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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Stratospheric solar geoengineering without ozone loss.

David W Keith1,2, Debra K Weisenstein3, John A Dykema3

  • 1John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138; david_keith@harvard.edu.

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This study proposes using solid calcite aerosols for stratospheric geoengineering. This method may reduce climate risks and ozone depletion, unlike sulfate aerosols.

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atmospheric chemistryclimate changeclimate engineeringgeoengineeringstratospheric ozone

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Area of Science:

  • Atmospheric Chemistry
  • Climate Science
  • Geoengineering

Background:

  • Solar geoengineering, particularly stratospheric sulfate aerosol injection, is proposed to mitigate climate risks.
  • However, sulfate aerosols pose risks such as ozone depletion and stratospheric heating, which can exacerbate ozone loss and warming.

Purpose of the Study:

  • To propose and evaluate a novel stratospheric aerosol climate modification method.
  • To address the risks associated with traditional solar geoengineering approaches, specifically ozone depletion.

Main Methods:

  • Investigated a solid aerosol composed of alkaline metal salts, specifically calcite (CaCO3).
  • Calculated the potential radiative forcing and impact on column ozone and stratospheric heating.
  • Compared the effects of calcite aerosols with sulfate aerosols.

Main Results:

  • Calcite aerosol injection can reduce net radiative forcing while increasing column ozone towards pre-industrial levels.
  • A radiative forcing of -1 W⋅m⁻² could be achieved with a 3.8% increase in column ozone using 2.1 Tg⋅y⁻¹ of calcite aerosol.
  • Stratospheric radiative heating is approximately 10-fold less than with sulfate aerosols for the same radiative forcing.

Conclusions:

  • Stratospheric geoengineering using calcite aerosols offers a method to reduce climate risks and ozone depletion simultaneously.
  • This approach could supplement emissions cuts by mitigating climate change risks.
  • Further research is needed to improve the efficacy and safety of this geoengineering method.