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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Estimating Snow Accumulation From InSAR Correlation Observations
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Estimating Snow Accumulation From InSAR Correlation Observations

机译：从InSAR相关观测值估算积雪

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摘要

Snow accumulation in remote regions, such as Greenland and Antarctica, is a key factor for estimating the Earth's ice mass balance. In situ data are sparse; hence, they are useful to derive snow accumulation from remote sensing observations, such as microwave thermal emission and radar brightness. These data are usually interpreted using electromagnetic models in which volume scattering is the dominant mechanism. The main limitation of this approach is that microwave brightness is not well related to backscatter if the ice sheet is layered. Because larger grain size and thicker annual layers both increase radar image brightness, with the first corresponding to lower accumulation rate and the second to higher accumulation rate, models of radar brightness alone cannot accurately reflect accumulation. Consideration of correlation measurements can also resolve this ambiguity. We introduce an interferometric ice scattering model that relates the interferometric synthetic aperture radar correlation and radar brightness to both ice grain size and hoar layer spacing in the dry-snow zone of Greenland. We use this model and the European Remote Sensing satellite radar observations to derive several parameters related to snow accumulation rates in a small area in the dry-snow zone. These parameters show agreement with four in situ core accumulation rate measurements in this area, whereas models using only radar brightness data do not match the observed variation in accumulation rates
机译：格陵兰和南极洲等偏远地区的积雪是估算地球冰量平衡的关键因素。现场数据稀疏；因此，它们可用于从遥感观测（例如微波热辐射和雷达亮度）得出积雪。通常使用电磁模型来解释这些数据，在电磁模型中，体积散射是主要机制。这种方法的主要局限性在于，如果冰盖分层，微波亮度与反向散射关系不大。因为较大的晶粒尺寸和较厚的年层都增加了雷达图像的亮度，第一个对应较低的累积速率，第二个对应较高的累积速率，仅靠雷达亮度模型无法准确反映累积。考虑相关性测量也可以解决这种歧义。我们介绍了一种干涉式冰散射模型，该模型将干涉式合成孔径雷达的相关性和雷达的亮度与格陵兰干雪区的冰粒大小和白层间距相关联。我们使用此模型和欧洲遥感卫星雷达观测数据得出与干雪地区小区域积雪速率有关的几个参数。这些参数表明与该区域的四个原位岩心堆积率测量结果一致，而仅使用雷达亮度数据的模型与观测到的堆积率变化不匹配

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