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首页> 外文会议>International Geoscience and Remote Sensing Symposium >Multi-frequency microwave backscatter indices from saline snow covers on smooth first-year sea ice
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Multi-frequency microwave backscatter indices from saline snow covers on smooth first-year sea ice

机译：光滑的第一年海冰上盐雪覆盖层的多频微波反向散射指数

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摘要

This study inter-compares observed Ku-, X- and C-band microwave backscatter from saline 14 cm, 8 cm, and 4 cm snow covers on smooth first-year sea ice. A surface-borne multi-frequency (Ku-, X- and C-bands) polarimetric microwave scatterometer system is used near-coincident with in situ snow geophysical measurements. The study investigated differences in scatterometer observations for all three frequencies, co-pol ratios, and introduced new dual-frequency ratios to discriminate dominant polarization-dependent frequencies from these snow covers. Preliminary results suggest that, thinnest 4 cm snow cover demonstrate greatest increase in microwave backscatter from all three frequencies, followed by backscatter from thicker 8 cm and 14 cm snow covers. Dual-frequency indices derived for all frequency and polarization combinations suggest greater sensitivity of Ku-band microwaves to snow grain microstructure with increasing snow thicknesses, X-band microwaves to changes in snow salinities with decreasing snow thicknesses. Our results indicate the effect of dielectric loss associated with high salinities throughout all layers of the three snow covers, as the dominant factor affecting microwave penetration and backscatter from all three frequencies.
机译：这项研究进行了比较，观察了在光滑的第一年海冰上14、8、4 cm的盐覆盖层中Ku，X和C波段微波的反向散射。近地重合使用地表多频（Ku，X和C波段）极化微波散射仪系统进行原位雪地球物理测量。这项研究调查了所有三个频率的散射计观测值的差异，共极化比，并引入了新的双频比以从这些积雪中区分出主要的偏振相关频率。初步结果表明，最薄的4厘米积雪在所有三个频率上均显示微波反向散射的最大增加，然后是较厚的8厘米和14厘米积雪的反向散射。从所有频率和极化组合得出的双频指数表明，随着雪厚度的增加，Ku带微波对雪粒微结构的敏感性更高；随着雪厚度的减小，X波段微波对盐度变化的敏感性更高。我们的结果表明，在三个积雪的所有层中，与高盐度相关的介电损耗的影响是影响微波从三个频率穿透和反向散射的主要因素。

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