Researchers studied the impact of stratospheric aerosol intervention SAI on mitigating global warming effects over the Mediterranean and MENA (Middle East and North Africa).
About the Study:
- The study examined the effects of global warming on terrestrial water storage (TWS), including all water on the land surface and in the subsurface.
- This was the first attempt to analyze the influence of greenhouse gas emissions and SAI scenarios on both mean and extreme water storage changes compared to historical conditions from 1985–2014.
Key Findings of the Study:
- The MENA region, one of the most water-stressed globally, will experience a decrease in TWS around the wetter areas of the Caspian and Mediterranean seas but an increase over most of the MENA region.
- By the end of the decade, water availability in MENA may drop below 500 cubic meters per person per year, indicating severe water scarcity.
- By 2050, MENA will need an additional 25 billion cubic meters of water annually to meet demands.
- The Mediterranean region is expected to face significant water availability reductions due to decreased rainfall and increased demand for irrigation by the twenty-first century’s end.
- SAI can reduce changes in extreme water storage due to global warming; it increases mean TWS compared to scenarios with only greenhouse gas emissions.
- Global warming decreases TWS extremes overall, except in the Arabian Peninsula and western North Africa.
- SAI partly mitigates substantial reductions in extreme TWS, especially around the Caspian Sea and Mediterranean.
- Despite SAI’s effects, the Arabian Peninsula is expected to experience significant increases in extreme water storage in the future.
About Stratospheric Aerosol Intervention (SAI):
- SAI, also known as Stratospheric Aerosol Injection, is a form of geoengineering aiming to cool the Earth by reflecting sunlight away.
- It introduces tiny reflective particles, or aerosols, into the stratosphere to mimic the cooling effects of volcanic eruptions.
- The concept was inspired by the 1991 eruption of Mount Pinatubo, which significantly lowered global temperatures.
- This method could potentially scatter more radiation in the stratosphere, reducing warming in the troposphere below.
- Techniques for introducing aerosols include using cannons, balloons, or aircraft.
- While it could rapidly counter temperature and precipitation changes at a low direct cost, it could also have imperfect and diverse effects, particularly if misused.
About Aerosols:
- Aerosols are tiny particles, either solid or liquid, suspended in the air or another gas.
- They can be natural, like fog or volcanic emissions, or artificial, like smoke from burning fuels.
- These particles can be primary (emitted directly into the atmosphere) or secondary (formed from other gases).
- Despite their small size, aerosols are numerous and can consist of many different substances.
- They play a significant role in the atmosphere, visible as smoke, smog, haze, or dust.
About Stratosphere:
- The stratosphere is the layer of the Earth’s atmosphere above the troposphere and below the mesosphere.
- It extends from the tropopause at approximately 10 to 17 km altitude to the stratopause at about 50 km.
- Characterized by stable temperature gradients and containing the ozone layer, which absorbs UV radiation, increasing temperature with altitude.
- Commercial jets fly in the lower parts to avoid turbulence and drag common in the troposphere.
- It holds a small amount of the atmosphere’s total gas volume and very little water vapor.
- The stratosphere varies in height based on location: higher at the equator and lower at the poles.
- Seasonal and geographic temperature variations occur, with particularly low temperatures during the polar night.
Location of Caspian:
- The Caspian Sea is the world’s largest inland body of water, classified as neither a sea nor a lake but a unique natural formation.
- It is an endorheic basin, meaning it has no natural outlets and retains its water.
- It lies between Europe and Asia, bordered by five countries:
- Russia and Kazakhstan to the north,
- Turkmenistan to the south, and
- Iran and Azerbaijan to the west.
- The Volga River, which is the longest river in Europe, provides the majority of the Caspian Sea’s freshwater inflow.
Location of Mediterranean Sea:
- The Mediterranean Sea is located between Europe, Africa, and Asia.
- It is connected to the Atlantic Ocean by the Strait of Gibraltar in the west.
- To the northeast, it is connected to the Sea of Marmara and the Black Sea by the Dardanelles Strait and the Bosporus Strait.
- It borders Southern Europe and the Balkans to the north, North Africa to the south, and the Eastern Mediterranean to the east.
- The countries bordering the Mediterranean Sea include Spain, France, Monaco, Italy, Slovenia, Croatia, Bosnia and Herzegovina, Montenegro, Albania, Greece, Turkey, Syria, Lebanon, Israel, Egypt, Libya, Tunisia, Algeria, and Morocco.
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