Print Email Facebook Twitter An advanced method of contributing emissions to short-lived chemical species (OH and HO2) Title 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) Author Rieger, V.S. (TU Delft Aircraft Noise and Climate Effects; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)) Mertens, Mariano (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)) Grewe, V. (TU Delft Aircraft Noise and Climate Effects; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)) Date 2018-06-05 Abstract To mitigate the human impact on climate change, it is essential to determine the contribution of emissions to the concentration of trace gases. In particular, the source attribution of short-lived species such as OH and HO2 is important as they play a crucial role for atmospheric chemistry. This study presents an advanced version of a tagging method for OH and HO2 (HOx) which attributes HOx concentrations 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, the main chemical reactions for the HOx chemistry in the stratosphere are also regarded (in total 27 reactions). To fully take into account the main HO2 source by the reaction of H and O2, the tagging of the H radical is introduced. In order to ensure the steady-state assumption, we introduce rest terms which balance the deviation of HOx production and loss. This closes the budget between the sum of all contributions and the total concentration. The contributions to OH and HO2 obtained by the advanced tagging method V1.1 deviate from V1.0 in certain source categories. For OH, major changes are found in the categories biomass burning, biogenic emissions and methane decomposition. For HO2, the contributions differ strongly in the categories biogenic emissions and methane decomposition. As HOx reacts with ozone (O3), carbon monoxide (CO), reactive nitrogen compounds (NOy), non-methane hydrocarbons (NMHCs) and peroxyacyl nitrates (PAN), the contributions to these species are also modified by the advanced HOx tagging method V1.1. The contributions to NOy, NMHC and PAN show only little change, whereas O3 from biogenic emissions and methane decomposition increases in the tropical troposphere. Variations for CO from biogenic emissions and biomass burning are only found in the Southern Hemisphere. To reference this document use: http://resolver.tudelft.nl/uuid:b9a8dcb0-5245-4b37-9ee8-fdd11c51c686 DOI https://doi.org/10.5194/gmd-11-2049-2018 ISSN 1991-959X Source Geoscientific Model Development, 11 (6), 2049-2066 Part of collection Institutional Repository Document type journal article Rights © 2018 V.S. Rieger, Mariano Mertens, V. Grewe Files PDF gmd_11_2049_2018.pdf 1.8 MB Close viewer /islandora/object/uuid:b9a8dcb0-5245-4b37-9ee8-fdd11c51c686/datastream/OBJ/view