Aerosol Number Concentrations during Kosa Events on Suburban Hills in Japan |
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Authors: | Koichi Watanabe Issei Suzuki Yukiko Dokiya |
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Institution: | (1) Toyama Prefectural University, Kosugi-machi, Toyama, Japan;(2) Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan;(3) Edogawa University, Nagareyama, Chiba, Japan |
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Abstract: | Measurements of aerosol size-separated number concentrations were performed in March 2001 on the Tama Hills of Japan, located
near regions of heavy industry. The concentrations of particles larger than 1.0 μ m in diameter dramatically increased during
the Kosa phenomena on 6–8 and 18–24 March. The number concentrations of coarse particles (> 3.0 μm) showed distinct diurnal
variations, especially during the Kosa events. Fine particles smaller than 0.5 μm increased when the relative humidity was
high and the wind speed was low. On the other hand, the coarse particles concentrations were well correlated with wind speed
and temperature. The dry deposition velocity of the coarse particles at the forest canopy was estimated from the nighttime
decrease in the number concentrations. |
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Keywords: | aerosol number concentration Kosa dry deposition forest canopy |
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