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학술저널
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한국기상학회 Asia-Pacific Journal of Atmospheric Sciences 한국기상학회지 제41권 제1호
발행연도
2005.2
수록면
139 - 148 (10page)

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The meteorological conditions are very important when we observe aerosol mass concentration. Especially, a relative humidity mostly affects the aerosol mass measurement. The aim of study is to understand the characteristics on automatic PM₁? analyzers for monitoring Asian dust and to analyze the PM₁? mass concentration with meteorological conditions such as relative humidity and wind speed. Under the meteorological condition, the new PM₁? analyzer of the GRIMM company includes the removing humidity system. In this study, we compare the Anderson PM₁? analyzer that is usually used for monitoring Asian dust in Korea with that of the GRIMM company. The both concentrations of the PM₁? analyzers are increased as the relative humidity is high. The maritime air mass causes to increase PM₁? mass concentration because the air mass has a lot of humidity. In that case, the accuracy of observing PM₁? mass concentration depends on the dehumidifying system in the each PM₁? analyzer. The Anderson PM₁? analyzer is relatively more affected by relative humidity than the GRIMM PM₁? analyzer. The Anderson PM₁? analyzer is a filter based observing instrument and the GRIMM PM₁? analyzer is an optical observing instrument. The PM₁? concentration in the ambient is affected by the effective establishment of dehumidifying system in each PM₁? analyzer. The GRIMM PM₁? analyzer has more good dehumidifying system than that of the Anderson PM₁? analyzer. To understand the relative humidity effect in the each PM₁? analyzer, Nephelometer that measure the aerosol scattering coefficients under controlling relative humidity is compared with the PM₁? analyzers. The correlation of aerosol scattering coefficient at 500 nm by Nephelometer and the PM₁? mass concentration by the PM₁? analyzers is 0.8 at the GRIMM PM₁? mass concentration and 0.7 at the Anderson PM₁? mass concentration. In the comparison of the GRIMM PM₁? analyzer with the Anderson PM₁? analyzer, the GRIMM PM₁? analyzer is less affected by relative humidity than Anderson PM₁? analyzer. Therefore, more exact observation of dust mass concentration in the ambient air depends on the improvement of dehumidifying system in the PM₁? mass concentration measurements.

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