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Area of Science:

  • Climate Science
  • Astrophysics
  • Geoengineering

Background:

  • Anthropogenic climate change necessitates exploring novel mitigation strategies.
  • Solar radiation management (SRM) via space-based sunshades is a proposed geoengineering approach.
  • Previous studies focused on sunshades at the Sun-Earth L1 point.

Purpose of the Study:

  • To investigate active control of Earth's radiative forcing using space-based sunshades.
  • To identify optimal configurations of orbiting occulting disks for climate control.
  • To mitigate both global temperature increases and regional climate disparities.

Main Methods:

  • Utilized a globally resolved energy balance model to simulate climate response.
  • Investigated orbits near the Sun-Earth L1 Lagrange point.
  • Designed forced orbits and analyzed configurations of multiple occulting disks.

Main Results:

  • Identified optimal occulting disk orbits for offsetting global temperature rise.
  • Demonstrated the ability to mitigate latitudinal and seasonal temperature differences.
  • Developed configurations with reduced residual regional temperature variations.

Conclusions:

  • Space-based sunshades offer an efficient method for solar radiation management.
  • Optimized orbital mechanics can enhance the effectiveness of geoengineering solutions.
  • Dual-disk configurations show promise for more equitable climate change mitigation.