Abstract
Atmospheric nitric acid (HNO3) has a significant impact on the formation of the ozone layer; therefore, its content is regularly monitored using various local and remote-sensing methods. We use ground-based measurements of solar IR spectra with a Bruker 125HR Fourier spectrometer to derive information on the HNO3 content at the NDACC St. Petersburg observational site in Peterhof. The HNO3 time series shows a pronounced seasonal cycle with a maximum in winter and early spring and a minimum in summer and early autumn. The averaged seasonal variations in nitric acid vary from –30 to +60% for the 0–15 km layer, from –25 to +25% for the 15–50 km layer, and from –25 to +30% for total columns. For the 2009–2022 measurement period, no statistically significant trend is found in the time series considered. A comparison of HNO3 stratospheric columns with independent satellite measurements by the MLS and ACE–FTS instruments shows their qualitative and quantitative agreement; the correlation coefficient between ground-based and satellite measurements totals 0.88–0.93. Time series on the vertical structure of the atmospheric nitric acid measured at the St. Petersburg site can be used both to analyze the state of the ozonosphere and to validate satellite measurements and refine the parameters of atmospheric models.
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ACKNOWLEDGMENTS
Ground-based spectroscopic measurements were performed using the scientific equipment of the Geomodel resource center at Saint Petersburg State University.
Funding
FTIR measurements of nitric acid in various layers of the atmosphere were obtained with support from the Russian Foundation for Basic Research, grant no. 20-05-00627. Comparisons of ground-based and satellite measurements were made as part of the work of the Studies of the Ozone Layer and Upper Atmosphere laboratory at Saint Petersburg State University, agreement with the Ministry of Education and Science of the Russian Federation no. 075–15-2021-583.
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Virolainen, Y.A., Timofeyev, Y.M., Polyakov, A.V. et al. Ground-Based FTIR Measurements of Atmospheric Nitric Acid at the NDACC St. Petersburg Site. Izv. Atmos. Ocean. Phys. 59, 167–173 (2023). https://doi.org/10.1134/S000143382302007X
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DOI: https://doi.org/10.1134/S000143382302007X