Fig. 1. Oxygen absorption cross-section in different conditions near 764 nm wavelength. (a) Position of oxygen absorption line and reference line for pressure inversion at 10 km; (b) oxygen absorption cross-section varies with temperature at 400 hPa; (c) oxygen absorption cross-section varies with pressure at 250 K

Fig. 2. Flow chart of pressure iterative solution

Fig. 3. Position of absorption line and reference line for temperature retrieval（10 km）

Fig. 4. Results of simulation corresponding to 764.7 nm wavelength. (a) Differential transmittance corresponding to different tangent altitudes obtained by simulation; (b) relative error of differential absorption coefficient by inversion at different tangent altitudes

Fig. 5. Relative error of inversion pressure at different conditions. (a) Without temperature error and inversion error of differential absorption coefficient; (b) with only temperature error; (c) with only inversion of differential absorption coefficient; (d) with both temperature error and inversion error of differential absorption coefficient

Fig. 6. Results of simulation corresponding to 769.79759 nm wavelength. (a) Differential transmittance corresponding to different tangent altitudes obtained by simulation; (b) relative error of differential absorption coefficient by inversion at different tangent altitudes

Fig. 7. Absolute error of inversion temperature at different conditions. (a) Without inversion error of pressure and differential absorption coefficient; (b) with only inversion error of pressure; (c) with only inversion error of differential absorption coefficient; (d) with both inversion error of pressure and differential absorption coefficient

Fig. 8. Temperature and pressure inversion results without differential absorption coefficient inversion error. (a) Temperature inversion results; (b) pressure inversion results of cycle 1