Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2018-59
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Methods for assessment of models
12 Mar 2018
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Geoscientific Model Development (GMD) and is expected to appear here in due course.
TOAST 1.0: Tropospheric Ozone Attribution of Sources with Tagging for CESM 1.2.2
Tim Butler1, Aurelia Lupascu1, Jane Coates1, and Shuai Zhu1,a 1Institute for Advanced Sustainability Studies, Potsdam, Germany
anow at: IBM Research - China
Abstract. A system for source attribution of tropospheric ozone produced from both NOx and VOC precursors is described, along with its implementation in the Community Earth System Model (CESM) version 1.2.2 using CAM4. The user can specify an arbitrary number of tag identities for each NOx or VOC species in the model, and the tagging system rewrites the model chemical mechanism and source code to incorporate tagged tracers and reactions representing these tagged species, as well as ozone produced in the stratosphere. If the user supplies emission files for the corresponding tagged tracers, the model will produce tagged ozone tracers which represent the contribution of each of the tag identities to the modelled total tropospheric ozone. Our tagged tracers preserve Ox. The size of the tagged chemical mechanism scales linearly with the number of specified tag identities. Separate simulations are required for NOx and VOC tagging, which avoids the sharing of tag identities between NOx and VOC species. Results are presented and evaluated for both NOx and VOC source attribution. We show that northern hemispheric surface ozone is dominated year-round by anthropogenic emissions of NOx, but that the mix of corresponding VOC precursors changes over the course of the year; anthropogenic VOC emissions contribute significantly to surface ozone in winter-spring, while biogenic VOC are more important in summer. The system described here can provide important diagnostic information about modelled ozone production, and could be used to construct source-receptor relationships for tropospheric ozone.
Citation: Butler, T., Lupascu, A., Coates, J., and Zhu, S.: TOAST 1.0: Tropospheric Ozone Attribution of Sources with Tagging for CESM 1.2.2, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2018-59, in review, 2018.
Tim Butler et al.
Tim Butler et al.
Tim Butler et al.

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Short summary
This paper describes a method for determining origin of tropospheric ozone simulated in a global chemistry-climate model. This technique provides can show which precursor compounds were responsible for simulated ozone, and where they were emitted. In this paper we describe our technique, and compare and contrast it with several other similar techniques.
This paper describes a method for determining origin of tropospheric ozone simulated in a global...
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