Submitted as: model description paper 07 May 2021

Submitted as: model description paper | 07 May 2021

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

TransClim (v1.0): A chemistry-climate response model for assessing the effect of mitigation strategies for road traffic on ozone

Vanessa Simone Rieger1 and Volker Grewe1,a Vanessa Simone Rieger and Volker Grewe
  • 1Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
  • aalso at: Delft University of Technology, Aerospace Engineering, Section Aircraft Noise and Climate Effects, Delft, Netherlands

Abstract. Road traffic emits not only carbon dioxide (CO2), but also other pollutants such as nitrogen oxides (NOx), volatile organic compounds (VOC) and carbon monoxide (CO). These chemical species influence the atmospheric chemistry and produce ozone (O3) in the troposphere. Ozone acts as a greenhouse gas and thus contributes to anthropogenic global warming. Technological trends and political decisions can help to reduce the O3 effect of road traffic emissions on climate. In order to assess the O3 response of such mitigation options on climate, we developed a chemistry-climate response model called TransClim (Modelling the effect of surface Transportation on Climate). It considers road traffic emissions of NOx, VOC and CO and determines the O3 change and its corresponding stratospheric-adjusted radiative forcing. Using a tagging method, TransClim is further able to quantify the contribution of road traffic emissions to the O3 concentration. The response model bases on lookup-tables which are generated by a set of emission variation simulations performed with the global chemistry climate model EMAC (ECHAM5 v5.3.02, MESSy v2.53.0). Evaluating TransClim against independent EMAC simulations reveals very low deviations of all considered species (0.01–7 %). Hence, TransClim is able to reproduce the results of an EMAC simulation very well. Moreover, TransClim is about 6000 times faster in computing the climate effect of an emission scenario than the complex chemistry-climate model. This makes TransClim a suitable tool to efficiently assess the climate effect of a broad range of mitigation options for road traffic or to analyse uncertainty ranges by employing Monte-Carlo simulations.

Vanessa Simone Rieger and Volker Grewe

Status: open (until 02 Jul 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on gmd-2021-127', Astrid Kerkweg, 08 Jun 2021 reply
  • RC1: 'Comment on gmd-2021-127', Anonymous Referee #1, 08 Jun 2021 reply

Vanessa Simone Rieger and Volker Grewe

Vanessa Simone Rieger and Volker Grewe


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Short summary
Road traffic emissions of nitrogen oxides, volatile organic compounds and carbon monoxide produce ozone in the troposphere and thus influence Earth's climate. To assess the ozone response to a broad range of mitigation strategies for road traffic, we developed a new chemistry-climate response model called TransClim. It bases on lookup-tables containing climate-response relations and thus is able to quickly determine the climate response of a mitigation option.