Phenomenon: Every year, millions of tons of mineral dust are swept up from the Sahara Desert in Africa and transported thousands of miles across the Atlantic Ocean by the trade winds. This massive plume of dry, dusty air is known as the Saharan Air Layer (SAL).
Impacts on Earth Systems (Feedbacks):
- Atmosphere (Hurricanes): The extreme dry air and wind shear of the SAL suppress the formation and intensification of tropical cyclones (hurricanes).
- Biosphere (Air Quality): When the dust reaches Puerto Rico and the Caribbean, it drastically reduces air quality (raising the AQI), causing respiratory issues.
- Biosphere (Nutrients): The dust acts as a critical fertilizer, depositing phosphorus and iron into the El Yunque rainforest and marine ecosystems, sustaining biodiversity.
Instructions: Use the sliders to adjust the emission volume from the Sahara, the speed of the trade winds, and the amount of precipitation over the Atlantic. Observe how these factors interact to change the Air Quality Index (AQI) in Puerto Rico and the probability of hurricane formation.