Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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By K. St. Germain, G. A. Poe, and P. W. Gaiser

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At wo-scale scattering model of the sea developed in terms of wind-generated stochastic processes of the surface-the elevation spectral density of the small-scale structure and the probability density of slopes of the large scale roughness-is combined with the Durden/Vesecky [1] wave height spectral model to analyze recent polarimetric measurements. Ad hoc parameter values are found for the wave model that allow the two-scale model to account for essentially all of the azimuthal features, amplitude and phase, appearing in all four Stokes parameters for the Jet Propulsion Laboratory (JPL) aircraft measurements at 19.35 and 37 GHz [2] and recent Naval Research Laboratory (NRL) aircraft measurements at 10.7 GHz. The excellent agreement provides support for the validation of the approximations of the two-scale model for the range of conditions encountered. The ad hoc parameters of the wave model are developed using the 19.35 and 37.0 GHz data and then tested with 10.7 GHz data. The twoscale model should be useful in studies dealing with simulations and retrievals of surface wind direction from satellite-based polarimetric measurements.

Citation: (See works that cites this article)
K. St. Germain, G. A. Poe, and P. W. Gaiser, "Polarimetric Emission Model of the Sea at Microwave Frequencies and Comparison with Measurements," Progress In Electromagnetics Research, Vol. 37, 1-30, 2002.

1. Durden, S. L. and J. F. Vesecky, "Aph ysical radar cross-section model for a wind-driven sea with swell," J. Ocean Engr., Vol. 10, No. 4, 445-451, 1985.

2. Yueh, S. H., "Modeling of wind direction signals in polarimetric sea surface brightness temperatures," IEEE Trans. Geosci. Remote Sensing, Vol. 35, No. 6, 1400-1418, 1997.

3. Yueh, S. H., W. J. Wilson, F. K. Li, W. B. Ricketts, and S. V. Nghiem, "Polarimetric brightness temperatures of sea surfaces measured with aircraft K- and Ka-band radiometers," IEEE Trans. Geosci. Remote Sensing, Vol. 33, No. 5, 1177-1187, 1997.

4. Chang, P. S., P. W. Gaiser, L. Li, and K. M. St. Germain, "Multi-frequency polarimetric microwave ocean wind direction retrievals," Proceedings of the International Geoscience and Remote Sensing Symposium, Singapore, 1997.

5. Yueh, S. H., W. J. Wilson, S. J. DiNardo, and F. K. Li, "Polarimetric microwave brightness signatures of ocean wind direction," IEEE Trans. Geosci. Remote Sensing, Vol. 37, No. 2, 949-959, 1999.

6. Wentz, F. J., "Measurement of oceanic wind vector using satellite microwave radiometers," IEEE Trans. Geosci. Remote Sensing, Vol. 30, No. 5, 960-972, 1992.

7. Meissner, T. and F. J. Wentz, "An updated analysis of the ocean surface wind direction signal in passive microwave brightness temperatures," submitted to IEEE Trans. Geosci. Remote Sensing, 2002.

8. Chang, P. S. and L. Li, "Ocean surface wind speed and direction retrievals from the SSM/I," IEEE Trans. Geosci. Remote Sensing, Vol. 36, No. 6, 1866-1871, 1998.

9. Wick, G. A., J. J. Bates, and C. C. Gottschall, "Observational evidence of a wind direction signal in SSM/I passive microwave data," IEEE Trans. Geosci. Remote Sensing, Vol. 38, No. 2, 823-837, 2000.

10. Piepmeier, J. R. and A. J. Gasiewski, "High-resolution passive polarimetric microwave mapping of the ocean surface wind vector fields," IEEE Trans. Geosci. Remote Sensing, Vol. 39, No. 3, 606-622, 2001.

11. Hollinger, J. P., "Passive microwave measurements of sea surface roughness," IEEE Trans. Geoscience Elect., Vol. 9, No. 3, 165-169, 1971.

12. Stogryn, A. P., "The apparent temperature of the sea at microwave frequencies," IEEE Trans. Ant. Prop., Vol. 15, No. 2, 278-286, 1967.

13. Cox, C. S. and W. H. Munk, "Measurements of the roughness of the sea surface from photographs of the sun’s glitter," J. Opt. Soc. Am., Vol. 44, 838-850, 1954.

14. Hollinger, J. P., "Passive microwave measurements of the sea surface," J. Geophys. Res., Vol. 75, No. 27, 5209-5213, 1970.

15. Semyonov, B. I., "Approximate computation of scattering of electromagnetic waves by rough surface contours," Radio Eng. Electron Phys., Vol. 11, 1179-1187, 1966.

16. Wu, S. T. and A. K. Fung, "A non-coherent model for microwave emissions and backscattering from the sea surface," J. Geophys. Res., Vol. 77, No. 30, 5917-5929, 1972.

17. Wentz, F. J., "At wo-scale scattering model for foam-free sea microwave brightness temperatures," J. Geophys. Res., Vol. 80, No. 24, 3441-3446, 1975.

18. Yueh, S. H., et al., "Polarimetric passive remote sensing of ocean wind vectors," Radio Sci., Vol. 29, No. 4, 799-814, 1994.

19. Poe, G. A., K. M. St. Germain, and P. W. Gaiser, "Theory of polarimetric emission model of the sea at microwave frequencies,", Naval Research Laboratory Technical Memorandum Report, in press, 2002.

20. Stogryn, A. P., "A study of radiometric emission from a rough sea surface,", NASA Report CR-2088, Contract 1-10633, 1972.

21. Durden, S. L. and J. F. Vesecky, "An umerical study of the separation wavenumber in the two-scale scattering approximation," IEEE Trans. Geosci. Remote Sensing, Vol. 28, No. 2, 271-272, 1990.

22. Fung, A. K. and K. K. Lee, "A semi-empirical sea-spectrum model for scattering coefficient estimation," IEEE Ocean Engr., Vol. 7, No. 4, 166-176, 1982.

23. Donelan, M. A., W. J. Pierson, and Jr., "Radar scattering and equilibrium ranges and wind-generated waves with application to scatterometry," J. Geophys. Res., Vol. 92, No. C5, 4971-5029, 1987.

24. Stogryn, A. P., "Equations for the permittivity of sea water,", Report to Naval Research Laboratory, Washington, D.C., Code 7223, Aug. 1997.

25. Yueh, S. H., W. J. Wilson, F. K. Li, W. B. Ricketts, and S. V. Nghiem, "Polarimetric measurements of sea surface brightness temperatures using an aircraft K-band radiometer," IEEE Trans. Geosci. Remote Sensing, Vol. 33, No. 1, 85-92, 1995.

26. Kunkee, D. B. and A. J. Gasiewski, "Simulation of passive microwave wind direction signatures over the ocean using an asymmetrices wave geometrical optics model," Radio Science, Vol. 32, No. 1, 59-78, Jan. 1997.

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