基于MODTRAN模型对高分五号卫星断层逸出气体探测能力的辐射模拟

地下流体监测数据和地表断层调查都显示构造活动强烈期和大地震前后活动断裂带会伴有大量气体逸出。 中国即将发射的高分五号(GF-5)卫星搭载的大气环境红外甚高光谱分辨率探测仪及全谱段光谱成像仪两个传感器, 主要以大气气体的探测为应用目标。 本文基于两个传感器的参数设置, 使用大气辐射传输模型, 对断层逸出气体中的水汽、 CH₄和CO₂三种气体在大气中的含量变化对卫星传感器的辐射影响进行了仿真模拟, 分析了两个传感器对水汽、 CH₄和CO₂气体异常的探测能力。 结果表明, GF-5卫星两个红外传感器特定的光谱通道对大气水汽、 CH₄和CO₂气体异常变化均有不同程度的敏感性, 可以期待发展具有较高精度的相关气体遥感反演模型, 用于地震的监测及预测。

Radiation Simulation of Detection Abilities for Fault Escaping Gas based on the High-resolution Fifth Satellite

Monitoring data of underground fluid and the surface fault survey show that the fault zone will be accompanied by a large number of gas evolutions around tectonic activity and strong earthquake period. China’s High-resolution fifth satellite (GF-5) will be launched, and it includes high spectral resolution infrared atmospheric environment and full spectrum spectral imager detectors. Main application object is atmospheric gas detection. In this paper, atmospheric radiation transfer model was used to simulate the radiation effect of content vary of water vapor, CH₄ and CO₂ based on the parameter setting of two sensors. Gas anomaly detection ability from fault was analyzed by remote sensing. The results show that the GF-5 two satellite infrared sensors using their specific spectral channels can effectively detect abnormal changes of atmospheric water vapor, CH₄ and CO₂, and the satellite has a good prospect in earthquake monitoring and prediction.