A study of the relationship between photochemical ozone and its precursor emissions of nitrogen oxides and hydrocarbons in Tokyo and surrounding areas

Shinji Wakamatsu, Itsushi Uno, Toshimasa Ohara, Kenneth L. Schere

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The relationship between emission intensity of (nitrogen oxides) (NO(x)), NC non-methane hydrocarbons (NMHC) and O3 concentration covering the Kanto area (Tokyo and surrounding prefectures) were investigated based on data analysis and model simulation. The observed trend in NO(x) concentration increased and the NMHC/NO(x) ratio and NMHC concentration decreased from 1978 to 1990. These emission changes will act to change the place where the maximum ozone is observed in the Kanto area. The fact is that the location of the daily maximum oxidant concentration has moved further from the emission areas. To clarify the temporal and areal distribution of photochemical air pollution in the Kanto area, the Urban Airshed Model (UAM) was applied. Assuming 25% decrease in NMHC and 50% increase in NO(x) emission intensities, simulation result showed almost the same maximum O3 value compared with the base-case simulation for 1981. On the other hand, the time when the maximum value appeared changed from 1400JST to 1600JST. Higher concentrations of oxidants were usually observed near the shore in the morning, and moved inland following sea breeze penetration. Under these meteorological conditions, the time shift obtained by the UAM simulation corresponds to the observed areal shift of the daily maximum O3 concentration.

Original languageEnglish
Pages (from-to)3097-3108
Number of pages12
JournalAtmospheric Environment
Volume33
Issue number19
DOIs
Publication statusPublished - Aug 1 1999
Externally publishedYes

Fingerprint

nonmethane hydrocarbon
Nitrogen oxides
nitrogen oxides
Ozone
Hydrocarbons
ozone
hydrocarbon
Oxidants
oxidant
simulation
sea breeze
inland sea
Air pollution
Data structures
atmospheric pollution
penetration

All Science Journal Classification (ASJC) codes

  • Atmospheric Science
  • Environmental Science(all)
  • Pollution

Cite this

A study of the relationship between photochemical ozone and its precursor emissions of nitrogen oxides and hydrocarbons in Tokyo and surrounding areas. / Wakamatsu, Shinji; Uno, Itsushi; Ohara, Toshimasa; Schere, Kenneth L.

In: Atmospheric Environment, Vol. 33, No. 19, 01.08.1999, p. 3097-3108.

Research output: Contribution to journalArticle

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