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    The exposure of the Great Barrier Reef to ocean acidification

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    Type
    Article
    Authors
    Mongin, Mathieu
    Baird, Mark E.
    Tilbrook, Bronte
    Matear, Richard J.
    Lenton, Andrew
    Herzfeld, Mike
    Wild-Allen, Karen
    Skerratt, Jenny
    Margvelashvili, Nugzar
    Robson, Barbara J.
    Duarte, Carlos M. cc
    Gustafsson, Malin S. M.
    Ralph, Peter J.
    Steven, Andrew D. L.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2016-02-23
    Online Publication Date
    2016-02-23
    Print Publication Date
    2016-04
    Permanent link to this record
    http://hdl.handle.net/10754/597083
    
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    Abstract
    The Great Barrier Reef (GBR) is founded on reef-building corals. Corals build their exoskeleton with aragonite, but ocean acidification is lowering the aragonite saturation state of seawater (Ωa). The downscaling of ocean acidification projections from global to GBR scales requires the set of regional drivers controlling Ωa to be resolved. Here we use a regional coupled circulation–biogeochemical model and observations to estimate the Ωa experienced by the 3,581 reefs of the GBR, and to apportion the contributions of the hydrological cycle, regional hydrodynamics and metabolism on Ωa variability. We find more detail, and a greater range (1.43), than previously compiled coarse maps of Ωa of the region (0.4), or in observations (1.0). Most of the variability in Ωa is due to processes upstream of the reef in question. As a result, future decline in Ωa is likely to be steeper on the GBR than currently projected by the IPCC assessment report.
    Citation
    The exposure of the Great Barrier Reef to ocean acidification 2016, 7:10732 Nature Communications
    Sponsors
    This study was undertaken with the support of CSIRO Oceans and Atmosphere, and through resources made available through the eReefs project, the CSIRO Marine and Coastal Carbon Biogeochemistry Cluster, and the Australian Climate Change Science Program. The observations at Yongala were sourced as part of the Integrated Marine Observing System (IMOS)—IMOS is supported by the Australian Government through the National Collaborative Research Infrastructure Strategy and the Super Science Initiative. We thank Sven Uthicke for making his observations publically available, Professorss Tom Trull and Sabina Belli for their constructive comments on the manuscript, Miles Furnas who willingly shared his knowledge of the region and provided observations and three anonymous reviewers.
    Publisher
    Springer Nature
    Journal
    Nature Communications
    DOI
    10.1038/ncomms10732
    PubMed ID
    26907171
    Additional Links
    http://www.nature.com/doifinder/10.1038/ncomms10732
    ae974a485f413a2113503eed53cd6c53
    10.1038/ncomms10732
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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