This book is unique in bringing together the diverse concepts and ideas of meteorologists, atmospheric physicists and oceanographers into a single coherent account of the fluid environment, with emphasis on their physical properties and inter-dependence rather than on the mathematics. It provides an up-to-date appreciation of the subject area with reference to major research programmes in Oceanography and Meteorology, and an invaluable combined perspective for undergraduates who tend to compartmentalise themselves. It also shows the way the subject is currently developing and suggests possible future research.