二氧化碳(CO2)高精度反演中易受多种因素的影响，其中一部分是系统误差，如温度廓线、压力廓线、水汽以及大气分层等精度不足所带来的影响，仅利用CO2吸收带的光谱信息很难克服由此带来的误差。这种系统误差的波长依赖性小，可以考虑其他波段进行校正。模拟研究表明，上述系统误差对CO2反演的影响经O2校正后有较大程度地减小。利用大兴安岭地区的温室气体观测卫星(GOSAT)观测数据进行CO2反演，采用氧气(O2 )A吸收带校正上述系统误差，结果显示反演精度得到明显提高。

Systematic error is a part of error sources in atmospheric CO2 high precision retrieval, such as the effect of precision deficiency of temperature profile, pressure profile, H2O and atmospheric layers. This error is hard to overcome only using CO2 band, however, it is nearly independent of wavelength of radiation and can be corrected by other bands. Simulations indicate that O2 band can correct CO2 retrieval error largely. GOSAT data observing the Great Xing’an Mountains were used to retrieve atmospheric CO2 and the error of CO2 retrieval indeed decreased by O2 correction obviously.