| WANG Lihua,ZHOU Yunxuan,GE Jianzhong,JOHANNESSEN Johnny A.,SHEN Fang. 2014. Mapping sea surface velocities in the Changjiang coastal zone with advanced synthetic aperture radar. Acta Oceanologica Sinica, 33(11):141－149 |
| Mapping sea surface velocities in the Changjiang coastal zone with advanced synthetic aperture radar |
| 基于合成孔径雷达的长江口海表流场反演 |
| Received:February 24, 2014 Revised:March 20, 2014 |
| DOI：10.1007/s13131-014-0563-x |
| Key words:advanced synthetic aperture radar Changjiang coast Doppler centroid anomaly range Doppler velocity finite volume coastal ocean model |
| 中文关键词: 合成孔径雷达 长江口 多普勒质心异常 径向多普勒速率 FVCOM |
| 基金项目: |
| Author Name | Affiliation | E-mail | | WANG Lihua | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | | | ZHOU Yunxuan | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | zhouyx@sklec.ecnu.edu.cn | | GE Jianzhong | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | | | JOHANNESSEN Johnny A. | Nansen Environmental and Remote Sensing Center, Bergen 5006, Norway
Geophysical Institute, University of Bergen, Bergen 5006, Norway | | | SHEN Fang | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | |
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| Abstract: |
| Range Doppler velocities derived from the Envisat advanced synthetic aperture radar (ASAR) wide swath images are analyzed and assessed against the numerically simulated surface current fields derived from the finite volume coastal ocean model (FVCOM) for the Changjiang Estuary. Comparisons with the FVCOM simulations show that the European Space Agency (ESA) Envisat ASAR based Doppler shift anomaly retrievals have the capability to capture quantitative information of the surface currents in the Changjiang Estuary. The uncertainty analysis of the ASAR range Doppler velocity estimates are discussed with regard to the azimuthal and range bias corrections, radar incidence angles, inaccuracy in the wind field corrections and the presence of rain cells.The corrected range Doppler velocities for the Changjiang Estuary area are highly valuable as they exhibit quantitative expressions related to the multiscale upper layer dynamics and surface current variability around the East China Sea, including the Changjiang Estuary. |
| 中文摘要: |
| 依据多普勒质心频移理论, 综合分析和讨论了Envisat ASAR WSM影像用于海表流场反演的机理和方法。选取长江口及邻近海域为研究实例, 将ASAR WSM反演的海表流场与经过大量实测数据验证和率定的数值模拟FVCOM模型模拟结果进行对比, 显示吻合较好, 表明ASAR多普勒频率异常是一种有效的提取定量海表流场信息的技术方法。进一步定性定量地评价了雷达后向散射强度在方位向的剧烈梯度变化、低入射角、不精确的海表风矢量和雨的出现对ASAR反演海表流场产生的不确定性。长江口及邻近海域ASAR影像海表多普勒流场能够反映局部的海洋环境状况, 可为海洋数值模拟模型等提供精确的空间信息, 对于揭示中国东海海域多尺度的海洋动态至关重要。 |
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