A dual site study of the rainwater chemistry within the Western Pacific region

K. M. Wai, S. H. Wang, P. A. Tanner, N. H. Lin

研究成果: 雜誌貢獻期刊論文同行評審

8 引文 斯高帕斯(Scopus)


The two-year (1999-2000) rainwater chemistry at two monitoring sites in nearby coastal areas [Taiwan (TW) and Hong Kong (HK)] within the Western Pacific region has been studied. The volume weighted average pH values for the entire sampling period in TW and HK were 4.6 and 4.2, respectively. Sea salt Na + and Cl- were the most abundant species in the TW samples but SO42- and H+ were the most abundant in the HK samples. The sea salt and NH4+ concentrations at TW were higher than those at HK both in the cold and warm seasons. Chloride depletion was minimal in the rainwater samples at both sites. Non seasalt-SO42- was associated with NH4 +. Under the influence of the East Asian Winter Monsoon, the back-trajectory studies revealed that elevated anthropogenic species concentrations were associated with trajectories (1) very near to the continental boundary layer of Mainland China; or (2) along the coastline of Eastern China where large cities/industrial areas are located or (3) passing through the region of stagnant air over Northern/Eastern China. The lowest anthropogenic and crustal species concentrations measured in HK are associated with the summer monsoon and are attributed not only to the clean marine air masses but also to the relatively low SO2, NO x and NH3 emissions from the South/ South East Asian countries, as well as infrequent biomass burning activities and wet scavenging at sources during the summer months. Approaching tropical cyclones led to the lowest pH values (4.2 in TW and 3.8 in HK) amongst the other weather categories. The findings here have been compared with other studies within East Asia and elsewhere.

頁(從 - 到)85-103
期刊Journal of Atmospheric Chemistry
出版狀態已出版 - 5月 2007


深入研究「A dual site study of the rainwater chemistry within the Western Pacific region」主題。共同形成了獨特的指紋。