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

DOI

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 that although the supply of dissolved inorganic carbon (DIC) of the coral cf has remained at constant elevated levels of ∼1.5 × seawater, there has been a significant long-term decline (4 to 11%) in the [CO]cf, due primarily to the OA-induced change in pHcf. This decline in [CO]cf, a critical parameter controlling calcification, is thus likely responsible for the ∼15% decline in coral calcification observed since 1939 and across the GBR generally.

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

Identifier
DOI https://doi.org/10.1594/PANGAEA.906242
Related Identifier IsSupplementTo https://doi.org/10.1016/j.epsl.2019.115785
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.906242
Provenance
Creator D'Olivo, Juan Pablo ORCID logo; Ellwood, George; DeCarlo, Thomas M; McCulloch, Malcolm T ORCID logo
Publisher PANGAEA
Publication Year 2019
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Representation
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 4 datasets
Discipline Earth System Research
Spatial Coverage (145.439 LON, -14.689 LAT)