研究成果報告書 E98C0131.HTM
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C-1.3.1. Study on the Deposition Veloci ty of Gases and Fine Droplets
[Contact Person]
Tsutomu Fukuyama
Sect ion Chief
Atmospheric Measurement Section
Atmospheric Environment Division
The National Institute for Environmental Studies
16-2 Onogawa, Tsukuba 305 Japan
Tel. +81-298-50-2515 Fax +81-298-50-2579
e-mail fukuyamt@nies.go.jp
Total Budget for FY 1996-1998
29,478,000 Yen (FY 1998; 9,718,000 Yen)
Abstract
Dry deposition velocities of O3, NO2 and SO2 were measured for croplands where bean, wheat, or corn was grown. Deposition velocities of O3 and SO2 were measured also for a red-pine forest and for Chinese soils, respectively. Fine droplet deposition was studied by artificial fog experiments carried out in a vertical shaft.
Main results obtained in this study are as follows: 1) In croplands, O3 was found largely to deposit to the plant bodies, and its velocity depended on the stomata opening, whereas SO2 seemed to deposit onto soil. 2) Deposition velocity of O3 measured for a red-pine forest was found unusually large in summer, suggesting a contribution of gas phase reactions to the removal process. 3) The surface resistance of a loess sample was measured separately from the other resistance components. 4) In a field observation undertaken at an urban site of Beijing, deposition velocity of SO2 was found generally larger that reported for common soils. 5) It was confirmed that the fine droplet deposition was more like dry deposition than 'wet deposition by using model leaves made of water-absorbing polymer.
[Key Words]
Dry Deposition, Occult Deposition, Deposition Velocity, Sulfur Dioxide, Ozone, Cropland, Red-pine Forest, Loess
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