| FAN Zhisong,ZHANG Yuanling,SONG Mei. 2008. A study of SAR remote sensing of internal solitary waves in the north of the South China Sea: Ⅱ. Simulation of SAR signatures of internal solitary waves. Acta Oceanologica Sinica, (5):36－48 |
| A study of SAR remote sensing of internal solitary waves in the north of the South China Sea: Ⅱ. Simulation of SAR signatures of internal solitary waves |
| A study of SAR remote sensing of internal solitary waves in the north of the South China Sea: Ⅱ. Simulation of SAR signatures of internal solitary waves |
| Received:July 23, 2007 Revised:December 09, 2007 |
| DOI： |
| Key words:internal tide internal solitary waves turbulence SAR remote sensing |
| 中文关键词: internal tide internal solitary waves turbulence SAR remote sensing |
| 基金项目:The National High Technology Research and Development Project ("863" Program) of China under contract No. 2002AA633120;The National Natural Science Foundation of China under contract No. 40706055. |
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| Abstract: |
| A new model developed from the full-spectrum model of Lyzenga and Bennett (1988) is built up by us preliminarily through considering the impact of the ocean surface mixed layer turbulence on SAR remote sensing of internal solitary waves. In the partial differential equation of the action spectral density of the surface gravity-capillary waves the source function representing the contribution of the turbulence is added besides the usual source function representing the contribution of the wind. The source function is determined by applying the k-ε model and adopting the Nasmyth spectrum of oceanic turbulence (Nasmyth, 1970; Oakey, 1982; Fan, 2002) on the basis of the previous simulation results of internal tide transformation obtained in the companion paper (Fan et al.,2008). Either under relatively high wind speed, or under low wind speed, our model predicts significant large modulations of radar backscatter at all three bands (L, C and X bands) for both VV and HH polarization. These results prove that considering the impact of ocean surface mixed layer turbulence on SAR remote sensing of internal solitary waves is reasonable and appropriate for settlement of the well-known problem of contemporary radar imaging models. |
| 中文摘要: |
| A new model developed from the full-spectrum model of Lyzenga and Bennett (1988) is built up by us preliminarily through considering the impact of the ocean surface mixed layer turbulence on SAR remote sensing of internal solitary waves. In the partial differential equation of the action spectral density of the surface gravity-capillary waves the source function representing the contribution of the turbulence is added besides the usual source function representing the contribution of the wind. The source function is determined by applying the k-ε model and adopting the Nasmyth spectrum of oceanic turbulence (Nasmyth, 1970; Oakey, 1982; Fan, 2002) on the basis of the previous simulation results of internal tide transformation obtained in the companion paper (Fan et al.,2008). Either under relatively high wind speed, or under low wind speed, our model predicts significant large modulations of radar backscatter at all three bands (L, C and X bands) for both VV and HH polarization. These results prove that considering the impact of ocean surface mixed layer turbulence on SAR remote sensing of internal solitary waves is reasonable and appropriate for settlement of the well-known problem of contemporary radar imaging models. |
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