TY - JOUR
T1 - Evaluation of the characteristics of acid precipitation in Taipei, Taiwan using cluster analysis
AU - Lin, N. H.
AU - Lee, H. M.
AU - Chang, M. B.
N1 - Funding Information:
The authors would like to thank the Environmental Protection Administration of Taiwan (EPA) and the National Science Council for financially supporting this study under the contract Nos. NSC87-EPA-P-008-003 and NSC86-2111-M-008-AP3, respectively. Rainwater samples were collected and analyzed by the Graduate Institute of Environmental Engineering, National Taiwan University, under a project supported by the EPA of Taiwan. Prof. F. T. Jeng was in charge of the above project. Prof. C.-S. Chen and Mr. C.-M. Peng helped classify the weather patterns for rain events.
PY - 1999
Y1 - 1999
N2 - This work investigated the characteristics of acid precipitation collected in Taipei, Taiwan during 1991-1995 by performing cluster analysis. The extent to which meteorological conditions influence precipitation chemistry was also elucidated. Three potential sources of water-soluble ions in rainwater were identified: seasalt aerosols (Na+, Cl- and Mg2+), anthropogenic pollutants (H+ and NO3/-), and mixing sources associated with sulfate (nss-SO4/2-, NH4/+ and Ca2+). As the northeast flow prevailed during the northeast monsoon season, the concentrations of seasalt and sulfate ions in rainwater were significantly high. During that season, a typically high ratio of nss-SO4/2-/NO3/- was also observed, indicating that Taipei might receive foreign pollutants via a long-range transport. In contrast, when the Pacific high dominated the region, nitrate concentration in rainwater was significantly elevated. Also during that period, the ratio of uss-SO4/2-/NO3/- was substantially lower, indicating the prominence of acidic substances contributed by local sources.
AB - This work investigated the characteristics of acid precipitation collected in Taipei, Taiwan during 1991-1995 by performing cluster analysis. The extent to which meteorological conditions influence precipitation chemistry was also elucidated. Three potential sources of water-soluble ions in rainwater were identified: seasalt aerosols (Na+, Cl- and Mg2+), anthropogenic pollutants (H+ and NO3/-), and mixing sources associated with sulfate (nss-SO4/2-, NH4/+ and Ca2+). As the northeast flow prevailed during the northeast monsoon season, the concentrations of seasalt and sulfate ions in rainwater were significantly high. During that season, a typically high ratio of nss-SO4/2-/NO3/- was also observed, indicating that Taipei might receive foreign pollutants via a long-range transport. In contrast, when the Pacific high dominated the region, nitrate concentration in rainwater was significantly elevated. Also during that period, the ratio of uss-SO4/2-/NO3/- was substantially lower, indicating the prominence of acidic substances contributed by local sources.
KW - Cluster analysis
KW - Factor analysis
KW - Precipitation chemistry
KW - Rainwater acidity
UR - http://www.scopus.com/inward/record.url?scp=0032599779&partnerID=8YFLogxK
U2 - 10.1023/A:1005021209478
DO - 10.1023/A:1005021209478
M3 - 期刊論文
AN - SCOPUS:0032599779
SN - 0049-6979
VL - 113
SP - 241
EP - 260
JO - Water, Air, and Soil Pollution
JF - Water, Air, and Soil Pollution
IS - 1-4
ER -