/10.1093/gji/ggaa022 |
id |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/80484 |
---|---|
record_format |
openpolar |
spelling |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/80484 2023-05-15T15:11:01+02:00 Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect Heki, Kosuke Yi, Shuang http://hdl.handle.net/2115/80484 https://doi.org/10.1093/gji/ggaa022 eng eng Oxford University Press http://hdl.handle.net/2115/80484 Geophysical Journal International, 221(1): 603-616 http://dx.doi.org/10.1093/gji/ggaa022 This article has been accepted for publication in Geophysical Journal International ©:2020 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Global change from geodesy Satellite gravity Sea level change Time variable gravity 450 article fthokunivhus https://doi.org/10.1093/gji/ggaa022 2022-11-18T01:06:16Z 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 Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Arctic Arctic Ocean Geophysical Journal International 221 1 603 616 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Global change from geodesy Satellite gravity Sea level change Time variable gravity 450 |
spellingShingle |
Global change from geodesy Satellite gravity Sea level change Time variable gravity 450 Heki, Kosuke Yi, Shuang Heterogeneous oceanic mass distribution in GRACE observations and its leakage effect |
topic_facet |
Global change from geodesy Satellite gravity Sea level change Time variable gravity 450 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Heki, Kosuke Yi, Shuang |
author_facet |
Heki, Kosuke Yi, Shuang |
author_sort |
Heki, Kosuke |
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 |
url |
http://hdl.handle.net/2115/80484 https://doi.org/10.1093/gji/ggaa022 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_relation |
http://hdl.handle.net/2115/80484 Geophysical Journal International, 221(1): 603-616 http://dx.doi.org/10.1093/gji/ggaa022 |
op_rights |
This article has been accepted for publication in Geophysical Journal International ©:2020 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
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_ |
1766341938631409664 |