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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-286
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
10 May 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Comparison of the optical depth of total ozone and atmospheric aerosols in Poprad-Gánovce, Slovakia
Peter Hrabčák Slovak Hydrometeorological Institute, Poprad-Gánovce, 058 01, Slovakia
Abstract. Atmospheric ozone along with aerosols significantly affect the amount of ultraviolet solar radiation that reaches on the Earth's surface. Presented study is focused on the comparison of the optical depth of total ozone and atmospheric aerosols in the area of Poprad-Gánovce situated at the altitude of 706 meters above sea level, close to the highest peak of the Carpathian Mountains. Measurements of direct sun ultraviolet radiation are carried out here continuously since 1994 using the Brewer Ozone Spectrophotometer type MK IV. These measurements are used to calculate the total amount of atmospheric ozone and consequently its optical depth. Measurements can also be used to determine the optical depth of atmospheric aerosols using the Langley plot method. In this study, those two factors causing a significant reduction in the direct sun ultraviolet radiation to the Earth's surface are compared to each other. The study is showing results of measurements over 23 years, since 1994 to 2016. Values of optical depth are determined for wavelengths 306.3 nm, 310.1 nm, 313.5 nm, 316.8 nm and 320.1 nm. A statistically significant decrease in the total optical depth of the atmosphere was observed for all investigated wavelengths. Its main cause is the decrease of optical depth of aerosols. The study also presents comparison of the terrestrial and satellite data of total ozone and AOD. A very good match of satellite and terrestrial direct sun measurements of total ozone was found. The use of zenith sky measurements in combination with the direct sun measurements leads to the systematically higher values of total ozone. Comparison of the satellite and terrestrial AOD measurements in the UV range of the solar spectrum is mainly limited by the very low number of days for which AOD can be determined for satellite measurements. It has been found that AOD satellite data is higher than terrestrial in the long-term average.

Citation: Hrabčák, P.: Comparison of the optical depth of total ozone and atmospheric aerosols in Poprad-Gánovce, Slovakia, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-286, in review, 2017.
Peter Hrabčák
Peter Hrabčák
Peter Hrabčák

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Short summary
Optical depth of the total ozone and aerosols was determined using measurements of Brewer's ozone spectrophotometer in Poprad-Gánovce, Slovakia, since 1994 to 2016. Transmittance of the atmosphere in UV area of the spectrum from 306.3 nm to 320.1 nm has increased. The main reason of decrease in the total optical depth of atmosphere is statistically significant decrease of aerosols optical depth. Terrestrial measurements were also compared with satelite measurements in this study.
Optical depth of the total ozone and aerosols was determined using measurements of Brewer's...
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