Wind speed retrieval from RADARSAT-2 quad-polarization images using a new polarization ratio model
文献类型：期刊论文
| 作者 | Zhang, Biao1; Perrie, Will1; He, Yijun2 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
 |
| 出版日期 | 2011-08-04 |
| 卷号 | 116页码:C08008 |
| ISSN号 | 0148-0227 |
| DOI | 10.1029/2010JC006522 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 学科主题 | Oceanography |
| URL标识 | 查看原文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000293652500001 |
| 公开日期 | 2012-07-03 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/11626]  |
| 专题 | 海洋研究所_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. |
入库方式： OAI收割
来源：海洋研究所
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