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Deep oceans may acidify faster than anticipated due to global warming

Abstract

Oceans worldwide are undergoing acidification due to the penetration of anthropogenic CO2 from the atmosphere1,2,3,4. The rate of acidification generally diminishes with increasing depth. Yet, slowing down of the thermohaline circulation due to global warming could reduce the pH in the deep oceans, as more organic material would decompose with a longer residence time. To elucidate this process, a time-series study at a climatically sensitive region with sufficient duration and resolution is needed. Here we show that deep waters in the Sea of Japan are undergoing reduced ventilation, reducing the pH of seawater. As a result, the acidification rate near the bottom of the Sea of Japan is 27% higher than the rate at the surface, which is the same as that predicted assuming an air–sea CO2 equilibrium. This reduced ventilation may be due to global warming and, as an oceanic microcosm with its own deep- and bottom-water formations, the Sea of Japan provides an insight into how future warming might alter the deep-ocean acidification.

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Fig. 1: Station locations in the Sea of Japan.
Fig. 2: Secular trend of AOU at various depths between 1950 and 2015.
Fig. 3: Secular trend of pH at various depths between 1965 and 2015.
Fig. 4: Rate of temporal changes of pH at various depths between 1965 and 2015.

References

  1. 1.

    Dore, J. E., Lukas, R., Sadler, D. W., Church, M. J. & Karl, D. M. Physical and biogeochemical modulation of ocean acidification in the central North Pacific. Proc. Natl Acad. Sci. USA 106, 12235–12240 (2009).

    CAS  Article  Google Scholar 

  2. 2.

    Santana-Casiano, J. M., Gonzalez-Davila, M., Rueda, M. J., Llinas, O. & Gonzalez-Davila, E. F. The interannual variability of oceanic CO2 parameters in the northeast Atlantic subtropical gyre at the ESTOC site. Glob. Biogeochem. Cycle 21, GB1015 (2007).

  3. 3.

    Bates, N. R. Interannual variability of the oceanic CO2 sink in the subtropical gyre of the North Atlantic Ocean over the last 2 decades. J. Geophys. Res.-Oceans 112, C09013 (2007).

  4. 4.

    Lui, H. K. & Chen, C. T. A. Deducing acidification rates based on short-term time series. Sci. Rep. 5, 11517 (2015).

    Article  Google Scholar 

  5. 5.

    Le Quere, C., Takahashi, T., Buitenhuis, E. T., Rodenbeck, C. & Sutherland, S. C. Impact of climate change and variability on the global oceanic sink of CO2. Glob. Biogeochem. Cycle 24, GB4007 (2010).

  6. 6.

    Ridgwell, A. & Schmidt, D. N. Past constraints on the vulnerability of marine calcifiers to massive carbon dioxide release. Nat. Geosci. 3, 196–200 (2010).

    CAS  Article  Google Scholar 

  7. 7.

    Thomas, E. Ocean acidification – How will ongoing ocean acidification affect marine life? (Past). PAGES news 20, 37 (2012).

    Article  Google Scholar 

  8. 8.

    Kleypas, J. A. & Yates, K. K. Coral reefs and ocean acidification. Oceanography 22, 108–117 (2009).

    Article  Google Scholar 

  9. 9.

    Barry, J. P., Buck, K. R., Lovera, C., Kuhnz, L. & Whaling, P. J. Utility of deep sea CO2 release experiments in understanding the biology of a high-CO2 ocean: Effects of hypercapnia on deep sea meiofauna. J. Geophys. Res. Oceans https://doi.org/10.1029/2004jc002629 (2005).

  10. 10.

    Riebesell, U. & Tortell, P. D. in Ocean Acidification (eds Gattuso J. P. & Hansson L.) 99–121 (Oxford Univ. Press, Oxford, 2011).

  11. 11.

    Gattuso, J. P. Ocean acidification – How will ongoing ocean acidification affect marine life? Present. PAGES news 20, 36 (2012).

    Article  Google Scholar 

  12. 12.

    Feely, R. A. & Chen, C. T. A. The effect of excess CO2 on the calculated calcite and aragonite saturation horizons in the Northeast Pacific. Geophys. Res. Lett. 9, 1294–1297 (1982).

    CAS  Article  Google Scholar 

  13. 13.

    Feely, R. A. et al. Impact of anthropogenic CO2 on the CaCO3 system in the oceans. Science 305, 362–366 (2004).

    CAS  Article  Google Scholar 

  14. 14.

    Sabine, C. L. et al. The oceanic sink for anthropogenic CO2. Science 305, 367–371 (2004).

    CAS  Article  Google Scholar 

  15. 15.

    Feely, R. A. et al. The combined effects of ocean acidification, mixing, and respiration on pH and carbonate saturation in an urbanized estuary. Estuar. Coast. Shelf Sci. 88, 442–449 (2010).

    CAS  Article  Google Scholar 

  16. 16.

    Cai, W. J. et al. Acidification of subsurface coastal waters enhanced by eutrophication. Nat. Geosci. 4, 766–770 (2011).

    CAS  Article  Google Scholar 

  17. 17.

    Senjyu, T. et al. Benthic front and the Yamato Basin Bottom Water in the Japan Sea. J. Oceanogr. 61, 1047–1058 (2005).

    CAS  Article  Google Scholar 

  18. 18.

    Gamo, T. Global warming may have slowed down the deep conveyor belt of a marginal sea of the northwestern Pacific: Japan Sea. Geophys. Res. Lett. 26, 3137–3140 (1999).

    Article  Google Scholar 

  19. 19.

    Chen, C. T. A., Bychkov, A. S., Wang, S. L. & Pavlova, G. Y. An anoxic Sea of Japan by the year 2200? Mar. Chem. 67, 249–265 (1999).

    CAS  Article  Google Scholar 

  20. 20.

    Kim, K. et al. Warming and structural changes in the East (Japan) Sea: A clue to future changes in global oceans? Geophys. Res. Lett. 28, 3293–3296 (2001).

    Article  Google Scholar 

  21. 21.

    Watanabe, Y. W., Wakita, M., Maeda, N., Ono, T. & Gamo, T. Synchronous bidecadal periodic changes of oxygen, phosphate and temperature between the Japan Sea deep water and the North Pacific intermediate water. Geophys. Res. Lett. 30, 2273 (2003).

  22. 22.

    Chen, C. T. A. & Wang, S. L. Carbonate chemistry of the sea of Japan. J. Geophys. Res.-Oceans 100, 13737–13745 (1995).

    Article  Google Scholar 

  23. 23.

    Wong, G. T. F. & Li, K.-Y. Winkler’s method overestimates dissolved oxygen in seawater: Iodate interference and its oceanographic implications. Mar. Chem. 115, 86–91 (2009).

    CAS  Article  Google Scholar 

  24. 24.

    Hatta, M. & Zhang, J. Possible source of advected water mass and residence times in the multi-structured Sea of Japan using rare earth elements. Geophys. Res. Lett. 33, L16606 (2006).

  25. 25.

    Chen, C. T. A., Gong, G. C., Wang, S. L. & Bychkov, A. S. Redfield ratios and regeneration rates of particulate matter in the Sea of Japan as a model of closed system. Geophys. Res. Lett. 23, 1785–1788 (1996).

    CAS  Article  Google Scholar 

  26. 26.

    Park, G.-H., Lee, K. & Tishchenko, P. Sudden, considerable reduction in recent uptake of anthropogenic CO2 by the East/Japan Sea. Geophys. Res. Lett. 35, L23611 (2008).

  27. 27.

    Park, G.-H. et al. Large accumulation of anthropogenic CO2 in the East (Japan) Sea and its significant impact on carbonate chemistry. Glob. Biogeochem. Cycle, 20, BG4013 (2006).

  28. 28.

    Millero, F. J. The marine inorganic carbon cycle. Chem. Rev. 107, 308–341 (2007).

    CAS  Article  Google Scholar 

  29. 29.

    Kim, T. W. et al. Prediction of Sea of Japan (East Sea) acidification over the past 40 years using a multiparameter regression model. Glob. Biogeochem. Cycle 24, GB3005 (2010).

  30. 30.

    Byrne, R. H., Mecking, S., Feely, R. A. & Liu, X. Direct observations of basin-wide acidification of the North Pacific Ocean. Geophys. Res. Lett. 37, L02601 (2010).

  31. 31.

    Chen, C. T. in Solubility Data Series Vol. 7 Oxygen and Ozone (ed. Battino R.) 41-55 (Pergamon Press, London, 1981).

  32. 32.

    Pierrot, D., Lewis, E. & Wallace, D. W. R. MS Excel Program Developed for CO2 System Calculations. ORNL/CDIAC-105a (Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, Tennessee, 2006).

    Google Scholar 

  33. 33.

    Lueker, T. J., Dickson, A. G. & Keeling, C. D. Ocean pCO2 calculated from dissolved inorganic carbon, alkalinity, and equations for K1 and K2; validation based on laboratory measurements of CO2 in gas and seawater at equilibrium. Mar. Chem. 70, 105–119 (2000).

    CAS  Article  Google Scholar 

  34. 34.

    Dickson, A. G., Sabine, C. L. & Christian, J. R. Guide to Best Practices for Ocean CO 2 Measurements PICES Special Publication, 3 (Sidney, British Columbia, North Pacific Marine Science Organization, 2007).

  35. 35.

    Orr, J. C., Epitalon, J.-M. & Gattuso, J.-P. Comparison of ten packages that compute ocean carbonate chemistry. Biogeosciences 12, 1483–1510 (2015).

    Article  Google Scholar 

  36. 36.

    Dickson, A. G. Standard potential of the reaction: AgCl(s)+0.5H2(g)=Ag(s)+HCl(aq), and the standard acidity constant of the ion HSO4 in synthetic seawater from 273.15 to 318.15 K. J. Chem. Therrmodyn. 22, 113–127 (1990).

    CAS  Article  Google Scholar 

Download references

Acknowledgements

The authors would like to thank the Aim for the Top University Program of Taiwan (04 C030204) and the Ministry of Science and Technology of Taiwan (contracts MOST104-2611-M-110-015, MOST104-2611-M-110-016 and MOST104-2811-M-110-013) for financially supporting this research.

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The paper was designed by C.-T.A.C. and written mainly by C.-T.A.C. and partly by H.-K.L. Most of the data mining and statistical analysis was performed by C.-H.H. and H.-K.L. T.Y., N.K., M.I. and G.-C.G. provided the information on QA/QC for the JMA and KEEP-MASS data. All authors read and commented on the final version of the manuscript.

Corresponding authors

Correspondence to Chen-Tung Arthur Chen or Hon-Kit Lui.

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Chen, CT.A., Lui, HK., Hsieh, CH. et al. Deep oceans may acidify faster than anticipated due to global warming. Nature Clim Change 7, 890–894 (2017). https://doi.org/10.1038/s41558-017-0003-y

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