Applied Appropriate Models to The Dry Deposition Calculation in Central Taiwan

Abstract

Dry deposition plates, PS-I, MOUDI (micro orifice uniform deposit impactor), NRI (Noll rotary impactor) and Universal sampler were used to measure dry deposition fluxes, ambient air particle concentrations during day and night periods at a traffic and a rural sampling site in central Taiwan. In this study, MOUDI, NRI and Universal sampler were used to estimate the dry deposition flux. The ratios of estimated / measured dry deposition flux of total particle mass in the traffic area are better than the rural sampling site. The results indicated that dry deposition fluxes of total particle mass in the traffic site are about 100 magnitude higher than the rural sampling site. Statistical results also proved that there are no significant difference for the coarse particle concentrations in the traffic and rural sampling sites. Universal sampler is applied in predicting dry deposition flux in the rural site. The results show that Universal sampler is not a suitable device in predicting dry deposition because it can only collect particle size less than 10 μm.