HNO 3 and HCl have been measured by many methods and techniques. The mean bias between satellite and FTIR data of stratospheric HNO 3 and HCl columns are (−8.58 ± 12.22)% and (4.58 ± 13.09)%, respectively. MLS satellite data showed similar seasonal variations and annual rates with FTIR data, and the stratospheric HNO 3 and HCl columns of the two datasets have correlation coefficients (r) of 0.87 and 0.88, respectively. Further, HNO 3 and HCl data were used to compare with Microwave Limb Sounder (MLS) satellite data. The seasonal amplitudes of stratospheric HNO 3 and HCl are 2.67 × 10 15 molec cm −2 and 4.76 × 10 14 molec cm −2 respectively, both reaching their maximum in March and their minimum in September, due to the tropopause height variation. The time series of stratospheric HNO 3 and HCl columns from January 2017 to December 2019 showed similar annual variation trends, with an annually decreasing rate of (−9.45 ± 1.20)% yr −1 and (−7.04 ± 0.81)% yr −1 for stratospheric HNO 3 and HCl, respectively. Vertical profiles and stratospheric HNO 3 and HCl columns are retrieved by ground-based high resolution Fourier transform infrared spectroscopy (FTIR) remote sensing measurements at the Hefei site in China.
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