Articles | Volume 16, issue 24
https://doi.org/10.5194/bg-16-4747-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-16-4747-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
16 Dec 2019
Research article |
| 16 Dec 2019
| 16 Dec 2019
Long-term trends in pH in Japanese coastal seawater
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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Cited
14 citations as recorded by crossref.
- Short-term variation in pH in seawaters around coastal areas of Japan: characteristics and forcings T. Ono et al. 10.5194/bg-21-177-2024
- Recent events and climate change impacts related to the environment, ecosystem, and fishery resources in northern Japanese coastal lagoons H. Abe & M. Nakaoka 10.1016/j.ecss.2025.109251
- Rapid Reduction of pH and CaCO3 Saturation State in the Tsugaru Strait by the Intensified Tsugaru Warm Current During 2012–2019 M. Wakita et al. 10.1029/2020GL091332
- Long-term variations in pH in coastal waters along the Korean Peninsula Y. Lee et al. 10.5194/bg-22-675-2025
- Acidification state and interannual variability in marginal sea: A case study of the Bohai and the Yellow Seas surface waters in April 2023 Z. Wang et al. 10.1016/j.envres.2024.119536
- Conservation of the coral community and local stakeholders’ perceptions of climate change impacts: Examples and gap analysis in three Japanese national parks H. Abe et al. 10.1016/j.ocecoaman.2022.106042
- Ocean Acidification State in the Highly Eutrophic Tokyo Bay, Japan: Controls on Seasonal and Interannual Variability M. Yamamoto-Kawai et al. 10.3389/fmars.2021.642041
- Spatial characteristics of seawater pCO<sub>2</sub> in the Seto Inland Sea and adjacent region M. Fujita et al. 10.5928/kaiyou.33.5-6_77
- Multiple nitrogen sources for primary production inferred fromδ13C andδ15N in the southern Sea of Japan T. Kodama et al. 10.5194/bg-20-3667-2023
- Carbon and nitrogen dynamics in the coastal Sea of Japan inferred from 15 years of measurements of stable isotope ratios of Calanus sinicus K. Nakamura et al. 10.5194/os-18-295-2022
- Eelgrass beds can mitigate local acidification and reduce oyster malformation risk in a subarctic lagoon, Japan: A three-dimensional ecosystem model study H. Abe et al. 10.1016/j.ocemod.2022.101992
- Decadal vision in oceanography 2021: Coastal oceans S. Kida et al. 10.5928/kaiyou.30.5_87
- Interannual sea-level variation around mainland Japan forced by subtropical North Pacific wind and its possible impact on the Tsugaru warm current A. Nagano et al. 10.1007/s10236-023-01580-w
- A starch-based, crosslinked blend film with seawater-specific dissolution characteristics Y. Jia et al. 10.1016/j.carbpol.2022.120181
14 citations as recorded by crossref.
- Short-term variation in pH in seawaters around coastal areas of Japan: characteristics and forcings T. Ono et al. 10.5194/bg-21-177-2024
- Recent events and climate change impacts related to the environment, ecosystem, and fishery resources in northern Japanese coastal lagoons H. Abe & M. Nakaoka 10.1016/j.ecss.2025.109251
- Rapid Reduction of pH and CaCO3 Saturation State in the Tsugaru Strait by the Intensified Tsugaru Warm Current During 2012–2019 M. Wakita et al. 10.1029/2020GL091332
- Long-term variations in pH in coastal waters along the Korean Peninsula Y. Lee et al. 10.5194/bg-22-675-2025
- Acidification state and interannual variability in marginal sea: A case study of the Bohai and the Yellow Seas surface waters in April 2023 Z. Wang et al. 10.1016/j.envres.2024.119536
- Conservation of the coral community and local stakeholders’ perceptions of climate change impacts: Examples and gap analysis in three Japanese national parks H. Abe et al. 10.1016/j.ocecoaman.2022.106042
- Ocean Acidification State in the Highly Eutrophic Tokyo Bay, Japan: Controls on Seasonal and Interannual Variability M. Yamamoto-Kawai et al. 10.3389/fmars.2021.642041
- Spatial characteristics of seawater pCO<sub>2</sub> in the Seto Inland Sea and adjacent region M. Fujita et al. 10.5928/kaiyou.33.5-6_77
- Multiple nitrogen sources for primary production inferred fromδ13C andδ15N in the southern Sea of Japan T. Kodama et al. 10.5194/bg-20-3667-2023
- Carbon and nitrogen dynamics in the coastal Sea of Japan inferred from 15 years of measurements of stable isotope ratios of Calanus sinicus K. Nakamura et al. 10.5194/os-18-295-2022
- Eelgrass beds can mitigate local acidification and reduce oyster malformation risk in a subarctic lagoon, Japan: A three-dimensional ecosystem model study H. Abe et al. 10.1016/j.ocemod.2022.101992
- Decadal vision in oceanography 2021: Coastal oceans S. Kida et al. 10.5928/kaiyou.30.5_87
- Interannual sea-level variation around mainland Japan forced by subtropical North Pacific wind and its possible impact on the Tsugaru warm current A. Nagano et al. 10.1007/s10236-023-01580-w
- A starch-based, crosslinked blend film with seawater-specific dissolution characteristics Y. Jia et al. 10.1016/j.carbpol.2022.120181
Latest update: 27 Jun 2025
Short summary
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...
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