EGU2020-10337
https://doi.org/10.5194/egusphere-egu2020-10337
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Changes in the temperature sensitivity of surface ozone production: a case-study based on long-term observations in Austria

Monika Mayer1, Christoph Staehle1, Christian Schmidt2, and Harald E. Rieder1
Monika Mayer et al.
  • 1University of Natural Resources and Life Sciences Vienna (BOKU), Institute of Meteorology and Climatology, Austria (monika.mayer@boku.ac.at)
  • 2University of Graz, Wegener Center for Climate and Global Change, Austria

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 NOx and 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 observational data from Austrian monitoring networks for the time period spanning 1990 – 2018. Surface ozone, nitrogen oxides (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: Mayer, M., Staehle, C., Schmidt, C., and Rieder, H. E.: Changes in the temperature sensitivity of surface ozone production: a case-study based on long-term observations in Austria, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-10337, https://doi.org/10.5194/egusphere-egu2020-10337, 2020

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