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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Passive Polarimetric Microwave Signatures Observed Over Antarctica
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Passive Polarimetric Microwave Signatures Observed Over Antarctica

机译：在南极观测到的被动极化微波特征

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摘要

WindSat fully polarimetric passive microwave observations, expressed in the form of the Stokes vector, were analyzed over the Antarctic ice sheet. The vertically and horizontally polarized brightness temperatures (first two Stokes components) from WindSat are shown to be consistent with previous studies. Azimuthal modulations in the third and fourth Stokes components were analyzed and related to surface topography, roughness, and snow morphology. A second harmonic sine function of the azimuth angle was used to estimate the orientation angle of snow features, such as topographic slope and sastrugi. The results show good agreement with the orientations derived in a previous study using scatterometer data at similar frequencies. Seasonal variability in the third and fourth Stokes components is discussed. A consistent pattern of response emerged for 10.7 GHz. Under winter conditions, the large contribution of multiple volume scattering causes a high and regionally varying 10.7-GHz fourth Stokes signal. Under summer conditions, surface scattering dominates and results in a high 10.7-GHz third Stokes signal. The third and fourth Stokes observations at 37 GHz were found to correspond to the smaller penetration depth at this higher frequency, resulting in a low difference between the amplitudes of summer and winter. The study demonstrates the potential of the spaceborne fully polarimetric passive microwave radiometers in monitoring the thermal and morphological properties of large ice sheets.
机译：在南极冰盖上分析了以Stokes矢量形式表示的WindSat全极化被动微波观测结果。 WindSat的垂直和水平极化亮度温度（前两个斯托克斯分量）显示与以前的研究一致。分析了第三和第四斯托克斯分量中的方位角调制，并将其与表面形貌，粗糙度和雪形貌有关。方位角的二次谐波正弦函数用于估计雪特征（如地形坡度和sastrugi）的定向角。结果表明，与先前使用散射仪数据在相似频率下进行的研究得出的方向具有很好的一致性。讨论了第三和第四斯托克斯分量的季节性变化。 10.7 GHz出现了一致的响应模式。在冬季条件下，多重体积散射的巨大贡献会导致较高的且局部变化的10.7 GHz第四斯托克斯信号。在夏季条件下，表面散射占主导地位，并产生高10.7 GHz的第三斯托克斯信号。发现在37 GHz处进行的第三和第四次斯托克斯观测值对应于此较高频率下的较小穿透深度，从而导致夏季和冬季振幅之间的差异很小。这项研究证明了星载全极化无源微波辐射计在监测大冰盖的热和形态特性方面的潜力。

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