SDUST2020MGCR: a global marine gravity change rate model determined from multi-satellite altimeter data
Investigating the global time-varying gravity field mainly depends on GRACE/GRACE-FO gravity data. However, satellite gravity data exhibit low spatial resolution and signal distortion. Satellite altimetry is an important technique for observing the global ocean and provides many consecutive years of...
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ftcopernicus:oai:publications.copernicus.org:essd116339 2024-06-23T07:53:24+00:00 SDUST2020MGCR: a global marine gravity change rate model determined from multi-satellite altimeter data Zhu, Fengshun Guo, Jinyun Zhang, Huiying Huang, Lingyong Sun, Heping Liu, Xin 2024-05-06 application/pdf https://doi.org/10.5194/essd-16-2281-2024 https://essd.copernicus.org/articles/16/2281/2024/ eng eng doi:10.5194/essd-16-2281-2024 https://essd.copernicus.org/articles/16/2281/2024/ eISSN: 1866-3516 Text 2024 ftcopernicus https://doi.org/10.5194/essd-16-2281-2024 2024-06-13T01:24:45Z Investigating the global time-varying gravity field mainly depends on GRACE/GRACE-FO gravity data. However, satellite gravity data exhibit low spatial resolution and signal distortion. Satellite altimetry is an important technique for observing the global ocean and provides many consecutive years of data, which enables the study of high-resolution marine gravity variations. This study aims to construct a high-resolution marine gravity change rate (MGCR) model using multi-satellite altimetry data. Initially, multi-satellite altimetry data and ocean temperature–salinity data from 1993 to 2019 are utilized to estimate the altimetry sea level change rate (SLCR) and steric SLCR, respectively. Subsequently, the mass-term SLCR is calculated. Finally, based on the mass-term SLCR, the global MGCR model on 5 ′ × 5 ′ grids (SDUST2020MGCR) is constructed by applying the spherical harmonic function method and mass load theory. Comparisons and analyses are conducted between SDUST2020MGCR and GRACE2020MGCR resolved from GRACE/GRACE-FO gravity data. The spatial distribution characteristics of SDUST2020MGCR and GRACE2020MGCR are similar in the sea areas where gravity changes significantly, such as the eastern seas of Japan, the western seas of the Nicobar Islands, and the southern seas of Greenland. The statistical mean values of SDUST2020MGCR and GRACE2020MGCR in global and local oceans are all positive, indicating that MGCR is rising. Nonetheless, differences in spatial distribution and statistical results exist between SDUST2020MGCR and GRACE2020MGCR, primarily attributable to spatial resolution disparities among altimetry data, ocean temperature–salinity data, and GRACE/GRACE-FO data. Compared with GRACE2020MGCR, SDUST2020MGCR has higher spatial resolution and excludes stripe noise and leakage errors. The high-resolution MGCR model constructed using altimetry data can reflect the long-term marine gravity change in more detail, which is helpful in studying seawater mass migration and its associated geophysical processes. The ... Text Greenland Copernicus Publications: E-Journals Greenland Stripe ENVELOPE(9.914,9.914,63.019,63.019) Earth System Science Data 16 5 2281 2296 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
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Investigating the global time-varying gravity field mainly depends on GRACE/GRACE-FO gravity data. However, satellite gravity data exhibit low spatial resolution and signal distortion. Satellite altimetry is an important technique for observing the global ocean and provides many consecutive years of data, which enables the study of high-resolution marine gravity variations. This study aims to construct a high-resolution marine gravity change rate (MGCR) model using multi-satellite altimetry data. Initially, multi-satellite altimetry data and ocean temperature–salinity data from 1993 to 2019 are utilized to estimate the altimetry sea level change rate (SLCR) and steric SLCR, respectively. Subsequently, the mass-term SLCR is calculated. Finally, based on the mass-term SLCR, the global MGCR model on 5 ′ × 5 ′ grids (SDUST2020MGCR) is constructed by applying the spherical harmonic function method and mass load theory. Comparisons and analyses are conducted between SDUST2020MGCR and GRACE2020MGCR resolved from GRACE/GRACE-FO gravity data. The spatial distribution characteristics of SDUST2020MGCR and GRACE2020MGCR are similar in the sea areas where gravity changes significantly, such as the eastern seas of Japan, the western seas of the Nicobar Islands, and the southern seas of Greenland. The statistical mean values of SDUST2020MGCR and GRACE2020MGCR in global and local oceans are all positive, indicating that MGCR is rising. Nonetheless, differences in spatial distribution and statistical results exist between SDUST2020MGCR and GRACE2020MGCR, primarily attributable to spatial resolution disparities among altimetry data, ocean temperature–salinity data, and GRACE/GRACE-FO data. Compared with GRACE2020MGCR, SDUST2020MGCR has higher spatial resolution and excludes stripe noise and leakage errors. The high-resolution MGCR model constructed using altimetry data can reflect the long-term marine gravity change in more detail, which is helpful in studying seawater mass migration and its associated geophysical processes. The ... |
format |
Text |
author |
Zhu, Fengshun Guo, Jinyun Zhang, Huiying Huang, Lingyong Sun, Heping Liu, Xin |
spellingShingle |
Zhu, Fengshun Guo, Jinyun Zhang, Huiying Huang, Lingyong Sun, Heping Liu, Xin SDUST2020MGCR: a global marine gravity change rate model determined from multi-satellite altimeter data |
author_facet |
Zhu, Fengshun Guo, Jinyun Zhang, Huiying Huang, Lingyong Sun, Heping Liu, Xin |
author_sort |
Zhu, Fengshun |
title |
SDUST2020MGCR: a global marine gravity change rate model determined from multi-satellite altimeter data |
title_short |
SDUST2020MGCR: a global marine gravity change rate model determined from multi-satellite altimeter data |
title_full |
SDUST2020MGCR: a global marine gravity change rate model determined from multi-satellite altimeter data |
title_fullStr |
SDUST2020MGCR: a global marine gravity change rate model determined from multi-satellite altimeter data |
title_full_unstemmed |
SDUST2020MGCR: a global marine gravity change rate model determined from multi-satellite altimeter data |
title_sort |
sdust2020mgcr: a global marine gravity change rate model determined from multi-satellite altimeter data |
publishDate |
2024 |
url |
https://doi.org/10.5194/essd-16-2281-2024 https://essd.copernicus.org/articles/16/2281/2024/ |
long_lat |
ENVELOPE(9.914,9.914,63.019,63.019) |
geographic |
Greenland Stripe |
geographic_facet |
Greenland Stripe |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
eISSN: 1866-3516 |
op_relation |
doi:10.5194/essd-16-2281-2024 https://essd.copernicus.org/articles/16/2281/2024/ |
op_doi |
https://doi.org/10.5194/essd-16-2281-2024 |
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Earth System Science Data |
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