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首页> 外文期刊>Geophysical Research Letters >Different ERS altimeter measurements between ascending and descending tracks caused by wind induced features over ice sheets
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Different ERS altimeter measurements between ascending and descending tracks caused by wind induced features over ice sheets

机译：冰盖上的风致特征引起的上升和下降轨道之间的不同ERS高度计测量

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摘要

The ERS1 satellite provides a high-resolution radar altimeter measurement up to 81.5° latitude for polar cap studies. Here we examine one particular effect of the interaction between the radar wave and the snowpack surface on height measurements. Measurements from ascending and descending tracks show systematic differences as large as 1 m. Such an artifact to be removed if it can be estimated. The difference appears to be related to the way the altimeter perceives wind-induced sculpting of the snowpack. Differences in the volume echo weight between ascending and descending passes appear to be the explanation. Seasat scatterometer allowed us to estimate independently the signal that could be inferred by wind features. Our results yield a map of the effect of wind on radar altimetric measurement. Finally, we consider the possibility of long-term variations in altimeter measurements caused by climatic changes.
机译：ERS1卫星可为极地盖研究提供高达81.5°纬度的高分辨率雷达高度计测量。在这里，我们研究了雷达波与积雪表面之间的相互作用对高度测量的一种特殊影响。上升和下降轨道的测量结果显示系统差异高达1 m。如果可以估计出这种伪影，则将其删除。这种差异似乎与高度计感知风积雪造型的方式有关。上升和下降通道之间的体积回波权重差异似乎可以解释。 Seasat散射仪使我们能够独立估计可能由风特征推断出的信号。我们的结果绘制出了风对雷达高度测量的影响图。最后，我们考虑了气候变化导致高度计测量值长期变化的可能性。

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