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Volume 18, issue 10
Atmos. Chem. Phys., 18, 7739–7755, 2018
https://doi.org/10.5194/acp-18-7739-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Quadrennial Ozone Symposium 2016 – Status and trends...

Atmos. Chem. Phys., 18, 7739–7755, 2018
https://doi.org/10.5194/acp-18-7739-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 01 Jun 2018

Research article | 01 Jun 2018

Comparison of the optical depth of total ozone and atmospheric aerosols in Poprad-Gánovce, Slovakia

Peter Hrabčák Peter Hrabčák
  • Slovak Hydrometeorological Institute, Poprad-Gánovce, 058 01, Slovakia

Abstract. The amount of ultraviolet solar radiation reaching the Earth's surface is significantly affected by atmospheric ozone along with aerosols. The present paper is focused on a comparison of the total ozone and atmospheric aerosol optical depth in the area of Poprad-Gánovce, which is situated at the altitude of 706 m a. s. l.  in the vicinity of the highest mountain in the Carpathian mountains. The direct solar ultraviolet radiation has been measured here continuously since August 1993 using a Brewer MKIV ozone spectrophotometer. These measurements have been used to calculate the total amount of atmospheric ozone and, subsequently, its optical depth. They have also been used to determine the atmospheric aerosol optical depth (AOD) using the Langley plot method. Results obtained by this method were verified by means of comparison with a method that is part of the Brewer operating software, as well as with measurements made by a Cimel sun photometer. Diffuse radiation, the stray-light effect and polarization corrections were applied to calculate the AOD using the Langley plot method. In this paper, two factors that substantially attenuate the flow of direct ultraviolet solar radiation to the Earth's surface are compared. The paper presents results for 23 years of measurements, namely from 1994 to 2016. Values of optical depth were determined for the wavelengths of 306.3, 310, 313.5, 316.8 and 320 nm. A statistically significant decrease in the total optical depth of the atmosphere was observed with all examined wavelengths. Its root cause is the statistically significant decline in the optical depth of aerosols.

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The paper presents results of a Brewer MKIV optical depth measurements from 1994 to 2016. The optical depth values were determined for the wavelengths of 306.3, 310, 313.5, 316.8 and 320 nm. The Langley plot method was applied to calculate the aerosols optical depth. A statistically significant decrease in the total optical depth of the atmosphere was observed with all examined wavelengths. Its root cause is the statistically significant decline in the optical depth of aerosols.
The paper presents results of a Brewer MKIV optical depth measurements from 1994 to 2016. The...
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