Self-consistency of marine surface wind vectors observed by ASCAT
Self-consistency of marine surface wind vectors observed by ASCAT
复制标题
ASCAT观测的海洋表面风矢量的自洽性
DOI：
10.1109/tgrs.2011.2160648
复制
发表时间：
2012
影响因子：
8.2
通讯作者：
N.
中科院分区：
文献类型：
--
作者：
Ebuchi;N.
利用MetOp-A卫星上的高级散射仪观测到的海面风矢量是通过评估它们的自洽来评估的。关于风速和风向的全球统计数据是从一年的数据中计算出来的。风速直方图显示出明显的跨轨风矢量单元(WVC)位置的相关性，该位置对应于入射角。这一趋势反映在风速分布的高阶统计量(标准差、偏度和峰度)上。风向相对于卫星飞行方向的直方图清楚地显示了相对于天线波束方向的系统误差。风向的数密度相对于天线波束方向呈现出一种系统的模式，这种模式随风速和跨轨WVC位置的变化而变化。风速和风向的这些系统误差可能会影响风场的辐散/辐合和旋转。这项研究的结果表明，风速反演算法和C波段地球物理模型函数需要进一步完善。还证实了基于散射计得到的矢量风的统计分布的评估技术对于识别风速和风向的系统误差是有效的。
Marine surface wind vectors observed by the Advanced Scatterometer on the MetOp-A satellite are evaluated by assessing their self-consistency. Global statistics on wind speeds and directions were calculated from the data for a period of one year. The wind speed histograms exhibited a clear dependence on the cross-track wind vector cell (WVC) location, which corresponds to the incidence angle. This trend was reflected in the higher order statistics (standard deviation, skewness, and kurtosis) of the wind speed distribution. The histograms of the wind directions relative to the satellite flight direction clearly showed systematic errors relative to the antenna beam directions. The number density of the wind directions exhibited a systematic pattern relative to the antenna beam directions, and the pattern varied with wind speed and cross-track WVC location. These systematic errors in the wind speed and direction may affect the divergence/convergence and rotation of the wind field. The results of this study suggest the need for further refinements of the wind retrieval algorithms and the C-band geophysical model function. It was also confirmed that the evaluation technique based on the statistical distributions of scatterometer-derived vector winds is effective for identifying systematic errors in the wind speeds and directions.