The Relaxed Eddy Accumulation for Estimating Aerosols Dry Deposition above Tropical Forest

Kan Khoomsab^1, and Pojanie Khummongkol²

¹Biology Program, Faculty of Science and Technology, Phetchabun Rajabhat University, Phetchabun, Thailand

²Division of Environmental Technology, School of Energy, Environment and Materials, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand

Cite this paper:
Kan Khoomsab and Pojanie Khummongkol. The Relaxed Eddy Accumulation for Estimating Aerosols Dry Deposition above Tropical Forest. Journal of Atmospheric Pollution. 2013; 1(1):1-4. doi: 10.12691/jap-1-1-1

Abstract

The relaxed eddy accumulation (REA) method was applied to estimate dry deposition fluxes and velocities of SO₄^2- and NO₃^- above a tropical forest. The monthly measured concentration of NO₃^- was found to be greater than that of SO₄^2-. The average dry deposition flux of NO₃^- was found to be greater than that of SO₄². The average deposition velocities of sulfate were evaluated to be 0.30 cm s^-1 during the day and 0.22 cm s^-1 at night, while the highest deposition velocities of nitrate were 0.93 cm s^-1 during the day and 0.54 cm s^-1 at night. The deposition velocities of aerosols (SO₄^2- and NO₃^-), calculated by using the resistance model, were found to be 0.49 cm s^-1 during the day and 0.29 cm s^-1 at night.

Keywords:
aerosols dry deposition relaxed eddy accumulation tropical forest

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