Total columns and vertical profiles of ozone above Kyiv in 2005‒2008

1Shavrina, AV, 2Kroon, M, 1Sheminova, VA, 1Pavlenko, Ya.V, 1Veles', OA, 1Syniavskyi, II, 1Romanyuk, Ya.O
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
2Meteorological Institute of the Kingdom of the Netherlands, Netherlands
Kosm. nauka tehnol. 2010, 16 ;(4):03-12
Publication Language: Russian
The total ozone columns above Kyiv and variations of ozone concentrations in the troposphere at different altitudes above Kyiv were studied using ground-based Fourier Transform InfraRed (FTIR) spectrometric observations performed on a routine basis at the Main Astronomical Observatory of the National Academy of Sciences of Ukraine (MAO NASU). The study was carried out within the framework of the international ESA-NIVR-KNMI project no. 2907 «OMI validation by ground-based remote sensing: ozone columns and atmospheric profiles» during 2005‒2008. The infrared FTIR spectral observations of direct solar radiation in the wavelength range of 2 to 12 microns as transmitted through the Earth’s atmosphere were performed every year from April to October. The aim of the project was the validation of data on the total ozone columns and vertical ozone profiles which were obtained with the Ozone Monitoring Instrument (OMI) aboard the NASA EOS-Aura scientific satellite. The simulation of the ozone spectral band shape near 9.6 microns was performed with the MODTRAN code and the molecular band model based on the HITRAN-2004 molecular database.
               The a priori information for the spectral simulation consisted of water va­por and temperature profiles from the NASA Aqua-AIRS sat­ellite instrument, stratospheric ozone profiles from the NASA EOS-Aura-MLS satellite instrument, TEMIS-KNMI clima-tological ozone profiles and surface ozone measurements for the specific times of infrared spectral observations. New pre­cise Aura-MLS stratospheric ozone profiles with accuracies better than 2 % as compared to ozone sondes allowed us to retrieve tropospheric ozone profiles. For some observational days, tropospheric ozone profiles as observed by the NASA-Aura-TES satellite instrument were available and these were compared with our retrieved profiles for the purpose of validation. The tropospheric ozone variability was analyzed for two typical episodes: the spring episode of enhanced total ozone columns and the summer episode of enhanced surface ozone concentrations. Continuous automated observations from April to October demonstrate daily photochemical variability of the tropospheric ozone depending on the solar zenith angle and reveal mixing processes occurring during the night. The high vertical and temporal resolution of our observations enables us to reveal clearly the intricate dynamics of the ozone layer which is caused by the penetration of the stratospheric ozone rich air into lower tropospheric layers, by its sinking and dissipation into the troposphere over the course of the following few days.
               Our procedure can in principle be used for any FTIR observational stations, since it allows one to make a better characterization for the horizontal and vertical dynamics of the ozone layer all over the world from ground-based observations alone.
Keywords: Fourier Transform InfraRed (FTIR) spectrometr, ozone, troposphere
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