Coral bleaching under unconventional scenarios of climate warming and ocean acidification

Kwiatkowski, Lester, Cox, Peter, Halloran, Paul R., Mumby, Peter J. and Wiltshire, Andy J. (2015) Coral bleaching under unconventional scenarios of climate warming and ocean acidification. Nature Climate Change, 5 8: 777-781. doi:10.1038/nclimate2655


Author Kwiatkowski, Lester
Cox, Peter
Halloran, Paul R.
Mumby, Peter J.
Wiltshire, Andy J.
Title Coral bleaching under unconventional scenarios of climate warming and ocean acidification
Journal name Nature Climate Change   Check publisher's open access policy
ISSN 1758-6798
1758-678X
Publication date 2015-07-24
Year available 2015
Sub-type Article (original research)
DOI 10.1038/nclimate2655
Open Access Status Not Open Access
Volume 5
Issue 8
Start page 777
End page 781
Total pages 5
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2016
Language eng
Formatted abstract
Elevated sea surface temperatures have been shown to cause mass coral bleaching1, 2, 3. Widespread bleaching, affecting >90% of global coral reefs and causing coral degradation, has been projected to occur by 2050 under all climate forcing pathways adopted by the IPCC for use within the Fifth Assessment Report4, 5. These pathways include an extremely ambitious pathway aimed to limit global mean temperature rise to 2 °C (ref. 6; Representative Concentration Pathway 2.6—RCP2.6), which assumes full participation in emissions reductions by all countries, and even the possibility of negative emissions7. The conclusions drawn from this body of work, which applied widely used algorithms to estimate coral bleaching8, are that we must either accept that the loss of a large percentage of the world’s coral reefs is inevitable, or consider technological solutions to buy those reefs time until atmospheric CO2 concentrations can be reduced. Here we analyse the potential for geoengineering, through stratospheric aerosol-based solar radiation management (SRM), to reduce the extent of global coral bleaching relative to ambitious climate mitigation. Exploring the common criticism of geoengineering—that ocean acidification and its impacts will continue unabated—we focus on the sensitivity of results to the aragonite saturation state dependence of bleaching. We do not, however, address the additional detrimental impacts of ocean acidification on processes such as coral calcification9, 10 that will further determine the benefit to corals of any SRM-based scenario. Despite the sensitivity of thermal bleaching thresholds to ocean acidification being uncertain11, 12, stabilizing radiative forcing at 2020 levels through SRM reduces the risk of global bleaching relative to RCP2.6 under all acidification–bleaching relationships analysed.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Biological Sciences Publications
 
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