Title

Coral reefs will transition to net dissolving before end of century

Document Type

Article

Publication details

Eyre, BC, Cyronak, T, Drupp, P, De Carlo, EH, Sachs, JP & Andersson, AJ 2018, 'Coral reefs will transition to net dissolving before end of century', Science, vol. 359, no. 6378, pp. 908-911.

Published version available from:

https://dx.doi.org/10.1126/science.aao1118

Peer Reviewed

Peer-Reviewed

Abstract

Ocean acidification refers to the lowering of the ocean’s pH due to the uptake of anthropogenic CO2 from the atmosphere. Coral reef calcification is expected to decrease as the oceans become more acidic. Dissolving calcium carbonate (CaCO3) sands could greatly exacerbate reef loss associated with reduced calcification but is presently poorly constrained. Here we show that CaCO3 dissolution in reef sediments across five globally distributed sites is negatively correlated with the aragonite saturation state (War) of overlying seawater and that CaCO3 sediment dissolution is 10-fold more sensitive to ocean acidification than coral calcification. Consequently, reef sediments globally will transition from net precipitation to net dissolution when seawater War reaches 2.92 ± 0.16 (expected circa 2050 CE). Notably, some reefs are already experiencing net sediment dissolution.

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