YIC-IR  > 海岸带信息集成与战略规划研究中心
Effect of sea wave age on scatterometer measurements and wind speed retrieval accuracy
Panfilova, Maria1; Karaev, Vladimir1; Jie, Guo2
Conference NameEGU General Assembly 2015
Source Publication015EGUGA..17.1111P
Conference Date2015-4-12
Conference PlaceVienna, Austria

Radiolocation data is widely used for the wind field retrieval over the sea surface. Wind speed is obtained from the radar cross-section. The backscattered signal contains information about the sea surface but not about the wind vector. This means that at the fixed wind speed the radar backscattering cross-section (RCS) depends on the sea maturity. In the present work the influence of the sea state at RCS and wind speed retrieval accuracy was investigated. The collocated array of ERS scatterometer and sea buoys data was processed. Buoy data were used to determine the wave age and all the dataset was separated into three parts: developing wind waves, fully developed waves and mixed sea. It was shown that error of wind retrieval algorithms for scatterometers (CMOD in this case) depends on the sea state. Wind speed is overestimated for swell-dominant sea and underestimated for developing waves. The direct problem of RCS dependence on the wind vector and sea state was also concidered. The large-scale waves slope variance is a very important parameter that implicitly influences the RCS in case of Bragg scattering and depends on the sea state. The buoy data were used to estimate the slope variance. The algorithm based on artificial neural networks taking into account the slope variance for RCS retrieval was proposed and performed better agreement with the measured RCS than CMOD5. It was shown that RCS increases with the slope variance growth other conditions being equal. Thus wind speed retrieval accuracy can be increased by taking into account sea waves parameters and regional peculiarities. Acknowledgments

Indexed By其他
Document Type会议论文
Affiliation1.Institute of applied physics, Nizhny Novgorod, Russian Federation
2.Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Panfilova, Maria,Karaev, Vladimir,Jie, Guo. Effect of sea wave age on scatterometer measurements and wind speed retrieval accuracy[C],2015.
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