Wind speed retrieval from RADARSAT-2 quad-polarization images using a new polarization ratio model

doi:10.1029/2010JC006522

IOCAS-IR > 海洋环流与波动重点实验室

	Wind speed retrieval from RADARSAT-2 quad-polarization images using a new polarization ratio model
	Zhang, Biao 1; Perrie, Will 1; He, Yijun 2
	2011-08-04
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	0148-0227
卷号	116 页码:C08008
文章类型	Article
摘要	This paper presents a first attempt to analyze C-band RADARSAT-2 measurements of the normalized radar cross sections (NRCS) in quad-polarization acquisition mode (HH, VV, HV, and VH) over the ocean. NRCS in copolarizations and cross-polarizations are found to be different; the latter is independent of radar incidence angles and wind directions, but is quite linear with respect to wind speeds. We also investigate the properties of the polarization ratio, denoted PR, and show that it is dependent on incidence angle and azimuth angle as well as wind speed. It also correlates well with wave steepness and significant wave height. Moreover, the polarization difference shows a linear relationship with wind speed. Two new analytical models are proposed to estimate PR; one is a function of incidence angle only, while the other has additional dependence on wind speed. Comparisons are presented with theoretical and empirical PR models from the literature; the new PR model which includes wind speed dependence is shown to best compare with observed RADARSAT-2 data. An assessment of this PR model is given using different CMOD algorithms and RADARSAT-2 images. Results show that the wind speeds retrieved from this PR model and CMOD5. N are in good agreement with buoy measurements (standard deviation, 1.37 m/s). This joint GMF-PR approach constitutes a promising hybrid model for wind speed retrievals from HH-polarized RADARSAT-2 images.; This paper presents a first attempt to analyze C-band RADARSAT-2 measurements of the normalized radar cross sections (NRCS) in quad-polarization acquisition mode (HH, VV, HV, and VH) over the ocean. NRCS in copolarizations and cross-polarizations are found to be different; the latter is independent of radar incidence angles and wind directions, but is quite linear with respect to wind speeds. We also investigate the properties of the polarization ratio, denoted PR, and show that it is dependent on incidence angle and azimuth angle as well as wind speed. It also correlates well with wave steepness and significant wave height. Moreover, the polarization difference shows a linear relationship with wind speed. Two new analytical models are proposed to estimate PR; one is a function of incidence angle only, while the other has additional dependence on wind speed. Comparisons are presented with theoretical and empirical PR models from the literature; the new PR model which includes wind speed dependence is shown to best compare with observed RADARSAT-2 data. An assessment of this PR model is given using different CMOD algorithms and RADARSAT-2 images. Results show that the wind speeds retrieved from this PR model and CMOD5. N are in good agreement with buoy measurements (standard deviation, 1.37 m/s). This joint GMF-PR approach constitutes a promising hybrid model for wind speed retrievals from HH-polarized RADARSAT-2 images.
学科领域	Oceanography
DOI	10.1029/2010JC006522
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000293652500001
引用统计	被引频次：109[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/337002/11625
专题	海洋环流与波动重点实验室
作者单位	1.Fisheries & Oceans Canada, Bedford Inst Oceanog Dartmouth, Dartmouth, NS B2Y 4A2, Canada 2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Biao,Perrie, Will,He, Yijun. Wind speed retrieval from RADARSAT-2 quad-polarization images using a new polarization ratio model[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2011,116:C08008.
APA	Zhang, Biao,Perrie, Will,&He, Yijun.(2011).Wind speed retrieval from RADARSAT-2 quad-polarization images using a new polarization ratio model.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,116,C08008.
MLA	Zhang, Biao,et al."Wind speed retrieval from RADARSAT-2 quad-polarization images using a new polarization ratio model".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 116(2011):C08008.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Wind speed retrieval（5038KB）			限制开放	--	浏览