Asymmetry and Anisotropy of Microwave Backscatter at Low Incidence Angles
Chu, XQ; He, YJ; Chen, GX; yjhe@nuist.edu.cn
2012
发表期刊IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
ISSN0196-2892
卷号50期号:10页码:4014-4024
摘要This paper presents the first results from a study of upwind/downwind asymmetry (UDA) and upwind/crosswind anisotropy (UCA) of the Ku-band radar backscatter at low incidence angles (0 degrees to 18 degrees) from satellite observations. Incidence angle, wind speed, and sea state dependence were a particular focus. Data were obtained from the Ku-band HH-polarized precipitation radar data in the Tropical Rainfall Mapping Mission colocated with measurements from buoys. It is shown that there is a statistically significant directional signal in the UDA and UCA data when the radar incidence angle is greater than 5 degrees. In particular, a higher radar backscatter was observed from the downwind as opposed to the upwind look direction. This is contrary to scatterometer measurements at moderate incidence angles. As a whole, the main trends for these negative asymmetries increase the absolute magnitudes with increasing wind speed. This UDA is explained by the use of non-Gaussian statistics of the sea surface slope. By contrast, there is a change in behavior of the UCA of microwave backscatter at a critical wind speed of about 6 to 8 m/s. The magnitude of UCA apparently decreases with increasing wind speed below this wind speed range, and then it increases for higher wind speeds. Sensitivities to both incidence angle and sea state are also analyzed.
部门归属[Chu, Xiaoqing; Chen, Gengxin] Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [He, Yijun] Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao 266071, Peoples R China
关键词Radar Cross Section Radar Signal Analysis Sea Surface Electromagnetic Scattering Surface Waves
学科领域Geochemistry & Geophysics ; Engineering, Electrical & Electronic ; Remote Sensing
语种英语
资助项目LTO
WOS记录号WOS:000309361700010
引用统计
被引频次:17[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10099
专题热带海洋环境国家重点实验室(LTO)
通讯作者yjhe@nuist.edu.cn
推荐引用方式
GB/T 7714
Chu, XQ,He, YJ,Chen, GX,et al. Asymmetry and Anisotropy of Microwave Backscatter at Low Incidence Angles[J]. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,2012,50(10):4014-4024.
APA Chu, XQ,He, YJ,Chen, GX,&yjhe@nuist.edu.cn.(2012).Asymmetry and Anisotropy of Microwave Backscatter at Low Incidence Angles.IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,50(10),4014-4024.
MLA Chu, XQ,et al."Asymmetry and Anisotropy of Microwave Backscatter at Low Incidence Angles".IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 50.10(2012):4014-4024.
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