| LIU Meijie,DAI Yongshou,ZHANG Jie,ZHANG Xi,MENG Junmin,ZHU Xiuqin,YIN Yalei. 2016. The microwave scattering characteristics of sea ice in the Bohai Sea. Acta Oceanologica Sinica, 35(5):89－98 |
| The microwave scattering characteristics of sea ice in the Bohai Sea |
| 渤海海冰微波散射特性研究 |
| Received:February 13, 2015 Revised:May 13, 2015 |
| DOI：10.1007/s13131-016-0861-6 |
| Key words:sea-ice field experiment sea-ice microwave scattering characteristics sea-ice physical parameters sea-ice electromagnetic scattering theory |
| 中文关键词: 海冰现场实验 海冰微波散射特性 海冰物理参数 海冰电磁散射理论 |
| 基金项目:The National Science Foundation for Young Scientists of China under contract No. 41306193; the National Special Research Fund for Non-Profit Marine Sector under of China under contract No. 201105016; the European Space Agency-Ministry of Science and Technology of the People's Republic of China (ESA-MOST) Dragon 3 Cooperation Programme under contract No. 10501. |
| Author Name | Affiliation | E-mail | | LIU Meijie | China University of Petroleum (Huadong), Qingdao 266580, China
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
College of Physics, Qingdao University, Qingdao 266071, China | | | DAI Yongshou | China University of Petroleum (Huadong), Qingdao 266580, China | daiys@upc.edu.cn | | ZHANG Jie | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | ZHANG Xi | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | MENG Junmin | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | ZHU Xiuqin | Qingdao Branch, China Research Institute of Radiowave Propagation, Qingdao 266107, China | | | YIN Yalei | Qingdao Branch, China Research Institute of Radiowave Propagation, Qingdao 266107, China | |
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| Abstract: |
| Microwave remote sensing has become the primary means for sea-ice research, and has been supported by a great deal of field experiments and theoretical studies regarding sea-ice microwave scattering. However, these studies have been barely carried in the Bohai Sea. The sea-ice microwave scattering mechanism was first developed for the thin sea ice with slight roughness in the Bohai Sea in the winter of 2012, and included the backscattering coefficients which were measured on the different conditions of three bands (L, C and X), two polarizations (HH and VV), and incident angles of 20° to 60°, using a ground-based scatterometer and the synchronous physical parameters of the sea-ice temperature, density, thickness, salinity, and so on. The theoretical model of the sea-ice electromagnetic scattering is obtained based on these physical parameters. The research regarding the sea-ice microwave scattering mechanism is carried out through two means, which includes the comparison between the field microwave scattering data and the simulation results of the theoretical model, as well as the feature analysis of the four components of the sea-ice electromagnetic scattering. It is revealed that the sea-ice microwave scattering data and the theoretical simulation results vary in the same trend with the incident angles. Also, there is a visible variant in the sensitivity of every component to the different bands. For example, the C and X bands are sensitive to the top surface, the X band is sensitive to the scatterers, and the L and C bands are sensitive to the bottom surface, and so on. It is suggested that the features of the sea-ice surfaces and scatterers can be retrieved by the further research in the future. This experiment can provide an experimental and theoretical foundation for research regarding the sea-ice microwave scattering characteristics in the Bohai Sea. |
| 中文摘要: |
| 微波遥感是现今海冰研究的主要手段,并有大量海冰微波散射机理的现场实验和理论研究作为支撑。然而,这些工作在渤海开展得很少。2012年冬季,我们在渤海东营港首次开展了多波段、多极化小粗糙度薄海冰的微波散射机理研究,获取了海冰后向散射系数和同步的物理参数。海冰后向散射系数是利用陆基散射计得到的,其中测量波段为L,C和X波段,入射角范围为20°-60°,极化方式为HH和VV(“H”表示水平极化,“V”表示垂直极化)。海冰物理参数包括海冰温度、密度、厚度和盐度等,可作为输入参数建立本次实验的海冰电磁散射模型。本文的海冰微波散射机理研究是从两方面展开的,(1) 现场实测海冰后向散射系数和理论模拟结果的对比与分析;(2) 各海冰微波散射分量的分析与研究,包括海冰上表面散射、体散射、下表面散射和下表面-体散射等四项分量。分析结果表明,实测海冰微波散射数据和理论模拟结果随入射角的变化趋势相同。每一散射分量对不同波段的响应度是有差别的,如C和X波段对上表面散射比较敏感,X波段对体散射响应度比较高,L和C波段对下表面散射比较敏感等。因而,在今后的工作中,海冰表面散射和体散射特性可以利用这些结论进行深入的反演研究。本次实验能够为渤海海冰微波散射特性研究提供理论基础和实验数据。 |
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