EGU21-11467
https://doi.org/10.5194/egusphere-egu21-11467
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

30 years of surface ozone measurements in Austria: long-term trends, attainment statistics, and changes in the temperature sensitivity of surface ozone production

Christoph Stähle1, Monika Mayer1, Christian Schmidt1, Jessica Kult1, Vinzent Klaus1, Heidelinde Trimmel1, Stefan Schreier1, Jan Karlicky1,2, Michael Alexander1, and Harald Rieder1
Christoph Stähle et al.
  • 1Institute of Meteorology and Climatology, University of Natural Resources and Life Sciences (BOKU), Vienna, Austria
  • 2Department of Atmospheric Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic

As the production of ozone in surface air is determined by ambient temperature and by the prevalent chemical regime, a very different temperature dependence of ozone production emerges for nitrogen oxides (NOx) and volatile organic compounds (VOC) limited regions. In this study we evaluated the temperature sensitivity of ozone production for rural, suburban as well as urban sites in Austria on seasonal basis. The analysis is based on 30 years of observational data from Austrian monitoring networks for the time period 1990 – 2019. Reductions in precursor emissions as observed in 2020 in Austria due to the pandemic will be used to test the obtained results. Surface ozone, NOx, daily sums of global radiation and minimum daily temperature are used as covariates in our study. The observed NOx to VOC ratio at individual sites is variable over time due to changes in precursor emissions and/or the variability of meteorological parameters such as mixing layer height. At the site level we relate the temperature sensitivity of ozone production to the daily mean NOx mixing ratio and the daily minimum temperature. This information allows us to determine the impact of past/future temperature changes on surface ozone abundance in the context of reductions of NOx emissions and changing methane backgrounds.

How to cite: Stähle, C., Mayer, M., Schmidt, C., Kult, J., Klaus, V., Trimmel, H., Schreier, S., Karlicky, J., Alexander, M., and Rieder, H.: 30 years of surface ozone measurements in Austria: long-term trends, attainment statistics, and changes in the temperature sensitivity of surface ozone production, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-11467, https://doi.org/10.5194/egusphere-egu21-11467, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.