Sensitivity of regional ozone concentrations to temporal distribution of emissions

Zhining Tao, Susan M. Larson, Allen Williams, Michael Caughey, Donald J. Wuebbles

Research output: Contribution to journalArticlepeer-review


Temporal representations of emissions bear large uncertainty. Before any costly efforts are undertaken to improve the accuracy of temporal emission profiles, however, the impact of their uncertainty on predictions of surface O 3 concentrations should be examined. In this study, a 3-D air quality modeling system was used to probe the sensitivity of regional surface O 3 concentrations to temporal allocation of emissions over the continental US. The raw emissions inventory was processed using SMOKE and was segmented into hourly intervals using both "time-varying" and "uniform" temporal profiles of anthropogenic sources. Our simulation results show that, on average and with the grid resolution (90 km) used, regional daytime O 3 concentrations are not sensitive to changes in the temporal allocation of emissions, while nighttime O 3 concentrations are lower under "uniform" profiles than under "time-varying" profiles.

Original languageEnglish (US)
Pages (from-to)6279-6285
Number of pages7
JournalAtmospheric Environment
Issue number37
StatePublished - Dec 2004


  • Anthropogenic emissions inventory
  • Continental US
  • Photochemical model
  • Temporalization

ASJC Scopus subject areas

  • General Environmental Science
  • Atmospheric Science


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