Vol. 35, issue 11, article # 5

Virolainen Ya. A., Timofeev Yu. M., Poberovsky A. V., Polyakov A. V. Information content of ground-based FTIR method for atmospheric HNO3 vertical structure retrieval. // Optika Atmosfery i Okeana. 2022. V. 35. No. 11. P. 906–911. DOI: 10.15372/AOO20221105 [in Russian].
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Nitric acid plays an important role in atmospheric chemistry; therefore, it is currently monitored by various methods and instruments. Ground-based FTIR method based on spectral measurements of solar radiation by Bruker Optics IFS 125HR spectrometers allows to retrieve not only the total column HNO3, but also its content in several atmospheric layers. We analyze time series of HNO3 measurements at St. Petersburg NDACC site between 2009 and 2021. We demonstrate that FTIR measurements can provide information on HNO3 content in at least two atmospheric layers; the degrees of freedom for signal in average totals 3.1. The mean random error of HNO3 measurements amount to 3.9, 14 and 1.6% for total atmospheric, tropospheric (up to 15 km), and stratospheric (above


atmospheric nitric acid, information content and accuracy of measurements, vertical resolution, FTIR ground-based measurements


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