In 1991, Mt. Pinatubo in the Philippines erupted. Volcano propelled ash and debris high into the atmosphere.

What meteorological impact could these aerosols have on the global weather and climate?

The volcano injected some 15 billion tons of sulfur dioxide into the stratosphere. There it reacted with water to form a layer of aerosol particles, which are primarily sulfuric acid droplets. Winds have take those aerosol particles all around the world. The stratosphere lacks rain clouds as a mechanism to wash out pollutants fast. This heavy influx of aerosol pollutants will remain in the stratosphere for years until natural chemical reactions and atmospheric circulation can filter them out.