An Ocean Wave Spectrum Derived from Polarimetric Microwave Radiometer Data

This paper presents a detailed analysis of a simplified Two-Scale Model for ocean surface polarimetric microwave emission, and investigates the extent to which varying ocean surface length scales contribute to brightness temperature zeroth and second azimuth harmonics. The Two-Scale Model can be expressed as a weighting function M0,2 multiply ocean surface curvature spectrum C0,2. This implies a simple way to investigate the effect of curvature spectrum on ocean emission. It is found that ocean waves with wavelengths both comparable to and much greater than the electromagnetic wavelength can contribute to these harmonics, depending on the value of the ocean surface spectrum in these length scales. An ocean wave spectrum was derived from polarimetric microwave radiometer data according to constrained linear least-squares method.

[1]  Jingshan Jiang,et al.  Consideration on accuracy and efficiency of two-scale polarimetric emissivity model used for oceanic passive microwave remote sensing , 2007, 2007 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications.

[2]  John F. Vesecky,et al.  Two-Scale Polarimetric Emissivity Model: Efficiency Improvements and Comparisons with Data , 2002 .

[3]  Joel T. Johnson,et al.  An efficient two-scale model for the computation of thermal emission and atmospheric reflection from the sea surface , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[4]  Simon Yueh,et al.  Modeling of wind direction signals in polarimetric sea surface brightness temperatures , 1997, IEEE Trans. Geosci. Remote. Sens..

[5]  Simon Yueh,et al.  Modelling of wind direction signals in polarimetric sea surface brightness temperatures , 1996, IGARSS '96. 1996 International Geoscience and Remote Sensing Symposium.

[6]  F. J. Wentz,et al.  A model function for ocean microwave brightness temperatures , 1983 .

[7]  S. Durden,et al.  A physical radar cross-section model for a wind-driven sea with swell , 1985, IEEE Journal of Oceanic Engineering.

[8]  K. Katsaros,et al.  A Unified Directional Spectrum for Long and Short Wind-Driven Waves , 1997 .

[9]  Min Zhang,et al.  Theoretical study of the small slope approximation for ocean polarimetric thermal emission , 1999, IEEE Trans. Geosci. Remote. Sens..

[10]  W. Linwood Jones,et al.  The WindSat spaceborne polarimetric microwave radiometer: sensor description and early orbit performance , 2004, IEEE Transactions on Geoscience and Remote Sensing.

[11]  Simon Yueh,et al.  Polarimetric microwave wind radiometer model function and retrieval testing for WindSat , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[12]  SuMing-Yang,et al.  Directional Spectrum of Wind Waves： Part II-Comparison and Confirmation , 2003 .

[13]  Liu Yuguang,et al.  Directional spectrum of wind waves: Part I—model and derivation , 2003 .