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- Title
Small-Scale Horizontal Variations in Ionic Concentrations of Bulk Deposition from Hong Kong.
- Authors
Tanner, Peter A.; Tam Wing Fai
- Abstract
The concentrations of major anions and cations in bulk deposition were found to vary spatially by factors of up to 65, for two samplings at 17 sampling sites separated by 45 km or less in the Territory of Hong Kong. Under predominantly maritime airstreams, these variations resulted from local emissions, as well as from lower seasalt concentrations at the more northerly sites. The weak acidity of the bulk deposition resulted from neutralization of hydrometeors by basic particulate matter, leading to an unusual anticorrelation of the concentrations of non-seasalt sulphate and hydrogen ions. Greater anthropogenic activity at inland and industrial sites was generally marked by higher nitrate concentrations, with the ratio of nitrate ion concentrations from the two samplings being strongly correlated with that of calcium ion. Chloride loss increased with increasing concentrations of non-seasalt nitrate and sulphate. Most of the variance in the bulk deposition data for 8 major anions and cations could be explained by 2 factors: seasalt and anthropogenic, in common with the 1997 Environmental Protection Department data for these species in total suspended particulate matter. Results for 14 soluble trace metal species in the bulk deposition at the sites are also reported.
- Subjects
HONG Kong (China); CHINA; SEDIMENTATION &; deposition; ANIONS; CATIONS; EMISSIONS (Air pollution); SEA salt; SOIL acidity; HYDROMETEOROLOGY; HYDROGEN ions
- Publication
Water, Air & Soil Pollution, 2000, Vol 122, Issue 3-4, p433
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/A:1005245222016