Abstract
Based on the results of oceanic microwave remote sensing and the dynamics of ocean waves as well as in situ measurements, the effects of nonlinear features of slope spectra of the sea surface at the low sea state on microwave emissivity are studied. It is revealed that the Bragg scattering effect of capillary-gravity waves of the sea surface on microwave influences not only the scattering measurements dara, but also the microwave emission. The effects reflect that there is a trough on the curve of changes in microwave emissivity of vertical polarization with frictional velocity, u*, on the sea surface. The measurement results also indicate changes in microwave emissivity with the wind direction. This fact also proves that the directionality of capillary-gravity waves influences not only the scattering measurements, but also emission. Based on these results, the possibility of measuring the spectra of capillary-gravity waves using a multifrequeney microwave radiometer is presented. It is pointed out that when the physical parameters besides the wind field are measured with microwave radiometry, it is neocessary to correct the effects of sea surface roughness or choose the measurement circumstances to keep away from the influence of the sea state.
Published Version
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