Asymmetry and Anisotropy of Microwave Backscatter at Low Incidence Angles

doi:10.1109/TGRS.2012.2189010

IOCAS-IR > 海洋环流与波动重点实验室

	Asymmetry and Anisotropy of Microwave Backscatter at Low Incidence Angles
	Chu, Xiaoqing 1; He, Yijun 2; Chen, Gengxin 1; Chu, XQ (reprint author), Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China.
	2012-10-01
发表期刊	IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
ISSN	0196-2892
卷号	50 期号:10 页码:4014-4024
文章类型	Article
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.
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
DOI	10.1109/TGRS.2012.2189010
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000309361700010
引用统计	被引频次：47[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/12133
专题	海洋环流与波动重点实验室
通讯作者	Chu, XQ (reprint author), Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China.
作者单位	1.Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China 2.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao 266071, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Chu, Xiaoqing,He, Yijun,Chen, Gengxin,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, Xiaoqing,He, Yijun,Chen, Gengxin,&Chu, XQ .(2012).Asymmetry and Anisotropy of Microwave Backscatter at Low Incidence Angles.IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,50(10),4014-4024.
MLA	Chu, Xiaoqing,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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