Journal Article

FZJ-2018-02213

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ozone impacts of gas–aerosol uptake in global chemistry transport models

Stadtler, S. (Corresponding author)FZJ* ; Simpson, D. (Corresponding author) ; Schröder, S.FZJ* ; Taraborrelli, D.FZJ* ; Bott, A. ; Schultz, M.FZJ*

2018
EGU Katlenburg-Lindau

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Please use a persistent id in citations: http://hdl.handle.net/2128/20056  doi:10.5194/acp-18-3147-2018

Abstract: The impact of six heterogeneous gas–aerosol up-take reactions on tropospheric ozone and nitrogen specieswas studied using two chemical transport models, the Mete-orological Synthesizing Centre-West of the European Moni-toring and Evaluation Programme (EMEP MSC-W) and theEuropean Centre Hamburg general circulation model com-bined with versions of the Hamburg Aerosol Model andModel for Ozone and Related chemical Tracers (ECHAM-HAMMOZ). Species undergoing heterogeneous reactions inboth models include N2O5, NO3, NO2, O3, HNO3, and HO2.Since heterogeneous reactions take place at the aerosol sur-face area, the modelled surface area density (Sa) of both mod-els was compared to a satellite product retrieving the surfacearea. This comparison shows a good agreement in global pat-tern and especially the capability of both models to capturethe extreme aerosol loadings in east Asia.The impact of the heterogeneous reactions was evaluatedby the simulation of a reference run containing all hetero-geneous reactions and several sensitivity runs. One reactionwas turned off in each sensitivity run to compare it withthe reference run. The analysis of the sensitivity runs con-firms that the globally most important heterogeneous reac-tion is the one of N2O5. Nevertheless, NO2, HNO3, andHO2heterogeneous reactions gain relevance particularly ineast Asia due to the presence of high NOxconcentrationsand highSain the same region. The heterogeneous reactionof O3itself on dust is of minor relevance compared to theother heterogeneous reactions. The impacts of the N2O5re-actions show strong seasonal variations, with the biggest im-pacts on O3in springtime when photochemical reactions areactive and N2O5levels still high. Evaluation of the modelswith northern hemispheric ozone surface observations yieldsa better agreement of the models with observations in termsof concentration levels, variability, and temporal correlationsat most sites when the heterogeneous reactions are incorpo-rated. Our results are loosely consistent with results from ear-lier studies, although the magnitude of changes induced byN2O5reaction is at the low end of estimates, which seems tofit a trend, whereby the more recent the study the lower theimpacts of these reactions

Note: enthält Publikationsgebühren

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Contributing Institute(s):

1. Troposphäre (IEK-8)
2. Jülich Supercomputing Center (JSC)
3. JARA - HPC (JARA-HPC)

Research Program(s):

1. 243 - Tropospheric trace substances and their transformation processes (POF3-243) (POF3-243)
2. Chemical processes in the troposphere and their impact on climate (jicg23_20151101) (jicg23_20151101)
3. Earth System Data Exploration (ESDE) (ESDE)

Appears in the scientific report 2018

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Database coverage:
; ; ; ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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