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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Land Contamination Analysis of SMOS Brightness Temperature Error Near Coastal Areas
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Land Contamination Analysis of SMOS Brightness Temperature Error Near Coastal Areas

机译：沿海地区SMOS亮度温度误差的土地污染分析

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摘要

For Soil Moisture And Ocean Salinity (SMOS) data, significant errors exist near coastal areas because of the contamination by the nearby land. For analyzing the origin of the land contamination, in this letter, it is found, from the global map of SMOS data error, that although the SMOS data error due to land contamination near coasts varies in different regions, the characteristic that the error increases significantly in proximity to land is similar in global scope. The detailed analysis of SMOS brightness temperature (TB) error in the selected area reveals a decreasing trend with the increase of the distance to coast (DC). An SMOS TB measurement model according to geophysical parameters of the selected area and SMOS/microwave imaging radiometer aperture synthesis antenna array is established to analyze the origin of the TB error variation due to land contamination. The simulation results, which agree with the SMOS TB data analysis, show that within 40 km of DC, TB error is large and decreases sharply from ~60 to ~4 K with the increase of DC, since the mainlobe of the antenna array is departing from land to ocean; during 40-400 km of DC, TB error decreases smoothly from ~4 to ~0.15 K, since the lower near sidelobes are observing and leaving land; TB error slightly decreases to 0 from 400 to 800 km when the lower far sidelobes leave land. The study of the origin of land contamination on ocean TB will be helpful for improving the observation of salinity near coastal areas.
机译：对于土壤水分和海洋盐度（SMOS）数据，由于附近土地的污染，沿海地区附近存在严重误差。为了分析土地污染的根源，在这封信中，从SMOS数据误差的全局图可以发现，尽管由于沿海附近土地污染导致的SMOS数据误差在不同区域有所不同，但误差显着增加的特征在全球范围内，接近土地的情况相似。对选定区域中SMOS亮度温度（TB）误差的详细分析显示，随着到海岸（DC）距离的增加，趋势呈下降趋势。根据所选区域的地球物理参数和SMOS /微波成像辐射计孔径合成天线阵列建立了SMOS TB测量模型，以分析由于土地污染引起的TB误差变化的根源。与SMOS TB数据分析相吻合的仿真结果表明，由于天线阵列的主瓣正在偏离，因此在DC的40 km内，TB误差很大，并且随着DC的增加，TB误差从〜60 K急剧减小到〜4K。从陆地到海洋；在40-400 km的DC中，由于较低的近旁瓣正在观测并离开陆地，因此TB误差从〜4平稳降低至〜0.15K。当较低的较远旁瓣离开陆地时，TB误差从400至800 km略微降低至0。对海洋结核土地污染起源的研究将有助于改善对沿海地区盐度的观测。

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  • 来源
    《IEEE Geoscience and Remote Sensing Letters》 |2017年第5期|587-591|共5页
  • 作者

    Yan Li; Qingxia Li; Hailiang Lu;

  • 作者单位

    Science and Technology on Multispectral Information Processing Laboratory, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, China;

    Science and Technology on Multispectral Information Processing Laboratory, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, China;

    Science and Technology on Multispectral Information Processing Laboratory, School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Sea measurements; Ocean temperature; Antenna arrays; Contamination; Sea surface; Land surface;

    机译：海洋测量;海洋温度;天线阵列;污染;海洋表面;陆地表面;

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