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The exposure of the Great Barrier Reef to ocean acidification

2016; Nature Portfolio; Volume: 7; Issue: 1 Linguagem: Inglês

10.1038/ncomms10732

2041-1723

Mathieu Mongin, Mark E. Baird, Bronte Tilbrook, Richard J. Matear, Andrew Lenton, Mike Herzfeld, Karen Wild-Allen, Jennifer Skerratt, Nugzar Margvelashvili, Barbara Robson, Carlos M. Duarte, Malin Gustafsson, Peter J. Ralph, Andy Steven,

Marine and fisheries research

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 (Ω a ). The downscaling of ocean acidification projections from global to GBR scales requires the set of regional drivers controlling Ω a to be resolved. Here we use a regional coupled circulation–biogeochemical model and observations to estimate the Ω a experienced by the 3,581 reefs of the GBR, and to apportion the contributions of the hydrological cycle, regional hydrodynamics and metabolism on Ω a variability. We find more detail, and a greater range (1.43), than previously compiled coarse maps of Ω a of the region (0.4), or in observations (1.0). Most of the variability in Ω a is due to processes upstream of the reef in question. As a result, future decline in Ω a is likely to be steeper on the GBR than currently projected by the IPCC assessment report.