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Analysis of waves observed by synthetic aperture radar across ocean fronts

机译：跨越海滨合成孔径雷达观察的波浪分析

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摘要

In this study, synthetic aperture radar (SAR) imaging of waves across ocean fronts was investigated using C-band Sentinel-1 VV-polarized SAR imagery collected over the Yangtze and the Zhujiang estuaries. The presence of ocean fronts in the study area was confirmed by collocated sea surface temperature (SST) data provided by the Advanced Very High Resolution Radiometer (AVHRR) and sea surface current information from the National Ocean Partnership Program (NOPP) based on the HYbrid Coordinate Ocean Model (HYCOM). The experimental results revealed that as the current speed increased, the cut-off wavelength (λ_c) increased as well. The effect of the increasing azimuth cut-off wavelength, however, was relatively weak in terms of variations of the normalized radar cross-section (NRCS), i.e., it was within 2 dB for λ_c < 60 m. Hence, it was weaker than the NRCS variation related to SST. Larger NRCS variations (i.e., within 5 dB) occurred for λ_c values up to 120 m. In addition, the experimental results also demonstrated that the parameterized first-guess spectrum method (PFSM) wave retrieval performance was affected by ocean fronts. In particular, overestimations occurred when ocean fronts were present and λ_c was < 100 m.
机译：在这项研究中，使用在长江和珠江河口上收集的C波段哨声-1 VV极化SAR图像来研究跨越海滨的波浪的合成孔径雷达（SAR）成像。通过基于混合坐标的国家海洋伙伴关系计划（NOPP）的先进的非常高分辨率辐射计（AVHRR）和海面电流信息，通过由国家海洋伙伴关系计划（NOPP）提供的搭配海表面温度（SST）数据确认了研究区的海洋前线的存在海洋模型（Hycom）。实验结果表明，随着电流速度的增加，切断波长（λ_c）也增加。然而，就标准化雷达横截面（NRC）的变化而言，增加方位角截止波长的效果相对较弱，即，在λ_c<60μm的2 dB内。因此，它比与SST相关的NRC变异较弱。 λ_c值高达120米的λ_c值发生较大的nrcs变化（即5 dB内）。此外，实验结果还证明参数化的第一猜测频谱法（PFSM）波检索性能受到海洋前线的影响。特别是，当存在海洋前线并且λ_c<100米时发生高估计。

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  • 来源
    《Ocean Dynamics》 |2020年第11期|1397-1407|共11页
  • 作者

    Weizeng Shao; Xingwei Jiang; Ferdinando Nunziata; Armando Marino; Zhehao Yang; Youguang Zhang; Valeria Corcione;

  • 作者单位

    National Satellite Ocean Application Service Beijing 100081 China Marine Science and Technology College Zhejiang Ocean University Zhoushan 316000 China Key Laboratory of Space Ocean Remote Sensing and Application Ministry of Natural Resources of the People's Republic of China Beijing 100081 China;

    National Satellite Ocean Application Service Beijing 100081 China Key Laboratory of Space Ocean Remote Sensing and Application Ministry of Natural Resources of the People's Republic of China Beijing 100081 China;

    Dipartimento di Ingegneria Universita degli Studi di Napoli Parthenope 80133 Naples Italy;

    Natural Sciences University of Stirling Stirling FK9 4LA UK;

    Marine Science and Technology College Zhejiang Ocean University Zhoushan 316000 China;

    National Satellite Ocean Application Service Beijing 100081 China Key Laboratory of Space Ocean Remote Sensing and Application Ministry of Natural Resources of the People's Republic of China Beijing 100081 China;

    Dipartimento di Ingegneria Universita degli Studi di Napoli Parthenope 80133 Naples Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Wave; Ocean front; Synthetic aperture radar;

    机译：海浪;海洋前线;合成孔径雷达;

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