Keywords :
Aerosols,
Elemental carbon,
Dry deposition,
Wet deposition,
Southeast Asia
บทคัดย่อ :
and plant impacts, dry and wet deposition of EC was investigated in a tropical deciduous forest, Sakaerat,
Thailand. Micro-meteorological measurements and monthly sampling of PM2.5 aerosols were carried out
continuously over one year in 2010 at the top of an experimental tower 38 m above the ground
established in the forest. The dry deposition was estimated by the inferential method by using an
empirical parameterization of aerosol deposition velocity. For measurement of wet deposition, biweekly
sampling of EC directly filtrated from rainwater was carried out continuously over one year in 2010. EC
concentration significantly increased during the period from January to March due to heavy biomass
burning, and decreased during the period from June to September due to less biomass burning and the
washout effect by rainfall. High deposition velocities were caused by high wind speed in February to
April and also by both large displacement height and medium wind speed in May to July. Dry deposition
increased during the period from February to April when the concentration and deposition velocity were
both high, and decreased during the period from June to December when the concentration or depo-
sition velocity was low. Wet deposition peaked in March because of the washout effect of high EC in the
atmosphere of the late dry season. Wet deposition was somewhat high from August to October with
increased rainfall. Both dry and wet deposition increased in the leafless season and decreased in the leafy
season, respectively. The annual dry and wet depositions were estimated as 0.58 and 0.05 mg m2 day1
,
respectively. Taking the uncertainties of estimations into account, dry deposition was still significantly
higher than wet deposition.
เอกสารอ้างอิง :
Matsuda, K., Sase, H., Murao, N., Fukazawa, T., Khoomsub, K., Chanonmuang, P., ... & Khummongkol, P. (2012). Dry and wet deposition of elemental carbon on a tropical forest in Thailand. Atmospheric Environment, 54, 282-287.
