Record temperature streak bears anthropogenic fingerprint

Michael E. Mann, Sonya K. Miller, Stefan Rahmstorf, Byron A. Steinman, Martin Tingley

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We use a previously developed semiempirical approach to assess the likelihood of the sequence of consecutive record-breaking temperatures in 2014–2016. This approach combines information from historical temperature data and state-of-the-art historical climate model simulations from the Coupled Model Intercomparison Project Phase 5 (CMIP5). We find that this sequence of record-breaking temperatures had a negligible (<0.03%) likelihood of occurrence in the absence of anthropogenic warming. It was still a rare but not implausible event (roughly 1–3% likelihood) taking anthropogenic warming into effect. The probability that three consecutive records would have been observed at some point since 2000 is estimated as ~30–50% given anthropogenic warming and <0.7% in its absence. The likelihood of observing the specific level of record warmth recorded during 2016 is no more than ~one-in-a-million neglecting anthropogenic warming, but as high as 27%, i.e., a nearly one-in-three chance of occurrence taking anthropogenic warming into account.

Original languageEnglish (US)
Pages (from-to)7936-7944
Number of pages9
JournalGeophysical Research Letters
Issue number15
StatePublished - Aug 16 2017

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  • global temperature extreme


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