Some Insights into Atmospheric Processes Involving Urban Sulphur and Nitrogen in and around Hong Kong,SAR |
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| Authors: | Sequeira Ronald |
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| Institution: | 1. Department of Biology and Chemistry, City University of Hong Kong Kowloon, Hong Kong, SAR, China
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| Abstract: | The representative mass ratio of the reactive airborne sulphur-to-nitrogen, S/N in the gas and aerosol phases, and in wet and dry deposition over the territory of Hong Kong, SAR,was determined, utilizing available data for the 12 yr period, 1986–1997. Using this information, the representative stoichiometric ratio values for sulphate-to-nitrate in aerosoland in wet and dry depositions were estimated. A limited supplementary data set on various canopy depositions was alsoutilized. This information collectively suggests several basicdifferences in photochemical processes between the urbanatmospheres in and around Hong Kong and the classical, smoggyLos Angeles. This is also supported by the typical diurnal variation of nitrogen oxides in Hong Kong, which suggests a moreefficient photo-oxidation of NO to NO2 within the territoryand in nearby areas upwind, as compared to further oxidation tothe NO3 (or nitrate) stage. On the other hand, the relatively low gas-to-particle ratio value estimated for S (～3) relative to N (～26) suggests that the advectedfraction of non-sea salt aerosol sulphate in the territory couldbe considerably greater than the corresponding fraction for nitrate. Finally, significant losses (probably related to sampling) of NH4-NH3 in dry deposition could be inferred, while for SO4 in wet deposition, a moderate enrichment factor of ～2 is observed in relation to SO4 in aerosol. |
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