Notes |
Abstract:
Anthropogenic aerosols are intricately linked to the climate system and to the hydrologic cycle. The net effect
of aerosols is to cool the climate system by reflecting sunlight. Depending on their composition, aerosols can
also absorb sunlight in the atmosphere, further cooling the surface but warming the atmosphere in the
process. These effects of aerosols on the temperature profile, along with the role of aerosols as cloud
condensation nuclei, impact the hydrologic cycle, through changes in cloud cover, cloud properties and
precipitation. Unravelling these feedbacks is particularly difficult because aerosols take a multitude of shapes
and forms, ranging from desert dust to urban pollution, and because aerosol concentrations vary strongly
over time and space. To accurately study aerosol distribution and composition therefore requires continuous
observations from satellites, networks of ground-based instruments and dedicated field experiments.
Increases in aerosol concentration and changes in their composition, driven by industrialization and an
expanding population, may adversely affect the Earth’s climate and water supply. |
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