Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-244
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
16 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
Isoprene derived secondary organic aerosol in a global aerosol chemistry climate model
Scarlet Stadtler1, Thomas Kühn2,3, Sabine Schröder1, Domenico Taraborrelli1, Martin G. Schultz1,a, and Harri Kokkola2 1Institut für Energie- und Klimaforschung, IEK-8, Forschungszentrum Jülich, Germany
2Finnish Meteorological Institute, P.O. Box 1627, 70211, Kuopio, Finland
3Department of Applied Physics, University of Eastern Finland, P.O. Box 1627, 70211, Kuopio, Finland
anow at: Jülich Supercomputing Centre, JSC, Forschungszentrum Jülich, Germany
Abstract. Within the framework of the global chemistry climate model ECHAM-HAMMOZ a novel explicit coupling between the sectional aerosol model HAM-SALSA and the chemistry model MOZ was established to form isoprene derived secondary organic aerosol (iSOA). Isoprene oxidation in the chemistry model MOZ is described by a semi-explicit scheme consisting of 147 reactions, embedded in a detailed atmospheric chemical mechanism with a total of 779 reactions. Low volatile compounds (LVOC) produced during isoprene photooxidation are identified and explicitly partitioned by HAM-SALSA. A group contribution method was used to estimate their evaporation enthalpies and corresponding saturation vapor pressures, which are used by HAM-SALSA to calculate the saturation concentration of each LVOC. With this method, every single precursor is tracked in terms of condensation and evaporation in each aerosol size bin. This approach lead to the identification of ISOP(OOH)2 as a main contributor to iSOA formation. Further, reactive uptake of isoprene epoxidiols (IEPOX) and isoprene derived glyoxal were included as iSOA sources. The parameterization of IEPOX reactive uptake includes a dependency on aerosol pH value. This model framework connecting semi-explicit isoprene oxidation with explicit treatment of aerosol tracers leads to a global, annual isoprene SOA yield of 16 % relative to the primary oxidation of isoprene by OH, NO3, and ozone. With 445 Tg (392 TgC) isoprene emitted, an iSOA source of 148 Tg (61 TgC) is simulated. The major part of iSOA in ECHAM-HAMMOZ is produced by IEPOX (24.4 TgC) and ISOP(OOH)2 (28.3 TgC). The main sink process is particle wet deposition which removes 143 Tg (59 TgC). The iSOA burden reaches 1.6 Tg (0.7 TgC) in the year 2012.

Citation: Stadtler, S., Kühn, T., Schröder, S., Taraborrelli, D., Schultz, M. G., and Kokkola, H.: Isoprene derived secondary organic aerosol in a global aerosol chemistry climate model, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-244, in review, 2017.
Scarlet Stadtler et al.
Scarlet Stadtler et al.
Scarlet Stadtler et al.

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Short summary
Atmospheric aerosols interact with our climate system and have adverse health effects. Nevertheless, these particles are a source of uncertainty in climate projections and especially the formation process for secondary aerosols formed by organic gas phase precursors is not fully understood. In order to gain a deeper understanding of secondary organic aerosol formation this model system explicitly represents gas phase and aerosol formation processes. Finally, this allows process discussion.
Atmospheric aerosols interact with our climate system and have adverse health effects....
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