Biogeosciences
Biogeosciences
Biogeosciences
Articles | Volume 16, issue 24
Articles | Volume 16, issue 24
Biogeosciences, 16, 4747–4763, 2019
https://doi.org/10.5194/bg-16-4747-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Biogeosciences, 16, 4747–4763, 2019
https://doi.org/10.5194/bg-16-4747-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 16, issue 24

Research article 16 Dec 2019

Research article | 16 Dec 2019

Long-term trends in pH in Japanese coastal seawater

Miho Ishizu et al.

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Latest update: 19 Sep 2021
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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.
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