State and trends of Australia’s oceans: ocean acidification

The pH and aragonite saturation state of surface seawaters around Australia
are influenced by the large-scale circulation, and superimposed on this are the
effects of seasonal changes due largely to biological activity and temperature
change. Maximum values of aragonite saturation state tend to develop over
summer-early autumn, while pH values are typically greatest in winter.
Biological production contributes to increases of both pH and aragonite
saturation state in the spring-summer, while warming acts to increase the
saturation state and decrease pH. Seasonal ranges of both variables are
already estimated to be outside the ranges that many of Australia’s marine
ecosystems are likely to have experienced in the late 1800s.

Tilbrook B., Oiijen E. V., Neill C., Berry K., Ak J., Passmore A., Black J., Lenton A. & Richardson A. J., 2020. Integrated Marine Observing System State and Trends of Australia’s Oceans, 4p. Report.

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