典型光谱吸收模型对静止轨道毫米波辐射分析

为分析我国未来拟发展的高轨静止卫星毫米波大气辐射特征，选择最佳模拟其毫米波辐射的光谱吸收线库方案，选取了三种基于典型光谱吸收线库逐线吸收模型（毫米波传播模型(MPM)、罗氏模型(ROS)和高分辨率分子吸收传输模型(HITRAN)），针对拟新增的静止轨道毫米波探测频率424 GHz，分析了三种大气吸收模型模拟该频率大气吸收系数随大气温度、大气压强和大气湿度的变化差异。构建了一种多层毫米波辐射传输模型，利用上海探空站加密观测数据，模拟风云三号B星微波湿度探测仪(FY3B/MWHS) 183.31 GHz三个毫米波通道辐射值，并与真实观测值对比，分析三种光谱吸收线库在模拟海陆边界地区毫米波辐射时的性能差异。分析结果表明，对于424 GHz通道三种大气吸收模型对大气温度、大气压强和大气湿度的敏感变化趋势一致，数值上MPM模型与ROS模型更接近，HITRAN模型要显著低于其他模型。对于183.31 GHz，在海陆交界地区MPM模型模拟误差相比ROS和HITRAN模型最小，所有模型的第五通道模拟误差比第三通道和第四通道要小。

Impacts Analysis of Typical Spectral Absorption Models on Geostationary Millimeter Wave Atmospheric Radiation Simulation

To analyze atmospheric radiation characteristics of geostationary millimeter wave remote sensing, three different typical spectral absorption line database based line-by-line millimeter wave atmospheric absorption models, Millimeter-wave Propagation Model(MPM), ROSenkranz Model (ROS), High-resolution TRAN smission molecular absorption Model(HITRAN), were applied. Under different atmospheric temperature, pressure and water vapor conditions, the differences between the three models were analyzed on 424 GHz, which are planned to add to a geostationary satellite. A multi-layer millimeter wave radiative transfer model was presented. By utilizing intensively observing radiosonde data of Shanghai, simulated millimeter wave radiations of Fengyun 3B(FY3B) microwave humidity sounder (MWHS) were calculated under the three atmospheric absorption models. The simulations were compared with the real observations of FY3B MWHS, with temporal-spatial matching. The accuracy of the three models was analyzed. Simulations show that, for 424 GHz channels, the trends of the three models’ results are the same over atmospheric temperature, pressure and water vapor. The values of MPM and ROS are much closer to each other than HITRAN. The performance of MPM is better than ROS and HITRAN. Simulation errors in channel 5 are less than channel 3 and 4 of FY3B/MWHS.