The growth of the concentration of CO<sub>2</sub> results in the global warming. The atmospheric temperature can impact the intensity and the shape of line of the molecular absorption spectrum of CO<sub>2</sub>, so that the atmospheric vertical temperature profile changes affect the measured absorption spectrum of CO<sub>2</sub> by the satellite. This study focuses on the influence of the vertical temperature profile changes at different latitudes and the discontinuity of the profile in the upper layers of the atmosphere on the accuracy of retrieving CO<sub>2</sub> concentration. The simulation results suggested that the error of retrieving CO<sub>2</sub> concentration caused by the vertical temperature profile changes in the upper layers was much less than 1%.
As an important part of the earth, atmosphere plays a vital role in filtering the solar radiation, adjusting the temperature and organizing the water circulation and keeping human survival. The passive atmospheric wind measurement is based on the imaging interferometer technology and Doppler effect of electromagnetic wave. By using the wind imaging interferometer to get four interferograms of airglow emission lines, the atmospheric wind velocity, temperature, pressure and emission rate can be derived. Exploring the multi-functional and integrated innovation of detecting wind temperature, wind velocity and trace gas has become a research focus in the field. In the present paper, the impact factors of the fixed optical path difference(OPD) of near infrared wind imaging interferometer(NIWII) are analyzed and the optimum value of the fixed optical path difference is simulated, yielding the optimal results of the fixed optical path difference is 20 cm in near infrared wave band (the O<sub>2</sub>(a<sup>1</sup>Δg) airglow emission at 1.27 microns). This study aims at providing theoretical basis and technical support for the detection of stratosphere near infrared wind field and giving guidance for the design and development of near infrared wind imaging interferometer.