Vol. 35, issue 11, article # 5

Abstract:

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

Keywords:

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

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