High-resolution Air Quality Modelling And Time
Scale Analysis Of Ozone And NOx In Osaka,
Japan
Author(s)
K. L. Shrestha, A. Kondo, A. Kaga & Y. Inoue
Abstract
The ozone pollution in the Osaka region is mainly influenced by the long-range
transport of tropospheric ozone or its precursors from outside in winter but nearly
50% of the total ozone is chemically produced by regional emissions in summertime.
The effects of the regional transport and the chemical production of ozone
by regional emissions in summertime can be analysed by spectral decomposition
of the time series and studying the inherent intra-day, diurnal and longer-term time
scales in the time series of ozone and NOx. The relative contributions of these
time scale components associated with different physical processes are also used
to evaluate the performance of air qualitymodels in simulating ozone and NOx.We
used the Japanese national emission data with resolution of 10-km and 1-km resolution
in the MM5-CMAQ modelling system for the nested simulation in Osaka
with the finest domain having 1-km grid size. Among the different time scales,
diurnal time scale has the highest correlation for ozone, and longer time scale has
the highest correlation for NO and NO2. Spatial variation in the simulation of NOx
is evident from the study of correlation of diurnal and longer-term time scales, with
higher correlations in the longer-term time scale. Overall, the time scale analysis
of ozone and NOx time series has proved useful for detailed quantitative analysis
of the air quality modelling in Osaka.
Keywords: time scale analysis, air quality evaluation, urban air quality, MM5,
CMAQ.
1 Introduction
Since the ozone concentration is affected by cyclic patterns of meteorological
forcings as well as the anthropogenic influences such as traffic emission of NOx
Keywords
time scale analysis, air quality evaluation, urban air quality, MM5,
CMAQ.
Related Book
Other papers in this volume
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