Preprints
https://doi.org/10.5194/acp-2022-334
https://doi.org/10.5194/acp-2022-334
 
16 May 2022
16 May 2022
Status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Ozone depletion events in the Arctic spring of 2019: A new modeling approach to bromine emissions

Maximilian Herrmann1, Moritz Schöne2,3, Christian Borger2, Simon Warnach2,3, Thomas Wagner2,3, Ulrich Platt3,4, and Eva Gutheil1,4 Maximilian Herrmann et al.
  • 1Interdisciplinary Center for Scientific Computing, Heidelberg University, Heidelberg University, Im Neuenheimer Feld 205, Heidelberg 69120, Germany
  • 2Max-Planck Institute for Chemistry, Mainz, Hahn-Meitner-Weg 1, Mainz 55128, Germany
  • 3Institute of Environmental Physics, Heidelberg University, Im Neuenheimer Feld 229, Heidelberg 69120, Germany
  • 4Heidelberg Center for the Environment, Heidelberg University, Im Neuenheimer Feld 130.1, Heidelberg 69120, Germany

Abstract. Ozone depletion events (ODEs) are a common occurence in the boundary layer during Arctic spring. Ozone is depleted by bromine species, which are most likely emitted from snow, sea ice or aerosols in an auto-catalytic reaction cycle. Previous three-dimensional modeling studies of ODEs assumed an infinite bromine source at the ground. In the present study, an alternative emission scheme is presented in which a finite amount of bromide in the snow is tracked over time. For this purpose, a modified version of the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) is used to study ODEs in the Arctic from February to May 2019. The model data are compared to in-situ measurements, ozone sonde flights as well as satellite data. A simulation of the ODEs in the Arctic spring of 2009 using the infinite bromide assumption on first year (FY) ice is transferred to the spring of 2019 which achieves good agreement with the observations, however, there is some disagreement in April 2009 and 2019 with respect to an overestimation concerning both the magnitude and the number of ODEs. New simulations using the finite bromide assumption greatly improve agreement with in-situ observations at Utqiag ̇vik, Alaska, Zeppelin Mountain, Svalbard, and Pallas, Finland in April 2019, suggesting that bromide on the sea ice is depleted to an extent that reduces the bromine release. The new simulations also slightly improve the agreement with observations at these sites in February and March. A comparison to measurements near Eureka, Canada and Nord Station, Greenland shows that multi-year ice and possibly snow-covered land may be significant bromine sources. However, assuming higher releasable bromide near Eureka does not remove all disagreement with the observations. The numerical results are also compared to tropospheric BrO vertical column densities generated with a new retrieval method from TROPOMI observations. BrO VCDs above 5 × 1013 molec/cm2 observed by the satellite agree well with the model results. However, the model also predicts BrO VCDs of around 3 × 1013 molec/cm2 throughout the Arctic and patches of BrO VCDs of around 1014 molec/cm2 not observed by the satellite, especially near Hudson Bay. This suggests that snow at Hudson Bay may be a weaker bromine source in late spring compared to snow in the north.

Maximilian Herrmann et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-334', Anonymous Referee #1, 21 Jun 2022
  • RC2: 'Comment on acp-2022-334', Anonymous Referee #2, 28 Jul 2022
  • AC1: 'Comment on acp-2022-334', Eva Gutheil, 08 Sep 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-334', Anonymous Referee #1, 21 Jun 2022
  • RC2: 'Comment on acp-2022-334', Anonymous Referee #2, 28 Jul 2022
  • AC1: 'Comment on acp-2022-334', Eva Gutheil, 08 Sep 2022

Maximilian Herrmann et al.

Maximilian Herrmann et al.

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Short summary
Ozone depletion events (ODEs) are a common occurence in the boundary layer during Arctic spring. Ozone is depleted by bromine species in an auto-catalytic reaction cycle. Previous modeling studies assumed an infinite bromine source at the ground. An alternative emission scheme is presented in which a finite amount of bromide in the snow is tracked over time. The Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) is used to study ODEs in the Arctic from February to May 2019.
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