Asymmetry and Anisotropy of Microwave Backscatter at Low Incidence Angles

CORC > 海洋研究所 > 中国科学院海洋研究所 > 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
刊名	IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
	2012-10-01
卷号	50 期号:10 页码:4014-4024
关键词	Radar cross section radar signal analysis sea surface electromagnetic scattering surface waves
ISSN号	0196-2892
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.
英文摘要	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.
学科主题	Geochemistry & Geophysics ; Engineering, Electrical & Electronic ; Remote Sensing
收录类别	SCI
原文出处	10.1109/TGRS.2012.2189010
语种	英语
WOS记录号	WOS:000309361700010
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/12133]
专题	海洋研究所_海洋环流与波动重点实验室
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
推荐引用方式 GB/T 7714	Chu, Xiaoqing,He, Yijun,Chen, Gengxin. 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.(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.