Combined Wind Vector and Sea State Impact on Ocean Nadir-Viewing Ku- and C-Band Radar Cross-Sections
The authors report the first results in studying the polarization anisotropy of themicrowave backscatter from nadir observations provided by Jason-1 altimeter in both Ku-and C-band. A small but clear wind direction signal for wind speeds above 6 m/s is revealed.These azimuthal variations of radar cr...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2006-03-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | http://www.mdpi.com/1424-8220/6/3/193/ |
| _version_ | 1798043711665340416 |
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| author | Bertrand Chapron Ngan Tran |
| author_facet | Bertrand Chapron Ngan Tran |
| author_sort | Bertrand Chapron |
| collection | DOAJ |
| description | The authors report the first results in studying the polarization anisotropy of themicrowave backscatter from nadir observations provided by Jason-1 altimeter in both Ku-and C-band. A small but clear wind direction signal for wind speeds above 6 m/s is revealed.These azimuthal variations of radar cross-section increase with increasing wind speed up to14 m/s. The signatures then level off at higher winds. These results extend, for the first time,recent theoretical improved scattering approximation, and point some similarities betweenscattering and emission mechanisms at nadir. The observed directional effect can thus beinterpreted as a signature of the curvature anisotropy of wind-generated short-scale waves.Sensitivities to both wind speed and sea state are also reported in the present analysis. |
| first_indexed | 2024-04-11T22:52:55Z |
| format | Article |
| id | doaj.art-b72c7eb69cce4b78b142d7a5a4da2d9d |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T22:52:55Z |
| publishDate | 2006-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-b72c7eb69cce4b78b142d7a5a4da2d9d2022-12-22T03:58:32ZengMDPI AGSensors1424-82202006-03-016319320710.3390/s6030193Combined Wind Vector and Sea State Impact on Ocean Nadir-Viewing Ku- and C-Band Radar Cross-SectionsBertrand ChapronNgan TranThe authors report the first results in studying the polarization anisotropy of themicrowave backscatter from nadir observations provided by Jason-1 altimeter in both Ku-and C-band. A small but clear wind direction signal for wind speeds above 6 m/s is revealed.These azimuthal variations of radar cross-section increase with increasing wind speed up to14 m/s. The signatures then level off at higher winds. These results extend, for the first time,recent theoretical improved scattering approximation, and point some similarities betweenscattering and emission mechanisms at nadir. The observed directional effect can thus beinterpreted as a signature of the curvature anisotropy of wind-generated short-scale waves.Sensitivities to both wind speed and sea state are also reported in the present analysis.http://www.mdpi.com/1424-8220/6/3/193/Altimeterradar cross sectionpolarizationwind directionsea state. |
| spellingShingle | Bertrand Chapron Ngan Tran Combined Wind Vector and Sea State Impact on Ocean Nadir-Viewing Ku- and C-Band Radar Cross-Sections Sensors Altimeter radar cross section polarization wind direction sea state. |
| title | Combined Wind Vector and Sea State Impact on Ocean Nadir-Viewing Ku- and C-Band Radar Cross-Sections |
| title_full | Combined Wind Vector and Sea State Impact on Ocean Nadir-Viewing Ku- and C-Band Radar Cross-Sections |
| title_fullStr | Combined Wind Vector and Sea State Impact on Ocean Nadir-Viewing Ku- and C-Band Radar Cross-Sections |
| title_full_unstemmed | Combined Wind Vector and Sea State Impact on Ocean Nadir-Viewing Ku- and C-Band Radar Cross-Sections |
| title_short | Combined Wind Vector and Sea State Impact on Ocean Nadir-Viewing Ku- and C-Band Radar Cross-Sections |
| title_sort | combined wind vector and sea state impact on ocean nadir viewing ku and c band radar cross sections |
| topic | Altimeter radar cross section polarization wind direction sea state. |
| url | http://www.mdpi.com/1424-8220/6/3/193/ |
| work_keys_str_mv | AT bertrandchapron combinedwindvectorandseastateimpactonoceannadirviewingkuandcbandradarcrosssections AT ngantran combinedwindvectorandseastateimpactonoceannadirviewingkuandcbandradarcrosssections |