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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Oceanic Rain Flagging Using Radar Backscatter and Noise Measurements From Oceansat-2 Scatterometer
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Oceanic Rain Flagging Using Radar Backscatter and Noise Measurements From Oceansat-2 Scatterometer

机译：使用雷达反向散射和Oceansat-2散射仪的噪声测量来进行海洋降雨标记

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This paper deals with the method developed for rain flagging over oceans using radar backscatter and noise-equivalent brightness temperature (TB) measured by a Ku-band pencil-beam scatterometer launched onboard the Oceansat-2 (OS2) satellite. The OS2 scatterometer (OSCAT) measures radar backscatter and TB by its two pencil-beam antennas at local incidence angles of ∼49° (inner) and ∼57° (outer) in horizontal and vertical polarizations, respectively. These measurements are affected by rain and heavy clouds, in addition to the ocean surface winds, thus affecting retrieval of wind vectors. The characteristics of TB at OSCAT specifications have been studied based on radiative transfer simulations. The horizontally polarized TB is observed to be sensitive to both wind speed and rain, whereas the vertically polarized TB (TBV), typically at 57°, is found to be insensitive to ocean surface wind speed but is sensitive to rain, indicating its typical utility for rain flagging. As the retrievals of wind vectors are affected by rain, then so are the associated cost functions and their characteristics under rain-free and rainy situations. A combined use of TBV and retrieval cost functions has been made for rain flagging needed in wind directional-ambiguity removal, as well as tagging the retrieval quality. A data-driven dynamical method has been developed to specifically utilize TBV for supporting rain detection in view of the slow temporal drift found in the OSCAT TB data. Rain flags have been generated from OSCAT 25-km grid L2A (Version 1.4) data for the period from November 2009 to August 2010, and the results of comparison with Tropical Rainfall Measuring Mission Precipitation Radar 2A25 data are presented.
机译：本文讨论了使用雷达反向散射和通过Oceansat-2（OS2）卫星发射的Ku波段铅笔射束散射仪测量的噪声等效亮度温度（TB）开发的用于在海洋上标记雨水的方法。 OS2散射仪（OSCAT）通过其两个笔形波束天线在水平和垂直极化方向上的局部入射角分别为〜49°（内部）和〜57°（外部）时测量雷达的反向散射和TB。除了海洋表面的风以外，这些测量还受到降雨和厚云的影响，从而影响了风向的获取。基于辐射转移模拟，已经研究了OSCAT规格的结核病特征。观察到水平极化的TB对风速和雨水都敏感，而垂直极化的TB（TBV）通常在57°时，对海洋表面风速不敏感，但对雨水敏感，表明其典型用途下雨。由于风矢量的检索受雨的影响，因此相关的成本函数及其在无雨和多雨情况下的特性也受到影响。 TBV和取回成本函数的组合使用已被用于风向歧义消除和标记取回质量中所需的降雨标记。鉴于OSCAT TB数据中存在缓慢的时间漂移​​，已经开发了一种数据驱动的动态方法来专门利用TBV支持雨水检测。从2009年11月至2010年8月的OSCAT 25公里L2A网格L2A（1.4版）数据中生成了降雨标志，并提供了与热带降雨测量任务降水雷达2A25数据的比较结果。

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