Variation of volatile species of aerosols at Cheju Island Korea

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:466163

Hayami, Hiroshi ^[1]; Carmichael, G R ^[2]

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1. Central Research Institute of Electric Power Industry, Tokyo (Japan)
2. Univ. of Iowa, Iowa City, IA (United States)

A gas-aerosol equilibrium model was used to study factors responsible for the variation of aerosol composition observed at Cheju Island Korea from March 1992 to December 1994. The aerosols were assumed to be divided into the fine and coarse aerosols, and the partitioning ratios of each component was referred to measurement at Kagoshima, Japan, which is about 400 km south-east from Cheju. The gas-aerosol equilibrium was assumed to be simultaneously achieved both between gas-phase and fine-aerosol phase between gas phase and coarse-aerosol phase. The partitioning ratio of the fine-aerosol to total non-sea-salt (nss) sulfate can dramatically change the fractions of particulate to total nitrate and chloride. Particularly, the amount of nss-sulfate in the coarse aerosols is important. As sea salt increases, the fractions of particulate to total nitrate and chloride increase competing with each other to consume the non-volatile cations in the coarse aerosols at Cheju. A small amount of additional ammonium can increase the fractions of particulate to total nitrate and chloride. Additional nss-calcium can also increase these fractions, but the neutralization by the sea salt cations is generally dominant in decision of the fractions. Temperature and relative humidity do not alter the aerosol composition. It seems that the sulfate holds most of the ammonium in the fine aerosols, and that the cations prevent the nitrate and chloride go into the gas-phase, as temperature goes up.

• OSTI ID: 466163
• Report Number(s): CONF-9606185--
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR POLLUTION
CHEMICAL COMPOSITION
MATHEMATICAL MODELS
REPUBLIC OF KOREA