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CESM1(WACCM) Stratospheric Aerosol Geoengineering Large Ensemble Project

Tilmes, Simone and Richter, Jadwiga H. and Kravitz, Ben and MacMartin, Douglas G. and Mills, Michael J. and Simpson, Isla R. and Glanville, Anne S. and Fasullo, John T. and Phillips, Adam S. and Lamarque, Jean-Francois and Tribbia, Joseph and Edwards, Jim and Mickelson, Sheri and Ghosh, Siddhartha (2018) CESM1(WACCM) Stratospheric Aerosol Geoengineering Large Ensemble Project. Bulletin of the American Meteorological Society, 99 (11). pp. 2361-2371. ISSN 0003-0007. doi:10.1175/bams-d-17-0267.1.

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This paper describes the Stratospheric Aerosol Geoengineering Large Ensemble (GLENS) project, which promotes the use of a unique model dataset, performed with the Community Earth System Model, with the Whole Atmosphere Community Climate Model as its atmospheric component [CESM1(WACCM)], to investigate global and regional impacts of geoengineering. The performed simulations were designed to achieve multiple simultaneous climate goals, by strategically placing sulfur injections at four different locations in the stratosphere, unlike many earlier studies that targeted globally averaged surface temperature by placing injections in regions at or around the equator. This advanced approach reduces some of the previously found adverse effects of stratospheric aerosol geoengineering, including uneven cooling between the poles and the equator and shifts in tropical precipitation. The 20-member ensemble increases the ability to distinguish between forced changes and changes due to climate variability in global and regional climate variables in the coupled atmosphere, land, sea ice, and ocean system. We invite the broader community to perform in-depth analyses of climate-related impacts and to identify processes that lead to changes in the climate system as the result of a strategic application of stratospheric aerosol geoengineering.

Item Type:Article
Related URLs:
URLURL TypeDescription
Tilmes, Simone0000-0002-6557-3569
Richter, Jadwiga H.0000-0001-7048-0781
Kravitz, Ben0000-0001-6318-1150
MacMartin, Douglas G.0000-0003-1987-9417
Mills, Michael J.0000-0002-8054-1346
Simpson, Isla R.0000-0002-2915-1377
Fasullo, John T.0000-0003-1216-892X
Lamarque, Jean-Francois0000-0002-4225-5074
Tribbia, Joseph0000-0003-1639-9688
Additional Information:© 2018 American Meteorological Society. Final Form: 1 May 2018; Published Online: 12 December 2018. We thank Gary Strand and Ilana Stern, for publishing the model output on the NCAR Earth System Grid, and Alice Bertini, for offering software support in producing diagnostics for model results. The Pacific Northwest National Laboratory is operated for the U.S. Department of Energy by Battelle Memorial Institute under contract DE-AC05-76RL01830. Jean-Francois Lamarque’s participation was supported in part by NSF Award 1243107. The CESM project is supported by the National Science Foundation and the Office of Science (BER) of the U.S. Department of Energy. The National Center for Atmospheric Research is funded by the National Science Foundation. This research was developed with funding from the Defense Advanced Research Projects Agency (DARPA). The views, opinions, and/or findings expressed are those of the authors and should not be interpreted as representing the official views or policies of the Department of Defense or the U.S. government. All simulations were carried out on the Cheyenne high-performance computing platform ( and are available to the community via the Earth System Grid (see information at
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC05-76RL01830
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Issue or Number:11
Record Number:CaltechAUTHORS:20190110-073837914
Persistent URL:
Official Citation: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. Ghosh, 2018: CESM1(WACCM) Stratospheric Aerosol Geoengineering Large Ensemble Project. Bull. Amer. Meteor. Soc., 99, 2361–2371,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92188
Deposited By: Tony Diaz
Deposited On:10 Jan 2019 20:36
Last Modified:16 Nov 2021 03:47

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