Monthly and annually proxy and growth parameter from a core of Porites australiensis from Lizard Island between 1938 - 2018 ...

• Main Authors: D'Olivo, Juan Pablo, Ellwood, George, DeCarlo, Thomas M, McCulloch, Malcolm T
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2019
• Subjects: boron isotopes; calcification; Coral; Geochemistry; FOS Earth and related environmental sciences; Ocean acidification; Porites
• Online Access: https://dx.doi.org/10.1594/pangaea.906242; https://doi.pangaea.de/10.1594/PANGAEA.906242

Identifying the long-term effects of ocean acidification (OA) and global warming on coral calcification has proven elusive yet has major implications for the continuing viability of coral reefs in the face of climate change. Here we address this question using seasonally and annually resolved boron proxies (11B/10B and B/Ca) of calcifying fluid (cf) pHcf and carbonate ion concentrations ([CO]cf) preserved in a long-lived Porites coral from the Great Barrier Reef (GBR). From 1939 to 2013 we find that the coral pHcf closely followed the decline in seawater pH of ∼0.1 units, but at a reduced rate of ∼60%, indicative of biological buffering. Of the decline in pHcf ∼82% is attributed to OA and ∼17% to the ∼0.5 °C long-term warming observed over this period. This long-term warming induced change in pHcf is consistent with the much larger seasonally modulated changes in pHcf where ∼4 to 6 °C seasonal changes in temperatures are accompanied by relatively large antithetic ∼0.1 changes in pHcf. Furthermore, we find ... : Supplement to: D'Olivo, Juan Pablo; Ellwood, George; DeCarlo, Thomas M; McCulloch, Malcolm T (2019): Deconvolving the long-term impacts of ocean acidification and warming on coral biomineralisation. Earth and Planetary Science Letters, 526, 115785 ...