Advances in surface water and ocean topography for fine-scale eddy identification from altimeter sea surface height merging maps in the South China Sea
<p>The recently launched Surface Water and Ocean Topography (SWOT) satellite mission has reduced the noise levels and increased resolution, thereby improving the ability to detect previously unobserved fine-scale signals. We employed a method to utilize the unique and advanced abilities of SWO...
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Copernicus Publications
2025-06-01
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| Series: | Ocean Science |
| Online Access: | https://os.copernicus.org/articles/21/1033/2025/os-21-1033-2025.pdf |
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| author | X. Zhang X. Zhang L. Liu L. Liu J. Fei Z. Li Z. Wei Z. Zhang X. Jiang Z. Dong F. Xu |
| author_facet | X. Zhang X. Zhang L. Liu L. Liu J. Fei Z. Li Z. Wei Z. Zhang X. Jiang Z. Dong F. Xu |
| author_sort | X. Zhang |
| collection | DOAJ |
| description | <p>The recently launched Surface Water and Ocean Topography (SWOT) satellite mission has reduced the noise levels and increased resolution, thereby improving the ability to detect previously unobserved fine-scale signals. We employed a method to utilize the unique and advanced abilities of SWOT to validate the accuracy of identified eddies in merged maps of a widely used Archiving, Validation, and Interpretation of Satellite Oceanographic (AVISO) data product and a newly implemented two-dimensional variational method (2DVAR), which uses a <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><mn mathvariant="normal">1</mn><mo>/</mo><mn mathvariant="normal">12</mn></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="27pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="8a0d874c25b46a170197f53c65b5ab3f"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="os-21-1033-2025-ie00001.svg" width="27pt" height="14pt" src="os-21-1033-2025-ie00001.png"/></svg:svg></span></span>° grid and reduces decorrelation of spatial length scales. SWOT data are more likely to provide detailed comparisons of eddy boundaries for fine-scale to mesoscale structures compared with conventional in situ data (e.g., drifting buoys). The validation results demonstrate that, compared with AVISO, the 2DVAR method exhibited greater consistency with the SWOT observations, especially at small scales, confirming the accuracy and ability of the 2DVAR method in the reconstruction and resolution of fine-scale oceanic dynamical structures.</p> |
| format | Article |
| id | doaj-art-66e208a8d2c94ff4b9707867ef6d309f |
| institution | DOAJ |
| issn | 1812-0784 1812-0792 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Copernicus Publications |
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| series | Ocean Science |
| spelling | doaj-art-66e208a8d2c94ff4b9707867ef6d309f2025-08-20T03:21:22ZengCopernicus PublicationsOcean Science1812-07841812-07922025-06-01211033104510.5194/os-21-1033-2025Advances in surface water and ocean topography for fine-scale eddy identification from altimeter sea surface height merging maps in the South China SeaX. Zhang0X. Zhang1L. Liu2L. Liu3J. Fei4Z. Li5Z. Wei6Z. Zhang7X. Jiang8Z. Dong9F. Xu10College of Meteorology and Oceanology, National University of Defense Technology, Changsha 410073, ChinaKey Laboratory of High Impact Weather (special), China Meteorological Administration, Changsha 410073, ChinaCollege of Meteorology and Oceanology, National University of Defense Technology, Changsha 410073, ChinaKey Laboratory of High Impact Weather (special), China Meteorological Administration, Changsha 410073, ChinaCollege of Meteorology and Oceanology, National University of Defense Technology, Changsha 410073, ChinaDepartment of Atmosphere and Ocean Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai 200433, ChinaFirst Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, ChinaFrontier Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Physical Oceanography Laboratory/Key Laboratory of Ocean Observation and Information of Hainan Province, Sanya Oceanographic Institution, Ocean University of China, Qingdao/Sanya, ChinaDepartment of Atmosphere and Ocean Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai 200433, ChinaCollege of Meteorology and Oceanology, National University of Defense Technology, Changsha 410073, ChinaCollege of Meteorology and Oceanology, National University of Defense Technology, Changsha 410073, China<p>The recently launched Surface Water and Ocean Topography (SWOT) satellite mission has reduced the noise levels and increased resolution, thereby improving the ability to detect previously unobserved fine-scale signals. We employed a method to utilize the unique and advanced abilities of SWOT to validate the accuracy of identified eddies in merged maps of a widely used Archiving, Validation, and Interpretation of Satellite Oceanographic (AVISO) data product and a newly implemented two-dimensional variational method (2DVAR), which uses a <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><mn mathvariant="normal">1</mn><mo>/</mo><mn mathvariant="normal">12</mn></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="27pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="8a0d874c25b46a170197f53c65b5ab3f"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="os-21-1033-2025-ie00001.svg" width="27pt" height="14pt" src="os-21-1033-2025-ie00001.png"/></svg:svg></span></span>° grid and reduces decorrelation of spatial length scales. SWOT data are more likely to provide detailed comparisons of eddy boundaries for fine-scale to mesoscale structures compared with conventional in situ data (e.g., drifting buoys). The validation results demonstrate that, compared with AVISO, the 2DVAR method exhibited greater consistency with the SWOT observations, especially at small scales, confirming the accuracy and ability of the 2DVAR method in the reconstruction and resolution of fine-scale oceanic dynamical structures.</p>https://os.copernicus.org/articles/21/1033/2025/os-21-1033-2025.pdf |
| spellingShingle | X. Zhang X. Zhang L. Liu L. Liu J. Fei Z. Li Z. Wei Z. Zhang X. Jiang Z. Dong F. Xu Advances in surface water and ocean topography for fine-scale eddy identification from altimeter sea surface height merging maps in the South China Sea Ocean Science |
| title | Advances in surface water and ocean topography for fine-scale eddy identification from altimeter sea surface height merging maps in the South China Sea |
| title_full | Advances in surface water and ocean topography for fine-scale eddy identification from altimeter sea surface height merging maps in the South China Sea |
| title_fullStr | Advances in surface water and ocean topography for fine-scale eddy identification from altimeter sea surface height merging maps in the South China Sea |
| title_full_unstemmed | Advances in surface water and ocean topography for fine-scale eddy identification from altimeter sea surface height merging maps in the South China Sea |
| title_short | Advances in surface water and ocean topography for fine-scale eddy identification from altimeter sea surface height merging maps in the South China Sea |
| title_sort | advances in surface water and ocean topography for fine scale eddy identification from altimeter sea surface height merging maps in the south china sea |
| url | https://os.copernicus.org/articles/21/1033/2025/os-21-1033-2025.pdf |
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