A numerical study of an autumn high ozone episode over southwestern Taiwan.

摘要: Elevated ozone concentration is one of the current major environmental concerns in Taiwan. The spatial distribution and seasonal variations ground level over Taiwan are investigated by using air quality network stations Environmental Protection Administration (TEPA). Data shows that high episodes frequently occur southwest during autumn. In this season, shallow northeasterly winds prevail after frontal passage diverted Central Mountain Range (CMR) because its mean altitude about 2.5 km. windward side northern usually associated with cloudy days, whereas sunny days weak wind speeds on lee CMR due to topographical blocking. Numerical results indicate anthropogenic emissions from north Kaohsiung could contribute as much 41% for metropolitan area 24% inland rural Pingtung northerly flow. It concluded contribution significant cannot be ignored. masses, which flows western plain daytime, picks up precursors transported southwestern After a sea breeze develops, strong onshore flow transports amounts areas resulting autumn season.