Comparative field study on precipitation, throughfall, stemflow, fog water, and atmospheric aerosol and gases at urban and rural sites in Japan
| Autor: | Masahide Aikawa, Takatoshi Hiraki, Motonori Tamaki |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Rural Population
Environmental Engineering Stemflow Rain Risk Assessment Niebla Japan medicine Chemical Precipitation Environmental Chemistry Cities Waste Management and Disposal Chemical composition Aerosols Hydrology Air Pollutants Geography biology Water Hydrogen-Ion Concentration Seasonality biology.organism_classification medicine.disease Throughfall Pollution Aerosol Deposition (aerosol physics) Environmental chemistry Gases Seasons Interception Environmental Monitoring |
| Zdroj: | Science of The Total Environment. 366:275-285 |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2005.06.027 |
| Popis: | Precipitation collected by a wet-only sampler (WP), precipitation collected by a filtering-type bulk sampler (BP), throughfall (TF), stemflow (SF), fog water (FW), and atmospheric aerosol and gases were collected at two sites with different site classifications: an urban site (Mt. Rokko) and a rural site (Mt. Awaga) to investigate canopy-atmosphere interactions and to study the chemistry of precipitation in forested areas located in different atmospheric conditions. Compared to those at the rural site, the monthly volume-weighted pH values at the urban site were not significantly (p0.05) different for WP, higher (p0.05) for BP, not significantly (p0.05) different for TF, lower (p0.01) for SF, and lower (p0.01) for FW. The order of mean pH values at the urban site was FWSFWPTFBP. In contrast, the order at the rural site was FWSFBPWPTF. Concentrations of chemical species at the urban site were higher than those at the rural site in all samples and all chemical species. In particular, higher NO(3)(-) concentrations at the urban site were observed in all samples. The amount of dry deposition on leaves at the urban site was approximately 1.17 times larger than that at the rural site. The monthly net TF (=TF-BP) in autumn seemed to be larger than that in summer; this trend was remarkable in K(+). The monthly NO(3)(-) deposition in the net TF was larger at the urban site than at other parameters and at the rural site. The concentrations of chemical species in aerosol and gases that were measured near the central part of Kobe City were ca. 3.4 times higher than those in the rural area. Mt. Rokko borders the central part of the city, which caused the concentrations at Mt. Rokko to be higher than those at Mt. Awaga. The deposition amounts at Mt. Rokko were larger than those at Mt. Awaga, which probably can be attributed to the higher concentrations of chemical species in atmospheric aerosol and gases. |
| Databáze: | OpenAIRE |
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