Comparison of Satellite and Ground-Based Measurements of Tropospheric Ozone Columns in the Vicinity of St. Petersburg

• Published in: Izvestiya. Atmospheric and oceanic physics 2023-08, Vol.59 (4), p.411-420
• Main Authors: Virolainen, Ya. A., Nerobelov, G. M., Polyakov, A. V.
• Format: Article
• Language: English
• Subjects: Algorithms; Climatology; Earth and Environmental Science; Earth Sciences; Emission measurements; Geophysics/Geodesy; Global ozone; Infrared spectroscopy; Ozone; Ozone distribution; Ozone measurements; Photochemicals; Photochemistry; Quality assessment; Satellite instruments; Satellites; Statistical analysis; Troposphere; Tropospheric ozone
• ISSN: 0001-4338; 1555-628X
• DOI: 10.1134/S000143382304014X

Much attention from scientists around the world is currently focused on monitoring the tropospheric ozone content, because ozone in the troposphere is both a greenhouse and a pollutant gas. It also plays an important role in various chemical and photochemical processes. Various ground-based measurements can be used to assess the quality and validate satellite measurements of the global ozone distribution. Time series of ozone content in the 0–8 km tropospheric layer based on the spectral measurements of the IASI satellite instrument using two different algorithms (IASI_LATMOS and IASI_LISA) and from joint measurements by the IASI and GOME-2 instruments (IASI-GOME2) have been compared with ground-based measurements at NDACC St. Petersburg station measured using a Bruker IFS 125HR (FTIR) Fourier spectrometer over the period 2009–2021. IASI_LISA and IASI-GOME2 data generally overestimate ground-based ozone measurements in the 0–8 km layer by 9.8 and 5.1%, respectively; there are no systematic differences between the IASI_LATMOS and FTIR data. The standard deviations of the differences between ground measurements and the IASI_LISA and IASI_LATMOS data do not exceed 12–13%; for the IASI-GOME2 data they are 24.5%. The data of ground-based and satellite measurements are best correlated in spring and summer. Ground-based and satellite measurements of IASI_LATMOS show the presence of a statistically significant negative trend in the ozone content in the 0–8 km layer in the vicinity of St. Petersburg over the period 2012–2021, which is –0.71 ± 0.35% per year and –0.60 ± 0.21% per year, respectively.