Journal article

Near-ground ozone source attributions and outflow in central eastern China during MTX2006

Li J, Wang Z, Akimoto H, Yamaji K, Takigawa M, Pochanart P, Liu Y, Tanimoto H, Kanaya Y ...see all

Atmospheric Chemistry and Physics, vol. 8, issue 24 (2008) pp. 7335-7351

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A 3-D regional chemical transport model, the Nested Air Quality
Prediction Model System (NAQPMS), with an on-line tracer tagging module
was used to study the source of the near-ground (level) ozone at Mt. Tai (36.25 degrees N, 117.10 degrees E, 1534 m
a.s.l.) in Central Eastern China (CEC) during the Mount Tai eXperiment
2006 (MTX2006). The model reproduced the temporal and spatial variations
of near-ground ozone and other pollutants, and it captured highly
polluted and clean cases well. The simulated near-ground ozone level
over CEC was 60-85 ppbv ( parts per billion by volume), which was higher
than values in Japan and over the North Pacific (20-50 ppbv). The
simulated tagged tracer data indicated that the regional-scale transport
of chemically produced ozone over other areas in CEC contributed to the
greatest fraction (49%) of the near-ground mean ozone at Mt. Tai in
June; in situ photochemistry contributed only 12%. Due to high
anthropogenic and biomass burning emissions that occurred in the
southern part of the CEC, the contribution to ground ozone levels from
this area played the most important role (32.4 ppbv, 37.9% of total
ozone) in the monthly mean ozone concentration at Mt. Tai; values
reached 59 ppbv (62%) on 6-7 June 2006. The monthly mean horizontal
distribution of chemically produced ozone from various ozone production
regions indicated that photochemical reactions controlled the spatial
distribution of O-3 over CEC. The regional-scale transport of pollutants
also played an important role in the spatial and temporal distribution
of ozone over CEC. Chemically produced ozone from the southern part of
the study region can be transported northeastwardly to the northern rim
of CEC; the mean contribution was 5-10 ppbv, and it reached 25 ppbv
during high ozone events. Studies of the outflow of CEC ozone and its
precursors, as well as their influences and contributions to the ozone
level over adjacent regions/countries, revealed that the contribution of
CEC ozone to mean ozone mixing ratios over the Korean Peninsula and
Japan was 5-15 ppbv, of which about half was due to the direct transport
of ozone from CEC and half was produced locally by ozone precursors
transported from CEC.

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  • J. Li

  • Z. Wang

  • H. Akimoto

  • K. Yamaji

  • M. Takigawa

  • P. Pochanart

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