PROJECT TITLE :

Modeling and Measurement of C-Band Radar Backscatter From Snow-Covered First-Year Sea Ice

ABSTRACT:

During this paper, we gift model and measurement results for C-band HH and VV normalized radar cross-sections (NRCS) from winter snow-lined first-year ocean ice with average snow thicknesses of sixteen, 4, and 3 cm. The brine content in snow pack was low in all 3 case studies, which is typical for cold winter conditions. We have a tendency to used the primary-order approximation of the small perturbation theory accounting for surface scattering from the air–snow and snow–ice rough interfaces and continuously layered snow and ocean ice. The experimental knowledge were collected during the Circumpolar Flaw Lead system study in the winter of 2008 within the southern Beaufort Ocean from the research icebreaker Amundsen. Good agreement between the model and experimental data were observed for all three case studies. The model results revealed that the scattering at the snow–ice rough interface is typically stronger than that at the air–snow interface. Furthermore, each model and experimental NRCS values (at VV and HH polarizations) were significantly higher for skinny-snow cover compared with the thick-snow-cowl case. We tend to associate this result with the lower attenuation of the propagated wave inside the thin-snow pack as compared to the thick-snow pack. We also demonstrated that totally different brine volume contents in snow with close thicknesses of four and 3 cm didn't have an effect on the backscattering coefficients at certain incidence angles and polarization. Our findings provide the physical basis for winter snow thickness retrieval and recommend that such retrievals might be possible from radar observations below particular scattering conditions.


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