Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-227
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Development and technical paper
25 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
An advanced method of contributing emissions to short-lived chemical species (OH and HO2): The TAGGING 1.1 submodel based on the Modular Earth Submodel System (MESSy 2.53)
Vanessa S. Rieger1,a, Mariano Mertens1, and Volker Grewe1,a 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. To mitigate human impact on climate change, it is essential to determine the contribution of emissions to the concentration of certain trace gases. This study presents an advanced version of the tagging method for OH and HO2 (HOx) which attributes HOx concentration to emissions. While the former version V1.0 only considered 12 reactions in the troposphere, the new version V1.1, presented here, takes 19 reactions in the troposphere into account. For the first time, also the main chemical reactions for the HOx chemistry in the stratosphere are regarded (in total 27 reactions). To fully take into account the main HO2 source by the reaction of H and O2, the tagging of H radical is introduced. In order to close the budget between the sum of all contributions and the total concentration, we explicitly introduce rest terms, which balance the deviation of HOx production and loss. The contributions to the OH and HO2 concentration obtained by the improved tagging method V1.1 deviates from V1.0 in certain source categories. For OH, major changes are found in the categories of biomass burning emissions, biogenic emissions and methane decomposition. For HO2, the contributions differs strongly in the categories biogenic emission and methane decomposition. The tagged long-lived species of reactive nitrogen compounds NOy, non-methane hydrocarbons NMHC and peroxyacyl nitrates PAN show only little changes. O3 from biogenic emissions and methane decomposition decreases in the tropical troposphere. Variations for CO from lightning, biogenic and methane decomposition are found in the Southern Hemisphere.

Citation: Rieger, V. S., Mertens, M., and Grewe, V.: An advanced method of contributing emissions to short-lived chemical species (OH and HO2): The TAGGING 1.1 submodel based on the Modular Earth Submodel System (MESSy 2.53), Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-227, in review, 2017.
Vanessa S. Rieger et al.
Vanessa S. Rieger et al.
Vanessa S. Rieger et al.

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Short summary
To reduce the climate impact of human activities, it is crucial to attribute changes of atmospheric gases to anthropogenic emissions. We present an advanced method to determine the contribution of emissions to OH and HO2 concentrations. Compared to the former version, it contains the main reactions of the OH and HO2 chemistry in the troposphere and stratosphere, introduces the tagging of the H radical and closes the budget of the sum over all contributions and the total concentration.
To reduce the climate impact of human activities, it is crucial to attribute changes of...
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