TY - JOUR
T1 - Measurement of atmospheric particles and anionic species across central Taiwan
AU - Fang, Guor Cheng
AU - Chang, Kuan Foo
AU - Lu, Chungsying
AU - Bai, Hsun-Ling
PY - 2003/7/21
Y1 - 2003/7/21
N2 - The ambient air concentrations and fluxes of various anionic species were sampled by MOUDI, TSP and dry deposition plates at a traffic sampling site in Taichung, central Taiwan. In the sampling period, from September to December 2000, the ambient air particle concentrations (PM1, PM2.5, PM10 and TSP) were lower in the September than in the other three months (October to December). The reason is that the northwest wind brought more particles (diameter less than 10 μm) and the higher wind speed caused higher dry deposition fluxes and TSP concentrations in the last three months. The anion species percentages of TSP were 0.24%, 13.7%, 0.52%, 12.0%, 18.9% and 54.6% for F-, Cl-, Br-, NO2
-, NO3
- and SO4
2-, respectively. The results revealed that SO4
2-, NO3
-, Cl- and NO2
- were the dominant species at the traffic sampling site. The ion-size distributions of Cl-, NO2
- and NO3
- were unimodal, the main peak being between 3.2 and 5.6 μm. In contrast, the size distribution of SO4
2- was bimodal, with the main peaks in the particle size ranges 0.32-0.56 μm and 3.2-5.6 μm. The ambient average particle dry deposition flux was 6.28 μg/m2/s, and the dry deposition fluxes were 0.01, 94.6, 0.05, 34.7, 72.2 and 376.4 ng/m2/s for F-, Cl-, Br-, NO2
-, NO3
- and SO4
2-, respectively. The dry deposition velocities were 3.10, 0.03, 3.67, 0.05, 1.54, 2.03 and 3.67 cm/s for F-, Cl-, Br-, NO2
-, NO3
- and SO4
2-, respectively.
AB - The ambient air concentrations and fluxes of various anionic species were sampled by MOUDI, TSP and dry deposition plates at a traffic sampling site in Taichung, central Taiwan. In the sampling period, from September to December 2000, the ambient air particle concentrations (PM1, PM2.5, PM10 and TSP) were lower in the September than in the other three months (October to December). The reason is that the northwest wind brought more particles (diameter less than 10 μm) and the higher wind speed caused higher dry deposition fluxes and TSP concentrations in the last three months. The anion species percentages of TSP were 0.24%, 13.7%, 0.52%, 12.0%, 18.9% and 54.6% for F-, Cl-, Br-, NO2
-, NO3
- and SO4
2-, respectively. The results revealed that SO4
2-, NO3
-, Cl- and NO2
- were the dominant species at the traffic sampling site. The ion-size distributions of Cl-, NO2
- and NO3
- were unimodal, the main peak being between 3.2 and 5.6 μm. In contrast, the size distribution of SO4
2- was bimodal, with the main peaks in the particle size ranges 0.32-0.56 μm and 3.2-5.6 μm. The ambient average particle dry deposition flux was 6.28 μg/m2/s, and the dry deposition fluxes were 0.01, 94.6, 0.05, 34.7, 72.2 and 376.4 ng/m2/s for F-, Cl-, Br-, NO2
-, NO3
- and SO4
2-, respectively. The dry deposition velocities were 3.10, 0.03, 3.67, 0.05, 1.54, 2.03 and 3.67 cm/s for F-, Cl-, Br-, NO2
-, NO3
- and SO4
2-, respectively.
KW - Dry deposition
KW - Dry deposition velocity
KW - PM
KW - PM
KW - TSP
UR - http://www.scopus.com/inward/record.url?scp=0038008184&partnerID=8YFLogxK
U2 - 10.1504/IJEP.2003.004305
DO - 10.1504/IJEP.2003.004305
M3 - Article
AN - SCOPUS:0038008184
VL - 19
SP - 351
EP - 366
JO - International Journal of Environment and Pollution
JF - International Journal of Environment and Pollution
SN - 0957-4352
IS - 4
ER -