Consider the following which can be found in the ambient atmosphere:
- Soot
- Sulphur hexafluoride
- Water vapour
Which of the above contribute to the warming up of the atmosphere?
- 1 and 2 only
- 3 only
- 2 and 3 only
- 1, 2 and 3
Explanation
All options are correct
- Soot (Black Carbon): This is a light-absorbing particulate matter rather than a gas. It contributes to warming in two primary ways:
- Direct Warming: Suspended soot particles absorb solar energy (sunlight) and infrared radiation, directly heating the surrounding air.
- Albedo Effect: When soot is deposited on snow and ice, it darkens the surface, reducing its reflectivity (albedo) and accelerating the melting process.
- Sulphur Hexafluoride (SF6): This is an anthropogenic (man-made) synthetic gas that is extremely potent and long-lived. It has a Global Warming Potential (GWP) approximately 23,500 times greater than carbon dioxide (CO2) over a 100-year period. It is primarily used in the electrical power industry as an insulator in high-voltage equipment.
- Water Vapour: It is the most abundant greenhouse gas in the atmosphere and a major contributor to the natural greenhouse effect. It acts as a powerful warming feedback mechanism; as other greenhouse gases like (CO2) warm the planet, the atmosphere’s capacity to hold water vapour increases, which in turn traps more heat and further amplifies the warming effect.
