5E: CESM1(WACCM) Stratospheric Aerosol Geoengineering Large Ensemble (GLENS) Project

The Stratospheric Aerosol Geoengineering Large Ensemble project produced the first large ensemble geoengineering dataset using the NCAR Community Earth System Model with the Whole Atmosphere Community Climate Model as its atmospheric component (CESM1(WACCM)), see http://www.cesm.ucar.edu/experiments/cesm1.2/GLE/ for details. Simulations were performed in 2017 on the new NCAR Cheyenne supercomputer, using the Advanced Science Discovery allocations. A comprehensive set of model output has been made available to the community on the NCAR Climate Data Gateway. This enables the community to explore the effects of solar geoengineering on the Earth system based on a multiple ensemble dataset. So far 3 papers have been published using this dataset and several additional papers are in preparation by colleagues at NCAR, US universities, and international universities, including in the UK and the Netherlands. Researchers are looking at various aspects including detection of climate responses, effects on hurricanes, water cycle, aerosols etc. The GLENS data set is further used to for the DECIMALS project (http://www.srmgi.org/decimals-fund/), which is supporting 8 groups from different developing countries to explore the impact of SRM on their regions. GLENS is a joint project between ACOM and CGD.

Sample template image
Figure 1. Figure 1. (top) Global mean surface temperature T0, (middle) the interhemisphere surface temperature gradient T1, and (bottom) the equator-to-pole surface temperature gradient T2 for RCP8.5 (gray for single ensemble members and black for the ensemble mean) and for the geoengineering simulations (light blue for single ensemble members and dark blue for the ensemble mean) as compared to 2015-25 values of the RCP8.5 simulation. Click for larger image.

Project Team:

Simone Tilmes [tilmes@ucar.edu], Jadwiga H. Richter [jrichter@ucar.edu], Michael Mills [mmills@ucar.edu], Ben Kravitz [Ben.Kravitz@pnnl.gov], and Douglas G. MacMartin [macmartin@cornell.edu]


  • Tilmes, S., J.H. Richter, B. Kravitz, D.G. MacMartin, M.J. Mills, I.R. Simpson, A.S. Glanville, J.T. Fasullo, A.S. Phillips, J. Lamarque, J. Tribbia, J. Edwards, S. Mickelson, and S. Gosh, 0: CESM1(WACCM) Stratospheric Aerosol Geoengineering Large Ensemble (GLENS) Project. Bull. Amer. Meteor. Soc., 0 [https://doi.org/10.1175/BAMS-D-17-0267.1]

  • Fasullo, John T. and Tilmes, Simone and Richter, Jadwiga H. and Kravitz, Ben and MacMartin, Douglas G. and Mills, Michael J. and Simpson, Isla R.: 2018, Persistent polar ocean warming in a strategically geoengineered climate, Nature Geoscience, https://www-nature-com.cuucar.idm.oclc.org/articles/s41561-018-0249-7

  • Sasha Madronich, Simone Tilmes, Ben Kravitz, Douglas G. MacMartin and Jadwiga H. Richter, Response of Surface Ultraviolet and Visible Radiation to Stratospheric SO2 Injections, Atmosphere 2018, 9(11), 432; https://doi.org/10.3390/atmos9110432

  • Doug G. MacMartin, Wenli Wang, Ben Kravitz, Simone Tilmes, Jadwiga H. Richter, and Michael J. Mills, Timescale for detecting the climate response to stratospheric aerosol geoengineering, Journal of Geophysical Research, in revision

  • Wei Cheng1, Douglas G. MacMartin1,2, Katherine Dagon3, Ben Kravitz,4 Simone Tilmes3,5, Jadwiga H. Richter3, Michael J. Mills5, Isla R. Simpson, Soil moisture and other hydrological changes in a geoengineering large ensemble, to be submitted to JGR