提出了一种利用地面中等光谱分辨率的太阳红外光谱反演整层大气中某几种微量成分总含量的方法,用逐线积分(LBL)法计算整层大气分子吸收,采用差分吸收法测量太阳红外光谱得到实际大气中微量成分的吸收,用最大似然法反演出微量成分的总量。详细分析了这种方法的可行性和反演精度,数值模拟分析和实际测量表明该方法有较高的精度,已把该方法用于监测实际大气中甲烷和水汽总含量的变化。

A method is described for retrieval of several column amounts of atmospheric trace gas from ground-based mid-resolution infrared solar spectrum. In the method, a line-by-line (LBL) algorithm is used to calculate column atmospheric absorption, the absorption in real atmosphere is obtained by measurement of differential absorption of IR solar spectrum, the column amounts of absorber have been derived by best-likely method, the feasibility and accuracy are analyzed in the paper in detail. The results show that it has a relatively high accuracy. The method has been applied to monitor the seasonal variation of the column amounts of atmospheric methane and water vapor.