Tropospheric aerosols have a _____ effect at the surface and can lead to _____ in the troposphere.

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Multiple Choice

Tropospheric aerosols have a _____ effect at the surface and can lead to _____ in the troposphere.

Explanation:
Aerosols influence radiation in two opposing ways. Particles that scatter sunlight, like sulfate aerosols, reflect solar energy back to space, which reduces the amount reaching the surface and cools it. Other aerosols, such as black carbon, absorb sunlight and heat the air around them, warming the troposphere. So you get surface cooling from the reflective components while the troposphere warms from the absorbing components. That combination explains why the surface is cooled while the troposphere can warm. The other patterns—surface warming or cooling in both layers—don’t match the typical actions of these aerosol types.

Aerosols influence radiation in two opposing ways. Particles that scatter sunlight, like sulfate aerosols, reflect solar energy back to space, which reduces the amount reaching the surface and cools it. Other aerosols, such as black carbon, absorb sunlight and heat the air around them, warming the troposphere. So you get surface cooling from the reflective components while the troposphere warms from the absorbing components. That combination explains why the surface is cooled while the troposphere can warm. The other patterns—surface warming or cooling in both layers—don’t match the typical actions of these aerosol types.

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