基于中国典型地区大气模式的红外透过率变化特征

Variation of Infrared Atmospheric Transmittance Based on Atmospheric Models in Typical Regions of China

利用已经建立的通用大气辐射传输软件(CART)中嵌入的我国典型地区大气模式,分析了红外波段大气透过率随月份的变化特征,并分析了用国外模式近似可能带来的误差。结果分析表明:我国典型地区大气透过率随月份变化很大,夏季比冬季要小10%以上,相邻两个月之间的红外大气透过率之差可能达到10%左右;采用近似国外模式带来的误差可达到50%以上。这些结果进一步说明:在大气遥感、目标辐射测量、图像仿真和光电工程的设计与性能评估等方面的研究中,我国区域内的大气透过率的准确计算必须考虑我国的大气模式及月份。

The variation of infrared atmospheric transmittance based on atmospheric models in typical regions of China as a function of month is analyzed in this paper by using the combined atmospheric radiative transfer （CART） software. The relative errors of the results of averaged transmittance calculated with approximate foreign atmospheric mod- el are also investigated. The results show that the average transmittance in typical regions of our country varies greatly with months. The transmittance in summer is smaller than in winter by a factor of more than 10, the difference of infrared transmittance between two close months may be about 10% ;the relative errors of results calculated using approximate foreign atmospheric model can be larger than 50%. These results also illustrate that the atmospheric models of our country must be considered for the better estimations of the atmosphere transmittance, in the study of atmosphere remote sensing, radiation measurement of target, simulation of image, design of optic-electronic engineering etc.