Investigating differences between event-as-class and probability density-based attribution statements with emerging climate change
There is significant public and scientific interest in understanding whether and to what extent the severity and frequency of extreme events have increased in response to human influences on the climate system. As the science underpinning the field of event attribution continues to rapidly develop, there are growing expectations of faster and more accurate attribution statements to be delivered, even in the days to weeks after an extreme event occurs. As the research community looks to respond, a variety of approaches have been suggested, each with varying levels of conditioning to the observed state of the climate when the event of interest has occurred. One such approach to utilise unconditioned multi-model ensembles requires pre-computing estimates of the change in probability of occurrence for a wide range of possible ‘events’. In this study, we consider differences between event-as-class attribution statements with changes in the probability density of the distribution at the event threshold of interest. For the majority of extreme event attribution studies, it is likely that the two metrics are comparable once uncertainty estimates are considered. However, results show these two metrics can produce divergent answers from each other for moderate climatological anomalies if the present-day climate distribution experiences a substantial change in the underlying signal-to-noise ratio. As the emergent signals of climate change becomes increasingly clear, this study highlights the need for clear and explicit framing in the context of applying pre-computed attribution statements, particularly if attribution perspectives are to be included within the framework of future climate services.
- Black MT, Karoly DJ, Rosier SM, et al (2016) The weather@home regional climate modelling project for Australia and New Zealand. Geosci Model Dev Discuss 1–28. doi: 10.5194/gmd-2016-100
- Christidis N, Stott PA, Zwiers FW (2015) Fast-track attribution assessments based on pre-computed estimates of changes in the odds of warm extremes. Clim Dyn 45:1547–1564. doi:10.1007/s00382-014-2408-x
- King AD, Black MT, Min S-K, et al (2016) Emergence of heat extremes attributable to anthropogenic influences. Geophys Res Lett 2015GL067448. doi:10.1002/2015GL067448
- National Academies of Sciences, Engineering, and Medicine, Committee on Extreme Weather Events and Climate Change Attribution, Board on Atmospheric Sciences and Climate, Division on Earth and Life Studies (2016) Attribution of extreme weather events in the context of climate change. National Academies Press, Washington, D.CGoogle Scholar