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Nonlinear climate sensitivity and its implications for future greenhouse warming

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Title:Nonlinear climate sensitivity and its implications for future greenhouse warming
Authors:Friedrich, Tobias
Timmermann, Axel
Tigchelaar, Michelle
Timm, Oliver Elison
Ganopolski, Andrey
Keywords:climate change
climate sensitivity
global warming
glacial cycles
greenhouse effect
show 6 morecarbon dioxide
ice age
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Date Issued:09 Nov 2016
Publisher:Science Advances
Abstract:Global mean surface temperatures are rising in response to anthropogenic greenhouse gas emissions. The magnitude of this warming at equilibrium for a given radiative forcing—referred to as specific equilibrium climate sensitivity (S)—is still subject to uncertainties. We estimate global mean temperature variations and S using a 784,000-year-long field reconstruction of sea surface temperatures and a transient paleoclimate model simulation. Our results reveal that S is strongly dependent on the climate background state, with significantly larger values attained during warm phases. Using the Representative Concentration Pathway 8.5 for future greenhouse radiative forcing, we find that the range of paleo-based estimates of Earth’s future warming by 2100 CE overlaps with the upper range of climate simulations conducted as part of the Coupled Model Intercomparison Project Phase 5 (CMIP5). Furthermore, we find that within the 21st century, global mean temperatures will very likely exceed maximum levels reconstructed for the last 784,000 years. On the basis of temperature data from eight glacial cycles, our results provide an independent validation of the magnitude of current CMIP5 warming projections.
Pages/Duration:12 pages
Appears in Collections: Timmermann, Axel
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