The dynamics of flows in density-stratified fluids has been and remains now an important topic for scientific enquiry. Such flows arise in many contexts, ranging from industrial settings to the oceanic and atmospheric environments. It is the latter topic which is the focus of this book. Both the ocean and atmosphere are characterised by the basic vertical density stratification, and this feature can affect the dynamics on all scales ranging from the micro- scale to the planetary scale. The aim of this book is to provide a ¿state-of- the-art¿ account of stratified flows as they are relevant to the ocean and atmosphere with a primary focus