BRACE 1.5 Project: Climate Change Impacts of 1.5°C and 2°C Warming
In 2015, 195 countries negotiated the Paris Agreement on climate change, which set long-term goals of limiting global mean warming to well below 2°C, and possibly 1.5°C. Sanderson et al. (2017) recently completed the first set of global climate model simulations with NCAR's Community Earth System Model (CESM) explicitly designed to meet those targets for use by the research community. The Benefits of Reduced Anthropogenic Climate changE (BRACE) 1.5 project builds on the recently completed original BRACE project, which examined the difference in impacts between two higher scenarios resulting in about 2.5°C and 3.7°C warming by late this century.
BRACE 1.5 aims to analyze impacts at 1.5°C and 2°C warming, to understand whether impacts differ substantially between the two climate scenarios. Approaches include direct analysis of differences in physical climate outcomes, assessment of methods for emulating 1.5°C and 2°C climate scenarios,economic analysis of agricultural impacts, both a process-based and an empirical crop model, a model of spatial population change, and models of potential health impacts. Results will help inform the ongoing Intergovernmental Panel on Climate Change (IPCC) Special Report on impacts of 1.5°C warming, as well as the larger scientific literature on the impacts of low warming scenarios.
Special collection on Climate Change Impacts of 1.5°C and 2°C Warming
A special collection on "Climate Change Impacts of 1.5°C and 2°C Warming" is in progress for the journal Environmental Research Letters. Papers for the collection include:
Many of the BRACE 1.5 papers draw on climate model simulations documented in: Sanderson B.M., Xu Y., Tebaldi C., Wehner M., O'Neill B.C., Jahn A., Pendergrass A.G., Lehner F., Strand W.G., Lin L., Knutti R., and Lamarque J.F., 2017. Community climate simulations to assess avoided impacts in 1.5 and 2°C futures. Earth System Dynamics, 8, 827-847. DOI: 10.5194/esd-8-827-2017.
A related paper was also published in Geophysical Research Letters: Lehner F., Coats S., Stocker T.F., Pendergrass A.G., Sanderson B.M., Raible C.C., Smerdon J.E. 2017. Projected drought risk in 1.5°C and 2°C warmer climates. Geophysical Research Letters, 44, 7419–7428. DOI: 10.1002/2017GL074117.