Title: Evaluation of SO2 dry deposition over a cassava plantation in Rayong, Thailand

Authors: Panjai Saueprasearsit, Pojanie Khummongkol

Addresses: Division of Environmental Technology, School of Energy and Materials, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand. ' Division of Environmental Technology, School of Energy and Materials, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand

Abstract: SO2 emissions have become a significant problem in the East Asian region. Long term exposure to high SO2 concentration can affect human health and the environment. Approximately half of the SO2 is delivered to the earth by the dry deposition process; the other half is deposited by wet deposition. Thus, an assessment of SO2 dry deposition is necessary for understanding its qualitative and quantitative effects. In the research program described here, SO2 dry deposition was studied in terms of SO2 dry deposition flux and deposition velocity using the Bowen ratio technique. All necessary parameters were measured above a cassava plantation at a site in Rayong, Thailand during the period from June to September 2004. The Bowen ratio technique was most applicable during the 8:00 to 17:00 time period of each day. The results yield an average transfer coefficient of 10.6 cm/s, relevant to the height interval across which differences were measured. The average dry deposition flux was 0.17 mg/m²/hr and the average dry deposition velocity was 0.14 cm/s.

Keywords: sulphur dioxide; dry deposition; Bowen ratio; Thailand; air pollution; air quality.

DOI: 10.1504/IJEP.2009.021830

International Journal of Environment and Pollution, 2009 Vol.36 No.1/2/3, pp.255 - 261

Published online: 05 Dec 2008 *

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