| 摘要: |
| 相比于实孔径微波辐射计，一维综合孔径微波辐射计具有高空间分辨率和多入射角观测特点。本文提出采用观测频率为6.9，10.65，18.7，23.8和36.5 GHz，且入射角范围为0°~65°的一维综合孔径微波辐射计遥感大气海洋环境要素。基于构建的微波大气海洋辐射传输正演模型，分析了辐射计亮温对大气海洋环境要素的敏感性，为辐射计关键指标确定和大气海洋环境要素反演算法设计提供技术支撑。结果表明：一维综合孔径微波辐射计的垂直和水平极化亮温对大气海洋环境要素的敏感性表现出不同特性，且敏感性随入射角的改变而变化显著；6.9和10.65 GHz对海面温度的敏感性较大，且随着入射角的增大，垂直极化亮温的敏感性增大，水平极化亮温的敏感性减小；10.65和18.7 GHz对海面风速的敏感性相对较大，且敏感性最大的风速区间位于10~20 m/s；23.8 GHz对大气水汽含量最敏感，且水汽含量较低、入射角较大时，敏感性越大；36.5 GHz对云液态水含量最敏感，随着入射角的增大，垂直极化亮温的敏感性减小，水平极化的敏感性增大，但两者均在液态水含量较小时表现出较大的敏感性。 |
| 关键词: 一维综合孔径微波辐射计 高空间分辨率 多入射角 敏感性分析 |
| DOI：10.11759/hykx20200720007 |
| 分类号: |
| 基金项目:国家自然科学基金（41475019，41705007） |
|
| Sensitivity analysis of atmospheric and oceanic environmental parameters based on one-dimensional synthetic aperture microwave radiometer |
|
FENG Meng-yan1, AI Wei-hua1, LIU Mao-hong1, CHEN Guan-yu2, LU Wen1
|
|
1.National University of Defense Technology, College of Meteorology and Oceanography, Nanjing 210000, China;2.PLA Troop 32033, Haikou 570100, China
|
| Abstract: |
| Compared with the real-aperture microwave radiometer, the one-dimensional synthetic aperture microwave radiometer has the characteristics of high spatial resolution and multiple incidence angles. This paper proposes a one-dimensional synthetic aperture microwave radiometer operating at observation frequencies 6.9, 10.65, 18.7, 23.8, and 36.5 GHz and an incidence angle range from 0° to 65° to obtain the atmospheric and oceanic environmental parameters. The sensitivity of the polarization brightness temperature to atmospheric and oceanic environmental parameters is evaluated based on the constructed microwave radiation transmission forward model. This research technically supports in determining the key indicators of the radiometer and the retrieval algorithm design. Results show that the sensitivity of the vertical and horizontal polarization brightness temperatures to the environmental parameters shows different characteristics and varies significantly with the incidence angle (0°~65°). The polarization brightness temperature becomes more sensitive to the sea surface temperature at 6.9 and 10.65 GHz, and the sensitivity of the vertical polarization brightness temperatures increases with the incidence angle. The polarization brightness temperature of 10.65 and 18.7 GHz have a relatively large sensitivity to the sea surface wind speed, and The sensitivity is greatest when the wind speed is within 10~20 m/s. The polarization brightness temperature is the most sensitive to atmospheric water vapor content at 23.8 GHz, the sensitivity is large when the water vapor content is low and the incidence angle is large. 36.5 GHz is the most sensitive to cloud liquid water content, and the sensitivity of vertical polarization brightness temperature is opposite to that of horizontal polarization brightness temperature whose sensitivity increases with the incidence angle. In addition, both of them show greater sensitivity when the cloud liquid water content is low. |
| Key words: one-dimensional synthetic aperture microwave radiometer high spatial resolution multiple incidence angles sensitivity analysis |
