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1 Atlantic Oceanographic and Meteorological Laboratory 2 CRIOBE - Centre de recherches insulaires et observatoire de l-environnement 3 United Nations Environment Programme 4 Ecosystems and Oceanography Program 5 World Wildlife Fund 6 Marine Laboratory 7 School of Ocean Sciences 8 Marine Geophysical Laboratory 9 LabEX CORAIL - Laboratoire d-Excellence CORAIL

Abstract : Increasingly frequent severe coral bleaching is among the greatest threats to coral reefs posed by climate change. Global climate models GCMs project great spatial variation in the timing of annual severe bleaching ASB conditions; a point at which reefs are certain to change and recovery will be limited. However, previous model-resolution projections ~1 × 1° are too coarse to inform conservation planning. To meet the need for higher-resolution projections, we generated statistically downscaled projections 4-km resolution for all coral reefs; these projections reveal high local-scale variation in ASB. Timing of ASB varies >10 years in 71 of the 87 countries and territories with >500 km 2 of reef area. Emissions scenario RCP4.5 represents lower emissions mid-century than will eventuate if pledges made following the 2015 Paris Climate Change Conference COP21 become reality. These pledges do little to provide reefs with more time to adapt and acclimate prior to severe bleaching conditions occurring annually. RCP4.5 adds 11 years to the global average ASB timing when compared to RCP8.5; however, >75% of reefs still experience ASB before 2070 under RCP4.5. Coral reef futures clearly vary greatly among and within countries, indicating the projections warrant consideration in most reef areas during conservation and management planning.

Keywords : coral reefs conservation Climate change Paris agreement C0P21

Autor: Ruben Van Hooidonk - Jeffrey Maynard - Jerker Tamelander - Jamison Gove - Gabby Ahmadia - Laurie Raymundo - Gareth Williams - Sco

Fuente: https://hal.archives-ouvertes.fr/


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