常见气体吸收带（笔记）

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1、文章描述 

In the solar spectrum the atmospheric gaseous absorption is principally due to:

        • oxygen (O2);

        • ozone (O3);

        • water vapor (H2O);

        • carbon dioxide (CO2);

        • methane (CH4);

        • nitrous oxide (N2O)

        O2, CO2, CH4, and N2O are assumed constant and uniformly mixed in the atmosphere, H2O and O3 concentrations depend on the time and the location. The latter two are the most important gases in our study.

        The H2O contribution affects mainly wavelengths greater than 0.7µm. 

         O3 presents a significant absorption between 0.55 and 0.65 µm and limits the earth observations at wavelengths less than 0.35 µm.

        The CO2 contribution occurs beyond 1µm, but more weakly than H2O and only perturbing the water vapor windows.

         The O2 influence is limited to a very strong band about 0.7 µm .

        The CH4 presents two absorption bands at 2.3 and 3.35 µm .

        The N2O contribution appears in two bands at 2.9 and 3.9 µm .

        In summary, we have, in the solar spectrum, good atmospheric windows for terrestrial observations by satellites:

        in the visible: between 0.40 and 0.75 µm;

        in the near and middle infrared: at about 0.85, 1.06, 1.22, 1.60, 2.20 µm.

摘抄自：《Second Simulation of a Satellite Signal in the Solar Spectrum – Vector (6SV) 2006 P11》

 2、气体吸收曲线

3、整理

H2O：以1.4、1.9、2.7、6.3um为中心的强吸收；900及1100nm附近的弱吸收

O3：550nm – 650nm强吸收、紫外

CO2 ：> 1um,弱吸收

O2：720 – 730nm附近、760nm为中心

CH4：以2.3um、3.35um为中心

N2O：以2.9um、3.9um为中心

4、参考文献

《Second Simulation of a Satellite Signal in the Solar Spectrum – Vector (6SV) 》

《SMAC: a simplified method for the atmospheric correction of satellite measurements in the solar spectrum》