HY-2散射计微波后向散射的温度影响机理、模型、及风场反演研究

项目名称： HY-2散射计微波后向散射的温度影响机理、模型、及风场反演研究

项目编号： No.41476152

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 解学通

作者单位： 广州大学

项目金额： 84万元

中文摘要： 海风风场是作用在海洋表层的主要动力因子，获取高精度、高时空分辨率的海面风场数据具有十分重要的科研价值和现实意义。星载散射计为获取海面风场数据提供了全新的技术手段。但现有用于风场反演的地球物理模型函数都只是考虑了后向散射系数与雷达波长、入射角、极化方式、风速和相对风向等几个关键因子之间的函数关系，而忽略温度等其它海洋环境因子的影响。然而理论和实验均表明，后向散射系数除了与几个主要影响因子有关外，还受到温度等海面环境因子的影响。 本项目针对现有模型存在的问题,利用我国海洋二号卫星微波散射计测量的后向散射系数、海上浮标测得的海面风速、风向、海面温度、以及大气温度等数据，分析海面温度对后向散射系数的影响，研究其影响机理，并在此基础上构建包含温度因子的地球物理模型函数(GMF)及相应的风场反演算法,为进一步提高海面风场反演精度和稳定性奠定理论和技术基础。

中文关键词： HY-2卫星；微波散射计；海面风场；遥感反演

英文摘要： Sea surface wind is the main source of momentum to the upper ocean system. Therefore, it is of great value to obtain ocean surface wind data with high precision and high spatial and temporal resolutions both for research and applications. Satellite scatterometer provides a new method to operationally obtain the ocean surface wind. However, none of the existing geophysical model functions(GMF) used in wind vector retrieval takes the effect of the sea surface temperature into account. In the traditional GMF, the backscatter coefficient is only considered as a function of radar wavelength, incidence angle, polarization, wind speed and relative azimuth. Theory and experiments demonstrate that the sea surface temperature actually have an impact on the behavior of the microwave backscatter of the ocean surface. According to the main problem of the existing GMFs, this project will attempt to analyze the characteristic of the effect of sea surface temperature on the ocean surface backscatter, explore its mechanism and establish the new GMF with the sea surface temperature as an independent variable by using the backscatter coefficients data from HY-2 scatterometer, and wind speed, wind direction, sea surface temperature, air temperature data from ocean buoys. The corresponding wind vector retrieval algorithm with sea surface temperature as one of the input parameters will be also derived in this project. The work in this project will lay a theoretical and technological foundation for further improving the precision and stability of the wind vector retrieval using microwave scatterometer data.

英文关键词： HY-2 Satellite;Microwave Scatterometer;Sea Surface Wind Field;Remote Sensing Inversion