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High Time-resolution Characterization of PM2.5 Sulfate Measured in a Japanese Urban Site
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 Title & Authors
High Time-resolution Characterization of PM2.5 Sulfate Measured in a Japanese Urban Site
Ma, Chang-Jin; Kang, Gong-Unn; Kim, Ki-Hyun;
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 Abstract
The high time-resolution monitoring data are essential to estimate rapid changes in chemical compositions, concentrations, formation mechanisms, and likely sources of atmospheric particulate matter (PM). In this study, sulfate, , , and the number concentration of size-resolved PMs were monitored in Fukuoka, Japan by good time-resolved methods during the springtime. The highest monthly average sulfate was found in May (), followed by April (), March (), and June (). The cases exceed the Japanese central government`s safety standard for () reached 10.11% during four months campaign. The fraction of sulfate to varied from 12.05% to 68.11% with average value of 35.49% throughout the entire period of monitoring. This high proportion of sulfate in is an obvious characteristic of the ambient in Fukuoka during the springtime. However, the average fraction of sulfate to in three rain events occurred during our intensive campaign fell right down to 15.53%. Unusually high sulfate (> ) marked on three days were probably affected by the air parcels coming from the Chinese continent, the natural sulfur in the remote marine atmosphere, and a large number of ships sailing on the nearby sea. The theoretical number concentration of in was originally calculated and then compared to sulfate. A close resemblance between the diurnal variations of the theoretically calculated number concentration of in and sulfate concentration indicates that the secondary formed was the primary form of sulfate in during our monitoring period.
 Keywords
Sulfate;Particulate matter;;Particle number concentration;Fukuoka;
 Language
English
 Cited by
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