Environment & Ecology
Context: Role of Industrial Aerosols in contributing to Global Cooling. A new study reveals that inactive volcanoes contributed 66 percent of sulphate emissions, known to cool the planet, in the preindustrial era.
- Aerosols are defined as a combination of liquid or solid particles suspended in a gaseous or liquid environment.
- In the atmosphere, these particles are mainly situated in the low layers of the atmosphere (< 1.5 km) since aerosol sources are located on the terrestrial surface.
- However, certain aerosols can still be found in the stratosphere, especially volcanic aerosols ejected into the high altitude layers.
- Source of aerosols
- Natural sources – sea salt generated from breaking waves, mineral dust blown from the surface by wind, and volcanoes.
- Anthropogenic aerosols – sulphate, nitrate, and carbonaceous aerosols, and are mainly from fossil fuel combustion sources.
Effects of aerosols:
- They affect the atmospheric chemical composition.
- They can reduce visibility.
- They have important impacts on air quality and human health (e.g. aerosols can cause damage to heart and lungs).
- They serve as nuclei for cloud droplets or ice crystals in ice clouds.
Previous Year Questions
Q.1) Among the following crops, which one is the most important anthropogenic source of both methane and nitrous oxide ?
Q.2) Consider the following:
- Carbon monoxide
- Nitrogen oxide
- Sulphur dioxide
Excess of which of the above in the environment is/are cause(s) of acid rain? (2022)
- 1, 2 and 3
- 2 and 4 only
- 4 only
- 1, 3 and 4
For a dedicated peer group, Motivation & Quick updates, Join our official telegram channel – https://t.me/IASbabaOfficialAccount
Subscribe to our YouTube Channel HERE to watch Explainer Videos, Strategy Sessions, Toppers Talks & many more…