Current concern about the stability of our climatic system is reflected in this book, which offers theoretical models of a microclimate and an explanation of the theory of various air-lake interactions as well as providing instructions for convenient numerical parametrizations. Five major subjects are covered - atmospheric planetary boundary layer (PBL), energy transfer at the air-water interface, wind-induced drift of surface films, thermal regime and mixing conditions in lakes and the thermal bar. The author is a Soviet scientist who is often visits western meteorological institutes.