The study of dry deposition using Principal Component Analysis method in the coastal area of Northern Taiwan

• Main Authors: Chan-Chang, Li, 李展昌
• Other Authors: Hung-Yu, Chen
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/07960636891362989089

碩士 === 國立臺灣海洋大學 === 海洋環境資訊學系 === 94 === In this study, 175 of total suspended particulate samples were collected by using high volume sampler during the period of December 2003 to September 2004. All samples were analyzed for the major anion ions (chloride and sulfate) and inorganic nitrogen species (ammonium, nitrite and nitrate). The results show a clear seasonal variation for the total suspended particles (TSP). In general, the high mass concentrations of TSP (0.159 mg m-3) which were contributed by continental materials from the mainland China were found during winter and spring. Moreover, the low mass concentrations of TSP (0.125 mg m-3) which were mainly provided by marine materials from the oceanic sources during summer and autumn. For the distributions of anion ion, the mean concentrations of chloride and sulfate were 33.2 and 27.6 µg m-3, respectively. In this study, sulfate was identified into sea-salt and non-sea-salt sources by using the ratio between chloride and sulfate in seawater. The results show that sea-salt (17%) and non-sea-salt sulfate (83%) are higher in winter and spring than in summer. However, the concentrations of both items (18 µg m-3) were lower than they support to be (24 µg m-3) which may result from the scavenging process by rainfall in February and March 2004. From the result of major component analysis, the aerosols were affected by the monsoon system and driven sources. The influence factors can be classified into: the first major component is the seasonal factor; the second component is the anthropogenic source; the third component is the wind speed and the fourth is the relative humidity.