Preprints
https://doi.org/10.5194/gmd-2022-250
https://doi.org/10.5194/gmd-2022-250
Submitted as: model experiment description paper
01 Nov 2022
Submitted as: model experiment description paper | 01 Nov 2022
Status: this preprint is currently under review for the journal GMD.

An inconsistency in aviation emissions between CMIP5 and CMIP6 and the implications for short-lived species and their radiative forcing

Robin N. Thor1, Mariano Mertens1, Sigrun Matthes1, Mattia Righi1, Johannes Hendricks1, Sabine Brinkop1, Phoebe Graf1, Volker Grewe1, Patrick Jöckel1, and Steven Smith2 Robin N. Thor et al.
  • 1Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
  • 2Joint Global Change Research Institute, Pacific Northwest National Laboratory, College Park, MD, USA

Abstract. We report on an inconsistency in the latitudinal distribution of aviation emissions between the data products of phases 5 and 6 of the Coupled Model Intercomparison Project (CMIP). Emissions in the CMIP6 data occur at higher latitudes than in the CMIP5 data for all scenarios, years, and emitted species. A comparative simulation with the chemistry-climate model EMAC reveals that the difference in nitrogen oxides emission distribution leads to reduced overall ozone changes due to aviation in the CMIP6 scenarios, because in those scenarios the distribution of emissions is partly shifted towards the chemically less active higher latitudes. The radiative forcing associated with aviation ozone is 7.6 % higher for the year 2015 when using the CMIP5 latitudinal distribution of emissions compared to when using the CMIP6 distribution. We do not find a statistically significant difference in the radiative forcing associated with aviation aerosol emissions.

Robin N. Thor et al.

Status: open (until 28 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Robin N. Thor et al.

Robin N. Thor et al.

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Short summary
We report on an inconsistency in the latitudinal distribution of aviation emissions between two versions of a data product which is widely used by researchers. From the available documentation, we do not expect such an inconsistency. We run a chemistry-climate model to compute the effect of the inconsistency in emissions on atmospheric chemistry and radiation and find that the radiative forcing associated for aviation ozone is 7.6 % higher when using the less recent version of the data.