通过使用神经网络模型来改善SST对HY-2A散射计测量的影响
Jing Wang1, Xuetong Xie2, Ruru Deng1,3,4,5
1School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China.
Sensors (Basel, Switzerland)
|July 11, 2023
概括
海面温度 (SST) 的变化会影响散射计风的准确性. 一种新的温度神经网络 (TNNW) 方法纠正了SST对Ku-band散射仪数据的影响,改善了没有复杂模型的风速测量.
科学领域:
- 海洋学 海洋学 海洋学
- 遥感 遥感 遥感 遥感
- 大气科学 大气科学
背景情况:
- 海面温度 (SST) 的变化会影响散射仪的反散射系数.
- 这直接影响了海面风力测量的准确性.
- 像HY-2A SCAT这样的Ku波段散射仪对SST变化特别敏感.
研究的目的:
- 开发和验证一种用于纠正HY-2A SCAT风力测量的SST诱导错误的新方法.
- 为了提高散射仪风速数据的运行准确性.
- 为了减少对复杂的地质物理模型函数 (GMFs) 在风力采集方面的依赖.
主要方法:
- 使用HY-2A SCAT和WindSat数据训练了一个温度神经网络 (TNNW) 模型.
- TNNW模型为SST效应纠正了回散系数.
- 与WindSat和欧洲中期天气预报中心 (ECMWF) 的再分析数据进行了验证.
主要成果:
- HY-2A SCAT风速表现出与SST相关的系统偏差 (低SST下降,高SST上升).
- 与TNNW纠正的反向散射系数产生了与WindSat相比较的风速,系统偏差减少.
- 经TNNW校正的风速与ECMWF再分析数据显示出更好的一致性.
结论:
- TNNW方法有效地纠正SST对HY-2A散射计测量的影响.
- 这种方法提高了Ku波段散射仪风速检索的准确性.
- 该方法适用于操作散射计应用,提高风数据可靠性.
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