Measurements of microbial processes, dissolution, water and porewater chemistry during experiments on two coral reef sediments

DOI

Two coral reef sediments have been subjected to OA scenarios in the laboratory. Sediments from Magnetic Island (year 2014, 3 pCO2 treatments) were investigated under diffusive conditions in flumes. Parameters studied were: oxygen fluxes, porewater pH and oxygen concentrations. Sulfate reduction rates and pigment concentrations as a measure for microphytobenthos abundance were measured at the end of the experiment. Sediments from Davies Reef (year 2015, 2 pCO2 treatments) were studied under advective conditions using stirred chambers. Microphytobenthos growth over the experimental period was studied using hyperspectral imaging. Porewater pH profiles were measured in different regions of the chambers. Fluxes of oxygen, total alkalinity (as a measure of CaCO3 dissolution), dissolved organic carbon and nutrients were measured using incubations. Pigment concentrations were measured at the end of the experiment as a measure for microphytobenthos abundance and to calibrate the hyperspectral imaging results. In both experiments, elevated pCO2 did not affect biotic processes. Elevated pCO2 caused an increase in dissolution of the Davies Reef sediments. The porewater pH measurements indicated that this is likely caused by the dissolution of high-magnesium calcites.

Supplement to: Fink, Artur; den Haan, Joost; Chennu, Arjun; Uthicke, Sven; de Beer, Dirk (2017): Ocean Acidification Changes Abiotic Processes but Not Biotic Processes in Coral Reef Sediments. Frontiers in Marine Science, 4

Identifier
DOI https://doi.org/10.1594/PANGAEA.873838
Related Identifier https://doi.org/10.3389/fmars.2017.00073
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.873838
Provenance
Creator Fink, Artur; den Haan, Joost; Chennu, Arjun ORCID logo; Uthicke, Sven ORCID logo; de Beer, Dirk ORCID logo
Publisher PANGAEA
Publication Year 2017
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 10 datasets
Discipline Earth System Research
Temporal Coverage Begin 2014-01-01T00:00:00Z
Temporal Coverage End 2015-05-31T00:00:00Z