Long-Term Declining Trends in River Water pH in Central Japan

pH monitoring data for public water bodies in Niigata and Gifu prefectures in central Japan were tested by the nonparametric seasonal Mann–Kendall method to evaluate long-term acidification. A significant long-term declining trend in river water pH was found in several watersheds in Niigata and Gifu...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2009-06, Vol.200 (1-4), p.253-265
Main Authors: Matsubara, Hiroki, Morimoto, Shingo, Sase, Hiroyuki, Ohizumi, Tsuyoshi, Sumida, Hiroshi, Nakata, Makoto, Ueda, Hiromasa
Format: Article
Language:English
Subjects:
Acid deposition
Acidification
Acidity
Acids
Applied sciences
Atmospheric Protection/Air Quality Control/Air Pollution
Climate Change/Climate Change Impacts
Continental surface waters
Drainage
Earth and Environmental Science
Earth sciences
Earth, ocean, space
Emissions
Engineering and environment geology. Geothermics
Environment
Environmental monitoring
Environmental science
Exact sciences and technology
Freshwater
Geology
Hot springs
Hydrogeology
Land use
Natural water pollution
Outdoor air quality
pH effects
Pollutant deposition
Pollution
Pollution, environment geology
Public waters
Rivers
Soil Science & Conservation
Stone
Stream flow
Studies
Trends
Water pollution
Water quality
Water Quality/Water Pollution
Water treatment and pollution
Watersheds
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Summary:pH monitoring data for public water bodies in Niigata and Gifu prefectures in central Japan were tested by the nonparametric seasonal Mann–Kendall method to evaluate long-term acidification. A significant long-term declining trend in river water pH was found in several watersheds in Niigata and Gifu prefectures. In Niigata, the declining trend was observed only in areas receiving drainage from granitic rocks, and the acid neutralizing capacity of the river waters was in fact low in those areas. In Gifu, a declining trend was observed in some remote watersheds, where there was no clear relationship between the geology and the long-term trends. Since Niigata and Gifu receive the highest level of acid loading from the atmosphere in Japan, river water acidification in several watersheds may be attributable to the effects of the acid deposition. Other factors, such as hot spring drainage, changes in land use, and natural sea salt deposition, cannot adequately explain the acidification phenomena observed in this study.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-008-9909-3