The study of chemical composition in atmosphere dry depositions over Keelung and Pengjiayu Island under the haze events.

• Main Authors: He, Kai-Lin, 何凱霖
• Other Authors: Chen, Hung-Yu
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/rcj6ss

碩士 === 國立臺灣海洋大學 === 海洋環境資訊系 === 105 === In this study, we collected the Total Suspended Particulates (TSP) from January to December 2015 at costal site on the southern East China Sea at Keelung city and Pengjiayu (island), and investigated the chemical composition of atmospheric dry depositions aerosol under the haze events. TSP samples were analyzed for Nitrogen, Carbon, Phosphorus species and ions (including major ions and non-sea-salt (nss ions). The result found in Keelung and Pengjiayu TSP mass concentrations have a more significant increase during the haze events, roughly 2 to 3 times higher than non-haze days. Analysis on the chemical compositions of aerosols, the transboundary transport of air pollutants and dust from the Asian continent became more abundant in SO42-, NO3- and NH4+ under the haze events. The calculation results of molar ratio between NH4+ and nss-SO42-, in order to determine composition of secondary inorganic aerosols (SIA), during haze events at Keelung and Pengjiayu the main forms of NH4+ might be NH4HSO4 and (NH4)2SO4. For water-soluble total nitrogen species the composition of water-soluble inorganic nitrogen occupies a higher proportion under the haze events, at Keelung and Pengjiayu were 55.3% and 55.8%, indicated that the water-soluble inorganic nitrogen species increased with the haze events. The correlation analysis showed that water-soluble organic carbon (WSOC), nss-SO42-, ammonium, and nitrate had good correlation coefficients between each other at Keelung, and the derived sources of WSOC were anthropogenic activities. The results of anthropogenic activities influence on secondary organic aerosol (SOA) formation. The N/P value in the soluble fraction of dry depositions under the haze events were above non-haze days, too much water-soluble inorganic nitrogen (WSIN) were cause by excess nitrogen (N) under the haze events. Our results indicated that Phosphorus is limiting factor for organism on the southern East China Sea.