A numerical study of summer ozone concentration over the Kanto area of Japan using the MM5/CMAQ model

Mai Khiem*, Ryozo Ooka, Hong Huang, Hiroshi Hayami

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We assessed the ability of the MM5/CMAQ model to predict ozone (O3) air quality over the Kanto area and to investigate the factors that affect simulation of O3. We find that the coupled MM5/CMAQ model is a useful tool for the analysis of urban environmental problems. The simulation results were compared with observational data and were found to accurately replicate most of the important observed characteristics. The initial and boundary conditions were found to have a significant effect on simulated O3 concentrations. The results show that on hot and dry days with high O3 concentration, the CMAQ model provides a poor simulation of O3 maxima when using initial and boundary conditions derived from the CMAQ default data. The simulation of peak O3 concentrations is improved with the JCAP initial and boundary conditions. On mild days, the default CMAQ initial and boundary conditions provide a more realistic simulation. Meteorological conditions also have a strong impact on the simulated distribution and accumulation of O3 concentrations in this area. Low O3 concentrations are simulated during mild weather conditions, and high concentrations are predicted during hot and dry weather. By investigating the effects of different meteorological conditions on each model process, we find that advection and diffusion differ the most between the two meteorological regimes. Thus, differences in the winds that govern the transport of O3 and its precursors are likely the most important meteorological drivers of ozone concentration over the central Kanto area.

Original languageEnglish
Pages (from-to)236-246
Number of pages11
JournalJournal of Environmental Sciences
Issue number2
Publication statusPublished - 2011 Feb
Externally publishedYes


  • Air quality modeling
  • Initial/boundary conditions
  • Meteorological conditions
  • Ozone

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Environmental Science(all)


Dive into the research topics of 'A numerical study of summer ozone concentration over the Kanto area of Japan using the MM5/CMAQ model'. Together they form a unique fingerprint.

Cite this