title: Field experiments on solar geoengineering: report of a workshop exploring a representative research portfolio.
abstract: We summarize a portfolio of possible field experiments on solar radiation management (SRM) and related technologies. The portfolio is intended to support analysis of potential field research related to SRM including discussions about the overall merit and risk of such research as well as mechanisms for governing such research and assessments of observational needs. The proposals were generated with contributions from leading researchers at a workshop held in March 2014 at which the proposals were critically reviewed. The proposed research dealt with three major classes of SRM proposals: marine cloud brightening, stratospheric aerosols and cirrus cloud manipulation. The proposals are summarized here along with an analysis exploring variables such as space and time scale, risk and radiative forcing. Possible gaps, biases and cross-cutting considerations are discussed. Finally, suggestions for plausible next steps in the development of a systematic research programme are presented.
authors.affiliation: School of Engineering and Applied Science and Kennedy School of Government, Harvard University, Pierce Hall, 29 Oxford Street, Cambridge, MA 02138, USA david_keith@harvard.edu.
authors.forename: David W
authors.initials: DW
authors.lastname: Keith
authors.affiliation: Jet Propulsion Laboratory, California Institute of Technology, Earth Science and Technology Directorate, 4800 Oak Grove Drive, Pasadena, CA 91109, USA.
authors.forename: Riley
authors.initials: R
authors.lastname: Duren
authors.affiliation: Department of Computing and Mathematical Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.
authors.forename: Douglas G
authors.identifier: http://orcid.org/0000-0003-1987-9417
authors.initials: DG
authors.lastname: MacMartin
keywords: experiment; solar geoengineering; solar radiation management