Significant latitudinal gradient in the surface ozone spring maximum over East Asia

Details Significant latitudinal gradient in the surface ozone spring maximum over East Asia Significant latitudinal gradient in the surface ozone spring maximum over East Asia

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3221805t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 21, CiteID L21805

Physics

22

Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry, Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Atmospheric Processes: Regional Modeling, Atmospheric Processes: Climatology (1616, 1620, 3305, 4215, 8408)

Scientific paper

The climatology of surface ozone over East Asia was investigated at a wide range of latitudes by integrating continuous measurements from Japanese monitoring networks. Although a spring maximum and a summer minimum were observed at all seven remote stations, significant latitudinal differences in the seasonal cycles were found, particularly in spring. At low latitudes (20-30°N) the spring maximum appears in March, while it appears in April at high latitudes (40-50°N), and in May at middle latitudes (30-40°N). A regional-scale chemical transport model was applied to examine factors contributing to the latitudinal dependence observed. The model reproduces the latitudinal gradient and the overall seasonal variations well, and suggests that transport patterns of Asian continental outflow coupled with photochemistry result in latitudinal inhomogeneity over East Asia. These results highlight the key role of dynamical processes in modulating the amplitude and phase of the spring maximum in surface ozone.

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