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© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 29 Aug 2018

Research article | 29 Aug 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Comparison of Surface Ozone Simulation among Selected Regional Models in MICS-Asia III – Effect of Chemistry and Vertical Transport for the Causes of Difference –

Hajime Akimoto1, Tatsuya Nagashima1, Jie Li2, Joshua Fu3, Dongsheng Ji3, and Zifa Wang2 Hajime Akimoto et al.
  • 1National Institute for Environmental Studies, Onogawa, Tsukuba 305-8506, Japan
  • 2Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 3Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 3799 6, USA

Abstract. In order to clarify the cause of variability among the model outputs for surface ozone in the Model Intercomparison Study Asia Phase III (MICS-Asia III), three regional models, CMAQ v.5.0.2, CMAQ v.4.7.1 and NAQPMS (abbreviated as NAQM in this paper) have been selected. The detailed analyses have been made for monthly averaged diurnal variation for select grids covering metropolitan area of Beijing and Tokyo, and at a remote oceanic site, Oki. The chemical reaction mechanism, SAPRC99 used in the CMAQ models tends to give higher net chemical ozone production than CBM-Z used in NAQM agreeing with previous studies. Inclusion of heterogeneous “renoxification” reaction of HNO3 (on soot) → NO + NO2 only in NAQM is supposed to give higher NO concentration to give better agreement with observational data for NO and nighttime O3 mixing ratios. In addition to chemistry, the difference in vertical transport of O3 was found to affect the simulated results significantly. Particularly, the increase in downward flux of O3 from upper layer to the surface after the dawn is found to be substantially different among the models. Larger early morning vertical transport of O3 by CMAQ 5.0.2 would be the reason for higher daytime O3 by this model in July. All the three models overestimate the daytime ozone by ca. 20 ppbv at the remote site Oki in July, where in situ photochemical activity is minimal.

Hajime Akimoto et al.
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Status: final response (author comments only)
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Hajime Akimoto et al.
Hajime Akimoto et al.
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Short summary
The regional model intercomparison study called MICS-Asia III revealed that substantial discrepancy still exists for surface ozone simulation in East Asia, even though the common emissions, meteorological field, and boundary conditions have been used among the models. Three factors have been identified as possible cause of such discrepancy, (1) chemistry sub-model, (2) heterogeneous reaction, and (3) vertical transport parameters, and each component has been discussed.
The regional model intercomparison study called MICS-Asia III revealed that substantial...