Inter-Relationships and Seasonal Variations of Inorganic Components of Pm10 in a Western Pacific Coastal City

Abstract

Abstract. Five year (1995Five year ( -1999 datasets for inorganic major and trace components in PM 10 from three monitoring sites in Hong Kong are presented. The concentrations of most chemical constituents show a high degree of seasonality, with high concentrations in winter but low ones in summer, resulting from the combined effects of summer monsoon scavenging and the influx of the continental air mass of the winter monsoon. High correlations exist within crustal components, as well as within sea-salt components. Non-seasalt sulphate and ammonium ion contributions to the PM 10 mass are similar at all sites and are greatest in the winter months, showing the importance of non-local contributions. The concentrations of chemical components in PM 10 from this study are compared with those in wet deposition in Hong Kong, as well as with PM 10 results from other countries. In general, the Asian countries experience more elevated concentrations of PM 10 .

Concentration characteristics of bromine and iodine in aerosols in Shanghai, China

“…Such variations could be caused by many factors including transport patterns, different source strength and weather conditions. Shanghai, similar to Hong Kong (Kan and Tanner, 2005), is influenced by southerly winds in summer, which transport marine aerosols (particulate Br and particulate I) from the East China Sea. The particulate Br and particulate I, however, did not exhibit summer maxima, and we ascribed this to the washout process by summer monsoon rains (15 rain days in August), which lowered their ambient concentrations.…”

Seasonal variations of air pollutant concentrations within Krasnoyarsk City

“…A decrease in concentrations during the summer can be explained by heavy rains and a well-developed mixing layer (Kan and Tanner 2005).…”