Solar Climate Intervention Techniques
Kartavya Desk Staff
Source: TH
Context: A new study in Earth’s Future journal proposes a low-altitude version of Stratospheric Aerosol Injection (SAI) using modified existing aircraft.
About Solar Climate Intervention Techniques:
• What is Solar Climate Intervention? It refers to geoengineering technologies aimed at reducing incoming solar radiation to counteract global warming effects without cutting greenhouse gas emissions.
• It refers to geoengineering technologies aimed at reducing incoming solar radiation to counteract global warming effects without cutting greenhouse gas emissions.
• Key Types of Techniques:
• Stratospheric Aerosol Injection (SAI): Spraying sulphur dioxide or other particles into the stratosphere to reflect sunlight and cool Earth. Marine Cloud Brightening: Involves spraying sea salt into marine clouds to increase their reflectivity. Space-Based Reflectors: Hypothetical deployment of mirrors or shades in space to block a portion of sunlight. Surface Albedo Modification: Lightening surfaces (like painting roofs white or planting reflective crops) to reflect more sunlight.
• Stratospheric Aerosol Injection (SAI): Spraying sulphur dioxide or other particles into the stratosphere to reflect sunlight and cool Earth.
• Marine Cloud Brightening: Involves spraying sea salt into marine clouds to increase their reflectivity.
• Space-Based Reflectors: Hypothetical deployment of mirrors or shades in space to block a portion of sunlight.
• Surface Albedo Modification: Lightening surfaces (like painting roofs white or planting reflective crops) to reflect more sunlight.
• How Stratospheric Aerosol Injection (SAI) Works?
• Inspired by volcanic eruptions (e.g., Mount Pinatubo, 1991) that cooled global temperatures by emitting aerosols. Sulphur dioxide aerosols are released at high altitudes (~13–20 km) to form a reflective layer. This layer reflects sunlight back into space, reducing global surface temperatures. Duration of particles in the stratosphere: months to years, depending on injection altitude.
• Inspired by volcanic eruptions (e.g., Mount Pinatubo, 1991) that cooled global temperatures by emitting aerosols.
• Sulphur dioxide aerosols are released at high altitudes (~13–20 km) to form a reflective layer.
• This layer reflects sunlight back into space, reducing global surface temperatures.
• Duration of particles in the stratosphere: months to years, depending on injection altitude.
• Significance Of SAI:
• Rapid Cooling: Could lower global temperatures within a year of deployment. Cheaper Alternative: More affordable than decarbonisation strategies. Buys Time: Offers short-term relief while countries scale up renewable energy. Scientific Learning: Opens avenues for microgravity aerosol research, modelling, and international coordination.
• Rapid Cooling: Could lower global temperatures within a year of deployment.
• Cheaper Alternative: More affordable than decarbonisation strategies.
• Buys Time: Offers short-term relief while countries scale up renewable energy.
• Scientific Learning: Opens avenues for microgravity aerosol research, modelling, and international coordination.
• Limitations:
• Global Side Effects: Uneven regional cooling and could disrupt monsoons, rainfall, and crop patterns. Ozone Layer Threat: May delay ozone hole recovery. Acid Rain Risk: Sulphur compounds may lead to acid precipitation. Governance Challenges: Affects all nations but may be initiated unilaterally – creating geopolitical tensions. High Volume Needed at Lower Altitudes: 2–3x more aerosol needed if injected at ~13 km vs 20 km.
• Global Side Effects: Uneven regional cooling and could disrupt monsoons, rainfall, and crop patterns.
• Ozone Layer Threat: May delay ozone hole recovery.
• Acid Rain Risk: Sulphur compounds may lead to acid precipitation.
• Governance Challenges: Affects all nations but may be initiated unilaterally – creating geopolitical tensions.
• High Volume Needed at Lower Altitudes: 2–3x more aerosol needed if injected at ~13 km vs 20 km.