Preprints
https://doi.org/10.5194/acp-2020-952
https://doi.org/10.5194/acp-2020-952

  13 Nov 2020

13 Nov 2020

Review status: this preprint is currently under review for the journal ACP.

3D simulations of tropospheric ozone depletion events using WRF-Chem

Maximilian Herrmann1, Holger Sihler2,3, Thomas Wagner2,3, Ulrich Platt3,4, and Eva Gutheil1,4 Maximilian Herrmann et al.
  • 1Interdisciplinary Center for Scientific Computing, Heidelberg University, Heidelberg, Germany
  • 2Max-Planck Institute for Chemistry, Mainz, Germany
  • 3Institute of Environmental Physics, Heidelberg University, Heidelberg, Germany
  • 4Heidelberg Center for the Environment, Heidelberg University, Heidelberg, Germany

Abstract. Tropospheric bromine release and ozone depletion events (ODEs) as they commonly occur in the Arctic spring are studied using the regional software WRF-Chem. For this purpose, the MOZART-MOSAIC chemical reaction mechanism is extended by bromine and chlorine reactions as well as an emission mechanism for reactive bromine via heterogeneous reactions on ice and snow surfaces. The simulation domain covers an area of 5,040 km x 4,960 km, centered north of Utqiagvik (formerly Barrow), Alaska, and the time interval from February through May, 2009. Several simulations for different strengths of the bromine emission are conducted and evaluated by comparison with in-situ and ozone-sonde measurements of ozone mixing ratios as well as by comparison with tropospheric BrO vertical column densities (VCDs) from the Global Ozone Monitoring Experiment–2 (GOME-2) satellite instrument. The base bromine emission scheme includes the direct emission of bromine due to bromide oxidation by ozone through the reactive surface ratio β of the ice/snow surface relative to a flat surface. 10 Results of simulations with β = 1.0 agree well with the observations, however, a value of 1.5 performs somewhat better. The bromine emission due to bromide oxidation by ozone is found to be important to provide an initial seed for the bromine explosion. Consideration of halogen chemistry substantially improves the prediction of the ozone mixing ratio with respect to the observations. Meteorological nudging is found to be essential for a good prediction of ODEs over the three months period.

Maximilian Herrmann et al.

 
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Maximilian Herrmann et al.

Maximilian Herrmann et al.

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Short summary
Three-dimensional numerical simulations of tropospheric bromine release and ozone depletion events in the Arctic polar spring of 2009 are analyzed and compared to observations. Simulation results agree well with the observations at both Utqiaġvik, Alaska and at Summit, Greenland. In a parameter study, different settings for the bromine release mechanism are evaluated. An enhancement of the bromine release mechanism is found to be beneficial for the correct prediction of the observations.
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