Surface circulation characterization along the middle southern coastal region of Vietnam from high-frequency radar and numerical modeling
<p>Coastal water dynamics along the Vietnamese middle southern coast (VMSC) region, part of the South China Sea, are highly complex with large spatiotemporal variability whose drivers are not yet well understood. For the first time, high-resolution surface current data from high-frequency rada...
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Copernicus Publications
2025-01-01
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| Series: | Ocean Science |
| Online Access: | https://os.copernicus.org/articles/21/1/2025/os-21-1-2025.pdf |
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| author | T. H. Tran T. H. Tran A. Sentchev T. To Duy M. Herrmann S. Ouillon S. Ouillon K. C. Nguyen |
| author_facet | T. H. Tran T. H. Tran A. Sentchev T. To Duy M. Herrmann S. Ouillon S. Ouillon K. C. Nguyen |
| author_sort | T. H. Tran |
| collection | DOAJ |
| description | <p>Coastal water dynamics along the Vietnamese middle southern coast (VMSC) region, part of the South China Sea, are highly complex with large spatiotemporal variability whose drivers are not yet well understood. For the first time, high-resolution surface current data from high-frequency radar (HFR) measurements were obtained in this region during the early (transition) phase of the Asian summer monsoon. The data were used for comparison with simulation results from a circulation model, SYMPHONIE, and ultimately to optimize the wind forcing in the model. Both modeling and HFR were able to show the spatial and temporal evolution of the surface circulation, but some discrepancies were found between model and HFR data on some days, coinciding with the evolution of the wind. Two methods were used to optimize the wind forcing, namely the ensemble perturbation smoother (EnPS) and the wind correction method using wind-driven surface currents (EkW). Both methods achieved a significant reduction (<span class="inline-formula">∼</span> 36 %–40 %) in the error of the surface current velocity fields compared to the measured data. Optimized winds obtained from the two methods were compared with satellite wind data for validation. The results show that both optimization methods performed better in the far field, where topography no longer affects the coastal surface circulation. The optimization results revealed that the surface circulation is driven not only by winds but also by other factors such as intrinsic ocean variability, which is not entirely controlled by boundary conditions. This indicates the potential usefulness of large velocity datasets and other data fusion methods to effectively improve modeling results.</p> |
| format | Article |
| id | doaj-art-0387786d12aa4694bf001ffbb2df4d09 |
| institution | Kabale University |
| issn | 1812-0784 1812-0792 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Ocean Science |
| spelling | doaj-art-0387786d12aa4694bf001ffbb2df4d092025-01-07T14:56:41ZengCopernicus PublicationsOcean Science1812-07841812-07922025-01-012111810.5194/os-21-1-2025Surface circulation characterization along the middle southern coastal region of Vietnam from high-frequency radar and numerical modelingT. H. Tran0T. H. Tran1A. Sentchev2T. To Duy3M. Herrmann4S. Ouillon5S. Ouillon6K. C. Nguyen7Laboratory of Oceanology and Geosciences (LOG), UMR 8187, Univ. du Littoral Côte d'Opale, CNRS, Univ. Lille, IRD, Wimereux, FranceLand–Ocean–Atmosphere Regional Coupled System Study Center (LOTUS), University of Science and Technology of Hanoi (USTH), Hanoi, VietnamLaboratory of Oceanology and Geosciences (LOG), UMR 8187, Univ. du Littoral Côte d'Opale, CNRS, Univ. Lille, IRD, Wimereux, FranceInstitute of Oceanography, Vietnam Academy of Science and Technology (VAST), Nha Trang, VietnamLaboratory of Space Geophysical and Oceanographic Studies (LEGOS), UMR 5566, IRD, CNES, CNRS, UPS, Toulouse, FranceLand–Ocean–Atmosphere Regional Coupled System Study Center (LOTUS), University of Science and Technology of Hanoi (USTH), Hanoi, VietnamLaboratory of Space Geophysical and Oceanographic Studies (LEGOS), UMR 5566, IRD, CNES, CNRS, UPS, Toulouse, FranceDepartment of Marine Science and Technology, University of Science (HUS), Vietnam National University, Hanoi, Vietnam<p>Coastal water dynamics along the Vietnamese middle southern coast (VMSC) region, part of the South China Sea, are highly complex with large spatiotemporal variability whose drivers are not yet well understood. For the first time, high-resolution surface current data from high-frequency radar (HFR) measurements were obtained in this region during the early (transition) phase of the Asian summer monsoon. The data were used for comparison with simulation results from a circulation model, SYMPHONIE, and ultimately to optimize the wind forcing in the model. Both modeling and HFR were able to show the spatial and temporal evolution of the surface circulation, but some discrepancies were found between model and HFR data on some days, coinciding with the evolution of the wind. Two methods were used to optimize the wind forcing, namely the ensemble perturbation smoother (EnPS) and the wind correction method using wind-driven surface currents (EkW). Both methods achieved a significant reduction (<span class="inline-formula">∼</span> 36 %–40 %) in the error of the surface current velocity fields compared to the measured data. Optimized winds obtained from the two methods were compared with satellite wind data for validation. The results show that both optimization methods performed better in the far field, where topography no longer affects the coastal surface circulation. The optimization results revealed that the surface circulation is driven not only by winds but also by other factors such as intrinsic ocean variability, which is not entirely controlled by boundary conditions. This indicates the potential usefulness of large velocity datasets and other data fusion methods to effectively improve modeling results.</p>https://os.copernicus.org/articles/21/1/2025/os-21-1-2025.pdf |
| spellingShingle | T. H. Tran T. H. Tran A. Sentchev T. To Duy M. Herrmann S. Ouillon S. Ouillon K. C. Nguyen Surface circulation characterization along the middle southern coastal region of Vietnam from high-frequency radar and numerical modeling Ocean Science |
| title | Surface circulation characterization along the middle southern coastal region of Vietnam from high-frequency radar and numerical modeling |
| title_full | Surface circulation characterization along the middle southern coastal region of Vietnam from high-frequency radar and numerical modeling |
| title_fullStr | Surface circulation characterization along the middle southern coastal region of Vietnam from high-frequency radar and numerical modeling |
| title_full_unstemmed | Surface circulation characterization along the middle southern coastal region of Vietnam from high-frequency radar and numerical modeling |
| title_short | Surface circulation characterization along the middle southern coastal region of Vietnam from high-frequency radar and numerical modeling |
| title_sort | surface circulation characterization along the middle southern coastal region of vietnam from high frequency radar and numerical modeling |
| url | https://os.copernicus.org/articles/21/1/2025/os-21-1-2025.pdf |
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