Clouds in the Perturbed Climate System : Their Relationship to Energy Balance, Atmospheric Dynamics, and Precipitation.

Forum held June 2-7, 2008 in Frankfurt, Germany.

Includes bibliographical references and indexes.

More than half the globe is covered by visible clouds. Clouds control major parts of the Earth’s energy balance, influencing both incoming shortwave solar radiation and outgoing longwave thermal radiation. Latent heating and cooling related to cloud processes modify atmospheric circulation, and, by modulating sea surface temperatures, clouds affect the oceanic circulation. They are also an essential component of the global water cycle, on which all terrestrial life depends. Yet clouds constitute the most poorly quantified, least understood, and most puzzling aspect of atmospheric science, and thus the largest source of uncertainty in the prediction of climate change. Because they are influenced by climate change, and because complex, unidentified feedback systems are involved, science is faced with many unanswered questions. This book begins by identifying and describing the baffling nature of clouds. It explores the boundaries of current knowledge on the spatial/temporal variability of clouds and cloud-related aerosols, as well as the factors that control clouds, and examines the extent and nature of anthropogenic perturbations. Particular emphasis is placed on the connections of clouds to climate through radiation, dynamics, precipitation, and chemistry, and on the difficulties in understanding the obvious but elusive fact that clouds must be affected by climate change. The book offers recommendations to improve the current state of knowledge and to direct future research in fields ranging from chemistry and theoretical physics to climate modeling and remote satellite sensing.

ASLI Choice Award