Pervasive cirrus clouds around the globe are known to play a key role in the Earth's radiation budget, yet there are still many open questions concerning the life cycle and microphysical properties of these clouds. Cirrus dynamics have been observed to vary by a variety of influences, including origination mechanism, air mass origin, convection, and gravity waves. Aerosol indirect effects on cirrus clouds have also been investigated based on laboratory experiments, field measurements, remote sensing observations, and model simulations, showing that aerosol concentration, size, and composition all play an important role. These variables can affect the size, concentration, and ice habits of cirrus clouds, which affect their radiative properties. With improvements in in situ microphysical instrumentation and remote sensing retrievals over the years, more recent field studies have been able to provide improved estimates of these microphysical properties, but there are still active investigations concerning how best to represent these clouds and their interactions with aerosols in global climate models. We welcome analysis of field campaigns, modeling studies, and insights from remote sensing retrievals. We especially welcome interdisciplinary investigations looking at cloud processes, aerosol indirect effects, viable parameterizations, and radiative impacts.

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