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Download Downscaling climate model projections of coral bleaching
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Climate model projections of acidification and thermal bleaching in the world’s coral reef areas Ruben van Hooidonk1 and Jeffrey Maynard2-4 1 – NOAA AOML, 2 – Marine Applied Research Ctr, 3 – Cornell University; 4 – CRIOBE/EPHE/CNRS Zooxanthellae Coral bleaching Ocean Acidification Graphic: www.earthonlinemedia.com “ By approximately 2050 sea temperatures in tropical oceans will experience anomalies every year that will be several times those seen in 1998.” -O. Hoegh-Guldberg. Hoegh-Guldberg (1999) Problem and opportunity: What does our current understanding of regional and global climate and projected climate change suggest the future holds for coral reefs in my jurisdiction? The objective of our collaborative work with PICCC: To produce ensemble-based projections for all four RCP scenarios for both thermal coral bleaching and ocean acidification and to make projections available as maps within a publicly accessible interactive Google Earth-based tool. ?? DHWs – the accumulation of temperature stress NOAA Coral Reef Watch graphic “Based on the observations used, the associated global average and median optimal DHW threshold are 6.1 DHWs.” (van Hooidonk and Huber 2009) Temporary refugia for coral reefs in a warming world - There are few refugia from these conditions but they are temporary - Annual exceedance of 6 Degree Heating Weeks (DHWs) by 2050 Nature Climate Change (2013) Effect of reducing/stabilising emissions van Hooidonk, Maynard, and Planes (2013) van Hooidonk, Maynard, and Planes (2013) Opposite latitudinal gradients in projected ocean acidification and bleaching impacts on coral reefs Switch to higher bleaching threshold of 8 DHWs These conditions exceed current tolerance limits of most coral species. Global Change Biology (2013) (a) Timing of onset of >8DHWs occurring annually (b) Ωarag at time of (a) (c) Abs value reductions in Ωarag between 2006 and (a) (d) Map in in (c) expressed as a percentage van Hooidonk et al. (2013) Acidification and calcification 7 15 23 Opposite latitudinal gradients in projected ocean acidification and bleaching impacts on coral reefs Aragonite saturation state Degree Heating Weeks High Latitude Reefs 5 % 5 % 2020 2040 2060 Low Latitude Reefs 2080 2100 Latitude increasing Introduction page NOAA Coral Reef Watch site visitation; PICCC site on page for projections visited by people from 80+ countries http://coralreefwatch.noaa.gov/climate/projections/piccc_oa_and_bleaching/index.php Downscaling climate model projections of coral bleaching van Hooidonk, Maynard et al. (in revision) Downscaling climate model projections of coral bleaching van Hooidonk, Maynard et al. (in revision) Downscaling climate model projections of coral bleaching van Hooidonk, Maynard et al. (in revision) The future for coral reefs… ?? Image: http://saveourcoralreefs.org Thank you! Jeffrey Maynard E: [email protected] Ruben van Hooidonk E: [email protected] Acknowledgments: Producing these projections was made possible by a research grant awarded to our team by the Pacific Islands Climate Change Cooperative. This files contents are solely the opinions of the authors and do not constitute statements of policy, decision or position on behalf of NOAA or the U.S. Government. References: Chan, Neil, and Sean R. Connolly. "Sensitivity of coral calcification to ocean acidification: a meta‐analysis." Global change biology 19.1 (2013): 282-290. Hoegh-Guldberg, Ove. "Climate change, coral bleaching and the future of the world's coral reefs." Marine and freshwater research 50.8 (1999): 839-866. van Hooidonk, Ruben, et al. "Opposite latitudinal gradients in projected ocean acidification and bleaching impacts on coral reefs." Global change biology 20.1 (2014): 103-112. van Hooidonk, R., J. A. Maynard, and S. Planes. "Temporary refugia for coral reefs in a warming world." Nature Climate Change 3.5 (2013): 508511.