Dust storms are meteorological events where extremely high winds lift up dust and soil from the ground and transport them over long distances. These kinds of dust storms are quite common in arid and semi-arid regions.
Causes
- Natural Causes: Droughts, arid conditions, low vegetation, and strong pressure gradients.
- Human-Induced Factors: Overgrazing, deforestation, unsustainable farming, and land degradation.
Mechanisms For Formation
- Saltation: The process by which wind lifts particles, which then fall back to the ground, loosening smaller dust particles.
- Suspension: Extremely fine particles are lifted high into the atmosphere and can travel thousands of kilometers.
Geographical Distribution
- Global: The Sahara Desert (source of “Harmattan”), Gobi Desert, and Middle Eastern deserts.
- India: Primarily the Thar Desert region (Rajasthan, Haryana, Punjab). In North India, these are locally known as Andhi or Loo (when accompanied by extreme heat).
Impact
- Environment: Reduce albedo
- Health: Increases respiratory issues (Asthma, Bronchitis) and spreads particulate matter.
- Economy
- Causes soil erosion and crop damage.
- Disrupts aviation, road transport, and solar power generation (by coating panels).
- Green Belts: Planting shelterbelts and windbreaks to reduce wind velocity.
- Soil Moisture Management: Using drip irrigation and mulching to keep soil intact.
- Early Warning Systems: Using satellite data (like INSAT-3DR) for real-time tracking and alerts.
- Global Initiatives: The United Nations Convention to Combat Desertification (UNCCD) works specifically on Sand and Dust Storms (SDS) as part of land degradation neutrality.
Source: The Hindu