Exploratory research on the retrieval of internal wave parameters and sea surface current velocity based on TerraSAR-X satellite data

Zeng Zhi; Li Xiaoming; Ren Yongzheng; Chen Xueen

doi:10.3969/j.issn.0253-4193.2020.01.010

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Zeng Zhi，Li Xiaoming，Ren Yongzheng, et al. Exploratory research on the retrieval of internal wave parameters and sea surface current velocity based on TerraSAR-X satellite data[J]. Haiyang Xuebao，2020, 42(1)：90–101，doi:10.3969/j.issn.0253−4193.2020.01.010

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Exploratory research on the retrieval of internal wave parameters and sea surface current velocity based on TerraSAR-X satellite data

doi: 10.3969/j.issn.0253-4193.2020.01.010

Zeng Zhi^1
,,
Li Xiaoming^{2, 3},
Ren Yongzheng^{3, 2},
Chen Xueen^{1
,
,}

1.
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
2.
Key Laboratory of Earth Observation of Hainan, Sanya 572029, China
3.
Key Laboratory of Digital Earth, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

Received Date: 2018-11-26
Rev Recd Date: 2019-02-26

Available Online: 2021-04-21

Publish Date: 2020-01-25

Abstract

Abstract

In this paper, we conducted a study on deriving internal wave parameters and sea surface current velocity in the vicinity of Dongsha Island from spaceborne SAR data of TerraSAR-X (TSX), acquired on April 22, 2010. Based on the intensity data of the TSX scene, characteristic half width of the internal wave was obtained through the empirical mode decomposition method. Then amplitude and phase speed of the internal solitary wave were calculated using the two-layer model method and the parameterization method, respectively. The results suggested that the amplitude (approximately 21–39 m) acquired by the parameterization method and the phase speed (approximately 1.06 m/s) obtained by the two-layer model method were consistent with the historical measurements. Furthermore, the Doppler velocity in the research area was calculated using along-track interferometry data of the TSX scene. The M4S model and the direct-separation method were used to extract the sea surface current velocity. The mean sea surface current field of the study area obtained by the two methods were consistent, which were both of approximately 1.10 m/s. The M4S model led to more adjustments to maximum of the surface velocity whereas more adjustments to the minimum values were found in the direct-separation method. Moreover, it was found that the adjustment of surface current retrieval using the M4S model were more in the region of wave crest of the internal waves. Finally, based on the KdV equation, the velocity of internal-wave-induced surface flow is about 0.28 m/s, which contributes 23% to the retrieved sea surface current velocity.
- internal solitary wave,
- South China Sea,
- synthetic aperture radar,
- along-track interferometry

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References

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