Japan Agency for Marine-Earth Science and Technology, Environmental
Variability Prediction and Application Research Group, Yokohama Institute
for Earth Sciences, 3173-25 Showa-machi, Kanagawa Ward, Yokohama, Kanagawa 236-0001,
Japan
Yasumasa Miyazawa
Japan Agency for Marine-Earth Science and Technology, Environmental
Variability Prediction and Application Research Group, Yokohama Institute
for Earth Sciences, 3173-25 Showa-machi, Kanagawa Ward, Yokohama, Kanagawa 236-0001,
Japan
Tomohiko Tsunoda
The Ocean Policy Research Institute of the Sasakawa Peace Foundation,
1-15-16, Toranomon Minato Ward, Tokyo 105-8524, Japan
Tsuneo Ono
Japan Fisheries Research Education Agency, 15F Queen's Tower B, 2-3-3 Minato
Mirai, Nishi Ward, Yokohama, Kanagawa 220-6115, Japan
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Using water quality data collected at 289 monitoring sites as part of the Water Pollution Control Program, we evaluated the long-term trends of pH in Japanese coastal seawater at ambient temperature from 1978 to 2009. We found that the annual maximum pH, which generally represents the pH of surface waters in winter, had decreased at 75 % of the sites, but had increased at the remaining sites. The annual maximum pH decreased at an average rate of −0.0024 yr−1, with relatively large deviations.
Using water quality data collected at 289 monitoring sites as part of the Water Pollution...