A joint method to retrieve directional ocean wave spectra from SAR and wave spectrometer data

Lin Ren; Jingsong Yang; Gang Zheng; Juan Wang

doi:10.1007/s00343-015-5043-4

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A joint method to retrieve directional ocean wave spectra from SAR and wave spectrometer data

Updated：2023-05-16

- A joint method to retrieve directional ocean wave spectra from SAR and wave spectrometer data
- Journal of Oceanology and Limnology Vol. 34, Issue 4, Pages: 847-858(2016)
- Affiliations：
  
  State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography State Oceanic Administration
- Author bio：
- Funds：
- DOI：10.1007/s00343-015-5043-4
  CLC：
- Online First：19 November 2015，
  
  Published：2016
- Accepted：
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Ren, L., Yang, J., Zheng, G. et al. A joint method to retrieve directional ocean wave spectra from SAR and wave spectrometer data., Chin. J. Ocean. Limnol. 34, 847–858 (2016). https://doi.org/10.1007/s00343-015-5043-4
DOI：

Ren, L., Yang, J., Zheng, G. et al. A joint method to retrieve directional ocean wave spectra from SAR and wave spectrometer data., Chin. J. Ocean. Limnol. 34, 847–858 (2016). https://doi.org/10.1007/s00343-015-5043-4 DOI：

摘要

Abstract

This paper proposes a joint method to simultaneously retrieve wave spectra at different scales from spaceborne Synthetic Aperture Radar (SAR) and wave spectrometer data. The method combines the output from the two different sensors to overcome retrieval limitations that occur in some sea states. The wave spectrometer sensitivity coefficient is estimated using an effective significant wave height (SWH)

which is an average of SAR-derived and wave spectrometer-derived SWH. This averaging extends the area of the sea surface sampled by the nadir beam of the wave spectrometer to improve the accuracy of the estimated sensitivity coefficient in inhomogeneous sea states. Wave spectra are then retrieved from SAR data using wave spectrometer-derived spectra as first guess spectra to complement the short waves lost in SAR data retrieval. In addition

the problem of 180° ambiguity in retrieved spectra is overcome using SAR imaginary cross spectra. Simulated data were used to validate the joint method. The simulations demonstrated that retrieved wave parameters

including SWH

peak wave length (PWL)

and peak wave direction (PWD)

agree well with reference parameters. Collocated data from ENVISAT advanced SAR (ASAR)

the airborne wave spectrometer STORM

the PHAROS buoy

and the European Centre for Medium-Range Weather Forecasting (ECMWF) were then used to verify the proposed method. Wave parameters retrieved from STORM and two ASAR images were compared to buoy and ECMWF wave data. Most of the retrieved parameters were comparable to reference parameters. The results of this study show that the proposed joint retrieval method could be a valuable complement to traditional methods used to retrieve directional ocean wave spectra

particularly in inhomogeneous sea states.

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references

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