Mapping Radial Ocean Surface Currents in the Outer Core of Hurricane Maria From Synthetic Aperture Radar Doppler Measurements
Spaceborne synthetic aperture radar (SAR) Doppler shift measurements have been used for remote sensing of ocean surface currents during nonstorm events. However, mapping strong currents under storm conditions is still a challenging and unsolved issue. In this study, we attempt to retrieve radial cur...
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| Format: | Article |
| Language: | English |
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IEEE
2024-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10365489/ |
| _version_ | 1797370476846120960 |
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| author | Shengren Fan Biao Zhang Vladimir Kudryavtsev William Perrie |
| author_facet | Shengren Fan Biao Zhang Vladimir Kudryavtsev William Perrie |
| author_sort | Shengren Fan |
| collection | DOAJ |
| description | Spaceborne synthetic aperture radar (SAR) Doppler shift measurements have been used for remote sensing of ocean surface currents during nonstorm events. However, mapping strong currents under storm conditions is still a challenging and unsolved issue. In this study, we attempt to retrieve radial current velocities from Sentinel-1A SAR Doppler shifts acquired over the outer core regions of Hurricane Maria for the first time. In these areas, the maximum wind speed is 28.7 m/s. Doppler shifts arising from the scalloping effect are first calculated using a linear fitting method. The nonzero Doppler shift measurements over the land within SAR scenes are then used to estimate Doppler shifts caused by antenna electronic mispointing and residual error. Finally, we compute sea-state-induced Doppler shifts (wave Doppler) based on our recently dual copolarization Doppler velocity (DPDop) model. The retrieved radial current velocities are compared with collocated high-frequency radar measurements, and show a bias of 0.02 m/s and a root-mean-square error of 0.19 m/s. These results suggest that it is possible to retrieve reliable radial current velocities under high wind conditions, as the contributions of nongeophysical terms and sea state to the Doppler shifts can be accurately estimated and removed. |
| first_indexed | 2024-03-08T18:03:09Z |
| format | Article |
| id | doaj.art-3369317eb6444ad496cbade5a3839297 |
| institution | Directory Open Access Journal |
| issn | 2151-1535 |
| language | English |
| last_indexed | 2024-03-08T18:03:09Z |
| publishDate | 2024-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj.art-3369317eb6444ad496cbade5a38392972024-01-02T00:00:44ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing2151-15352024-01-01172090209710.1109/JSTARS.2023.334459110365489Mapping Radial Ocean Surface Currents in the Outer Core of Hurricane Maria From Synthetic Aperture Radar Doppler MeasurementsShengren Fan0https://orcid.org/0000-0002-6656-9940Biao Zhang1https://orcid.org/0000-0001-6569-1998Vladimir Kudryavtsev2https://orcid.org/0000-0002-8545-1761William Perrie3https://orcid.org/0000-0002-3598-2791School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, ChinaSchool of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, ChinaSatellite Oceanography Laboratory, Russian State Hydrometeorological University, St. Petersburg, RussiaFisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, CanadaSpaceborne synthetic aperture radar (SAR) Doppler shift measurements have been used for remote sensing of ocean surface currents during nonstorm events. However, mapping strong currents under storm conditions is still a challenging and unsolved issue. In this study, we attempt to retrieve radial current velocities from Sentinel-1A SAR Doppler shifts acquired over the outer core regions of Hurricane Maria for the first time. In these areas, the maximum wind speed is 28.7 m/s. Doppler shifts arising from the scalloping effect are first calculated using a linear fitting method. The nonzero Doppler shift measurements over the land within SAR scenes are then used to estimate Doppler shifts caused by antenna electronic mispointing and residual error. Finally, we compute sea-state-induced Doppler shifts (wave Doppler) based on our recently dual copolarization Doppler velocity (DPDop) model. The retrieved radial current velocities are compared with collocated high-frequency radar measurements, and show a bias of 0.02 m/s and a root-mean-square error of 0.19 m/s. These results suggest that it is possible to retrieve reliable radial current velocities under high wind conditions, as the contributions of nongeophysical terms and sea state to the Doppler shifts can be accurately estimated and removed.https://ieeexplore.ieee.org/document/10365489/Doppler shifthurricaneocean surface current (OSC)synthetic aperture radar (SAR) |
| spellingShingle | Shengren Fan Biao Zhang Vladimir Kudryavtsev William Perrie Mapping Radial Ocean Surface Currents in the Outer Core of Hurricane Maria From Synthetic Aperture Radar Doppler Measurements IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Doppler shift hurricane ocean surface current (OSC) synthetic aperture radar (SAR) |
| title | Mapping Radial Ocean Surface Currents in the Outer Core of Hurricane Maria From Synthetic Aperture Radar Doppler Measurements |
| title_full | Mapping Radial Ocean Surface Currents in the Outer Core of Hurricane Maria From Synthetic Aperture Radar Doppler Measurements |
| title_fullStr | Mapping Radial Ocean Surface Currents in the Outer Core of Hurricane Maria From Synthetic Aperture Radar Doppler Measurements |
| title_full_unstemmed | Mapping Radial Ocean Surface Currents in the Outer Core of Hurricane Maria From Synthetic Aperture Radar Doppler Measurements |
| title_short | Mapping Radial Ocean Surface Currents in the Outer Core of Hurricane Maria From Synthetic Aperture Radar Doppler Measurements |
| title_sort | mapping radial ocean surface currents in the outer core of hurricane maria from synthetic aperture radar doppler measurements |
| topic | Doppler shift hurricane ocean surface current (OSC) synthetic aperture radar (SAR) |
| url | https://ieeexplore.ieee.org/document/10365489/ |
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