...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Comparison of high-resolution wind fields extracted from TerraSAR-X SAR imagery with predictions from the WRF mesoscale model
【24h】

Comparison of high-resolution wind fields extracted from TerraSAR-X SAR imagery with predictions from the WRF mesoscale model

机译：从TerraSAR-X SAR图像提取的高分辨率风场与WRF中尺度模型的预测的比较

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We discuss the status of our efforts to determine a suitable Geophysical Model Function (GMF) that relates X-band normalized radar cross section (NRCS) to the near surface wind vector over the ocean. Development of an X-band GMF has become particularly relevant due to the recent launches of several X-band satellite synthetic aperture radar (SAR) systems. We concentrate here on SAR data collected by the TerraSAR-X satellite launched by the German Space Agency in 2007. Inversion of TerraSAR-X NRCS imagery to wind speed is accomplished using both a simple physics-based GMF as well as an empirical GMF derived by interpolating more accurately tested C- and Ku-band GMFs to X-band. We compare the retrieved wind speeds from three TerraSAR-X scenes with in situ data when available and also with predictions from the Weather Research and Forecast (WRF) model. At vertical polarization, these comparisons show reasonable agreement with in situ data for both the physics-based and empirical GMFs. At horizontal polarization however, the NRCS from the physics-based GMF is generally too low, resulting in an under prediction results of the corresponding retrieved wind speeds. An unexpected result from the WRF comparisons is the similarity between the small-scale structure (on scales ≈5-10 km) observed in the SAR imagery and the corresponding WRF output. We believe that this similarity may allow TerraSAR-X imagery to provide a quantitative measure of the quality of the WRF boundary-layer parameterization schemes.
机译：我们讨论了确定合适的地球物理模型函数（GMF）的工作现状，该模型将X波段归一化雷达横截面（NRCS）与海洋上的近地表风矢量相关联。由于最近推出了几种X波段卫星合成孔径雷达（SAR）系统，因此X波段GMF的开发变得尤为重要。我们在此集中讨论由德国航天局于2007年发射的TerraSAR-X卫星收集的SAR数据。TerraSAR-XNRCS图像反演风速是通过使用简单的基于物理的GMF以及通过以下方法得出的经验GMF来完成的将经过测试的C频段和Ku频段GMF插值到X频段。我们将从三个TerraSAR-X场景中检索到的风速与可用时的原位数据进行比较，并与Weather Research and Forecast（WRF）模型的预测进行比较。在垂直极化条件下，这些比较表明基于物理和经验的GMF都与原位数据合理吻合。但是，在水平极化时，基于物理的GMF的NRCS通常太低，导致相应的检索风速的预测结果不足。 WRF比较出乎意料的结果是，在SAR图像中观察到的小规模结构（在大约5-10 km的尺度上）与相应的WRF输出之间存在相似性。我们认为，这种相似性可以使TerraSAR-X图像提供WRF边界层参数化方案质量的定量度量。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号