Sulphur Dioxide Dry Deposition Flux And Velocity In Northern Thailand
Author(s)
S. Thepanondh, M. Hooper & G. Ayers
Abstract
Sulphur dioxide dry deposition flux and
velocity in Northern Thailand
S. ~he~mondh', M. ~ o o ~ e r ' & G. ~ ~ e r s ~
'~chool of Applied Sciences, Monash ~niversity, Australia
'CSIRO Atmospheric Research, Australia
Abstract
Measurement of dry deposition of atmospheric sulphur species has been
conducted recently in the Mae Moh thermal power plant area in Northern
Thailand. In this study, a circular water surface sampler (WSS) and a knifeleading
edge surrogate surface (KSS) were used to measure directly the sulphate
and sulphur dioxide (SO3 dry deposition loads and fluxes. Sampling was
carried out on a daily basis during the dry season. The dry deposition velocity of
SO2 has been calculated using on-site measured sulphate flux and ambient SO2
concentration data. The average dry deposition flux for sulphate was 57.60
mg/m2/day; for particulate sulphate, it was 12.76 mg/m2/day; and for SO2 gas, it
was 34.27 mg/m2/day. The average dry deposition velocity of SO2 calculated
from the measured flux an
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