Investigation of the Anisotropic Patterns in the Altimeter Backscatter Measurements Over Ocean Wave Surfaces
Investigation of the Anisotropic Patterns in the Altimeter Backscatter Measurements Over Ocean Wave Surfaces
复制标题
海浪表面高度计反向散射测量中各向异性模式的研究
DOI：
10.3389/feart.2021.731610
复制
发表时间：
2021-10
影响因子：
2.9
通讯作者：
Lingwei Shi
中科院分区：
文献类型：
--
作者：
Xi-Yu Xu;Ke Xu;Maofei Jiang;Bingxu Geng;Lingwei Shi
本文试图分析海浪表面的各向异性效应对 SAR 测高反向散射系数 (Sigma-0) 测量的影响，这一点在出版物中尚未得到深入讨论。分析了WW3数值波浪模型分配的Sentinel-3A、Cryosat-2和Jason-3高度计的数据，并在~2m有效波高下获得了Sigma-0相对于波浪方向的模式。将海浪分为六类，其中对中等涌浪和短赢浪情况进行了集中分析。与风浪主导的海洋表面相比，涌浪主导的海洋表面显示出更少的随机性。对于中等膨胀情况，在 Sentinel-3A 高度计的两种操作模式（SAR 模式和 PLRM 模式）的 Sigma-0 和 SSB 模式中发现了清晰且显着的正弦曲线趋势，表明 Sigma-0 和 SSB 测量对高度计测量的各向异性特征的敏感性。 Sentinel-3A PLRM Sigma-0 中的各向异性模式有些违反直觉，但对 Jason-3 高度计数据的分析会显示类似的结果。此外，通过比较两个正交偏振SAR高度计（Sentinel-3A和Cryosat-2）的各向异性模式，我们可以得出结论：Sigma-0测量对偏振模式不敏感。至于 SSHA 模式，无法识别出中度膨胀的清晰正弦曲线。一种可能的解释是，SSB 模式可能会被影响 SSHA 模式的复杂因素所淹没。
This article attempts to analyze the influence of the anisotropic effects of the ocean wave surface on SAR altimetry backscatter coefficient (Sigma-0) measurements, which has not been intensively addressed in publications. Data of Sentinel-3A, Cryosat-2, and Jason-3 altimeters allocated by the WW3 numeric wave model were analyzed, and the patterns of Sigma-0 with respect to the wave direction were acquired under ∼2m significant wave height. The ocean waves were classified into six categories, among which the moderate swell and short win-wave cases were analyzed intensively. Swell-dominated ocean surface shows less randomness than the wind-wave-dominated ocean surface. Clear and significant sinusoid trends are found in the Sigma-0 and SSB patterns of both operational modes (SAR mode and PLRM mode) of the Sentinel-3A altimeter for the moderate swell case, indicating the sensitivity of Sigma-0 and SSB measurements to the anisotropic features of the altimeter measurements. The anisotropic pattern in the Sentinel-3A PLRM Sigma-0 is somewhat counterintuitive, but the analysis of Jason-3 altimeter data would show similar results. Additionally, by comparing the anisotropic patterns of two orthogonally polarized SAR altimeters (Sentinel-3A and Cryosat-2), we could draw the conclusion that the Sigma-0 measurements are not sensitive to the polarization mode. As for the SSHA patterns, no clear sinusoid could be identified for the moderate swell. A possible explanation is that the SSB pattern may be overwhelmed in the complicated factors that can influence the SSHA pattern.
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DOI：
10.5194/hessd-11-2825-2014
发表时间：
2014
期刊：
--
影响因子：
--
作者：
Y. B. Sulistioadi;K. Tseng;C. Shum;H. Hidayat;M. Sumaryono;A. Suhardiman;F. Setiawan;S. Sunarso
通讯作者：
Y. B. Sulistioadi;K. Tseng;C. Shum;H. Hidayat;M. Sumaryono;A. Suhardiman;F. Setiawan;S. Sunarso
影响因子：
2.2
作者：
J. Nystuen
通讯作者：
J. Nystuen
DOI：
--
发表时间：
2007
期刊：
--
影响因子：
--
作者：
B. Tracy;E. Devaliere;J. Hanson
通讯作者：
B. Tracy;E. Devaliere;J. Hanson
影响因子：
2.6
作者：
Bouffard, Jerome;Naeije, Marc;Parrinello, Tommaso
通讯作者：
Parrinello, Tommaso
影响因子：
--
作者：
L. Fu;R. Glazman
通讯作者：
L. Fu;R. Glazman