Q. Consider the following statements regarding the Aerosols:
1. Their scattering of sunlight can reduce visibility (haze) and redden sunrises and sunsets.
2. Its concentrations in the atmosphere rise and fall with climate.
Which of the statements given above is/are correct?
Aerosols are minute particles suspended in the atmosphere. When these particles are sufficiently large, we notice their presence as they scatter and absorb sunlight.
- Their scattering of sunlight can reduce visibility (haze) and redden sunrises and sunsets. Aerosols interact both directly and indirectly with the Earth’s radiation budget and climate.
- As a direct effect, the aerosols scatter sunlight directly back into space.
- As an indirect effect, aerosols in the lower atmosphere can modify the size of cloud particles, changing how the clouds reflect and absorb sunlight, thereby affecting the Earth’s energy budget
- Aerosols come from both natural and human sources—and sometimes both at once. Dust, for example, is scoured from deserts, the dried-out edges of rivers, dry lakebeds, and more.
- Its concentrations in the atmosphere rise and fall with climate; in cold, dry, periods in the planet ‘s history like the last ice age, more dust filled the atmosphere than during warmer stretches of Earth ‘s history.