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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Estimating Wind Stress at the Ocean Surface From Scatterometer Observations
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Estimating Wind Stress at the Ocean Surface From Scatterometer Observations

机译：从散射仪观测值估算海洋表面的风应力

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摘要

Wind stress is the most important ocean forcing for driving tropical surface currents. Stress can be estimated from scatterometer-reported wind measurements at 10 m that have been extrapolated to the surface, assuming a neutrally stable atmosphere and no surface current. Scatterometer calibration is designed to account for the assumption of neutral stability; however, the assumption of a particular sea state and negligible current often introduces an error in wind stress estimations. Since the fundamental scatterometer measurement is of the surface radar backscatter (sigma-0) which is related to surface roughness and, thus, stress, we develop a method to estimate wind stress directly from the scatterometer measurements of sigma-0 and their associated azimuth angle and incidence angle using a neural network approach. We compare the results with in situ estimations and observe that the wind stress estimations from this approach are more accurate compared with those obtained from the conventional estimations using 10-m-height wind measurements.
机译：风应力是推动热带表面流最重要的海洋动力。假设中性稳定的气氛且没有表面电流，可以根据散射仪报告的10 m处的风测量值估算应力，这些测量值已推断到地面。散射仪校准旨在考虑中性稳定性的假设。但是，假设特定的海况和可忽略的海流通常会在风应力估计中引入误差。由于基本的散射仪测量是与表面粗糙度和应力相关的表面雷达反向散射（sigma-0），因此，我们开发了一种直接从sigma-0及其相关方位角的散射仪测量中估算风应力的方法和使用神经网络方法的入射角。我们将结果与原位估计进行比较，发现与使用10米高风速测量的传统估计获得的风应力估计相比，这种方法的风应力估计更加准确。

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