Record temperature streak bears anthropogenic fingerprint

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Abstract

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.

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Mann, M. E., Miller, S. K., Rahmstorf, S., Steinman, B. A., & Tingley, M. (2017). Record temperature streak bears anthropogenic fingerprint. Geophysical Research Letters, 44(15), 7936–7944. https://doi.org/10.1002/2017GL074056

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