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- Title
Some Insights into Atmospheric Processes Involving Urban Sulphur and Nitrogen in and around Hong Kong, SAR.
- Authors
Sequeira, Ronald
- 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 aerosol and in wet and dry depositions were estimated. A limited supplementary data set on various canopy depositions was also utilized. This information collectively suggests several basic differences in photochemical processes between the urban atmospheres in and around Hong Kong and the classical, smoggy Los Angeles. This is also supported by the typical diurnal variation of nitrogen oxides in Hong Kong, which suggests a more efficient photo-oxidation of NO to NO2 within the territory and in nearby areas upwind, as compared to further oxidation to the 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 advected fraction of non-sea salt aerosol sulphate in the territory could be 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.
- Subjects
HONG Kong (China); CHINA; ATMOSPHERE; CITIES &; towns; SULFUR; NITROGEN
- Publication
Water, Air & Soil Pollution, 2002, Vol 137, Issue 1-4, p317
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/A:1015576907468