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Earth System Dynamics An interactive open-access journal of the European Geosciences Union

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doi:10.5194/esd-2017-42
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
19 Apr 2017
Review status
This discussion paper is under review for the journal Earth System Dynamics (ESD).
Community Climate Simulations to assess avoided impacts in 1.5 °C and 2 °C futures
Benjamin M. Sanderson1, Yangyang Xu2, Claudia Tebaldi1, Michael Wehner3, Brian O'Neill1, Alexandra Jahn4, Angeline G. Pendergrass1, Flavio Lehner1, Warren G. Strand1, Lei Lin5, Reto Knutti6,1, and Jean Francois Lamarque1 1National Center for Atmospheric Research, Boulder, CO, USA
2Department of Atmospheric Sciences, Texas A&M University, College Station, TX, USA
3Lawrence Berkeley National Lab, CA, USA
4Department of Atmospheric and Oceanic Sciences and Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, USA
5School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China
6Institute for Atmospheric and Climate Science, ETH, Zurich, Switzerland
Abstract. The Paris Agreement of December 2015 stated a goal to pursue efforts to keep global temperatures below 1.5 °C above pre-industrial levels and well below 2 °C. The IPCC was charged with assessing climate impacts at these temperature levels, but fully coupled equilibrium climate simulations do not currently exist to inform such assessments. In this study, we produce a set of scenarios using a simple model designed to achieve long term 1.5 °C and 2 °C temperatures in a stable climate. These scenarios are then used to produce century scale ensemble simulations using the Community Earth System Model, providing impact-relevant long term climate data for stabilization pathways at 1.5 °C and 2 °C levels and an overshoot 1.5 °C case, which are freely available to the community. Here we describe the design of the simulations and key aspects of their impact-relevant climate response. Exceedance of historical record temperature occurs with 60 percent greater frequency in the 2 °C climate than in a 1.5 °C climate aggregated globally, and with twice the frequency in equatorial and arid regions. Extreme precipitation intensity is statistically significantly higher in a 2.0 °C climate than a 1.5 °C climate in several regions. The model exhibits large differences in the Arctic which is ice-free with a frequency of 1 in 3 years in the 2.0 °C scenario, and only 1 in 40 years in the 1.5 °C scenario.

Citation: Sanderson, B. M., Xu, Y., Tebaldi, C., Wehner, M., O'Neill, B., Jahn, A., Pendergrass, A. G., Lehner, F., Strand, W. G., Lin, L., Knutti, R., and Lamarque, J. F.: Community Climate Simulations to assess avoided impacts in 1.5 °C and 2 °C futures, Earth Syst. Dynam. Discuss., doi:10.5194/esd-2017-42, in review, 2017.
Benjamin M. Sanderson et al.
Benjamin M. Sanderson et al.
Benjamin M. Sanderson et al.

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Short summary
We present the results of a set of climate simulations designed to simulate futures in which the Earth's temperature is stabilized at the levels referred to in the 2015 Paris Agreement. We consider the necessary future emissions reductions and the aspects of extreme weather which differ significantly between the 2 degree and the 1.5 degree climate in the simulations.
We present the results of a set of climate simulations designed to simulate futures in which the...
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