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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Dual-polarized C- and Ku-band ocean backscatter response to hurricane-force winds
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Dual-polarized C- and Ku-band ocean backscatter response to hurricane-force winds

机译：双极化C波段和Ku波段海洋反向散射对飓风的响应

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摘要

Airborne ocean backscatter measurements at C- and Ku-band wavelengths and H and V polarizations at multiple incidence angles obtained in moderate to very high wind speed conditions (25–65 m s?1) during missions through several tropical cyclones are presented. These measurements clearly show that the normalized radar cross sections (NRCS) response stops increasing at hurricane-force winds for both frequency bands and polarizations except for high incidence angles at C-band and H polarization. The results also show the mean NRCS departing from a power law behavior for all the presented frequency bands, polarizations, and incidence angles, suggesting a reduction in the drag coefficient. The overall flattening of the azimuthal response of the NRCS is also very apparent in all cases. A new set of geophysical model functions (GMFs) at C- and Ku-band are developed from these direct ocean backscatter observations for ocean surface winds ranging from 25 to 65 m s?1. The developed GMFs provide a much more accurate characterization of the NRCS versus wind speed and direction, and their implementation in operational retrieval algorithms from satellite-based scatterometer observations would result in better wind fields. The differences between these measurements and other currently available GMFs, such as QuikSCAT, NSCAT2, CMOD4, and CMOD5, are reported. The implementation of these GMFs in retrieval algorithms will result in better wind fields from satellite-based scatterometers measurements.
机译：提出了在中风到极高风速条件下（25-65 m s？1）通过几个热带气旋执行的任务期间，在C和Ku波段波长和H和V极化在多个入射角下进行的空中海洋反向散射测量。这些测量清楚地表明，除了在C波段和H偏振时的高入射角之外，对于频段和偏振，归一化雷达横截面（NRCS）的响应在飓风风中均不再增加。结果还显示，对于所有显示的频带，极化和入射角，均值NRCS偏离幂律行为，这表明阻力系数降低。在所有情况下，NRCS方位角响应的整体变平也非常明显。利用这些直接的海洋反向散射观测资料，开发了一套新的C波段和Ku波段的地球物理模型函数（GMF），其海面风速范围为25至65 m s？1。已开发的GMF提供了NRCS与风速和风向的更准确的表征，在基于卫星的散射仪观测结果的操作检索算法中实施这些算法会产生更好的风场。报告了这些测量值与其他当前可用的GMF（例如QuikSCAT，NSCAT2，CMOD4和CMOD5）之间的差异。这些GMF在检索算法中的实施将通过基于卫星的散射仪测量获得更好的风场。

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