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Keith DW, Weisenstein DK, Dykema JA, et al. Stratospheric solar geoengineering without ozone loss. Proc Natl Acad Sci U S A. 2016;113(52):14910-14914doi: 10.1073/pnas.1615572113.
Keith, D. W., Weisenstein, D. K., Dykema, J. A., & Keutsch, F. N. (2016). Stratospheric solar geoengineering without ozone loss. Proceedings of the National Academy of Sciences of the United States of America, 113(52), 14910-14914. https://doi.org/10.1073/pnas.1615572113
Keith, David W, et al. "Stratospheric solar geoengineering without ozone loss." Proceedings of the National Academy of Sciences of the United States of America vol. 113,52 (2016): 14910-14914. doi: https://doi.org/10.1073/pnas.1615572113
Keith DW, Weisenstein DK, Dykema JA, Keutsch FN. Stratospheric solar geoengineering without ozone loss. Proc Natl Acad Sci U S A. 2016 Dec 27;113(52):14910-14914. doi: 10.1073/pnas.1615572113. Epub 2016 Dec 12. PMID: 27956628; PMCID: PMC5206531.
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Proc Natl Acad Sci U S A. 2016 Dec 27;113(52):14910-14914. doi: 10.1073/pnas.1615572113. Epub 2016 Dec 12.

Stratospheric solar geoengineering without ozone loss.

Proceedings of the National Academy of Sciences of the United States of America

David W Keith, Debra K Weisenstein, John A Dykema, Frank N Keutsch

Affiliations

  1. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138; [email protected].
  2. John F. Kennedy School of Government, Harvard University, Cambridge, MA 02138.
  3. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138.
  4. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138.

PMID: 27956628 PMCID: PMC5206531 DOI: 10.1073/pnas.1615572113

Abstract

Injecting sulfate aerosol into the stratosphere, the most frequently analyzed proposal for solar geoengineering, may reduce some climate risks, but it would also entail new risks, including ozone loss and heating of the lower tropical stratosphere, which, in turn, would increase water vapor concentration causing additional ozone loss and surface warming. We propose a method for stratospheric aerosol climate modification that uses a solid aerosol composed of alkaline metal salts that will convert hydrogen halides and nitric and sulfuric acids into stable salts to enable stratospheric geoengineering while reducing or reversing ozone depletion. Rather than minimizing reactive effects by reducing surface area using high refractive index materials, this method tailors the chemical reactivity. Specifically, we calculate that injection of calcite (CaCO

Keywords: atmospheric chemistry; climate change; climate engineering; geoengineering; stratospheric ozone

Conflict of interest statement

The authors declare no conflict of interest.

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