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学科主题: Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing
题名: Relationships Between Ku-Band Radar Backscatter and Integrated Wind and Wave Parameters at Low Incidence Angles
作者: Chu, XQ ; He, YJ ; Karaev, VY
通讯作者: yjhe@nuist.edu.cn
关键词: Integral wave parameter ; low-incidence-angle remote sensing ; radar cross section ; radar signal analysis
刊名: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
发表日期: 2012
卷: 50, 期:11, 页:4599-4609
部门归属: [Chu, Xiaoqing] Chinese Acad Sci, State Key Lab Trop Oceanog, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [He, Yijun] Nanjing Univ Informat Sci & Technol, Sch Marine Sci, Nanjing 210044, Jiangsu, Peoples R China; [Karaev, V. Yu] Russian Acad Sci, Lab Radiophys Methods Res Ocean, Inst Appl Phys, Nizhnii Novgorod 603950, Russia
项目归属: LTO
摘要: By using ten years of collocated Precipitation Radar and buoy data, the relationships between Ku-band normalized radar cross section (sigma(o)) and integrated wind and wave parameters (e. g., significant wave height, wave period, wave steepness, and wave age) at low incidence angles are analyzed for different sea states using correlation and dependence analysis. The results show that the relationships are significantly different for different sea states. Second, the potential for inverting these parameters directly from a single sigma(o) is investigated. The results reveal that the retrieval of wind speed above 10 m (U-10) is most suitable for a nonpure-swell sea and that the performance of significant wave height (H-s) retrieval decreases with the ratio of swell to wind waves. For wave period and wavelength, a feasible inversion can only be performed for a wind-wave-dominated sea. Wave steepness (delta(a)) is strongly correlated with sigma(o) in all sea states and can even be higher than that for U-10 in pure-swell seas. It is suggested from the present data set that real wave age (beta) may be retrieved from a swell-dominated sea and, therefore, has a low-value cutoff. Furthermore, the extent to which U-10 retrieval depends on sea state is examined by calculating the correlation coefficient between sigma(o) residuals and various standard wave parameters and, then, by determining the partial correlation coefficient between sigma(o) and each wave parameter controlled by U-10. Both results indicate that wind direction is better taken into account above 13.5 degrees. Moreover, an auxiliary parameter related to wave slope, such as wave steepness, would help to improve retrieval performance. Significant wave height data are of secondary use, but an implementation with real wave age information might not significantly improve wind speed retrieval. To improve the performance of H-s and wave period retrieval, auxiliary information, such as wind speed, wave steepness, or wave age, is needed. Finally, multivariable empirical models are proposed.
语种: 英语
WOS记录号: WOS:000310888600005
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10081
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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Recommended Citation:
Chu, XQ; He, YJ; Karaev, VY.Relationships Between Ku-Band Radar Backscatter and Integrated Wind and Wave Parameters at Low Incidence Angles,IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,2012,50(11):4599-4609
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文件名: Relationships Between Ku-Band Radar Backscatter and Integrated Wind and Wave Parameters at Low Incidence Angles.pdf
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